Honda Civic EVAP Leak P1457 (no visible smoke)

Small EVAP system leaks are sometimes very difficult to find and this one was a prime example of that. Watch to the end where I show an alternative way to locate the source of the leak.
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Video breakdown
- how to locate the EVAP service port 1:10
- purpose of the EVAP purge valve 1:41
- how to use the flow meter of an EVAP smoke machine 4:03
- lift safety 5:50
- how to locate the EVAP vent solenoid 6:01
- how to close the EVAP vent manually 6:48
- how to determine how large of a leak the system has 8:20
- why you should not continue to apply smoke to an EVAP system without knowing the flow rate of your smoke machine 10:09
- beginning of the smoke test 11:00
- diagram and overview of a typical EVAP system 11:37
- EVAP purge valve (purge solenoid) test 13:51
- gas cap test 15:47
- "keep looking!" 16:48
- switching to different lights and why 17:47
- why we take the valve out of the service port
- bi-directional scan tool test of the EVAP vent solenoid 22:21
- why pinching off an EVAP vent line is not 100% accurate 24:00
- relocate the smoke machine to the fuel filler neck 27:15
- camera shut down and EVAP leak found using soap and water 40:00
Other EVAP videos I've done
• EVAP System Testing
For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdanner.com/join-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

[@KKFan9]

I want to show this video to my customers when they say to me "Well can't you just plug the black magic box in and tell what's wrong with my car? Isn't that what it's supposed to do?" This video is a perfect example of what we as mechanics sometimes have to deal with that non-mechanical people just will never comprehend. Wonderful video Danner!

[@xjssts7127]

I own an auto repair shop and I feel u, that's so true, customers have told me that so many times.

[@knock904]

Well Said Bro

[@VanCleveWalkingStick]

I normally wouldn't watch a video this long, appearing that a solution couldn't be found. But since my EVAP leak is driving me crazy and seeing your perseverance paid off, I finished the video. I guess patience is virtue though very testy. Thanks for the lesson.

[@jasonmcnamara2079]

lessons i learned 1. must remove schrader valve 2. if no smoke obvious, pinch off hose to seperate front and back 3. once you work out which section of vehicle, spray soapy water on stuff 4. remember to check fuel cap 5. inspection camera may be useful 6. if you cant find leak, burn car to ground

[@Ashroyer86]

Move fuel cap to no.1. A lot of cars have a specific code for it.

[@ASEWorldClassTech]

best comment just please don't jump to step 6 if customer says the have a evap code

[@jonnijames]

Im struggling to get my head around the purpose of having the charcoal canister which is to "COLLECT vapours, yet theres an open vent valve , how does it not just go out the vent valve? the magic of the charcoal holding the fumes in?

[@Okie-Tom]

jonnijames, in the perfectly working system the vaporized air from the tank goes into the charcoal canister and is forced through the charcoal which soaks up all the fuel vapors before it gets to the open vent! Then when the engine computer wants to burn those vapors it will open the purge valve, allowing the vapors to be sucked out of the charcoal canister into the engine to be burned. Then the canister is ready to start the process all over again. Hope this helps! Tom

[@zbynekm2918]

@@jonnijames Spot on explanation from Okie-Tom, just please keep in mind that some vehicle owners like to "overfill" the fuel tank, which than ruins the operation of the charcoal canister.

[@ccmtn8912]

I enjoy seeing real life scenerarios on coming to a roadblock and overcoming those road blocks. This is what makes your videos unique. Beeing able to see the struggle and the achievements at the end. Keep it up Mr. Scanner Danner

[@DonBMW]

Wow! Just wow! Great video and I watched the whole thing. Lesson: patience pays off and a $1,000 smoke machine is nice, but a $2 bottle of soapy water is also your friend. Noted! :-) Great work gents!

[@teddydunn3513]

Soapy Wooder is all you ever need

[@Lonewolf3165]

FYI to you guys and people viewing this: On Honda/Acura vehicles a P1457 evap code will always be on the canister/ purge side of the fuel system. NOT the tank or cap or filler neck. Those parts will set a P1456 or P0440 code. P1456 is for the tank side. P1457 is always the canister/purge side. So you can eliminate checking out the wrong side of the system by knowing what code you have. In this case it would have saved the time of pulling the seat to check the fuel pump seal and the time to check the filler neck. 38+years Honda Master Tech. Just trying to help.

