Gen-II Secondary Air Injection Bypass Module - 2007-2021 Tundra 5.7L- Hewitt Technologies

[@markgardner8542]

Long story short... I was on a 5300 mile trip and 800 miles in Im stuck in New Mexico with a harley in bed of truck and a camp trailer in tow... Limp in mode on hwy with 80 mph speed limit and Im in limp in mode! After limping to Rio Rancho NM this great company was able to next day air ship this to me so I could put it on in a parking lot! SAVED MY ENTIRE TRIP!!!! I cant thank you all enough! After install no more light issues and I was able to drive like a mad man to catch up with my trip! WELL DONE MY FRIENDS!

[@Hewitt-tech]

@markgardner8542 This makes our heart sing! I am glad you found Hewitt Technologies and were able to deliver in a time of need. If there is anything else we can assist with please do not hesitate to contact us. We could also greatly appreciate if you could share this review on our google business page. g.page/r/CYkk2OeC9CgvEAg/review

[@Pats_Monster]

I CANNOT recommend Hewitt ENOUGH!!!! After my check engine light came on and my 2011 Tundra and it went into limp mode I was PISSED! The truck has NEVER been repaired and the 1st problem is EMISSIONS! Even better when the dealer quoted OVER $3K! I ordered the Gen 2 module and harness, installed it, but still dead. I contacted Hewitt and they suggested ordering the sensors. installed still DEAD!!! Now I'm really losing it! I talked to a tech at Hewitt and he helped me diagnose a BROKEN wire on one of my connectors....Ordered a new connector and pigtail and BOOM! Up and RUNNING!!!! They allowed me to return the sensors and in my OPINION have shown what AMERICAN COMPANIES Customer Service SHOULD BE!!!!!! THANK YOU SO MUCH!!!

[@Hewitt-tech]

Thank you for taking the time to leave your feedback and I am glad we were able to help get you back up and running. It can be frustrating when things don't work like they should and your situation is a perfect example of this. We are grateful to have customers that are patient and willing to follow our process of troubleshooting so that we can identify the exact problem(s) and get you back on the road again and enjoying your Toyota/Lexus again!

[@botts1tl]

I just did this on my 2010 4.6 Tundra. The kit arrived a day early and the instructions were phenomenal. Took me about 90 minutes with harness and block off plates. I wish all businesses put this much detail and energy in their products. Thank you.

[@Hewitt-tech]

Tommy, thank you very much for taking the time to leave your feedback... we are constantly looking for ways to improve.

[@rodoaguilar4804]

Can I ask what did your truck do? Before you installed the kit?

[@rodoaguilar4804]

@@Hewitt-tech hello sir my truck having some problems a guy told me to get these kit will It work?

[@Hewitt-tech]

@@rodoaguilar4804 Please contact us directly with your trouble codes. You can give us a call toll free during our normal phone hours 8AM-5PM EST 1-844-307-7671 or send an email to [e-mail] and we would be glad to see if we can help.

[@tombell8592]

@@Hewitt-tech I have a 2012 toyota tundra 4.6 v8 I have a c1201 code and a p0419 code

[@meanmachine6480]

Best customer service EVER!! I got one for my 2008 4runner. It works perfect. A month after I installed it my car threw another code and I thought it had gone bad. I call Hewitt and they diagnosed the codes over the phone. The technician said it was probably my gas cap. I looked at my gas cap and sure enough my gas cap was loose. I tightened my cap and all is well. Saved me a trip to the auto shop!!

[@Hewitt-tech]

Hewitt is here to help! Glad we were able to add value in the troubleshooting process and if there is anything else we can assist with please do not hesitate to contact us.

[@luisbravo5823]

How can I talk to him I changed my pumps and now the random misfire is worse than before

[@christopherseiler5238]

Installed my Gen 2 kit yesterday on my wife's 2012 Tundra. What a lifesaver it is. I was not going to pay $3000 plus for a system that I'm sure would have just gone out again. Thank you Hewitt Tech for the great product, and for also answering the phone when I called. The person I spoke with was outstanding and very knowledgeable about the product.

[@Hewitt-tech]

Thank you for taking the time to leave your comment and feedback!

[@joeybuckles8404]

Had to install a bypass about two years ago and it’s still working like a champ. Hewitt Tech saved me tons of money to fix a known problem that Toyota half ass handled.

[@satzawesome]

Did this on my 2008 , the support was top notch. I am a long armed tall human so i had to improvise to get to the passenger side clip after trying the whole lay on top the engine. took a few hours to figure out. If you do not have a young small young person to do the passenger clip. So the 10mm bolt holding a small harness on top of the intake manifold once you remove it you can see the clip. to get to it the easiest way was to unclip the main harness from body on the passenger side, then there is a 2nd clip that is holding onto the engine via a 10mm bold. Once both are removed . You can push the harness around and reach the clip from the passanger side with no issue. I used small nose plier to push the tab down and pull. The harness clips are one one where you stick your small flat head screw driver and just pull. they are strong and they will clip back. Even if not its not a big issue, the 2nd clip is held in place with a 10mm which is easier to remove the bolt then removing the harness. Might help someone as this if know would take you 10 minutes to do the passenger side. the driver side is easy. The block off bolts were completely rusted so ended up getting a pdf from heweitt with some solution that i gave to my mechanic who charged me 100$ to get this done, If our pump is stuck open then this is needed to clear the error. Put 1000 miles in the July 4th weekend and got 2 mpg more than usual and it runs with alot pep. Smooth. Being a 2008 mine is out of the age for emission . i also got some gas smell in the cab which has disappeared

[@jwilkins29111]

Ordered the kit for my 2012 Toyota Tundra, 4.6. The product arrived on time and was easy to install. I had to make several calls for tech support. The support was awesome! I can't express how responsive, patience and knowledgeable the support staff is. Derek was the technician who assisted me. Derek was awesome and provided amazing support. I and my Tundra are grateful for Hewitt and Derek. We are "On the Road Again." Thanks guys.

[@Hewitt-tech]

It is comments like these that make Monday Mornings worth it. Hewitt is truly here to help and take pride in our customer service. Glad we were able to get you back on the road and really appreciate you sharing your experience. If there is anything thing else we can assist with please do not hesitate to contact us.

[@hanselfernandez2116]

These guys are the real deal, this kit works 100% love the OEM look. And the kit now comes with the plastic caps for the 2 plugs that are no longer needed.

[@risinbison1106]

Just installed this, worked just like it should, no codes and I did have to call their tech line and they were awesome. Getting that passenger clip off though……wow. I’t took me about 4 hours just for the clip, threw every tool I had at it and finally got it with two long flathead screwdrivers. Saved me a couple grand though and it runs so smooth now. 2007 5.7l.

[@jackorth4619]

After going to two different mechanics because I got a PO419 code in my 2010 4.6L Tundra and was told by both I needed 2 new air pumps from Toyota only! I started researching alternatives. I found Hewitt-tech Gen-2 bypass a cheaper solution. I’m 79 years old and the biggest problem I had installing was separating the electrical connections. I thought putting the block off plates between the ASV and the air tubes was going to be difficult but once I found the bolts to remove from the air tube brackets and gently with a 10mm wrench loosened the flange bolts I was able to breath! Everything else was easy and once I tidied up with zip ties reconnected the negative cable to the battery I crossed my fingers and started the truck which immediately died(normal) after restarting the engine light was gone and I drove it around the neighborhood. All is good and when I had questions I emailed them to support with pictures and got a response right away. What was even scarier after was thinking about those mechanics I took my truck to and how much it was going to cost me if the air pumps did not fix the problem because there are other pieces to this puzzle as simple as a corroded terminal in one of the connectors. Great money saving product with helpful people Thanks Hewitt-tech.

