Check Engine Code Says EVAP? How to Diagnose EVAP System Problems and Leaks

[@randyd9805]

This is by far the most complete video on the small evap leak that I've seen so far. I was thinking I might fix this myself cheaply but not so sure I can fix it OR that it will be cheap. At least I know a few more things I can look at, but I may have to take this in since I really don't have the time, tools, or inclination to fix this myself. I did buy a new gas cap and that did shut this off for a little while then it came right back on. I did not notice if there was any rust build-up there so I will check that now.

[@chepito2k10]

Most videos just show how to replace each part but don't show how it's all connected. I've replaced my gas cap twice and was about to replace my purge valve. Now I can look at everything and make sure there's no visible problems. Much appreciated 🙏

[@alexandercahoulan6583]

Usually I severely dislike 1A auto but this guy and Sue are the best and they legitimize the channel. In my humble opinion lol

[@pelqui69]

With such a good video like this, I saved me thousands of dollars going to the dealer / shop. Greatly appreciated.

[@michaelpalmer0150]

Your videos have helped me to move forward in my automotive career and I greatly appreciate the content.

[@rd3914]

Don’t do it

[@walter.bellini]

Thank you for the video, beautifully done, and good info pushed out Suggestion is to make sure that you check the rubber hoses around the Purge Valve, especially if your car is older as the rubber gets hard and begins to crack. If you have a vacuum gauge, test out the purge valve on the exit side NOT the intake side where the fumes come in, test to see if the output portion of the valve hold vacuum if it doesn't then that is part of the problem, buy a new OEM valve, avoid aftermarket ones for the long haul. I am going through this on a 2008 Lexus ES350, working the issue through, but can't easily get to the canister in the back as it is buried and not easily to access without a real lift which I don't have. Thank you

[@mironkorzalko7761]

My dealer wants to replace the entire assembly when just the cracked hose you showed is chewed up....what's a good replacement for that rigid contoured hose?? I'm not paying 1000 dollars for 10inches of bad hose.

[@raelmacintyre974]

Would an EVAP leak cause hard starting?

[@JuanGomez-gb6ce]

Hi very informative video. I have a 2016 Corolla with strong fuel smell coming from AC vents first 1-2 min after being started in morning, then clear normal air and no engine codes. Any idea of what could be my issue?

[@ro-landocalrissian4633]

I’m curious is the code for an evap canister the same as the code for anything else including a gas cap problem?

[@paulraven2046]

How do I know if it's the purge solenoid under the hood or the vent/whole canister assembly? I'm just guessing and don't have a high level scan tool.

[@bryanavila13]

Also don’t buy aftermarket fuel caps. Use oem parts. Thank me later 😎

[@mlaugh3]

it happened to me...............use OEM.

[@iranmatias-quinones6247]

I greetings. I have 2010 dodge charger code 0455 . Did smoke test, saw leak at the canister. Better known as the " fuel vapor leak detection pump filter". Strange but true.

[@toml3651]

Help me understand this: If the engine is off, the vent is open? Does that mean the gas tank is venting into atmosphere? Is there a one way valve in the vent line to keep this from happening? I don't smell gas fumes wnen wandering about the car so I assume the gas fumes in the tank are not escaping even on a hot day. Am I correct in assuming the round canister next to the vent valve is some kind of filter? How much pressure can build up in the gas tank? I know, too many questions.

[@MrHeHim]

If its a rather dry engine bay, no oil leaks. I just look for 'wet' vacuum lines. When the car is off the oil in the lines will soak the area the leak is in 😉 And if everyhting is clean, then i start checking like in the video above 😁

[@grominwithrob1339]

I had a bad purge valve that simulated a vacuum leak with no codes. Caused 1-2 random misfires on random cylinders. Caused the truck and transmission to operate like pure crap. Fuel trims where horrible. I figured it was an internal leak because propane on a cold started engine didn’t have any effect. Brake booster was fine so it really narrowed down to the purge valve quickly so I checked it out. It was stuck open. Replaced it and did a fuel trim relearn and it my truck is running and shifting great again.