[@ScannerDanner]

Pays to look up service info!

[@JCartagena8989]

Just had engine light pop on my crv. P1457 and P0420 any advice for getting it mocked out?

[@LtJAS]

I Used the smoker yesterday but misplaced the tapered nozzle. (Duh) . Where can I buy one online, please?

[@newbluerugby]

What about Toyota

[@Freepank]

Customers wanna complain about prices, but have no idea what we go through to fix some of these problems. Your videos are useful not just for students but also for a guy doing the work. Thanks.

[@supercoupe6288]

these are the type of video's we "you tubers" want. you did great and we got a lot of info.

[@onauto2345]

I am mechanic it very good troubleshooting thank you.

[@chris432t6]

Yes! Agreed! I liked the fact that it is (or seemed) un-edited and professional at the same time.

[@ScannerDanner]

@@chris432t6 thank you! Of course we edit all of our videos, but this was real time troubleshooting as every other video on this channel is. We show our failures and our successes and you guys will learn from both. Thanks again for noticing that

[@Chingonazo1]

This is the real way of learning. Priceless lessons. Thank you for making the effort of recording

[@ScannerDanner]

Glad you enjoyed it!

[@tverrettsr]

Best thing about this video is you never gave up!

[@xjssts7127]

You are a genius; I am an auto mechanic for 30 years.

[@randyarnold1368]

I know I am NOT a mechanic. It was so good to see a real mechanic's frustrations and that makes me feel better about my failings. As I tell my wife 'I am the definition of Murphy's Law'. Thank you so much for not cutting the video and make it look like wizardry, I appreciate your honest transparency.

[@jimholahan8250]

Finally a video depicting how these things REALLY go, rather than a video where everything goes perfect. And it ends up being that damn valve after all. Your video has really taught me something and saved me agony. Many thanks!

[@ScannerDanner]

Thank you! I film live, so you guys get to see the true process I went through. I rarely will film a video that I already know what the problem is. Those are helpful too of course, it's just not what I normally do.

[@mikethrapp]

I'm new to evap diag. Im in a shop where I am thrown everything and have to figure it out myself cause no one else can. This has shown me that I'm on the right track. I did not know how to use the smoke machine like that. I always just filled the systems and looked for a leak. Lol. Now that you showed me how to read the machine and close of parts of the system I can exceed at my self training. Thanks.

[@mikethrapp]

Since I posted this comment. This technic has helped me a few times. Thanks.

[@TheDisgruntledMechanic]

Thanks Paul! Watching you do the "low tech" methods, to me gives a better understanding of how the EVAP works! thanks to Caleb also for the great camera work!

[@ScannerDanner]

he is getting good Mike, thanks!

[@lifewithassburgers8000]

ScannerDanner Had an impossible to find leak....5 or 6 shops gave up...ended up being the fuel pump seal under the back seat leaking....you ever seen that one b4?....love your vids

[@automedic9781]

LIFE WITH ASS BURGERS Just had one of our guys put a fuel pump in and have in leaking out of that seal. It just kind of rolled itself over.

[@michaelpearce8661]

@@ScannerDanner I'm surprised that you didn't say suggest this video when I ask you about my problem of a leak evaporation from a faulty repair on a fuel pump replacement that a mobile mechanic refused to make his repair complete.

[@Jursaw]

Amazed on how much I learn watching your videos! I didn't fully understand how the evap system worked but after your drawing of the low tech way it cleared up the confusion I had

[@Blazer02LS]

Another great "light" for EVAP use is a cheap laser pointer. It will light up smoke that you can't see with a large flood source.

[@miclewis55]

You’re right …. they are fantastic .

[@jkbrown5496]

Makes sense. You get a tiny spot except where smoke causes dispersion. Maybe a colored LED if you needed to cover more ground faster.

[@frap6790]

Blazer02LS good tip!

[@RetrocarStyle]

That is a a great suggestion. Thanks. I'll use that next time. Hopefully I won't see one of these for a while.

[@Freepank]

Good idea I'm gonna try this.

[@treymusser4197]

Isn’t it truly amazing how often you this career humbles you? Next time I can’t find a tiny leak, I’ll remember what I learned here in this video.Great video Paul!

[@robbrobb2161]

Excellent video. I had just ordered a smoke machine from Amazon without a flow meter, i canceled the order. Thank you very much for taking the time

[@ScannerDanner]

That flow meter is key!

