p0420 Catalyst System Efficiency Below Threshold

[@baja-automotive]

For my P0420 tests I also like to compare the reaction time of the upstream 02 against the down stream O2. I mainly work on Toyota and Subarus (which use AFR for the upstream). 90% of P0420 codes (I encounter) are related to a slow reacting upstream O2 and /or bad spark plugs

[@Sean_Diagnostics]

great explanation! I would also check the spark plugs on wear. I once had a p0420 and did a test on the gas analyzer. It passed the test, so i checked the O2 sensor and noticed sensor 1 (air/fuel) switching alot and also the O2 downstream. I went on and checked spark plugs and they were pretty worn. I changed the spark plugs and did a reset of adaptive values. Since then i always check the spark plugs to be sure the computer is not compensating for worn spark plugs

[@MasterAutomotiveTraining]

Thank you Sean, you are correct, its always a good ideas to use a scope or visually inspect the secondary ignition system, to prevent carbon fouled cat.

[@RamxRamx-fw3gm]

@@Sean_Diagnostics a reset of adaptive values? Mine is showing a P0420 but I really don’t think it’s the cat. Maybe my o2 sensor?

[@markwhitaker7887]

Best video I have seen using a scanner to diagnose a P0420.

[@ubuntumike5794]

Absolutely

[@MasterAutomotiveTraining]

Thank you buddy!

[@MasterAutomotiveTraining]

@@ubuntumike5794 Thank you buddy!

[@xr77exo]

I have a 2009 Toyota Toyota Camry LE, my car has that oil consumption problem. I took it to Toyota. They said they could fix it. I paid still eats up oil. Now, I’ve got the primary DTC … catalyst system, efficiency below threshold (Bank 1) Plus additional diagnostic trouble codes P2237, P2238 I’m planning to change the sensors up stream and downstream plus purge valve . I am no mechanic, but I’m willing to work on my car. So when you said that oil consumption leads to catalytic converter failure. Well, I hope I can fix my car hopefully avoid changing the catalytic converter. Thank you for the video. It was very insightful informative and you know what you’re talking about. I appreciate that. From San Antonio, Texas…Ty👍🏼

[@baconmunchers629]

... Speaking of analyzing data provided - when I hear someone explain something complex in short, precise, and easy to digest terms, it proves that the person truly understands the subject. It also says that you too had a very good Instructor.

[@jasonfestner9242]

This guy gives awesome information. A little too fast for us limited do it selfers, but definitely worth rewinding over again.

[@MattHerold-pv8qb]

Great video Oscar! Love your explanation of examining the root cause. Seen many shops load the cannon without any further evaluation. Misfires and fluid consumption are the main killers of catalysts. Also, amazing what's capable with dongle and a phone!

[@MasterAutomotiveTraining]

Hey Matt, thank you for your kind words. Sadly to many shops and techs will just throw parts without first analyzing whats the root cause. I highly recommend the topscan, very powerful tool.

[@weldingjunkie]

Nice job Oscar. I was just trying to explain to somebody the other day about this being a pro tool versus a non-tool. This does keep up with even the highest end scanners. You cannot beat this for the money.

[@MasterAutomotiveTraining]

Thank you my friend. I always say gear doesn't buy skill lol. Im very impressed with the topscan and I tell everyone its my techs go to tool.

[@georgepetrillo7316]

Very thorough on diagnosing a bad cat. Is it good to go one step further and use a laser thermometer and check temps before and after the cat?

[@baja-automotive]

Great job! I’m going to steal this explanation for my channel

[@MasterAutomotiveTraining]

Go for it! Just pass on some recognition 😉

[@LA_Commander]

Wow great video! You broke it down so simple for the average guy to understand.

[@MasterAutomotiveTraining]

Thank you for watching, glad I was able to help!

[@jerrychan1471]

Best explanation that I've seen for analyzing the PID data, thanks!

[@rickybailey7123]

U did a hell of a job showing how 2 do it if anyone says it was bad they have no idea about cars truck or for that matter any thing They're just r***** thanks again !!

[@MasterAutomotiveTraining]

Thank you for watching my brother and dope comment!