[@Hewitt-tech]

Jack we really appreciate you sharing your experience and glad you found us. Your right it is scary to think you could have spent $$$$ repairs and may not have fixed the issue. Aftermarket components are trash and we have even seen customer go through 2 - 3 sets of Factory/OEM equipment before they find us. If there is anything else we can assist with do not hesitate to reach out.

[@TheGearDudes]

After Seeing p2442 code and multiple limp mode incidents on my 2008 5.7L Tundra. Was told by Toyota dealer I needed a $2,995 repair to fix the errors. I Installed the Gen1 bypass tonight and so far seems to be back to normal operation. Thank you!!!!!

[@The3rdCoin]

Hello, any update on how it’s going? Mine came on, on my 2013 5.7v8 Tundra

[@billiondollardong]

@@The3rdCoin mine just came on 2011 4.7 v8. gonna get one and hope it doesn't lead to issues down the road

[@The3rdCoin]

My 2013 Tundra hit 119,000 miles. The engine light went off leaving the house. It got into limp mode, I drove it back to my house. Put the scanner & it was P2445 code tho. I deleted the code, and drove it around for a day & it came back on. So I will take it to a mechanic to get a full inspection & and see what the cost will be.

[@billiondollardong]

@@The3rdCoin its gonna cost 2000-3000 unless you bypass

[@The3rdCoin]

@@billiondollardong actually my code is p2445??

[@thomashayes1431]

Fantastic product! Great instructions, awesome customer service, and easy to install!!! 2011 TRD Rock Warrior

[@Hewitt-tech]

Thank you for leaving your feedback. Let us know if you need anything else!

[@jmc4181]

I have a 2012 Tundra 4.0 Liter. I had codes 2440 and 2442. I contacted Paul from Hewitt. He guided me through the process of installing the Gen 2 bypass. I hadn't done much automotive work in the last decade due to age and injury so I was leary about doing the work myself. Once I got the kit and watched a few videos I went to work with the very clear and concise instructions. Turns out the intallation was about a 2 on a scale of 1-10. Really pretty simple. I had little issues accessing the the bolts and screws. The block off plates slid right in. After I completed the install I started her up and had a little bit of vibration for a minute or two. No codes. No idiot light. I drove it for 4 days on all conditions and have had no problem. Paul Hewitt replied to my emails promptly and in enough detail to make this easy. The service and support was as good as it gets. I saved myself a good 2 grand probably by using the Gen 2 bypass. Thanks Paul!

[@Hewitt-tech]

I am glad you got everything installed and it went better than you were worried about. It was great talking with you and if you need anything else just let us know. As you were!

[@jmc4181]

@@Hewitt-tech hey Paul, just wondering. I’m gonna drive to Pa from S Florida in Oct. Do you think it would be wise for me to buy the other cable, forget what you called it. The one in case your sensors go bad. In case it goes bad on that drive. If so how much and I imagine it’s simple to snap on, right? Thx again. Hey, I read all these comments. You are running a business the way it used to be and ought to be. You should teach classes on how to treat customers. Seems that all your customers feel the same. Semper Fi!

[@markpeters910]

I installed the Gen-II on my 2011 Tundra 4.6L with relative ease and it only took two hours. Hewitt's KZbin videos helped immensely, plus a couple of others I found demonstrating the installation process. The CEL came back on shortly after installation of the bypass kit. I emailed Hewitt support and the owner replied immediately. That in itself spoke volumes to me about this company! Mr. Hewitt suggested I install the optional pressure sensor on Bank 1 to see if it would resolve the codes I was getting. I was impressed that he did not try to convince me into buying a pressure sensor for Bank 2 unless I truly needed it. Turns out I did indeed need the second pressure sensor which took all of one minute to install. Since then, my truck has been running like a champ! Finally, each time I placed an order I paid for overnight shipping from their location in SC to Dallas, TX and the part was sitting on my doorstep by 9:00 AM the next day. Again, great customer service. I highly recommend this company and their products!

[@fvnocona4427]

I bought a Gen II SAIS kit and a PSO for my 2007 Tundra from Hewitt Tech February of 2021 and just made time to do the install in Jan 2022. I'm not terribly mechanically savy but Paul's system and instructions made the installation a breeze. The components are high quality; the installation instructions include photos of critical steps and are easy to follow. I would recommend this solution for any Tundra owner that is facing Secondary Air Injection System failure, it is an excellent fix with top-of-the-line support.

[@jondavis2206]

Is your tundra still running well?

[@fvnocona4427]

@@jondavis2206 I haven’t had any trouble since the install. No warning codes or power issues. I use my truck for my business up here in Alaska so I feel like if there were going to be any lingering issues, they would have been apparent by now. I have no reservations recommending this kit to fellow Tundra owners.

[@quacky125]

Installed this kit on my 09 5.7L Tundra before I had any issues and so far works fine. This was a challenge but doable. What helped was taking off the front wheels ( you will need to do this anyway to install the block-off plates) and lower the front end down for easier access to the air switching valves. Use one of the tires to stand on instead of a plastic slip and slide step stool to stand on. To remove the switching valve (made in hell) connectors, I had a very small flat bladed screwdriver 1 1/2" length with a shank 3/4" long with a dia. .075 (a little over 1/6"). A nail would probably work. Insert this in the top hole back of the connector to override the latch. Now you can focus on the connector body without damaging the wires in the process. Practice this with the connector on the airbox (same one used on the valves). Hope this helps.

[@renewes5813]

Installed the Gen 2 kit in my 2013 Tacoma. Couldn't be easier. The trick of going through the wheel well was awesome. The truck is running better than ever! Your Customer service rocks!

[@Hewitt-tech]

Thank you for your support and feedback! This is why we do what we do.

[@willy4998]

My 2008 toyota tundra 4.7l is now running smoothly and out of limp mode. The kit truely is plug and play and the blocking plates were easy to put in from the top not the wheel well on my truck. excellent instructions, and the customer service was also excellent answering my questions prior to my purchase as well. would definitely recommend it to anyone with a tundra having those SAIS engine code problems. Thanks.

[@markgunder5593]

Is there step by step instructions with the part when you receive it?

[@willy4998]

Sorry for the delay hope u got it fixed... The instructions are awesome if u still are considering it and there are videos on KZbin as you know

[@willy4998]

Just a followup... Still got the truck and the kit still is running perfectly after 2 years

[@oddballdynamics.9658]

Just finished this installation. It did the job. No warning lights and no limp mode, my truck is now running great. Thank you so much. 08 Sequoia.

[@christian_7500]

I just installed this kit on my 2012 Toyota Tundra 4.6L. It did the trick! The switching valves are in the engine bay rather than under the wheels for my truck. Loosening the bolts on the switching valves for the block plates installation, especially the one near the air filter, were the toughest parts of the install for me. All in all it probably took me 3.5 hr - I’m mechanically inclined but more on the home improvement side of things. Very happy with the product, so far. I really hope it holds up over time. Thank you, Hewitt

[@handlesarestupid1234]

Customer service with Hewitt tech is second to none. These guys are the best.

[@Hewitt-tech]

Caleb, thank you!

[@RVSTundrae46]

2008 tundra 5.7 Just had my full kit installed, did the install myself. It went smooth overall, even though there are tight spaces and hard to get to spots, helps being tall with long arms and big hands 😊 The CEL went off right after, with out having to plugging in the code reader and erasing codes. Truck passed emissions with no problems. Huge Thank you! to Paul Hewitt and his team for developing a great product that works, it’s definitely worth the money invested to keep our trucks on the road.

