Steps to Troubleshoot and Fix a Toyota P0442 Error Code
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- Опубликовано: 30 сен 2024
- How to Fix a Toyota P0442 “Evaporative Emission Control System Leak Detected (Small Leak)” OBDII Error Code.
How to Test Puge Valve Video: • How To Test Evap Purge... Smoke Machine on Amazon: amzn.to/408vnMb
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Was told by repair shop, after smoke test, charcoal canaster was leaking. Had it replaced and codes P0 440 and P0 442 erased. In 50 miles check engine light came back on with same codes. Purge Valve, EGR Vacuum Modulator Valve, and gas cap replaced already for no help. Codes remain. Now what?
No help there. Why can this problem not be solved?
@@LloydMaxson What year 4runner or Tacoma do you have? It could be the Rollover Check Valve on top of the gas tank. Those are known to crack as well as the gasket it sits on.
Getting smoke in the area if the filler neck and cap didn't necessarily mean the problem was the cap. You have to clamp the canister's fresh air vent hose (aka "air drain") whenever you do a smoke test on these vehicles. It actually states this on the service tag attached to the test port. This thread explains it well, especially post #8 ( www.tacomaworld.com/threads/p0442-fault-code-evap-smoke-test-and-other-questions.674372/ )
I don't doubt the filler cap was still the problem, because it normally is with P0442. I also don't doubt the owner thought he bought an OEM replacement, but probably bought a counterfeit off of eBay. The exact same thing happened to me, and when I replaced the new eBay "OEM" cap with one straight from the dealer, it solved the problem. Still a great video though! I just wanted to let people know about the need to clamp that fresh air hose when doing the smoke test.
If you use a scan tool to close the vent valve you dont need to do that correct?
@@Jake-pq3iz I don't have a good enough understanding of the EVAP system to know for sure, sorry. Maybe if you close the valve with the scan tool, and DON'T clamp the hose, if you get smoke near the filler cap it would be a sign the valve is leaking or sticking. Supposedly that's a problem with these vehicles.
I watched your 13 minute video. If you look at the notes I have sent, all the parts have been replaced except the fuel sensor. As I already mentioned, the auto repair shop performed a smoke test and said the charcoal canister had a vapor leak. It was replaced and the code P0-440 and P0-442 STILL came back on after 50 miles and the Check Engine Light, soon afterwards. I suppose I will eventually just have to take it to ANOTHER repair shop and continue to spend the bucks. I hate repairs shops because of how they finagle and take advantage of people. Except for the canister replacement, our 2001 Toyota Camry has only been in the shop once, over 23 years of service. And that was for a timing belt change. It's been a great car.
The gas cap I purchased on-line was from Desert Toyota of Tucson (AZ) Parts Department. P/N 77310-48020. Says on the paperwork it is a Toyota Genuine Part from Toyota Motors Corp - Made in Japan. Don't we have to believe and accept it is a OEM part?
If it's from the dealership it should be OEM. I made a full video on all the EVAP components and how to check them; here is a link. ruclips.net/video/C5s3Rx3wjD0/видео.html
I have been dealing with a 2001 Toyota Camry (4-cyln) check engine light for over 4 years. Always caused by either a P0-440 and/or P0-442 code each time. After erasing the codes the first time, it took 23 months (6,300 miles) to come on a second time. Then 7 1/2 months or 1,250 miles for the third time. Then 442 miles the next time around. The past 8 months or so, it is coming on every 50 t0 80 miles. Why is this not a clue for some one in the world to put their finger on the problem? I have changed the Purge Valve (VSV), EGR Vacuum Modulator Valve, and gas cap for no help and lately had a smoke test and the Charcoal Canaster replaced, after being told it had an EVAP leak. But this, for no help, as mentioned below. Light came on again! What I did do, afterwards, is put the original Purge Valve (VSV) back in and noticed the following. The newer (under the hood) Purge Valve had always been displaying both codes, P0-440 and P0-442 (when the light came on), even after the Charcoal Canaster replacement. But after re-installing the orginal Purge Valve, after a few miles, I noticed only a P0-440 this time. Have 70 miles on car since reseting the codes and putting the light out. No light so far (just a P0-440 code), but expect it to come on soon. As I said, why in all the world doesn't somebody have the Toyota knowledge to nail this once and for all. You can't imagine how much the repair shop charged me for the smoke test and canaster change. Which is why I don't like going to repair shops. All for no help! A person can't keep doing this unless there is a real fix involved. If anyone has other ideas, and more information is required, I will be pleased to provide it.
You said you replaced the fuel cap, but let me ask, where did you get the cap from? I was in a similar situation as you, with a P0442, and the first thing I did was buy a new "OEM" fuel cap. I put it on and cleared the codes, but they came back. I was getting ready to go down the smoke testing route, when the guy I was going to borrow the smoke tester from clued me in about how bad the counterfeit Toyota parts market had gotten and asked if I'd bought my OEM cap on eBay, which I did. It ended up being counterfeit, even though it came in supposed Toyota packaging and stickers. If you didn't get your new cap straight from a dealership, I'd try that first. It might fix your problem! Good luck!
What is the link for the smoke machine. I replaced the GAS cap but I still getting the code.
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I just subscribed to your channel, very informative, I'm a Diy'er. Thank you sir.👍🏻🇺🇲✝️
Soooo.....do I really need an OEM Gas Cap? 🤔
Yes . Aftermarket gas caps cause too many problems.
There are certain parts which you should always use the OE or at least OEM part. One of those is the gas cap. Others are: Oxygen sesnors, COPs (coil on plugs) and cooling system thermostats, among others.
That sure looks like the OEM Gas Cap I just bought for my 04 Taco. Did you ever confirm that the gas cap itself was the problem here?
I replaced it and code hasn't come back yet.
I replaced mine, and the check engine light came back after 140 miles..
@@kingkaing5818 same here