[@sollykhan2385]

Thank you for this great tutorial, broken down in an easy systematic way, please post more wonderful tutorials 😇

[@FranciscoJavierOutdoors]

thanks for this video bro!! i just rebuilt the engine on my moms suv and it also suffered from oil consumption prior to the rebuilt (we bought the suv used). now that i rebuilt the engine, i started losing a bit of power once the engine is on the road after 15-20 minutes. Nothing drastic, but definitely noticeable. I got the P0420 code, and my dumbass cleared it cause I knew i had to probably replace the cat now, but it never occurred to me that it could've been going on ever since the oil consumption. i have a scanner and am going to try out your live data test, and also look into that scanner you're using. i like how it had way more detailed diagnostics.

[@Jursaw]

This taught me a new way of testing cats. Thanks for taking your time for sharing your knowledge with us!

[@MasterAutomotiveTraining]

Glad it was helpful! Thanks for watching.

[@AAB371]

Good explanation. Keep the videos coming

[@MasterAutomotiveTraining]

Thank you for watching more to come!

[@ysitrim88]

Yes more technical videos!

[@alexreis5530]

I think I got it …it’s little be advanced for me ,,,I gonna study it more ..Thanks again appreciate

[@MasterAutomotiveTraining]

You got this! Look it over once again, and test it out!

[@phishhu]

Fantastic explanation with loads of details. Thanks!

[@MasterAutomotiveTraining]

Thank you for your kind words and support.

[@michaelrodgers9200]

I have a 08 ford escape v6, after swapping engine and granny. Had a backfiring accouring for months until today. I did a smoke test in the evap and found out bank 2 fuel injector was throwing the smoke out from the machine. I'm gonna replace the o rings tomorrow. Hope it fixes my issue with p040 bank 2 running lean and 02 codes.

[@MasterAutomotiveTraining]

Hopefully it didn't cause internal damage of the Cat with the excessive fuel consumption.

[@MarzNet256]

Cool. I had an intermittent P0420, which turned out to be an exhaust leak at the Manifold donut gasket. Worn engine mounts also added to the leak. A new gasket and mounts fixed it (use OEM for these). Downstream O2 sensor was reading lean. Car is a 2006 Matrix 4WD with 225k miles.

[@MasterAutomotiveTraining]

Very nice! That's a common issue, great catch. Thanks for sharing this helps other Incase they run into a similar issue.

[@NeverGiveUpYo]

Cool video! Usually a leak, sensor, gasket or a bad cat cause this issue.

[@anthaneilkellier6739]

If we should go the route of replacing the Cat is a ECM reprogram necessary?

[@jdubjdub645]

Hello! Love all of your lessons and have helped me with ase tests. Was wondering if you had an ase 2 automatic transmission course…

[@bettowin]

Great informational video. My 2005 Honda Civic has the same code and from your video I realize my CAT may be toast due to a very small head gasket leak that likely caused the CAT to overheat due to the coolant and tripping the code. 🤞that it's the O2 instead.

[@paulnewton943]

Nice informative video. My question is, which tops can tool is the one in this video? Thanks

[@mikedavidson2117]

Hi do you believe in using a digital laser temp gauge the one you point or a infrared camera with temperature readings

[@MasterAutomotiveTraining]

It's a good method or even using a thermal imager, you just need to test many known good cars to have an idea of what's good vs. what's bad, to then apply to your diag.

[@lukeschlabach4992]

Great job man

[@MasterAutomotiveTraining]

Thank you for watching.

[@AboHadi2007]

Stop by step diagnosis great job

[@MasterAutomotiveTraining]

Thank you!

[@davidvaladez1512]

Thanks for your time and experience…Can the PO420 code also be cleared by removing the cat and soaking it in soapy distilled water for a day then put back in for the DIYer trying to save money …?

[@humbledhands]

Maybe could work. The paint thinner in gas tank worked for my 2000 Toyota Camry. Didn't even have to take off 🐈 cat

[@warfarewar8206]

Would love more videos like this awsome video

[@jcmx0180]

Hello I have that code right now and my truck in running rich. I have a 2015 QX 80 The first code I received was a P4030 So I was told to change the O2 sensor which I did. Then the code went away for three months and came back. Then a P0420 So the mechanic says change the cat without doing any kind of diagnostics. What would you suggest ? If do have to get a cat , do it have to be oem ?