[@Hewitt-tech]

Thanks for taking the time leave a comment and really appreciate the kind words. Glad we were able to get your Tundra back on the road and out of Limp Mode. Please let us know if there is anything else we can assist with.

[@TheSyuka0]

Just installed mine!!! Couldn't have been any easier!! Thank you Hewitt!! Instructions and photos were incredibly clear. I feel like I have a new truck!! You guys rock!!!

[@basedgodrodney9466]

Will it pass California smog after bypass?

[@matthewwatkins1156]

4 real man do this kit really work,, my 2012 tundra engine, 4 Lo, Trac light keep coming on

[@TheGipSeeOwl]

Installed this on my 4.6 tundra with the pressure sensor add ons. Worth every penny and installation was a breeze. $5000 was the quote I got (definitely high balling) for the entire system rebuild. No brainer, the bypass kit is the way to go and they ship so fast, even back ordered parts were only an extra 2 days. They stay on top and stand behind their products.

[@Hewitt-tech]

Thank for your your comment and feedback!

[@askforbelinda]

So your sensors were bad? I have a 4.6 just had the Gen 2 kit installed and it has not fixed the issue. Maybe need the sensor add-on? Did you get a code from your reader that the sensor was bad? I have not.

[@sircumference3325]

Hewitt technologies has been super professional and their product worked exactly as advertised. It was as simple as plug and play for me, though in some instances other vehicles may require some of their additional products. Their team is kind and understanding, they worked with some of our mistakes gracefully and quickly. Excellent, excellent company, and an effective and important product as well!

[@Hewitt-tech]

Thank you for taking the time to leave your feedback! if we can help with anything else please reach out to us directly.

[@keepingsmokey]

My 2008 Toyota tundra was giving me trouble codes I called a local dealer and they told me it would cost me upwards of 4500$ so I started looking and I found the Gen2. I want to thank you I installed the Gen 2 and an add-on on Dec 22 and up to now it's been working great. it took me about 1 hour to do but I did have a little trouble with the blocking plates which I overcame. Thanks again

[@Hewitt-tech]

Great news and we really appreciate you leaving a comment. There is nothing better then getting Tundras back on the road and money in your pocket! If there is anything else we can assist with please do not hesitate to contact us.

[@dennismccarthy676]

I ordered the Gen II kit and was at my door in less than a week. I live in north western Canada. Thank you for the prompt shipping! Installed the unit today and it was a bit of a struggle to get the passenger side connection off but all in all very straight forward. Great video and instructions that came with your product. Thanks again from the Great White North.

[@Hewitt-tech]

Always Great to hear! Thanks for the Feedback and let us know if we can help with anything else.

[@brianturnbull9248]

In response to a P2443 code, I installed Hewitt's Gen 2 Bypass Kit in my 2007 Tundra a couple of weeks ago and fixed the problem. Spray the bolts in the wheel well several times during the evening where you install the block plates and let them sit overnight, and loosened mine in the morning, no problem. And I'm in the rust belt and my truck is 16 years old. Regarding the two final electrical connections at the rear of the motor, Practice undoing on the new ones that comes with the kit, or practice on the one mounted on your air cleaner housing. Put a trouble light back there because if you can get a visual on it, it really helps. The drivers side is easier to access and depress, it's sitting right at the corner. If you have trouble depressing the clip, my thumb's kind of fat and wide so I taped a one inch long piece of very small dowelling up the centre of my thumb, a little piece of a twig off a tree would work fine. The passenger side, I threw a cushion down and climbed up there and I could barely see the clip past the wiring harness, but good enough to get a dental pick on it with my right hand, lift the locking clip just high enough to clear, and with my left hand in place and my fingertips just able to grab the connector, pull it apart...and Bob's your Uncle! Then hooking up the kit connectors is easy and away you go! Tech support is outstanding if you need help!

[@Hewitt-tech]

To a T my good sir. We really appreciate you writing about your experience installing the HT Bypass Kit. Particularly the 5.7L can have its challenges. I could not agree more with your use of penetrating oil and liked your tips about depressing the tabs on the connectors along the fire wall. Where there is a will there is a way!

[@jcnunny]

Installed a week ago and no more codes or limp mode on my 2008 5.7 w 187k. I was getting the P2443 codes for both banks - stuck closed. Took me a while to get the passenger plug undone, and the block off plates were easier than expected. Worth it!

[@firegrunt03]

Which one did you order gen1 or 2 ? Which one is required for which? Ty

[@matthewwatkins1156]

Good morning,,quick question my 4lo,engine ,trac ,light all comes on do u think this bypass kit will make them go out

[@jcnunny]

@@matthewwatkins1156 It may - if you don't have a code reader, an auto parts store will usually scan for free and give you the codes that are causing the faults. Check that first - mine was P2443, and this kit fixed it.

[@jonctipton1982]

I had to replace the passenger side pump on my 07 4.7 tundra a few years back. Cost me about $400 doing it myself. Didn’t know anything about Hewitt back then and didn’t know the problem could reoccur because of terrible design by Toyota. Got another code for a pressure sensor (p2438) this week and went into limp mode. Got the double sensor harness bypass and SAIS bypass (gen 1). Putting the harnesses on and fishing the starter relay took all of 10 minutes. The exhaust block off took about an hour just because of the tight space on the passenger pump. Cleared the codes and now it runs like a top. It’s a bummer a company like Hewitt had to fix a significant issue from Toyota…. Kudos to Hewitt. I highly recommend them if you have any problems with your SAIS or AIP…whatever the acronym is :)

[@Hewitt-tech]

John you know what they say, "necessity is the mother of invention". I agree it is unfortunate the failure prone SAIS has not been addressed but Hewitt Tech is happy to meet the need with a comprehensive solution and affordable solution. Thanks again for taking the time to leave a comment and review. Give us a call if there is anything else we can assist with.

[@kevinwineland8289]

I have had my bypass kit for my 2005 Tundra 4.7 for about 4 years now and it is still working great. I was having some issues with my truck that i could not figure out. I contacted Hewitt-Tech asking if maybe the issue could be with the kit. After checking it and found out it was in good working order they kept emailing me until i found the problem. They went above and beyond to help me. Awesome people that still care about others.

[@shanemichael8066]

Was your problem related to the mass airflow sensor?

[@MrMaggiemay56]

Installed mine .on 2007 5.7 tundra took me about 2 hours,im 65 years old with bad knees and bad back got son inlaw to do back plugs,he had skinner arms

[@Andrew-mn6em]

Was it this exact kit ?😊

[@JustinKretlow]

What an amazing product and company to work with. The GEN 2 kit is fool proof and very easy to install and works as advertised. 10/10 would recommend Hewitt to anyone.

[@Hewitt-tech]

Thank you for the feedback. Please let us know if we can help with anything in the future.

[@awcopeland]

Put my Gen 1 kit on- 05 Toyota Sequoia- running better than ever. Very happy.

[@joshuahoa5463]

I just installed the bypass kit today on my 2010 Tundra. I took off the intake manifold and it made it a lot easier to hook up the harness. The videos and directions that came with the kit were excellent as well!

[@rem700longunner]

Suggestion: Until you get the connector block off plug solution worked out, if you are just going to tape off that connector, pack it with dielectric grease first. That will make sure that no moisture forms inside and starts corroding it.

[@Hewitt-tech]

*UPDATE the plug blanks are shipping with the kits.* Hey Remy, The plug molds are in production. The grease is a good suggestion if anyone ever thinks they may go back to using the SAIS. You for sure don't want corrosion on them if you need to use it again for whatever reason, prevention and then sale is what I would think. From our point of view we just wanted to make sure no one was arc welding anything. Anyone who has disconnected the positive battery terminal and touched the wrench to anything knows what I am talking about. Thanks for commenting!