[@Journeyman-Fixit]

On my 2003 4.3L GMC Sierra I replaced both purge valves (front and rear) and after putting a smoke machine on the system there where no leaks BUT I still get the P0442 / P0449 codes??? I am going to try replacing the charcoal canister next.

[@clearblueswamp4328]

For anyone having recurring issues with the Evap code coming on and not passing inspection, Change out the pressure switch on the tank, it's in the same harness as the Evap, and will cause the light to come on, although the switch is basically for hard start, If there is a glitch in the switch, It triggers a Evap code, I have found this in numerous other cars, And for under 40 for the switch, its not worth the headaches, Believe me you will be happy you did, Enjoy your new sticker,

[@biggabe4904]

I have a p0446 on 2001 chevy tahoe. I changed purge valve, ventilator valve, and gas cap. Check engine light came back on. Only thing I haven't done is the charcoal canister.

[@shirlynb148]

Getting Evap code and also check fuel fill. I put $6000 last year ( 3 catalytic converters, purge something’s, sensors etc). My problem is I don’t have a fuel cap it is capless. I have cleaned the nozzle which works for a while then boom warning light comes on again.

[@pirihern9329]

Not that simple. Many different evap systems. I had a po444,po456,po448 and po447. Fixed the 1st 2. The 2nd 2 cost me plenty

[@ronmelbanegas8179]

I change the vent solenoid and the canister vent and the check engine still on?

[@jeanniewebster193]

Good video. You are a good teacher!

[@18Blueflyer]

I heard over filling the gas tank on my forerunner can Cars and evap system problem is that correct?

[@BigEightiesNewWave]

Problem is it is NOT showing the 3rd vacuum line going to the Purge on Fords, all the way to 2008. Not the bigger diameter plastic line carrying the fumes into the manifold, the small diameter plastic line the supplies vacuum from throttle body to the purge valve. Not one so-called expert has answered this, though on one site the author said it was needed for a Ford Purge to operate. I had a big vacuum leak/P0171 mechanic knocked the line off at the TB, I found it/fixed it. I had ZERO EVAP-related codes during the 2 weeks the vacuum line was disconnected, so what exactly is this vacuum line for? During the time it was off, I had all the usual things a vacuum leak would exhibit. Fuel trims way too high, high idle, then low rough idle, stalling, and low downstream O2 sensor readings. Also the P0171 would come back after I cleared it. I suspect it is used to generate vacuum for the EVAP bleed-up rate test. That test is not run very often by ECU, but someone with a scanner can do it, and watch the bleed-up rate.

[@1AAuto]

+Buff Barnaby Thanks for the feedback!

[@Una2Cold]

My mechanic is saying to change the esim and that it’s a common thing with dodges. But no one mentions the esim in any videos pertaining to small evap leaks

[@josebugarin9111]

My hose going to canister vent was cracked and loose I just exchanged it with new one hopefully 🙏 that solved my evap leak. and that check engine light stays off.

[@northwestmechanic8991]

I have a 2003 Honda Odyssey EXL with a P1457 EVAP code. It says (canister area). I have replaced the charcoal canister and charcoal canister vent solenoid and bought a new oem gas cap. If you could help me eith this, that would be awesome.

[@joecrump5354]

This guy speaks clearly, he is thorough and logical. But the music soundtrack is unnecessary and super annoying.

[@nickjames205]

I'm getting a p0440 for EVAP system but I'm also feeling the engine jolting a bit off and on. I don't think you should feel anything from an EVAP problem. Where should I start?

[@scubadivingrickydamiano]

Had that on my HHR the cap was bad. Replaced and it's fine

[@alandust2188]

Can an EVAP code be caused by a cat code such as a 0420?

[@cjackfly]

It's the other way around.

[@drock890]

Can a Evap leak cause P0172 and P0175. It’s fuel trim to rich in bank one and two!

[@medibaba9696]

Hi I tested the sensor, it works very well but does not work on the car, I tested the wires the first has 12 volts and the second o volt, how do I know where the wire is cut

[@tyronewalker5764]

P0455 in my 2K Dodge Dakota, 2nd gas cap and replaced evap solenoid. At my wits end!