[@MasterAutomotiveTraining]

Its always best to go with a factory CAT. Has any testing been done?

[@kellygibson7299]

Great vid man. Just found the channel

[@MasterAutomotiveTraining]

Welcome aboard! Thank you for watching.

[@SpecializedAutoMaintenanceServ]

bien facilitoooo when you understand well hopefully soon i get that.... great video

[@MuhammadNadeem-st8pd]

Hi Man, I had misfire issue in my Toyota corolla 2008,I took it to the mechanics and he said you need to change coil in C3, but they issue was still there and then I changed two more. Few days later check light turned on and we changed the pre cat oxygen sensor. The mechanic stripped out the oxygen sensor and then we had a bit of issue but a thread guy fixed it (code was p0420). After a driving for a while the engine light is still there and code is 0420. I’m wondering is this a cat issue or something else what do you suggest? the mechanics are just ripping money here and just replacing parts

[@ArchiePhillips-fb1oi]

Hey man I have a 2014 Chevy Cruze the shop replace cat and o2 sensor and code came back did they do the repair right

[@kcsvantasticvoyages9729]

I like it but did new cat fix codes?

[@MasterAutomotiveTraining]

Hasn't been replaced.

[@AlfredoTigolo]

I've been dealing with this P0420 error for years

[@osmarpena2484]

Good stuff, I do have a question I have replaced both cat and o2 sensors, it had a multiple miss fire , and I hear while accelerating a big bang coming from the cat, also I have a small leak from the exhaust connector where they joined , but a mechanic told me that that is not the issue because is not between the o2 sensor , is this correct? Thanks

[@EdgarOchoaPalma]

hi, what if i have p0420 on my 2011 honda accord 2.4l engine but my cat monitor on my scann tool is green for good can it still be the Cat ?

[@MasterAutomotiveTraining]

The green light simply means that it ran the test on the CAT system. Even if it fails it will still show complete. You'd need to look at Mode $06 to determine if infact you need a new CAT.

[@robertmobileman8304]

good job man , thanks

[@MasterAutomotiveTraining]

Glad it helped, thanks for watching.

[@ubuntumike5794]

That was brilliant man

[@mackendw]

so to summarize, spark up the scan tool, monitoring the O2 voltage on the rear sensor for the bank having the problem. watch for a fairly steady state of ~450 mv. throttle bursts should spike and return back to this state if working properly. if there is an exhaust leak at the cat itself, should repairing it even be attempted? or just replace it? just finished monitoring both side cats/O2 sensors....drivers side (bank1) is running way lean (~ 118mv) pretty solid due to the leak in the pipe going into the cat.... passenger side is holding at ~445mv on the downstream side. (normal)....

[@Blblazer1210]

I'm in the exact same predicament. I had the oil consumption test. They suggested replacing the engine. So got a remanufactured engine. Now getting P0420 code. They are saying the warranty won't cover it after covering part of the engine cost. Does this sound right? I mean the cats bad because of the engine.

[@ysitrim88]

Very good info my friend!

[@MasterAutomotiveTraining]

Glad it was helpful! Thank you for watching.

[@ysitrim88]

@MasterAutomotiveTraining Np and i subscribed to your channel. 😎

[@robertfrancisco1193]

good job Oscar!

[@MasterAutomotiveTraining]

Thank you for watching!

[@bassdee10]

Great video, thank you!

[@codyshaylyn]

Great content as usual

[@MasterAutomotiveTraining]

Much appreciated,thank you for watching.

[@nickayivor8432]

Oscar Gomez Master Automotive Training Enjoy your 4th of July with all your family around you Brilliant video tutorial outstanding 👍 WHIP SMART, Oscar Gomez Master Automotive Training From Nick Ayivor from London England UK 🇬🇧 ⏰️ 7:04AM Good Morning 🌧 and more 🌧

[@MasterAutomotiveTraining]

Thank you my friend! Your support is amazing!