[@Hewitt-tech]

*UPDATE the plug blanks are shipping with the kits.*

[@jakeestrada1239]

@Hewitt-Tech Are the molded plugs for when you unplug those oem air switching valves?

[@davidscott9466]

I just completed my 2010 Toyota Sequoia 5.7L. The product worked great! I found the video(s) most helpful as I'm an amateur mechanic. My son will be installing it for his 2007 Toyota Tundra 5.7L as well. Thank you!

[@rj8296]

Do you mind explaining to me what this is for ? Is it for the air suspension vehicles ? I'm looking at replacing a rear air bag/shock on a 2008 Sequoia Platinum and I starting to think maybe I should do the coil conversion. Is this all related ?

[@davidscott9466]

@@rj8296 My vehicle went into "limp mode" and this bypass eliminates that problem. FYI, I'm planning the coil conversion too but I don't think it's related to this problem. I'm replacing the air suspension because I'm hauling trailers and need the added support.

[@rj8296]

@@davidscott9466 from everything I’ve read air bags are far superior when hauling, that’s why Semi Trucks have them. I ordered new air bags for mine.

[@davidscott9466]

@@rj8296 that may be true for semi tractor-trailers, I wonder why Tundras don't come with the airbag suspensions. Sequoias are essentially on Tundra frames.

[@rj8296]

@@davidscott9466 They actually do have the air ride option in the newer models. Many people that tow heavy campers add them using aftermarket companies.

[@coachcrawmer5229]

Completed this on my Tundra and couldn’t be happier!

[@Hewitt-tech]

@coachcrawmer5229 Thanks for leaving a comment. We know we have done our job when customers are happy and trucks are running!

[@kevinsmith7164]

Just completed the install on my 2008 5.7 Tundra. As advertised the Passenger Side plug is a bear. I used a hand mirror to visualize the plug and went from the front... just couldn't do it. Son in law has smaller hands and he did it in like 30 seconds. I believe Mr. Hewitt's small frame skinny arms tech in the video is on the passenger side in the demo for a reason lol! I had previously bought the competitors (Ruitech) unit and installed but it failed after a year and went again into limp mode. After emailing Tim (owner) he sent back that they didn't sell their units for 2008 5.7s as it would inevitably fail (his words). Maybe it was my mistake but I usually don't mess up with something like the year model on my truck... anyway I'm glad I finally went with the Gen II and pressure sensor and my truck is running great at 350K miles.

[@Hewitt-tech]

We try to make people aware of the difficulty in getting to those connectors for sure. We don't try to sugar coat it. And you are absolutely correct about why I wasn't on the top of the engine...my guy was a former Toyota tech and had hands half the size of mine. Glad everything worked for you! Let us know if you need anything. Paul

[@ShermNE]

Just installed Gen II on my 2011 Tundra with 4.6L Engine. Took 2.5hrs. Rusted bolts under brackets holding AIDs slowed me way down. I sheared the heads off of 2 of them, can't believe those bolts extend into the wheel well exposed to salt. My bracket is held on with 1 bolt and a few attachments to wiring harness clips. Will need to get them drilled out in the future. Backoff plates required loosening all three 12mm bolts holding the ASVs on the engine block. Once the ASV is loose, you can open up a gap just big enough for the block off plates to install. First start of the engine was a success, we will see how this goes after a few cold overnights but so far...very impressed.

[@Hewitt-tech]

Ahh... yes, I have run into trouble with the fender bolts before. I know this doesn't help now but may help someone else, if you hit the exposed threads really well with a wire brush/wheel and some penetrating oil it will help a lot in removing them. Drilling through or grinding the weld nut off and usign a stainless bolt with the nut on the topside would work well for that. On the 4.6L there is that one clamp that holds the air tube down to the top of the valve cover. We found it easiest to We found it easiest to just remove that bolt and carefully pry between the back of the cylinder and the air tube to open that gap. Loosening the air valve is a good and will help give you some more room as well. Getting the ASV bolted back down with the plate installed is a lot trickier if you remove the bolts holding down the ASV. Glad you were able to get it all installed without too much trouble though and that it is working. If you need anything just let us know. Paul

[@ShermNE]

I have run the truck over the last week and …oh my god…best thing I have ever done to any vehicle.

[@Hewitt-tech]

@@ShermNE Really appreciate you taking the time to leave a comment. If there is anything else we can assist with please do not hesitate to contact us.

[@ryanv7195]

I just completed installing this on my 2012 sequoia with the 5.7 engine. Gotta say the connection to the driver's side pump was extremely hard and did not go like the video. I found it helped removing the line he said but also i loosened the holders for the main wiring harness which was really hindering me from getting my hand on the clip. My clip was very hard to depress probably due to age. For the passenger side i used a picc and screwdriver to disconnect the wires. The picc raised the retaining clip and flat head pushed it off. The wifes little hand helped connect hewitts connection to the valve. I also got the caps installed (driver side was worst) and so far so good. No codes and shes running fine.

[@Hewitt-tech]

@ryanv7195 We really appreciate you taking the time to share your install experience. Each vehicle can provide different challenges and the more feedback there is the better it is for the community. What you described is not uncommon but loosening up the bolt and main harness does give you a little more wiggle room when installing. I think your wife is the real MVP and glad the truck is back up and running without any error codes. If there is anything else we can assist with please do not hesitate to contact us.

[@G0dyo]

Something I did that seemed to help a bit was I took the driver side front tire off and lowered the entire front end so I could reach the back of the engine much easier. I then laid some floor mats across the top of the radiator and engine to be more comfortable

[@Hewitt-tech]

Travis great idea and I bet did help with accessing the Air Switching Valves! Also, good call on the floor mats. The process can get pretty involved every little bit helps when diving into the engine bay.

[@KurtBraunel]

Just installed my kit yesterday, very good customer service, instructions with pictures, and helpful videos too. They were not kidding about getting the clips off between the engine and firewall on the 5.7 L Everything else was easy, sprayed down the flange bolts a couple times 2 days before and they came off very easily. But the clips gave me some issues, ended up using tiny screw drivers to pry the clip up for removal. Good service and tech support overall!

[@Hewitt-tech]

Always good to hear. Yep, unfortunately on the 5.7l it can be a little tricky getting to the connectors. It is still way better than having to remove the intake manifold and replacing everything. If we can help with anything else just let us know.

[@KurtBraunel]

@@Hewitt-tech absolutely not even a question about it, why replace the parts when they will just fail again.. I was making a simple pointer for anyone looking to DIY this project, I had issues because it was my first time, if I had to do it today it would be a lot easier.. just trying to help people with a small tip beforehand, thanks again!

[@Hewitt-tech]

@@KurtBraunel Exactly. It would be nice if the 5.7L was as easy as the other engines but unfortunately that is just what has to be done to make it plug and play. Cheers!

[@danflowers6845]

Hopefully a helpful hint. Installed my Gen. 2 on an 07 tundra 5.7. I did the passenger clip from the driver's side reaching behind engine. Much easier. Check engine light is off and transmission shifts properly...

[@eric-j7r8r]

I was planning to have a shop install this kit for me but when package arrived and I saw how in depth the instructions were (including color photos) I decided to do it myself. Overall was very easy, installing the block off plates on my Lexus gx 470 was the hardest part. Highly recommend Hewitt technologies

[@Hewitt-tech]

Eric thanks for taking the time to leave a comment, we greatly appreciate it. Glad installation when well for you and decided to give it a shot yourself. If there is anything else we can assist with please let us know.