[@wyattoneable]

I watch your videos in there entirety. I'm normally in a hotel with nothing to do so everything is quiet and I can concentrate on what's going on. This one was difficult but it was a great lesson on using other methods to find the leak. And as you mentioned, a lot of patience.

[@jonbarfield4915]

Paul great video. I left you a message on your SD web page. I think you will like it. I don't know why anyone has not thought of it already. I know it will work, you are the man to fine tune it. Brother in Christ, you inspire people.

[@shinigamidaiko666]

I’m still trying to get a good understanding of Evap systems, watching this video you made it easier to comprehend and understand I can only imagine how great it would be to have you as a teacher. Thanks for all the info you put out. Soon enough I’ll be a premium member and get your book!

[@ScannerDanner]

Thanks Israel!

[@juliancanizales5817]

This is a great video. I watched many videos on Evap leaks but this one is the only one that takes you through all the possible location where a leak could happen and also the different strategies on how to find them...

[@kmanrl3112]

Once again, kudos to you sir! I feel your pain, been on many an EVAP wild goose chase. One of the craziest ones was a 2005 Porsche Cayenne V8. Turned out to be a cracked plastic line on top of the tank. I fought it and fought it about like you did here and once I removed the access cover up top was able to finally spot it with a mirror and a light. (One of the rare instances where Euro stuff cuts you a break with a better design, I wish domestic manufacturers believed in putting an acess hatch to replace the fuel pump!). I really appreciate your authinticity, as a carreer auto tech I can definitely say you potray an accurate account of what it is like to be in the trenches on a day to day basis trying to make an honest living. Please keep up the good work, we are all pulling for you and in this together!

[@ScannerDanner]

Thank you so much

[@aurels93]

thanks for keeping it real and walking us through the whole process

[@PappaDanTrucking]

great job sticking with it till the end and showing that it just takes time to solve the problem

[@sheli4141]

I don't press like on a lot of videos. Your videos are unique. You take your audience to real life situations and don't pretend to have all the answers on the spot. I admire your skills and teaching. Thank you Mr Danner. I've learned so much... Still learning. Stay blessed, you and the Fam.

[@ScannerDanner]

Thanks so much! It's funny because most people don't like this process. The channels with all the views and subs don't do things this way, and it bothers me sometimes that my videos don't get the same love. But then I remind myself that I'm not doing this for views and likes (though I want them). I'm doing this to educate those that truly want to learn. You've reminded me of the importance of that today so thank you so much again

[@bumblebeel5370]

Wow. I need a great mechanic like you that will work diligently to fix this issue. 👍🏽👏🏾

[@royrivas972]

This how I feel doing evap leaks. Quick tip you can check for vacuum at the tank side end of the purge valve to determine a good or bad valve.

[@rhkips]

This is one where a party fogger wouldn't have helped. Crazy! So, here's my theory: Most heated haze generators (different from fog generators) have about a 5 micron particle size. 0.010" is equal to about 254 microns, so in theory, you should have seen smoke. But what if that 0.010" leak is distributed over a wide area? And what if that wide area also has lots of twists, bends, turns and debris (rust) in its various paths? Now all of a sudden your 5 micron smoke particles have to navigate a maze of channels that could only be 10 microns wide, in order to reach the atmosphere to be seen. It's very possible that most (all?) of them never make it out. The air pressure will continue to leak out, but the visible particles get trapped in the rust that created the leak in the first place. For reference, the average particle size for "gasoline vapor" is about 0.02 microns, which is why a 0.010" leak is actually substantial enough to warrant triggering the MIL. :)

[@alexandergonzalez2232]

love your dedication. you once invited me to take your classes, I would love to do so since you have educated me and saved me thousands of dollars in repairs and dealership tyranny and corruption. Thanks to Eric the car guy that is how I met you its a great service to humanity that you are expressing in your work and lessons , thank u scanner man.