[@milankodjurdjulov8210]

Hello, I watched your video, very good information. My situation is this . 2009 Corolla 1.8 . No original cat problem only a unrepairable exhaust leak that was bothering me because I could smell it inside the car at times, so I thought I would repair it I was told that it is not repairable. Then I purchased the front cat's without resonator. My mechanic installed it as no resonator but was not loud anyways. My problem is this after about 50 miles of driving my engine light came on. I took it back, my mechanic found code PO420, low efficiency reading. We reset the code and we were told by the seller of the cat to drive it or use a premium fuel , I did. It was good for another 60 or more miles the engine light same code. Seller says unit should be good. What suggestions do you have ??? The car is running good and fuel mileage looks as was so far. I can't stand the engine light. Mike

[@Djc244]

Hey I had a Tahoe with a returning P0420 code, previous techs had replaced cats twice on it, I got it and could not condem the cat, but they wanted me to put another cat on. Code returned. Later found that coolant temp was only getting up to 180F now matter how long it ran. I put in a resister to the coolant temp connector and verified computer could read 200 degrees, it was able to, tested the coolant temp sensor and found according to the temp to resistance chart. Also passed, so I recommend thermostat customer declined and left. My question is, if coolant temp doesn’t not get up to temp how can that effect just one bank and cause the p0420 back? It’s driving me nuts lol

[@JOHNPHUFNAGEL]

I can't see how a coolant temp issue would cause a single bank issue. was it California emissions, possible that you were using the wrong cat? is it oem cat? I have seen new aftermarket cats set 420 code

[@Djc244]

@@JOHNPHUFNAGEL yes I checked all of that,it was an aftermarket cat, but the last two were OEM.

[@MasterAutomotiveTraining]

It's called time to temperature. On my previous video of the 3 PIDs I speak about it. If the ECT takes too long to warm up the monitor won't run or run at the wrong time causing a false DTC. You can also read that same info in service info it's part of the code setting criteria. Great catch.

[@Djc244]

@@MasterAutomotiveTraining holy shit must have missed that. I sincerely hate a vehicle leaving that was not properly diagnosed. I NEED it fixed. Thank you.

[@robertholmes2295]

@@MasterAutomotiveTraining I'm currently using HP Tuners to do the same tests, but the supported vehicles are limited. I did notice on a 2014 Silverado with a 5.3 L83 with a bad thermostat that almost all emissions tests fail to run until the target coolant temperature is reached. I am assuming that most systems are the same. Do you have an affiliate link to the scanner you are using? dragging a laptop out to diagnose is very cumbersome, and a huge pain in my ass.

[@DK-vx1zc]

excellent! clearly explained

[@KP-Pro2A]

I have a steady bank 1 and bank 2 sensor 2 voltage of .75 volts at idle and also under steady throttle at various speeds. The only time I see the voltage drop is with foot off the throttle deceleration. My a/f ratio sensor is pretty close to 1.0 lamda all the time, but is reading negative mv readings all through the throttle range. I’m having both 0420 and 0430 codes…. No noticeable oil consumption, New plugs/coils, and also fuel Injectors. Those were all done for regular maintenance high mileage, 2015 explorer 3.5L. I’m having trouble believing both cats went at the exact same time. Wondering if I should be investigating for other issues. Exhaust leak? I did check temps with an infrared thermometer on inlet and outlet of both cats- there isn’t a significant difference between inlet and outlet temp on either cat. I know outlet should be hotter….. Any thoughts from you would be greatly appreciated. I’m planning on keeping the car as long as I can, not the end of the world if I have to change them,I just don’t want to change them, and still have the same problem after I spend the money because I didn’t look deep enough before I did the work.

[@johnjauregui3528]

How does ethanol affect ECM/PCM fuel trim calculations? Does it require the same 14.7:1 ratio calculations or some other ratio? If so does the ECM/PCM sense whether the fuel is ethanol or gasoline and use a different ratio for ethanol? If the ECM/PCM assume gasoline is used and does not adjust for the use of ethanol what is the impact on air/fuel calculations and fuel trim outputs? How does this affect scanner outputs, rich, lean, etc.? Is there a YT video that addresses these questions? Bottomline: How does the ECM/PCM adjust for these two different fuel types with different optimum air/fuel ratios, or does it not, and what are the impacts on scanner readings and diagnosis? Again, is there a YT video that addresses these questions?