[@christopherO243]

I think you meant “drop a screw” and the nut goes on the back of the screw. Now ya know. Thank you for the video- i needed this!

[@patmagnatta3420]

Put my Gen 2 kit on today. And 2007 Tundra 4.7 runs better than ever! Thanks alo Guys!!

[@supereddiee]

Did you follow this video? Was it the same for the 4.7 or did you follow instructions included? Looking to do the same with my 2007 4.7

[@SeahawkAz]

@@supereddieeit’s easier on the 4.7L 2007 the air switching valves are on the valve covers and not on the rear of the engine like the 5.7L

[@supereddiee]

@@SeahawkAz yeah it was pretty easy, already installed and sold the truck by now lol

[@jasonnolan1945]

Mine has been on two years and working great!

[@Karma_HealerDealer]

Toyota would not honor the warranty to replace the SAIS in my 2012 Tacoma 4.0L because it was Rebuilt, and wanted over $2k to fix it. I could have ordered the part and replaced it myself probably, but it still was going to be over $500, and this was going to be the first time fixing something with the engine myself. AND I read reviews that part goes bad every 10k miles or so in ‘12 Tacomas because of bad design, so I decided to take my chances with the SAIS Bypass kit instead. Yes, yes, and yes. It paid off. It was not easy for me to figure out where everything had to connect to (it took me several hours overall), but once figured out, you’ll realize it wasn’t that difficult. The exhaust plates that come with the package are identical, but I came to learn that one of the SAIS ports in my vehicle was modified because that side was where it was rebuilt. All I had to do was get a metal file and grind one of the plates down a little to make it fit, tighten it back on, done. With the 2012 model you also may not need to install the purple relay wire they give you, but just follow the directions included in the package, and Customer Support will let you know if that’s the case. They were as quick and helpful as advertised. If you have any questions or problems, just contact them however you like. I cleared the CEL codes by disconnecting the battery, and have been running it for over three weeks now. No limp-mode, starts beautifully, runs great. Saved me big $$$ and I never have to worry about the part again. Thank you!

[@Hewitt-tech]

Hey Andrew, Glad you got it all figured out, thanks for the feedback. Just so people don't get confused, you got one of our Gen-1 V54H kits, not a Gen-II kit shown in this video. The Gen-II would have been a much easier option for your 4.0L Tacoma than the V54H. The V54H kit connects to your MAF sensor and ECT sensor which on the Tacoma 4.0L is a trick to get to down the back of the engine. The Gen-II unit install on your would have taken 10-15 min..it replaces the air injection driver like in this video but plugs into both your air switching valves which are right there in the open on the passenger side of the engine. Just let us know if we can help with anything else. Thanks, Paul

[@sergiocabal8233]

Just installed mine in my 2012 Takoma, unfortunately, it does not work. The check engine light comes on right after turning the truck on, and that's right after clearing the code. I will call their customer service tomorrow and hope they can help me figure out the problem

[@Karma_HealerDealer]

@@sergiocabal8233 customer service was patient and helpful with me. hope it works out for you.

[@curtishigh2567]

It's a damn rip off just by the replacement parts and fix it yourself you'll thankk yourself in the end

[@jaywiseman3778]

14:00 the wife and I just installed it tonight Codes are gone. Helpful tip to disconnect the passenger side connecter use a screwdriver go between the main wiring harness, and the motor push down on the clip comes right off 5 seconds unbelievable couldn’t believe it. I wish I would’ve done that to the driver side as that took like 20 minutes. 2007 Toyota tundra, 5.7 L. 478,000km

[@Hewitt-tech]

@jaywiseman3778 Thanks for passing along your experience and these connectors can be a bit of a bear to get to. Glad to hear your codes are clear and the truck is back to normal. If you have the time we would greatly appreciate if you could also share on our Google review page. Please let us know if there is anything else we can assist with in the future. g.page/r/CYkk2OeC9CgvEB0/review

[@duchessofG]

Gen II installed on 06 Tundra after a lot of info from the Hewitt Tech. After install the issue was gone & passed emissions. Finally!

[@Hewitt-tech]

Glad you found Hewitt Tech and that we could help end your SAIS issues. Thanks for your comment and if there is any value we can add in the future do not hesitate to contact us.

[@michaelbower7272]

If there was a magic wand for SAIS repairs, it would be named after Hewitt Technologies. I installed the Gen-II SAIS Bypass and both Pressure Sensor Options (both PSOs due to a bad air switching valve on my 2008 Tundra 5.7L) and it wasn't that difficult with their detailed instructions. As soon as I started the truck the check engine light was off and out of limp mode!

[@waynemcmullen1933]

On the 2008 5.7 , if you remove the wiring harness bracket on the firewall passenger side it gives you a little more Room for your hand. Other than that it’s all by feel. Just got mine installed and so far it works good

[@Hewitt-tech]

Yes! It certainly helps which is why we mention this in the instructions.

[@daveduvall5929]

Just installed the gen-11 kit on a 2010 tundra, had replaced the switching valves with Dorman brand from Rock auto, one of them only lasted a week, installed the kit and still could not cancel one code, put old valves back in and all seems good. Pulling the intake is not a big deal if one has trouble getting at the switching valve connections.

[@Hewitt-tech]

It was a good call trying your factory valves to see if their pressure sensors were still good! We have recommended trying that on other engines than the 5.7L because the valves are easier to change on them. We typically recommend our pressure sensor addons to save having to replace the valves on any of the engines. The Gen2 must use an actual pressure sensor for each valve while the Gen1 kits we can use just a jumper harness or a harness with a pressure sensor if both are bad. Just let us know if you need anything else. Paul

[@karl8747]

Installed yesterday. Check engine went away right away. Finished the block off plates today. When doing the bypass module, only hard part was reaching back of engine. Used a mirror on handle to visualize where the plugs needed to go.

[@basedgodrodney9466]

Will it pass california smog after bypassing?

[@joshuariggs2458]

Installed mine on a 4.6L tundra. Works fantastic!

[@imdiggingit5521]

Just did this kit on my 2007 Tundra 4.7L, wow. shipping was super fast and the kit was really easy to install for me. I loved the instructions everything was described perfectly and the pictures were good quality. (I have more trouble understanding ikea instructions…) I called in just to ask a couple questions about the product and was instantly confident that this was the way to go, all in all truck is running great and had no issues after the install if anything I think it’s running better! Thanks Hewitt-Tech I’m a happy customer, Also thanks for the pen and light included in the box!

[@tmashadi]

Just got done with the install. It's gonna a take 500 tries for some of us to unplug the 2 wires behind the manifold but don't give up. It will work. Put on knee protection and go up over the engine and feel your way around the plug cause you can't see it and need to feel your way around it. *** the hardest part was separating the flanges to put in the blocking plate. I spent hours until I got a floor jack and jacked up the stick that was pushing on the stud. The trick was to have the middle of the stick backed into break/disk so when I jack it up it won't pop off or push the jack back. Use hard wood cause I pushed it almost to breaking point.

[@owenhutto8106]

Yeah this is kicking my tail in doing the wires in the back

[@brendanreary9142]

I have been trying to get the harness connections undone on the AVS for over an hour. The 1 hour install estimate is very optimistic, the passenger side is very difficult to reach if you have large hands. I’m probably going to have to remove and or move a lot more of the factory main wiring harness anchors to get at the bank 2 ASV connection.