[@vitaminb4869]

Maybe replace the gas cap a 3rd time, that will help 🤔

[@samustephens1400]

Can you do a tutorial on 2011 Nissan rogue AWD krom EVAP Large leak

[@1AAuto]

We do not have a video for this repair right now, but we'll keep this request in mind for a future video! 1aau.to/m/Shop-1AAuto-c

[@keepingupwithchanellll]

Did you fix it

[@RobertJimEvans]

What causes the purge solenoid to consistently fail every 2 to 3 months?

[@vetongashi5945]

Do you have any idea for 2008 Mercedes e350 I have 2 codes P0455 P0497

[@AgustinaQuinteroFelix]

I have a buzzing noise but is coming from the upper Window rear side driver seat. it does it without me turning the engine on or putting in no key. even when i close the door and is not running then like about 2 minutes or less it turns off. i also press my door lock with my hand and the buzzing came back.

[@mrashad219]

I have smoke coming out of the canister vent valve exhaust is that it's not even hose looks like electrical flex conduit connected to it.

[@usa2342]

I got EVAP leak and incorrect purge flow Do I need a new tank? Is it possible to change at home?

[@terrywillis9383]

What may cause blow back in the gas system when one goes to fill up at the pump? This is the trouble I am having on my 2006 F250 SuperDuty.

[@JohnDoe-kl2ck]

The problem is you bought a Ford

[@Scruffy42467]

Fuel pump

[@aks_sisters]

@@Scruffy42467 had to replace fuel pump after ignoring large evap leak code for over a year. Apparent the evap line is made of soy and rats chewed it up. Got stranded in the middle of nowhere but got lucky was able to get cell service m. $1500 repair plus $200 hotel stay ouch. Don’t ignore and fix asap.

[@dexterfan78]

put marvel mystery oil in my tank evap code went away after a month.cleaned gas cap and filler neck also.

[@rodneyclark1990]

I having fuel coming from my evap vent solenoid and can't figure out why I patched some rusty lines and now it leaks fuel...please help

[@antonioescobar8414]

Thank you bud

[@tcply9450]

2009 kia sportage , code p0455 , and i can hear bubbling in the tank when i take the cap off and every time that i fill up with fuel i have to crank several times to start the engine but only after adding fuel ,, got any ideas ?

[@marcusfrazier867]

I keep getting a 443 2000 Durango 5.9L say the circuit is where I should look tested to pcm and keep getting the same code. Replaced the purge valve 4 times still same problem smell gas on cold start

[@1AAuto]

+Marcus Frazier We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@danieltenorio3559]

Help:I just changed my fuel pump , I got a tighten fuel cap after then a check emission system after . Any idea why?

[@smurflette06]

Replaced all of those and still getting a check engine light but now with no gas cap issue 😫 any ideas? No obvious line brakes no filler neck deformity.

[@Metube8166]

I just had my alternator replaced and a thermostat sensor but now I have a p0443 code. My friend who replaced the alternator and sensor said the check engine light will turn off in a few days after driving is this true?

[@mrvic92154]

It's been 3 months did the light come back on if it did did you fix it and if you fixed it what was it just curious it might help on other people's situations thanks

[@jonathandahl7844]

I have suburban 2007 flex with p0171/p0174. It came after p0175 and the injectors changed. The alcohol was 50% and the fuel trim was reset, and it dropped to 3-4% but now it missfire, cant drive, barely idle .Then the other two code came. The new maf, fuel pump, throttle, new ignition cables. Smoke test for leak showed nothing. What can it be?? Evap? Map? Fuel pressure?

[@MrGoalminded]

I have a 2011 b200 mercedes and i got the p0441 purge control valve jamming /stiff open not sure where it is can ya help a brother out

[@Oscarisahoe]

Can anyone tell me why my vehicle takes at least 2 tries before it starts up? Sometimes it takes me 10 minutes to get it to turn on. Ive changed sensors and starter is good.

[@13KimberlyJo]

2000 pontiac firebird 3.8l base I tried to get fuel but it would not put any in I tried n 2 different pumps. Twice on the first one and twice on the next one.