[@SaintFrmThaRaq]

I got a question bro.. i had this same code on my 2008 Dodge Avenger. It was time for me to get my emissions test done, so i bought a new Cat, and both oxygen sensors. I got them replaced and the code went away and i was able to pass the emissions test. About a month had passed and now the code is back. I dont know what to do at this point

[@LordOuzin]

Leak test the exhaust

[@SaintFrmThaRaq]

@@LordOuzinthanks. I’ll give it a try

[@amandasmozski]

Question for you, I have a 2013 XV Crosstrek that continues to have intermittent p0420 after changing the CAT with a Magnaflow NEW cat and 2 new 02 sensors. Why would the code continue to turn on and off?

[@thecircleoflove7557]

Have you checked your spark plugs? Or inspect your exhaust for any leaks?

[@amandasmozski]

@@thecircleoflove7557 Spark plugs are

[@EdgarOchoaPalma]

how do i find out what ruined it. how do i know if my sparkplugs or my fuel rail ruined it. ? seems like my long term fuel trim is running rich at -15.6 my short term fuel trim is -3.6

[@MasterAutomotiveTraining]

Based on your fuel trims the vehicle is running rich and the PCM is trying to reduce the fuel thats why you have a negative fuel trim. You'd need to run tests to determine what is causing the rich condition.

[@EdgarOchoaPalma]

@@MasterAutomotiveTraining . like what kind of test should i do. I m thinking my fuel regulator might be bad but dont know how to test it yet. also I want to look at my injectors and would love to test the. would also like to know what the specs are on the injectors.

[@JR-kr1lv]

If you have exhaust leak on Honda crv 2.4L and passed twice with Catoclean in a bottle, bought another one and didn't go off. Did blow exhaust gasket from son driving and it has scrapes on exhaust, so I think from going parking and bottom out caused a small leak that gotten bigger over time, I thought of wrapping tape over. Or aluminum foil to seal up then tape it. Any subjugation ??? It does go through oil when he drives from hard driving, me driving, no a lot of oil per change, justabout 1/2 in 5,000 miles at 155,550. It runs great.

[@ArchiePhillips-fb1oi]

Which state are you located in do you have a work shop you wanna put out

[@mr_mnky]

Wouldn't negative fuel trims indicate that the car is decelerating, since the pcm is removing fuel instead of adding it?

[@MasterAutomotiveTraining]

On decel it goes into OL-Drive and trims aren't being monitored by PCM.

[@mback12000]

You may misunderstand... trim is not "all" of the fuel, it is the small amount added/subtracted from the base fuel map. Base plus trim equals total. There are also long and short term trims, I'm just simplifying.

[@scyth625]

Could a software update cause a p0420. My scanner is telling me there is a tsb for a software update for this code.

[@MasterAutomotiveTraining]

Yes it's possible

[@scyth625]

@@MasterAutomotiveTraining Really appreciate your videos. I’m a retired fleet tech. I have some catching up to do.

[@drock00013]

​@MasterAutomotiveTraining you say in the beginning that it downloads the software is this scanner able to update the ECM to the latest GM software revision? I read a similar TSB I'm assuming with update was needed because the old software was causing this code in tens of thousands of cars. My 2012 traverse is doing it

[@JimDaniel-hu9ip]

You Are Awesome!!!

[@MasterAutomotiveTraining]

Thank you brother!

[@alexshatner3907]

@@MasterAutomotiveTraining I have a P0420 code on my 2007 Toyota yaris but no engine light, I only found that out through Scan tool, what do I do because it is not smog ready, it given me the yellow exclamation mark rather than the green one. what do I do????could be I just have drive a few miles for it to go through the cycles, since it is only yellow and there no check Engine Light?

[@MasterAutomotiveTraining]

@@alexshatner3907 There is a code set but no check engine light on? If this is so, then it will pass an emissions inspection as long as the readiness monitors are set to complete.