[@Hewitt-tech]

Sorry you are having or had a hard time with the connectors. The passenger side in particular on the 5.7L certainly can be difficult, even for an experienced mech/tech. Unfortunately, it is what it is which is why we warn about it in the video and instructions and point out some things you can remove and unbolt to get a little more room. No sugarcoating there. A topside creeper or placing several layers of cardboard on top of the engine bay you can lay on helps a lot so you don't have to support yourself with your hands. I find laying the tip of a small flat headed screwdriver on top of the tab really helps depress the locking tab and makes it easier to pull the connectors off. You can also use a long screwdriver or blunt punch/ round file to depress the tab and use long reach needle nose pliers or another long screwdriver to catch the side lip of the connector to push-pull the connector off. Just be really careful not to damage the wiring. If we can help with anything just give us a call.

[@thekid4888]

I snapped the bolts off on the manifold where the backing plate goes, bolts were easily drilled out . Not as hard as ya think, just get 2 foot 1/4 inch drill bit and some patience

[@Hewitt-tech]

That is quite the drill bit! Glad you were able to get that done and hopefully your comment will help some of our other unfortunate customers deal with this! Thanks for the comment.

[@MaximumDIYGarage]

Sweet GX470 in the background!

[@Hewitt-tech]

Thanks. I needed to get back in a 4.7l to develop the GenII-3V kit (specific to that style 4.7L). I had to completely rebuild the suspension and driveline. It still needs some work but so far is my favorite of the 4.7L Toyota/Lexus vehicles I have owned. I wish I could have bought one new.

[@saturnfire]

Just ordered yout kit for my 2008 Sequoia. read through a lot of forums, so hope it works out.

[@Hewitt-tech]

Please give us a call for a consultation and we can help make sure you get everything you may need from the start. Toll Free 1-844-307-7671

[@saturnfire]

@@Hewitt-tech Getting the plugs off are a challenge...still working on trying to get the passenger side off...will try again in an hour...

[@saturnfire]

Got the connectors installled...Now off to doing the blocking plate...

[@Hewitt-tech]

@@saturnfire I am glad you were able to get them done. They certainly can be especially the passenger side. I wish there was one trick that I could recommend that would work for everyone. I try to lay the tip of a small flat head on the tab and use your thumb to depress the tab. Then if you can a long flat head can be used to catch the edge of the connector and carefully pry to help pull the connector off. The most important thing is just to be careful not to damage the wiring or connector.

[@colindeloughery5996]

just installed mine on my '12 tacoma V6. easy and straight forward. Thanks

[@supereddiee]

Wish y'all had a 4.7L gen 2 bypass install video.. looking to buy it soon for my 2007 4.7 tundra.

[@supereddiee]

*Update* I bought and installed the kit for my 4.7 and the instructions included were great. Very detailed step by step with included pictures. Thanks a lot 👍 everything went smooth.

[@MichaelValdivia-y2x]

I just installed the Bypass Module yesterday, probably took longer than it should but I was moving pretty slow. If you follow the video or even the directions included you should be able to do yourself. I sent an email with some questions only to get an actual response from Paul! Yep he gives a shi. about his product and your success with it.

[@hinds90]

I just installed the gen 2 kit on a 2008 4.7 tundra i just picked up. Great instructions and worked like a charm! Only thing is I installed the block off plates at the air valve. Is that okay and can I take the air valves out all together

[@Hewitt-tech]

@hinds90 In order to remove the Air Switching Valves located on either sider of the engine you will need a full delete kit. That is the Gen 2 Bypass Kit and 2 Pressure Sensor Addons. However, if you only have the Bypass Kit then they will need to remain on the vehicle. This is because there is a pressure sensor inside the Air Switching Valve the ECM is still reading. If you have any questions please do not hesitate to give us a call.

[@BullseyeMetalWerks]

@@Hewitt-tech yep. So I'd just need the pressure switches. I'd like to get rid of them all together. Makes it easier to get to the coils and plugs.

[@Hewitt-tech]

@@BullseyeMetalWerks Correct. You can get two of our pressure sensors add-ons to accomplish that, one to replace each of the air switching valves. If your air valves/sensors are still good, you can also cut the sensors off the air switching valves and get rid of the rest of the valve. They have to be the factory type of valve with the metal body and the black plastic top where the plug is to do this. If you cut all the way through the square black plastic body section as close to the metal valve body what remains is the sensor/connector. When doing so you will cut through the plastic and will cut two wires but those are only for the solenoid coil portion which are not connected or used with the Gen2 kit anyways.

[@spiralnapkin]

I just ordered one for my 2008 sequoia. I really hope this fixes my CEL. Can I remove the pumps after this is done? Are there any issues doing that?

[@Hewitt-tech]

With the Gen2 kit installed, the air pumps can be removed from the vehicle without any codes for the air pump circuits. P0418/P0419 It is illegal to remove, dismantle or otherwise cause to be inoperative any pollution control device required by federal, state, or local emissions law. . No other applications are intended or implied. By installing or using this SAIS Bypass Kit the vehicle owner and installer acknowledge and assumes ALL risks associated with its use.

[@jahnkaplank8626]

The kit came with the little block-off plates, when/why do I have to install those? This video makes it sound that I just have to 'plug and play' the unit and that's it.

[@Hewitt-tech]

The module and plate installations are covered separately because they both vary according to engine and year. The block off plates are an integral part of the overall bypass solution and may not be 100% required for every instance. However, they are always recommended to be installed with the module and are the only thing that can prevent the valves from leaking in the future if they are not currently. If you do not currently have valve stuck open codes you can install the module first and see where that gets you but it always best to install them so you don't have to worry about the valves later on. If you don't install them just make sure to put them in your glovebox with the instructions because if you get a valve stuck open code later you will need to install them at that point and clear the codes(s) again.

[@daviesn1991]

Great video. Please I'm trying to do this on my 2008 tundra 4.7 liter. Do you have any video/ link on that? Thanks

[@Hewitt-tech]

Not at this time. I have one for a 4.6l that is pretty much the exact same but have not finished editing it yet.

[@daviesn1991]

@@Hewitt-tech ,ok will be waiting. Thank you.

[@Scottyp857]

@@Hewitt-tech Do you have the 4.6l finish I just bought the Gen II and ready to install

[@Hewitt-tech]

@@Scottyp857 Unfortunately not yet. It is next on the list but upgrading our website took priority recently.

[@chrisssmith4]

@@Hewitt-tech I just bought a kit for my 08 tundra 4.7 have you finished the video yet and does that need the block of plates installed

[@yochino615]

Everything went smoothly except unplugging the OEM connectors. Still having trouble getting it undone.

[@Hewitt-tech]

If you can't get your hand back there or enough leverage to squeeze the lock tab and pull... try pushing the tab with a flat screwdriver and another to catch the connector and push it off.

[@franklock123]

How did you fit your hand behind the passenger side??? Its super tight back there and the harness is literally right over it. I was able to force my hand back there but then my hand was stuck and i hand no leverage to pull the connector off.

[@Hewitt-tech]

You can unbolt the main engine harness support and a couple other things in the area to VERY gently get more room from the main engine harness. To unclip the connector try laying a small a flat head screwdriver on the tab so you can easily depress it with your thumb, or use your other hand to carefully push down from above with a long screwdriver so you can use your full grip strength to pull the connector off.

[@franklock123]

@@Hewitt-tech was finally able to get it off. Used a 12in needle nose plier. I was able to fit the plier in from the side and to get it off. Thanks.

[@franklock123]

@@Hewitt-tech i havent installed the block off plates. Its like 10° here in MN today so im planning to install them tomorrow instead of today. I did clear the codes and took the truck for a cruise around the block. The lights came back on and its back in limp mode. Im guessing once i install the block off plates, and re-clear the codes, it should solve it? I was getting code p2440 valve stuck open.

