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Hey everyone, I've got an 03' tundra v8 and the check engine light came on so i pluged one of those computer readers in that tells you whats wrong.
it came up with code 0442 (evap small leak)
what can i do to fix this? i un-hooked my battery for about 5 mins then hooked it back up and the check engine light was still on. any ideas?
Thanks
Paul
 

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Hey everyone, I've got an 03' tundra v8 and the check engine light came on so i pluged one of those computer readers in that tells you whats wrong.
it came up with code 0442 (evap small leak)
what can i do to fix this? i un-hooked my battery for about 5 mins then hooked it back up and the check engine light was still on. any ideas?
Thanks
Paul
Check your gas cap and make sure it is sealing tightly.

Rick
 

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You may be able to just turn the o-ring in the gas cap over and get a little extended life out of it. My 99 cruiser failed the texas inspection because of the gas cap((inspection requirement on older cars in TX). the inspector said to turn it over and try again. It worked.
 

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If the gas cap is tight check all the hoses coming from/to the EVAP system. It's the black box next to the brake fluid reservoir. I had a loose hose and got PO422 and PO441. Reconnected the hose, problem solved.
 

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Paul,

I posted something on this about 3 weeks ago.

The 2003 & 2004 models had a manufacturing defect on the gas filler tube. I posted pics of the defect in my post. The problem is that the sealing surface (between the filler neck and the gas cap o-ring) is not-smooth. It has a couple of valleys in it. As the o-ring looses some elasticity over time, it won't seal up against that non-smooth surface and throw a code.

Toyota put out a TSB on this and many of the '03 & '04 owners had the filler tube replaced within 10K miles or so. This part is covered under the 3/36 portion of the warranty, so Toyota won't cover this (even though they should) if you're beyond that period.

The part costs anywhere from $120 to $140 and is a piece of cake to install.
 

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Discussion Starter #7
well when I got to my truck today, the check engine light was'nt on any more. so what does that mean? the truck fixed its self?
 

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Not necessarily. This code requires two cycles with a leak to come on and will go off by itself if the leak is not detected for several cycles. IF the code came on due to the gas cap not being tightened properly, then the problem very well could be "solved". On my truck, the light would come on, I would reset it right away, and it would stay off for some time. Eventually, the light always stayed on.
 
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