[@alexshatner3907]

@@MasterAutomotiveTraining So do you think if I just drive it a few miles so it goes through it cycles, the Yellow check mark on my OBD will turn green? Cuz I wonder if I take it here in california to get it smogged their computer may say not ready yet

[@alexshatner3907]

@@MasterAutomotiveTraining Thank you brother for response blessings

[@rick343]

Clicked on the video hoping to get some insight on my wife's 07 Honda Accord, been getting an intermittent po420 for 5 years, the cats aren't cheap for these cars, so I'm glad I didn't break down and get one at the first sign of the po420, car runs great, haven't had any other trouble codes, just don't understand why or how this code pops on for awhile, only to go back off for awhile, if the cat is on its way out, why has it kept doing this for 5 years, I just don't get it

[@MasterAutomotiveTraining]

You're suffering from a weak cat. During the entire video I explained how to test it to know if it's the cat or an input sensor. If you follow the same steps you'll be able to determine the true cause. Curious what type of insight did you expect to see?

[@rick343]

@@MasterAutomotiveTraining I was hoping to understand why her car has had the intermittent 420 for so many years, I guess I did get some insight, I just didn't think that a cat could remain in the weak stage of it's life for so long, thought that maybe there is a problem I hadn't heard of yet, meant no offense to your video, you obviously know what you are doing, and I always like to listen to everyone's perspective, every time her engine light comes on because of the 420, I think is it finally going to go out, but after years of this, you begin to wonder, is there something going on I'm not aware of, I reckon it's just living on the brink.

[@mechanicmike311]

Have you had a new car block you out of the system ? You can pull codes but no live data ,no bidirectional just Codes.

[@robertmobileman8304]

It must have asecure gateway man

[@MasterAutomotiveTraining]

Not yet, you'll need to get your scan tool registered with Autoauth and also get your VSP for the new changes.

[@MrSnowplow2]

I have a 2013 ford escape with a 2.5L. It had the p0420 so the cat/manifold was replaced along with both O2 sensors Even with all new parts I’m still getting the p0420 code any suggestions?

[@eliezerramosjr1017]

Make sure they didn’t out aftermarket cats cuz most cats don’t like nothing but OEM.

[@MechanicalFredd]

This was good. Thanks.

[@MasterAutomotiveTraining]

Glad you enjoyed it!

[@joedirt1712]

Thanks

[@kennybaker5140]

Make a video on topscan please

[@mikedavidson2117]

Great video a lot to remember if you don’t deal with cat codes a lot but it makes sense so I saved it mode 6 is very powerful can you do more micsig scope classes

[@FORDTECH313]

Good video brother

[@EdgarSahidPerezRosas]

I have a Honda oddessey 2002 I replaced the cat because I had a po420 3 months later I got the same code I took it back to the shop and luckily they replaced my cat once again and 3 months later I get po420 again but this time it comes off sometimes by it self and comes back on at this point I don’t know 🤷‍♂️😢

[@eliezerramosjr1017]

That happens when people put on aftermarket catalytic converters so check if they didn’t cuz Honda likes OEM cats.

[@AirArmsInc]

Why would it do that if my cat is new?

[@amokoikaw1]

Right on ! Nice!

[@s3vR3x]

Hey man, do you have a shop where you do smog diagnosis? I am local to you and i have been playing parts cannon with my 94 jeep 4.0 for 15 years. im about to throw in the towel. Id love to see if you can diagnose.

[@MasterAutomotiveTraining]

Of course man, we are Master Auto Care. 9233 Archibald Ave., Rancho Cucamonga, CA 91730. 909-493-1855, give us a call to setup an appointment and we can definitely help you get it fixed.

[@sergeyskots]

Where can I aquire that device

[@mghuertas]

Awsome info thanks ❤

[@hoaxs1939]

Thank you for covering MODE 6. 😤

[@rommeltolentino5954]

2005 Toyota Corolla le, brand new 02 sensor upstream and downstream, brand new catalytic converter CARB California, brand new battery, brand new spark plug,anyway, no codes and always not ready the O2 sensor i failed in the smog check. Drive cycle is like 2000 miles now.