[@alexandergonzalez2232]

Hello cherished Scanner man,I have been a mechanic in the 70's as a teenager working in garages in NYC where bosses commanded me to lie to the unsuspecting car owner to bring in the revenue for the garage, it did not sit well with me; I quit; decided to go to film school at NYU did some acting however my love for cars continued a deep seed inside me stemming from the love of learning and discovery, the car has integrated many sciences into one unit: the physics, chemistry mechanical engineering and now the science of transducers, potentiometers pressure sensors, air sensory perception, the car has a nervous system; so scanner man is a scientist and a doctor, for these magnificent machines, that are worth learning about and taking care of them because they have replace human and animal muscle making our lives better. The car is the only place I can feel freedom and closest to god, when and where the car takes me sitting behind the steering, wheel I can hear the sound of silence; this stillness is where one begins to re cognize the indwelt hero within. Scanner Danner you are the hottest real world Tech engineer scientist and professor instructor to the young and old mechanics, with very real world difficult cases to solve and investigate and an inspiring father which the world needs more of and a behind the scene mentor to me. The auto corporations have wiped out all the shade tree mechanics complicating a once extraordinary car with simple repairs into a brain surgery room with life support system for monitoring heart blood pressure and lungs. I was intimidated yet now I am motivated and see the fun in searching for the buried treasure inside the mystery of the cars illness and healing it extraordinary experience you transmit through your show. I have attempted to further explore hydrogen for the car when it collapses. You are a freedom fighter and you stand for truth, beauty and goodness. Eric the car guy , scotty Kilmer, Chris fix Brian & Spanky, the farmers of the Midwest who improvise and make things work with no resources; wellstech group, south main auto and many more, I hope to see in the great battle to come; you are all my real world heroes I will never forget your empowerment and generous mercy and compassion.Peace good fellows,Be brave just as you are!

[@mejiaaldo]

I think this is one of your better videos i learned that you don't need expensive tools to fix cars. Great video good job!

[@jeremieparker5703]

Soap and water for the win.. and smoke machine takes it face first to the mat...lol.. Awesome work Paul i dnt think i have ever seen u this frustrated before.. This vehicle was kicking your can but u pull it together my brother with a little time a patience and got it done.. Thank u bro for your hard work man.. this car would have had a whole new name after i got done swearing at it lol.. You Rocked Out on this 4sure..God Bless you family.. I hope this isn't your last evap fix not after the discovery of what soap and water can do..

[@ScannerDanner]

Yeah we shall see my friend.

[@IsshmanGarcia]

I HATE EVAP TOO! Im still chasing an EVAP leak for months! Great stuff as usual Paul.

[@mercpindi5522]

Did u figure out?

[@mercpindi5522]

I had mine fixed 3 years ago it came back again

[@OG_ArthurSlugworth]

It is always better to see things that don't go exactly as planned. When people make a video and everything goes according to plan it doesn't help as much. Seeing you think and go through everything helps me learn more. If you would have turned on the smoke and saw an obvious leak and video is over in 2 mins it doest help. Thanks for the video.

[@doughalcro2399]

I bought a used verus pro a few months back. That's what caused me to find your channel by chance. I've been hooked every since. Thanks again for the great vids, and descriptive discussion.

[@ScannerDanner]

Thank you Doug! You should check out my 17 part series on SD Premium on the Verus. There is a 14 day free trial so you should be able to watch the entire series and then cancel your subscription and you won't be charged. Here is the link if you"re interested. www.scannerdanner.com/scannerdanner-premium-chapters/scope-and-scan-tool-classes/snap-on-verus-training.html

[@gregoryfairchild2460]

Lol...I left a c clamp on a customer exhaust I welded. Called them for a follow up check and removed it..lol

[@bluor3713]

Ha, ha... smooth

[@shenanigans8apeach]

I've had this same exact issue, took me hours to locate as well. From my endeavor I have found that the smoke molecules break down going through such a small hole and that's after being mixed with oxygen. I noticed that less air pressure equals richer smoke that won't break down as easily. Yes it does take a little longer for the smoke to travel but it's WELL worth it to wait an extra minute. Makes it much easier. Oh and Windex is fantastic for bubbles ;)

[@rodzodrizzle1386]

Thank-you scannerdanner Hondas are notorious for evap leaks, great video

[@arpfre]

I felt your pain looking for this mystery leak. And I learnt a whole new system that my vintage cars don't have. Thanks for the video.

[@jairosendsit8667]

The first thing you said was dang the vent valve is pretty rusty 😂😂

[@minimotorman5931]

Lol, can't count the amount of times I've had jobs like that...staring right at the problem from the get go and never trust my first instinct. I'm now on a binge of your channel...

[@ericdowell818]

Just like electrical issues. check the fuse first.

[@puffdelude]

I myself am a license industrial mechanic!, love how persistent you are, and to let the public know what it takes to find a leak with tools and skills. ALL LEAKS SUCK!, lol but you found it congratulations and thank you for the educational video.