[@oldschool-mario1796]

my honda civic 2016 lx is having that problem now let see where is the issue

[@jerrymontalbano3222]

I'm getting a blinking Monitor icon, "EV", yellow LED indicator light, No DTC's presently stored in code reader's memory. Also, NO Engine light is presently showing on dashboard. I'm not a 100-mile guy at age 75, so it takes me a while to travel around town (don't travel) until a cycle is reached. It's been since May when a part was changed, and codes cleared.

[@Lovee_kevonna25]

What about for capless gas tanks?

[@BryanG830]

I replace the gas cap. Too many times. Didn't work but I don't have to buy any of this stuff. It's clearly visible on where the leak is between the fuel filler neck, what the gas caps at and the axle hose that goes from the fuel tank to the fuel filler door. It's obvious. There is a leak at the field filler neck right behind the fuel filter door. Clearly visible because it's loose and wobbly. I don't think it has to do with it being cracked or anything. I did replace the fuel pump and I had to remove the fuel filler hose in order to drop the gas tank and get to the fuel pump so I think I'm either yanked on it too hard and loosened it up to where it wobbles.

[@carlos1994.]

Why the 2003 ford ranger 3.0 v6 hast two purge valves?

[@jonnypowers22]

What would P00456 be for ?

[@TheScorpion615]

Code on my 2017 Chrysler Pacifica is P0456 with this problem this make and model doesn't come with a gas cap not sure if this could be the problem or not?

[@1AAuto]

+@TheScorpion615 We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@Gabriel2030]

I would like you to make a video with a Nissan versa sv 2017 to do the same thing for me to learn

[@Gabriel2030]

Twice your videos helped me and I thank you for your help.

[@LionsTigersBears]

Think of getting the vapors

[@pedroaguilera5606]

Thank you

[@Asian_Connection]

😢 I don't know where else to go. NO mechanic could figure out my problem. I know this the only place that has the answer. I have 98 4runner with 140k, which I gave my son to use. Recently, the car shutter around 50 mph, it feels like it's searching for gear (going up and down shifting) but I know it's not a transmission issue. Only a few think that I can detect, the tranfercase has a front drive shaft seal leak, probably half of the fuild is gone. And the other was a recent front brake pad change. Clicking sound is heard on driverside drive axle spinning it, car shakes around 60-70 after brake change. PLEASE can someone give me some pointer on where to look. Thx u.

[@rcarmichael7582]

I have a strong gas oddor under the hood of my 03 jeep Grand Cherokee. I discovered, by mistake, that when I disconnected the purge valve hose ( to charcoal canister) the gas smell goes away? When I hook it back up like normal, gas smell returns instantly? Anyone have any idea what’s happening here

[@dwightbutler4802]

Where those all small leaks or was the fuel cap the only one? Mine says EVAP system leak detected (very small leak). Could it be under the car or is that a large leak? Thanks

[@1AAuto]

+dwight Butler We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@billlolokula7375]

Thank you. Grae video..👏👏

[@1AAuto]

+Bill Lolokula Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1aau.to/m/Shop-1AAuto-c

[@TheWordInMyMind]

Thank You 😊

[@peteman400]

My truck is a 2018 with no gas cap so how do i check??

[@BG-wl7yn]

There is no Gas Cap in my Chrysler Pacifica and I have P04ED and P04EF errors :-/

[@byronjoedavidda-veed8732]

I have a question I have a similar problem, but the code is P0440. What does that mean?

[@1AAuto]

+@byronjoedavidda-veed8732 We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@VickieMaluk]

Would it cause my truck to stall out

[@benjaminstewart4332]

Try doing a purge valve on 2019 escape 1.5 eco boost

[@reyvega4293]

Could the P0455 code be expensive??

[@1AAuto]

+@reyvega4293 We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@xatasteofchaosx1457]

I have a small/large evap leak after getting my fuel pump replaced😔

[@ghorbanalirazmjou8591]

Thanks ❤

[@jamieeisenhower1560]

What about a gas smell under the hood Of a 2023 jeep wrangler 2.0

[@1AAuto]

+@jamieeisenhower1560 We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@-g.k.4389]

I did a smoke test and smoke is coming from above the fuel tank

[@jpadilla0515]

What about a 2005 mazda 3 small evap leak

[@scar2001]

I changed all these items and i still have the same code

[@robertrose3068]

I've always read that if you fill your gas tank all the way to the opening on the neck, this could cause issues with the evap system as well. True or false?