[@Hewitt-tech]

@@franklock123 installing the plates would certainly be the next step. They are recommended regardless of the code but are required if the valves are physically stuck open or leaking exhaust. After that and clearing the code(s) again if you get a CEL again read the codes and give us a call or send us an email.

[@franklock123]

@@Hewitt-tech ok so i just got done installed the plates. I cleared the codes. The code p2440 didnt come on anymore and im not in limp mode anymore. However, a code p0983 came on after 1min of driving. The truck wouldnt go into 5th or 6th gear. I stopped the truck after a few minutes. Re cleared the codes again. And drove it for about 15minutes on and off highway. The codes didnt come back and the truck seems to be fine. Ive never had the code p0983 before or had any transmittion issues. Wondering if its normal for this code or other codes to pop up after install the by pass kit.

[@jackorth4619]

Paul when you found that corroded connection during the installation of the Gen 2 kit I can only imagine what it would have cost $$$$$ the owner of that vehicle after the mechanics changed both air pumps, the relay, any fuses etc; and everything else they could think of and still not have found the problem.

[@twmclean1]

What is the average time required to complete the installation, bypass kit and block plates? Assume a moderately mechanically inclined DIY. Thanks.

[@Hewitt-tech]

For the Gen2 kit on a 5.7L we typically say 1-2 hrs. shop time.

[@twmclean1]

@@Hewitt-tech Thanks again for great support.

[@josemurillo1758]

I got the same problem with my tundra 4.0 L I wonder if there is a kit for my tundra v6

[@Hewitt-tech]

Absolutely! We recommend the Gen 2 Bypass Kit hewitt-tech.com/product/secondary-air-injection-system-bypass-kit-gen-2-plug-play/

[@mike201914]

Just got p2440 code for bank one valve stuck open. Debating which is better to bypass or just replace both valves. Truck won't accelerate, filly. Is this OK to drive as well, no stalling issues? Just accelerating. 4.6 v8 2011 tundra

[@travelwithoutacause]

I replaced the air injection pumps and injection valves in my 2008 Sequoia.. Still showing a code and still in limp mode. So frustrating after putting in all that work for nothing. I guess I'll have to get the bypass now.. can't imagine what else could be keeping it in limp mode. Code says sensors.

[@Hewitt-tech]

Could be wiring or ECM related. Give us a call, we would be glad to help.

[@Malhora]

This kit will make the P2443, P2438 and P2436 codes go away? Got a 08 tundra 4.0 v6

[@Hewitt-tech]

We can help with all of those codes but some of those are pressure sensor circuit codes that will need some special attn. Please give us a call toll free 1-844-307-7601 or shoot us an email [e-mail] before placing an order. Some of those codes can be the result of wire damage, sensor damage, bad aftermarket parts or even a damaged ECM.. We can still help take care of all those codes but sometimes it is not as straight forward as just needing the bypass kit.

[@bradspressurewashing2303]

Will any of your kits still work on a Tundra that has had the ECU reflashed by the dealership?

[@Hewitt-tech]

The GenII kit is compatible with all current model years and reflashes. There is currently a certain reflash for certain 12-13 Tundra and Sequoia 5.7L vehicles that makes them incompatable with our GenI V5xH kits but we recommend the GenII for anything 08 and newer anyway because they are a much better solution in almost every aspect.

[@stuarthicks2696]

Why no close up of the plugs? Looks like the big black factory pins left open? Still can’t find the plugs 🔌 on the back of the motor on my 5.7. The instructions have a close up pic but not a zoomed out one for reference. Searching other videos for better close ups. Seems such a simple omission.

[@Hewitt-tech]

Which plugs are you referring to for a close up? There are no factory pins that will be left open. The kit includes two custom plug caps for the large two wire black and gray factory connectors to be left disconnected. Because of the location of the air switching valves there is no way to get a zoomed out picture for reference. It is extremely difficult to get any sort of picture of the air switching at all because of their location on the vehicle. Most of that work has to be done by feel.

[@jlgarza1983]

Is that legal in California, will it pass the Smog Check?

[@Hewitt-tech]

All of our units are for off-road or emissions exempt use only and it is illegal to use them for on highway use. That said if you were to have your exempt vehicle checked it would not have any problems as long as there were no other problems, no check engine lights and the vehicle goes through enough drive cycles for all the other monitors to complete.

[@jakedsnake5106]

I have a 2012 sequoia ( 4x4 if that makes a difference ).. but I swear this 5.7 is configured differently, I’ve located the switching valves BUT where the connection leaves the valve it is then shielded in plastic with a bunch of other wires and I can NOT find where the other end of these connections go.. I’ve looked all over the place.. ( really hate to take off the manifold ).

[@Hewitt-tech]

All the 5.7l are the same. Give us a call toll free for support. 844-307-7671

[@gregearnest3055]

The damn plastic nipple securing my hose to my secondary air keeps breaking, not sure how. Will this unit bypass the use of the secondary so if it was to break there’d be no codes?

[@Hewitt-tech]

If you are referring to the plastic vacuum nipples on the air switching valves and as long it is not pressure sensors codes, then yes. Give us a call to discuss more specifically if need be.

[@myreviews7936]

Is this what prevents the car from Shifting into higher gears on the highway????

[@Hewitt-tech]

Many of the secondary air system's trouble codes will put the vehicle into what we call "limp mode" the vehicle will not shift electronically and the engine runs only baseline maps which means poor gas economy.

[@myreviews7936]

@@Hewitt-tech thanks exactly what I wanted to know. Will be contacting u soon

[@collinskola6856]

How long can this kits last before it fails to buy another one, or is it a life time kits that won't fail forever

[@Hewitt-tech]

Our kits are engineered and designed with the best available automotive grade devices and components with the expectation they will last the life of the vehicle. They are however still electronics which is why we cover all of our kits with a non-transferable limited lifetime warranty. If there is a problem this is where our full technical support takes over. If after troubleshooting we determine the unit has failed under normal operating conditions and use, we will replace it for as long as you own the vehicle.

[@shcaskey]

the key to connecting the passenger line is to reach it from the FRONT of the vehicle. to unplug the factory requires two actions...depress the release on the plug and push the plug off the connection. very awkward working from the passenger side. I'm right handed. I moved to the front of the engine. from that position I could reach the plug and complete the maneuver almost effortlessly. The driver side wasn't too bad.

[@Hewitt-tech]

@shcaskey We really appreciate you taking the time to provide your installation tip. Everyone experience is a little different and really helps when customers provide what worked for them. It can be a little tricky when trying to unlatch and remove the factory connect all the while not trying to pull our any pins. Well done and please let us know if there is anything else we can assist with.

[@ericdizney1700]

Do you think you could do a video on a gen2 for the 06 4.7 Tundra?

[@Hewitt-tech]

I have one filmed but need to edit and re-film some portions of it. Most all of my time this last year has been re-engineering to solve supply chain issues. The instructions are really good though as they were done at the same time as the original filming.

[@ericdizney1700]

@@Hewitt-tech I'm sorry to here that but appreciate what you are doing. Thank you

[@postmortemvox]

Hello, i have a 2008 Sequoia with code P2442. I was curious what the difference between Gen 1 and Gen 2 kits are and which one is needed for my truck? Thanks!

[@Hewitt-tech]

Here is a quick blog post that will help explain. Give us a call if you have any further questions. hewitt-tech.com/blog/secondary-air-bypass-kit-comparison/

[@Barton_Motors_Ltd]

About to order one of these for my 07 Will this turn my check engine light off? What are the block off plates for?