[@ScannerDanner]

thanks so much! I love hearing from people in other industries. Pretty cool

[@mrkttrdr2919]

One of the more entertaining Evap leak vids, lesson learned not to rely on expensive equip when the squirt bottle king doesn’t go with his tried and true method, not just for vacuum leaks, thanks for the vid

[@ScannerDanner]

The flow meter was key and a regulated air psi source. This is important missing stuff without the tool to do it for me. But you could rig up something like my bro used. No flow meter though. Thanks!

[@frugalprepper]

If you don't have a bidirectional scan tool can you just take a test light to ground and provide a ground to the control side of the solenoid OTC makes UV smoke solution and then you an use a black light and it shows up bright green. For us DIYers with no smoke machine that soap and bubble thing might help! I'll get a regulator and turn the air pressure way down and try it next time.

[@sailorbob74133]

FrugalPrepper's Garage & Garden just blow, most people can't make more than 1.5psi when blowing

[@ScannerDanner]

first, be sure it is ground side switched, not all are second, you need to regulate air pressure to around 1-1.5 psi and no more

[@ablackformula]

My otc smoke manual says to use an inert gas (n2) to pressurize gas/combustible systems. ScannerDanner do you always use shop air?

[@mharradine57]

ablackformula it's a good practice to but most don't. Not sure if anyone has ever heard of an explosion from using shop air.

[@shadowdog500]

Never thought of using the test light to activate the VSV. I use a 9v battery to activate the VSV, and a hand pump mighty vac (with built in gauge) to check the VSV and the line running to it for leaks. It is surprising how quickly you can track down what components are and aren’t leaking with just a hand vacuum, battery, and a golf-t. If you track the leak down to the tank or filler neck, you still need smoke to find where the tank or filler neck is leaking. I’ll do a video on this method next time I mess with a small evap leak. I do like the soapy water trick, never thought to use that to help track down an evap leak. Chris

[@gokblok]

Getting paid 0.3 to replace a line it took me an 1-1.5 hrs to find is most of why I left the Chrysler dealership. EVAP sucks.

[@skmc6915]

The PEN is mightier than the Wrench!

[@madmechanic7976]

Yeah what is with Mopar and the Evap leaks??..

[@cjmazdatech]

We used to set the scan tool to purge open, vent and by pass closed, stick a tire valve on the test port and add air until the fuel tank pressure was about 5 volts and spray the canister and vent valve down with soapy water. Found the leak every time in that same spot (worked at a Honda dealer in southern Ontario, Canada). As soon as I saw the video title I knew where the leak was 🤣🤣🤣🤣Still a great video and love watching your stuff.

[@wires4auto]

This should be called "how to use a smoke machine correctly" 💪 awesome work guys

[@LSJUAN]

99% of the 02-05 civics that come into the dealer get canisters and vent shut valves due to the valve leaking and the bolts breaking off in the canister. Super common.

[@larryd422]

munoz4415 preach.

[@thegreatwhitenorth8754]

Yep.. 97 to 01 crv same thing.

[@whoawoahh]

what about 2001 honda civic? getting that P1457 code

[@amclamb9543]

Having same code for my son's 2000 Honda Civic. I'm gonna change the vent solenoid today and go from there. Otherwise I'm gonna be using my MacGyver skills. #mechanicsdaughter

[@zimmcal]

Angela McLamb How did it go? I also have this code on a 2000 Civic. Thanks.

[@amclamb9543]

@@zimmcal the engine light came back less than 50 miles later. The only other thing I haven't changed is the charcoal canister which is what I wanted to change to begin with but my husband wanted to replace the cheaper parts first. 🙄 Would've been cheaper if he listened to me. Fortunately as of January the law change where we no longer are required to pass emissions for the years 2000 or older so we aren't changing it unless we have to. Still runs fine anyway. 😂

[@whoawoahh]

@@amclamb9543 how is it running still? I also opted to ignore the P1457 code due to having no emissions restriction laws in my state

[@amclamb9543]

@@whoawoahh it runs great!! Almost 300k miles now. Also replaced the gas cap because the other one was old and wasn’t sealing like it should. But otherwise it’s been great. We have to put Lucas Oil treatment between oil changes but that’s it

[@jimhackney4727]

Good video. I learned this same lesson about 7 years ago, and I've seen it several times. No smoke but evidence of a leak at the flow meter means the spray bottle with soapy water is coming out, and almost without fail it is leaking at the vent solenoid that is mounted directly to the canister. I have now seen this exact scenario on Honda, Mitsubishi, and I believe on Nissan too if memory serves me. On a side note, since I have seen no smoke with a definite leak so many times, I now rely on the flow meter, fuel smell, a spray bottle, and the sound of leaking air as my primary evap leak tools. Smoke is just a bonus that I cannot always count on. I'm from northern Ohio so we have plenty of rust issues here.