[@TalyerMotorsph]

Hi Oscar jw what’s the upstream and downstream 02 sensor called in tapdon phoenix read data? Thank you

[@islandbeaches395]

Easy Fix P0420 Replace the entire exhaust system fixed the lean condition to much air/fuel

[@MasterAutomotiveTraining]

How would you justify an entire exhaust system replacement to a client? What tests did you run to confirm a lean condition?

[@Mr.G626]

subbed!

[@ottoantonionolascoestrada1813]

You can run on some toyotas the cat monitor , zero mph

[@MasterAutomotiveTraining]

At idle?

[@carlosm1232re]

12:52 I could it figure it out it was the cat

[@1Bohimyme]

What is so funny is everybody knocks the big scanner but you see P0420 /p0430 cat codes is vacuum leak first most evap purge solenoids will go bad and set without a evap code, same with an intake leak most cars you do not get fuel trim lean bank 1/2. But what the high dollar scanner does is allows me to test the circuits to where the hand held on your phone does not. They have special test and activation test to where almost all generic scanners do not. Now we are going into problems with right to fix currently all Mopar and Nissan above 2012 requires your scanner to be registered or all it will do is read the codes more manufactures are going that way. That is why it is called diagnostic fee.

[@MasterAutomotiveTraining]

You're saying a P0171&P0174 is the cause of a P0420? My Topscan also has bi-directional, also has manufacture specific data not just generic. Won't you don't know is that EPA requires EVAP as mode 08, no matter how expensive your tool is. I again say the tool doesn't make the tech, the knowledge level does.

[@1Bohimyme]

@@MasterAutomotiveTraining I am saying few manufactures have an evap purge solenoid monitored for flow no flow I own a shop and mechanic 30 years and have replaced 500 better purge solenoid over no evap code ,but have p0420 why because it is a metered leak when the solenoid goes bad most manufactures have open/short code for purge not for bad internal valve failure. At best most manufactures you may 1 in 20 get a lean bank code that helps you without a physical vacuum check failure. Next most evap purge sensor is monitoring the valve solenoid at the canister and tank not the purge solenoid. Basics first and vacuum is still a basic that most techs overlook and DYI peeps.

[@PL-Construction]

​@1Bohimyme my 2017 chevy has a jasper engine now with no DOD. It is showing sensor 1 bank 2 dropping volts to like .06 while the rest are running normal. Any ideas?

[@1Bohimyme]

@@PL-Construction misfire counters? even low ones like 2-50 not enough to trip misfire code?

[@PL-Construction]

@@1Bohimyme ill have to look it up again. In only getting p0420 code. Truck has a rough idle but not a real loss of power unless CEL is on. I put 02 spacer and reset code CEL and it's done better but still has rough idle

[@kingscairn]

There are cat cleaners out there - this cat failed because of oil consumption clogging - cats probably still good

[@andviv]

So all of that to end up with the regular solution for the P0420, replace the car? I was hoping to finally see a video that shows something new about it. Conclusion: P0420 or P0430 simply mean new cats. End of diag.

[@MasterAutomotiveTraining]

Go for it, and when it's a bad HO2, exhaust leak, you'll learn that you should have tested it out instead of throwing a part at it. Good luck tho.

[@eliezerramosjr1017]

@@MasterAutomotiveTrainingThats why we are a dying breed cuz of guys like that ☝🏾 that love loading parts cannon and hoping something sticks. That’s sad, test don’t guess.

[@MasterAutomotiveTraining]

@@eliezerramosjr1017 Sadly that is the most common mindset, the microwave era. Quick fix and approach, if that doesn't work then complain about how they were taken advantage of.

[@airborneranger-ret]

Liked and subbed

[@frankwrenchman4573]

Data data data 😊

[@MasterAutomotiveTraining]

Coming up! 😃

[@brianwatt558]

Don’t change the cat lot of time it’s the 02 sensor they got a lot of fake sensors I both one off Amazon and it didn’t work got one at real car part store and code clear after I drove it for a couple of days !!! They say cat because that’s where the money at !! Cat probably cost you thousand or more o2 sensors probably cost you 75 or 100 !! They be getting over big time !! I know because that’s what the shop said but what they didn’t know I just both new cat 2 front and back trying to hustle a brother!! SMH and that cheap gas they sell us might have to put some cat cleaner and you good to go !!!