[@Hewitt-tech]

The Gen2 kits can take care of most of the SAIS codes that you may have but there are some exceptions. Once everything is installed you will need to clear the codes by resetting the ECM with either an OBDII tool or by disconnecting the neg. battery terminal for at least 2 min. to turn off the CEL. The block off plates are to permanently close the air switching valves and are used to prevent valve stuck open codes. Please check out the blogs and other information on our website: hewitt-tech.com Give us a call Toll Free and we would be glad to help make sure you get what you need and can answer all your questions or shoot us an email. 1-844-307-7671 [e-mail]

[@stuarthicks2696]

So there is not two different places to 🔌 plug each harness into for each bank just one? That is the one unplugged factory valve fitting is plugged into with the kits plug and the other plug plugs into the unplugged factory harness plug?

[@Hewitt-tech]

The Gen2 harness essentially 'T's into the factory harness and ASV for each bank. Referencing 1 bank at a time, there are two connectors on the Gen2 harness for each bank. Once you disconnect the ASV, the factory harness connector and the ASV will be open. The connectors for each bank are a mated pair. One connector of that bank of the Gen2 harness will plug into the open factory harness and the other will plug back onto the ASV. If you have any more questions please give us a call or email us and we can walk you through it.

[@Hewitt-tech]

@Stuarthicks2692 Think of the Bypass Harness as a middle man. It go in between the Air Switching Valve and Factory Wiring harness. The Connectors on the Bypass Harness are male and female so the connections will only mate one way. If you have any additional question happy to help you can give us a call at [phone] or send an email to [e-mail]

[@mattbradyfitness]

I had this kit installed about a year ago in an 08 5.7 sequoia. Today the p2440 displayed on dash unit. Secondary air injection valve is stuck open. How do you fix?

[@Hewitt-tech]

Did you install the exhaust block off plates that came with the kit? If not that is the first thing to do and clear the code(s) again. A valve stuck open code WITH the plates installed is usually indicative of a damaged pressure sensor. Please contact us direct by phone, email or the contact us page of our website and we can help troubleshoot. If it is a damaged pressure sensor, we have Pressure Sensor Replacement Addon that will take care of this WITHOUT the labor of removing the intake manifold to replace the expensive air switching valve set.

[@mattbradyfitness]

@@Hewitt-tech my mechanic installed I am not sure. Will be calling today, thanks!

[@charleshuyck5850]

Hey guys, 08 Toyota tundra 5.7 120k throwing P2442 code, truck in limp mode. I don't have to pass any emission test. Considering gen 2 kit but have one question, does it hurt the vehicle in any way to run it with the bypass kit installed? I was planning to keep this truck for a long time before this

[@Hewitt-tech]

The Gen2 bypass kit will not affect your vehicle negatively in any way. On your vehicle the SAIS will only operate on a cold soak start (Off for 7hrs or more). Not running the system on that start is no different than starting it cold throughout the day. Our bypass kits have been installed on vehicles for almost 10 years now with no issues.

[@edunuke]

I purchased the Gen 1 (V54H) for 5.7L 2008 Tundra. is there a video for the Gen 1. Thanks.

[@Hewitt-tech]

I have one filmed but unfortunately the last couple of years have been focused on supply chain and engineering to get around part shortages. I hope to get back to fleshing out this sort of thing soon.

[@edunuke]

@@Hewitt-tech Thanks appreciate it.

[@stevencochran2845]

I installed mine on 5.7 2010 tundra about a year ago and it worked great up until this week. ???

[@Hewitt-tech]

Hey Steven, sorry to hear if you are having problems with the secondary air injection again. Please email us or give us a call directly with your order number and the current active trouble codes and we would be glad to help. Could be something completely unrelated or something really simple like needing to install your block off plates. [e-mail] 1-844-307-7671 so we can start a ticket if we need to.

[@outlanderkid6524]

Im just install the gen II kit with plates and now i have the bank 2 catalytic converted engine light, ...there's something missing in installation or have nothing to do with it?

[@Hewitt-tech]

The two things should not be related. Give us a call or email us with your specific information and the exact trouble codes you are getting. Sometimes when resetting the ECM on vehicles that are in need of a tuneup or the 02 Sensors replaced can cause the codes to trip. This is because the computer cannot tune back to where it was fast enough before the code monitors catch the problem.

[@outlanderkid6524]

​@@Hewitt-techok

[@tracyshad8442]

Now i have a nasty ticking sound come from driver's side. Checked heat shields and they are fine. What else could it be?I'm semi handy and it took me a solid 3 hours. Customer service was great, written instructions were good for everything except the pump connection. If a person didn't know what to feel for, instructions were borderline useless

[@Hewitt-tech]

Sounds like you have an exhaust leak. Check where you installed the block off plates.

[@vasylkilas414]

Question, would this fix both banks with one unit or are two separate units needed?? Please help out I’ve got codes p2443 and p2441, indicating both banks are stuck closed.

[@Hewitt-tech]

The one unit covers both banks. You will notice in the video and instructions, the Gen2 unit replace both air injection control drivers with our single unit.

[@vasylkilas414]

Thank you

[@christophersanita5980]

Hey, I bought and installed the product on my 2010 tundra v8 4.6 and it worked great for a year or so. But now the lights are blinking again, and it is stuck in limp mode. It pulled the code P2442 stuck air injection pump. It also pulled a code for the 8 cylinder so I replaced the coil.

[@Hewitt-tech]

Please give us a call Toll Free 1-844-307-7671 or email us directly at [e-mail] The P2442 is a Bank2 Air Switching Valve Stuck Open Code. If you did not install the block off plates you will need to get them installed and clear the codes again. If can verify that you do have the plates installed, this usually indicates the pressure sensor in that valve has failed. They can be damaged by continuing to drive the vehicle with the valve stuck open codes for a while before installing the kit. It doesn't happen often but the damage can also show up much later. There is also the possibility the sensor just failed but we usually only see that with aftermarket parts and not the factory Toyota sensors. We have kit add-ons for the sensors depending on which kit you are using to take care of this without having to replace the air switching valve. Give us a call and we can hep troubleshoot and get you what you need.

[@wolfewolffiewolflovewolf5193]

Can I use the gen 1 on 2008 tundra 5.7 … or do I have use the gen 2

[@Hewitt-tech]

The Gen1 kit (V54H) covers your vehicle. However, the Gen2 kit is a much better solution over the V54H kit for any of the vehicles that can use it. Please give us a call if you have any questions. Sorry for the very late response.

[@andrewgaza9764]

How do u wire a original connector mine came off on driver side and the passenger side is different color wires do u know by any chance

[@Hewitt-tech]

You will need to email or call with the exact specifics of what you are referring to. We can help with pinouts or a repair pigtail but it is all year, model and engine specific.

[@andrewgaza9764]

@@Hewitt-tech where can I call you to or email you to and it's a 2008 Tundra 5.7

[@Hewitt-tech]

@@andrewgaza9764 [e-mail], contact us form hewitt-tech.com/store/index.php?l=page_view&p=contact_us, toll free 1-844-307-7671

[@andrewgaza9764]

@@Hewitt-tech thank u for the info I already ordered the bypass kit should come in tomorrow so I'm hoping that works cause I dont got power it dont go past 40 and that's the only codes popping up about the secondary air injection pump

[@LTTM]

After installing this kit, is there any problems with removing the two air pumps under the front passeneger fender? Just to clean up the engine bay a little?

[@Hewitt-tech]

With the Gen2 kit installed the air pumps can be removed. They are disconnected at the air injection control driver and their connectors capped off at the Gen2 unit.