[@jabesauto9146]

Thank you Sir. This is how in reality is at the shops, and sometimes an hour of diagnostic is not enough . And I’m speaking for an independent shops. Muchas gracias Scanner Danner.

[@medic1dl]

So....do you have a smoke machine for sale.......cheap?

[@williamstru2119]

eBay has some cheap ones

[@juanrodriguez-ry6yt]

no more scanner danner it's evap danner from now on

[@dmurf4156]

Hey good job man, thanks for showing how it goes in the real world of Evap diaging.. Its just some of the aggravations we love to hate about working on these vehicles for a living.

[@unclegeorge6175]

Never complain how long it took as far as I'm concerned, this was a great learning experience. I am definitely not doing any EVAP leak testing. LOL.

[@phillip1281]

We all know you that is not the last EVAP leak you will ever do😁

[@ScannerDanner]

we shall see..

[@Ronniemartinjr]

Phillip Tyrell I've said it before too.

[@roadkill5333]

What is the possibility that the smoke has to go thru the charcoal canister first, thereby the charcoal is absorbing the oil smoke vapors??? It absorbs fuel vapors, why not oil smoke vapors! I'm at a loss, as to why there is pressure and bubbles, but no smoke! The smoke is going somewhere!!

[@haywardsautomotive6156]

Yes you are correct especially with a small leak. That is where the CO2 leak detector will outshine the smoke machines but the pressure and a soapy spray will still do the trick.

[@roadkill5333]

Hayward's Automotive thank you, kind Sir!

[@ablackformula]

I was wondering why when he took off the gas cap (given he had turned off the smoke prior,) no residual smoke came out. Now it makes even more sense why smoke did come from the vent-- I guess both the vent and the purge line (where the schrader valve is) are on the same post-canister side of the system.

[@haywardsautomotive6156]

It's a non-intrusive split system with the two-way valve. Under vacuum it will leak check the canister side and then the tank side and if it has a leak it'll either generate a P1457 Canister side or P1456 fuel tank side. Under pressure from the smoke machine it will pressurize both sides by overcoming the relief valve in the two-way valve. The purge line actually connects to the two-way valve and only pulls vacuum on the canister side sucking the vapors out with the normally open vent valve. Mike Becker from Wells has a great series on the different manufacturer's EVAP systems.

[@kas0016]

I think the tank holds the most . Too bad 1psi is what it calls for

[@havenocat]

DUDE!! Genius idea!! The spray soapy water found a leak that alluded me for 5 years!!! Same deal as yours at the same part on my Honda Odyssey - spent hours with the smoke which wasn't visible at the leak. BUT those bubbles instantly showed me the source of the leak. Thank you Thank you Thak you!! You can't know how happy this made me.

[@ScannerDanner]

So awesome!! Thanks for sharing!

[@autotechStar]

Hey Paul, i had watched this video before and today a 2012 Lexus ES350 came in the shop with an evap code of P0456 - Evap emission control system leak detected (very small leak). I used this same method with a smoke machine, pinching a hose and the most expensive tool i had which was THE SOAPY WATER!!!!!! lol. Words can't describe what I felt after i found the leak bubbling by the charcoal canister mounting area hed by a 10mm bolt to the frame. I was hesitant on calling the part (canister) but after i saw the leak (bubbles) i was so happy and confident enough to call for it now. Thank you so much for this video and i hope people here learn just like i did!!!

[@moparnutalways]

Pfft! Kilmer would have had it found with a cigar and fixed in 2 minutes 32 seconds!

[@SmittySmithsonite]

Mopar Nut 🤣

[@bobl78]

yeah really... Paul always takes so long to fix things... Scotty finds the problem, fixes it, done :-)

[@JulesBartow]

I'd rather watch ScannerDanner noodling through a problem for hours, sparing me the lesson learned the hard way in person than watch Scotty climb out of the trunk and tell me to ring that annoying F'n bell.