[@MasterAutomotiveTraining]

I tested the HO2's in the video, proving they are working and also used the PCM internal tests to confirm they work. It's the CAT.

[@bob-pr8ye]

My kia keeps getting codes for catiletic converter...cleared, doesn't come back. so sick of carbon build up on everything! Using cleaners and it ticks...... Its a POS !!

[@MasterAutomotiveTraining]

The GDI's are known for carbon build up. Make sure not to idle when not needed, do your oil changes every 3500-4000 miles, and engine flushes often.

[@Huayi-x3p]

can someone who knows what this guy is talking about make a lil bullet point list on what tests to run/pull up and the respective criteria, and the reasoning behind it? Its a lil hard for me to follow cuz he only talked about what to look for but not why, sometimes

[@MasterAutomotiveTraining]

I'd like to know more, what do you mean by why?

[@Huayi-x3p]

@@MasterAutomotiveTraininglike why we wanna check for the fluctuations in the charts, what does the fluctuations or lack thereof indicate in the system

[@budpimpinz]

Fixed 420 code with a fan clutch 04 trail blazer

[@MasterAutomotiveTraining]

Yup, time to temperature. We also fixed one with a bad stop light switch, PCM wouldn't enter full testing as it thought the truck was being stopped.

[@GodsHerosGodsHeros]

🟥 ⚜️ 🟩 Honneur et fidélité. Thomas Ghast 👍 unglaubliches Video, danke mon adjutant 👌 thank you sir ! Adios y vaya con Dios ! 🙏

[@maltesemike9114]

😅😅more like gone grab my taco n let's eat fstzzzzzzz

[@RamxRamx-fw3gm]

Man , do most mechanics do all these test or just tell you you got a p0420 code and charge you for a new cat? The costumer seems to be in a disadvantage either way. We just want to find an honest one. Ok

[@MasterAutomotiveTraining]

I don't understand your comment

[@RamxRamx-fw3gm]

@@MasterAutomotiveTraining seems like a mechanic could just show you the p0420 code and you gotta buy a new cat. I think it’s awesome that mechanics will go out of their way to find it something is really needed or not

[@MasterAutomotiveTraining]

@@RamxRamx-fw3gm Lets see, I pull a code P0420, and tell you to buy a $2K Catalytic converter, doesn't fix the problem because of a faulty oxygen sensor. I'm sure you are going to nice and calm and say it's ok, that you made me waste $2K on something I didn't need and now I'll buy the $100 oxygen sensor. How would you feel in that scenario? It's based on your comment. You'd rather be lied to, waste money then have a technician properly test and pinpoint a fault?

[@RamxRamx-fw3gm]

@@MasterAutomotiveTraining ok

[@LOLONO666]

it's easy to find out by yourself ,,check engine is on and you can buy a obd2 scanner for cheap

[@caseyparkhurst226]

I have been having problems with My 2018 Hyundai Elantra Chacon SEL with a PO420 Code. I have been trying to fix the problem and clear the code so I can get it fixed so I can sell the car. The car has 225,000 plus Miles on it. When I bought the car 2 Years Ago, it had 86,580 Miles. I am the 3rd Owner on the car and I drive for Uber.

[@GasPipeJimmy]

Dick

[@bakryahmed9178]

Bla bla bla for five minutes, and you haven't started explaining the code yet.

[@MasterAutomotiveTraining]

Well, I started explaining the proper process at :50, I believe you wanted a video saying replace this part for this code. I'm not a parts changer and don't teach that, since that's what you want, I'm not the channel or teacher for you, best of luck with parts changing.

[@abdulali46]

That was a lesson Oscar i been watching your useful videos for a while and they are very impressive ​@MasterAutomotiveTraining

[@ibrahimwaheed987]

Comparing it with Phoenix Max is not correct

[@MasterAutomotiveTraining]

All the knowledge in this video yet, you focus on that comparison, well ok. Good to know.

[@damon-t4l]

@@MasterAutomotiveTraining😂😂