[@conductorjohnmthtrains2239]

I get ch engine w/ evap icon no code? Whats up with that

[@johnroberts3868]

Does that apply to an 08 Ram 2500 5.7 hemi? I'll be driving & the engine will sputter then even back out, then check engine light comes on & voltage light starts flashing. I pull over cut it off for a bit & start it back up, voltage light goes off, but check engine light stays on. Code says evap system, already got new gas caps.

[@cjackfly]

Computers are stupid aren't they?

[@markstark7731]

My caddy did that first time it was from secondary air pump which is evap the second time it was making my temp sensor rise and it would stall and almost give out and caused a mass airflow sensor code find out a shop put a bullshit cat on after original was stolen replaced at about 575$ and no problem stalling at all or with the engine temp

[@alexandercuello3168]

Thanks for sharing this video, question every time I start the engine I can smell a very strong gas odor that last about 1 minute. I don’t have any codes or drivability issues but the gas odor is there every time I start my 07 honda pilot. Do you have any ideas what could cause this? Thank you!

[@Roman-rb3cz]

Hi I have a 2000 Chevy Impala. I am getting this code: P1441. "EVAP. System Flow During Non-Purge." I already replaced the Purge Solenoid and the Canister Solenoid and the check engine light with the same code again. Is it possible the the gas cap can produce the P1441 code?. Thank you so much. Hope you will respond to me.

[@mikecronin8825]

Lose the music. It makes it hard to understand you.

[@LionsTigersBears]

Check your hoses for cracks

[@elnosworld9893]

So I have a 2000 Toyota Corolla 2015 and it’s throwing a code for P4020 I’d had that code come up before but it was specific and it was the sensor that is underneath the hood so I guess that’s the downstream I’ve recently replaced my purge sensor, and the brand new one is doing the same thing as the old I almost think that I had an evap Code at some point And a few years ago, I replaced the charcoal canister and both sensors I had some issues were we found hoses that needed replacing for the vacuum one of them wasn’t done, but the other two were the one going into the PCV valve, which was replaced, valve which was also replaced What brought us to realize that there were some issues and it wasn’t only the check engine light, but it was the car that was bucking I can basically not give it any gas or any pressure on the gas pedal without it. Ugh and fucking. Recently watched a video where the guy said if you get a P for 020. Don’t think you can replace the sensors and that that will fix the problem. You most likely need a new catalytic converter. I’m not in position to replace any of it is a big issue because I use my car to make money so having difficulty using it is making things almost impossible Wondered if you had any advice Also, in the last 6 to 8 months, I’ve had to replace all the spark plugs, and all of the coils Alternator went and battery All of that’s been done and still having drivability issues

[@SLiveForTheMoment]

Have issues with p0448

[@aldrincuyugan4482]

i got chevy trailblazer 2004 4.2L ext LS Rear Wheel drive code P0420?

[@1AAuto]

+@aldrincuyugan4482 We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@twinturbo8304]

I still don't understand how the system works. I do appreciate your info on leaks, but I am still in the dark.

[@United_link76]

Some times evap canister valve needs to replacement 😁

[@nokkturtle]

Sooo my car doesn't have a gas cap, is that not normal?

[@Lilchick14]

He SAID LARGE OR SMALL Leaks ITS NOT FOR ALL LEAKS DONT GET ON HIM. YES IT CAN BE OTHET LEAKS. NOR THAT Simple...

[@nicki4435]

What if you don't have a gas cap

[@gamingcrypto-YT]

So can the vent valve cause you to smell gas in the car if it's gone bad?

[@Short_AR1]

Nice

[@elvinlike5738]

I'm getting code poA31 06 H3 no chk engine light on

[@1AAuto]

+Elvin Like We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@SiNFPVGUAM]

Keep the bg music. But lower the levels.