[@anonimoe8886]

Don't forget! To ring that bell!

[@laprietita14]

Mopar Nut lol that guy is not all there

[@madmotorrepair1748]

#bestautoteacher

[@roadkill5333]

Todd Davis you should check out DiagnosDan here on KZbin. I'm impressed so far.

[@ScannerDanner]

agree! I've only seen one video by him so far but I really liked it. It was very clear, clean and concise

[@ScannerDanner]

thank you Mad Motor Repair

[@ScannerDanner]

Thank you Todd Davis!

[@seankoogler5865]

This is the second time I've watched this video and it just reminds me persistence will prevail is one of the best videos out there thanks scanner danner for doing this

[@ScannerDanner]

Thanks Sean!

[@Ruleisbroke]

Thanks, great video, really shows the frustration with this sort of problem. I am in the middle of it now with a P0456 on 2006 Suby Forester. Your video helped a ton.

[@JoesAutoElectric]

Evap smoke machine $1200. Bottle of soapy water=Priceless!I know your pain with EVAP. Every system works different and it seems that any training courses we take make it look so easy to diagnose...until that car rolls in and the suffering starts. They should be standardized in the industry across the board. Great job finding it. I honestly thought it was going to be the canister. I have had a bunch of them fail on those cars. It's nice to see that even the great Scannerdanner can get a bit frustrated at times. Great video brother!

[@scottpostle4379]

Great job finding it! I have given up trying to fix P0497/P1457 on my daughter's Civic. Electrical is all good. I've replaced every part and every line I can reach without ripping the car apart. Where we live It only needs emissions inspection two more years, so it is what it is until she finishes college and gets a car younger than she is.

[@knock904]

Thanks SD..u just made me take real understanding of evap system..I use to avoid those job ..especially being a DIY guy/ mechanic. Thanks again

[@ScannerDanner]

The pain was worth it then! Thank you

[@heathbushell4948]

that was awesome, i don't think i've ever watched a 45 min You Tube repair video. Nice work.

[@ScannerDanner]

Funny, I almost didn't post this video. So glad I did. It was misery filming and editing but worth it in the end. Thank you so much! I'm encouraged by your comment.

[@Drunkis1337]

Evap leaks are one of the things I hate the most. I never thought about using soapy water which i have a bottle of on my cart at all times. Now I have another approach. Thank you again.

[@aviationist]

SD, dude you helped me fix an 03 Lexus RX 300 back in 2012 while I was at Tyndall AFB, FL. I'll never forget that and I'll always be grateful. So, I was watching you climb aboard the struggle bus with this EVAP leak. I am an aircraft electrical and environmental systems troop with the air force, and one of my main duties is troubleshooting and finding oxygen leaks on aircraft O2 systems. These leaks happen all the time and they are just as small as the one you ran into, and they're on crummy components just like that. I have a secret weapon for these leaks. Now, I don't know how expensive this tool is in the civilian world but it is my best friend. It's called an "ultrasonic leak detector" the ones we have are made by Hewlett Packard (hp), and I can start diagnosing the location of the leak from outside the aircraft without having to isolate system components or use "leak tek" (soapy water). I can hear through headphones where the leak is and through adjusting the sensitivity and volume I can pinpoint any leak in the system in 5-10 minutes. I love it, it's my favorite thing to do, and I always blow people's minds with how fast I can find a leak. Super cool tool, you should check it out, and EVAP leaks will probably become your favorite task. It might be too expensive for your shop, I don't really know. Cheers! And happy Thanksgiving.

[@testuser3167]

In the civilian world, those are much more common in AC leak testing, so I never thought of using mine for that, but thanks for the tip!

[@funkcrewbandonly1]

Yeah i hate them EVAP Leaks too. Watching your video i learned that sometimes the obvious thing's you see in a visual inspection could very well be your problem. Not saying not to troubleshoot the system first but, i see that weather beat parts are to be looked at seriously. Thanks ScannerDanner! You always locate and fix the problem/problem's.

[@apmasterl]

Thank you for showing your struggles. I thought that I was an idiot when I struggle on resolving mechanical issues. Soap and water... funny.... when I was thinking I needed to buy expensive tools to solve my evap leaks.

[@nfotabongconrad3564]

Scanner Danner, I really love your channel especially the fact that you never miss a chance to explain every single move you are doing. and even when you are done with the fix, you usually come back and prove that the theory you were talking about actually works. I am referring here here to all your videos I have watched so far, not necessarily to this specific one. thank you so much and keep it up.

[@pangelmontalvo16]

great video,it was natural!your good,I felt like I was part of the group finding the leak.I'm a mechanic enthusiastic for a long long time.keep up the good work,we need good mechanics,not half ass sloppy mechanics.ty🙂

[@ScannerDanner]

Thanks so much!

[@wesleybrabant3595]

Great video...1 think I 've learnt in the past..never give up when trying to figure out your vehicle n gotta love what you're doing. Glad you found the leak...good ole soap and water trick did the trick!

[@fire7765]

I would like to thank you for helping everybody out with your videos, I have your book I like it, May God Bless You.

[@ScannerDanner]

Thank you michael loeffler!

[@junocomjuno]

This video is the most educational to learn about so many aspect troubleshooting evap system. Learn a lot and thank you so much

[@ScannerDanner]

Thank you!

[@KingsWeldingandAutomotive]

I just repaired a 2000 Honda Accord 3.0. leak at the same exact location. Thankfully I had found a video of someone else with the same issue too!

[@usefulgizmos]

ScannerDanner, Thanks for not editing your video to not show your difficulties. Learned so much through your difficulties. I'm thinking now that setting up a 1.5 psi pump and just using soapy water will be the way to find evap leaks. Forget the smoke. Maybe others can point out cons to my plan. Just a DIYer, not a pro.

[@ScannerDanner]

It's what my brother does my friend. Thanks!

[@exemplary_vegetable]

Unreal. Very informative video--my mechanic should watch this. He's pretty good, but I have been having evap leak issues on my '01 Civic, and so far that has not been resolved.

[@Henntag]

Just started watching your videos not long ago but you are a genius. Thank you for sharing your knowledge. God bless.

[@ScannerDanner]

Thank you! Welcome to my channel too

[@richwerkz6931]

One of my idol,,,I've learn alot from your videos sir,,keep it up sir and I will keep on watching,,,god bless u sir❤️

[@elyessy7238]

Great video, awesome topic. I sincerely hate dealing with evap codes and this put an extra diagnostic method in the arsenal. Thanks for not giving up, lol.

[@deebalt071]

And this is why we prep our customers 1-3hrs diag for evap leaks. Especially Toyota evap systems. Good find. I gotta use the soapy water more offend after spending an hr or so chasing small leaks but no smoke

[@samsonbreed6049]

Dude..you made me feel a lot more relieved👍👍. I'm looking for a small evap leak on my car, have it up on 4 jackstands. And for the past 3 days I've been so frustrated and burnt out, because I just can't find it..I thought it was just me..but I'm just a home DY mechanic. Your a professional..and still struggling. I feel the same..I PHUCKEN HATE EVAP SYSTEMS 🤬

[@thegreatwhitenorth8754]

Ever try changing your gas cap?

[@dirkdiggler2870]

Props on the "Master Blaster" spray bottle - AWESOME!

[@ficotobar361]

you are the master ,mechanic challenge and patience

[@johneric3886]

I like your comment on how there's a high probability on the newer designs they took the Schrader valve out.

[@0202hcauq]

I enjoyed watching your video clip every minute. Thank you for sharing. It is a good feeling to resolve issues big or small.

[@theginjaninja9768]

stethoscope with the end removed helps with small leaks too especially on top the tank. Thanks for the videos!

[@donho9670]

Great video(as usual), thank you Paul and Caleb!

[@Mahigeer1]

Thanks for NOT giving up.

[@YohAsakura1702]

I'm so glad that you found the leak!

[@chuckgilbreath3033]

Thanks so much for all u do i've learned and APPLIED so many things learning more every day thanks again.

[@davidhall3747]

Thanks for being patient when diagnosing for a Evap leak. The lesson learned is if the leak is small use leak detection liquid.

[@edwardthayer9386]

You are a great mechanic! Thank you for sharing your knowledge!!!!!!!

[@ericksanchezHN]

Big respect for doing this video the way you did it… 👏

[@effulgent.8]

This was a beautiful piece, patience indeed is a virtue. 👍🏿😊

[@dannymorales339]

Such expensive tools go to show you. Some old school techniques never should be left out. Shout out from dan Southern California.

[@johnmckamy6398]

Thanks for the video and thanks for going the extra mile . really good one as usual .