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  #1  
Old 07-12-2010, 07:02 PM
redeye4u redeye4u is offline
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Hi all. My check engine light came on. I had it scanned and the codes came back as po440 po442 po456. They say it is a small evap leak. Where do i begin to look any help will be gratefull. Thanks DArcy.
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Old 07-12-2010, 07:46 PM
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I know many others with more experience than myself (I am no mechanic) will be able to weigh in on this, but, couple things that come to mind, loose or missing gas cap? Have you fueled up with the engine running? Those are just the first two I can think of right off hand.

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Old 07-12-2010, 08:38 PM
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Check your evap lines for breaks and cracks. You could also have a bad fuel cap.
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Old 07-12-2010, 10:05 PM
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Thanks guys. I will check those items. Gas cap aftermarket or dealer. Which way to go on that one. I just bought the truck and only have put a 1000 miles on it. It has only 67000 miles.
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Old 07-12-2010, 10:07 PM
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If you recently filled up, it may have just been loose.

A fuel cap available from a local reputable auto parts store for your vehicle will be fine.
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Old 07-12-2010, 10:11 PM
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Quote:
Originally Posted by MADDOG View Post
If you recently filled up, it may have just been loose.

A fuel cap available from a local reputable auto parts store for your vehicle will be fine.
Unless you decide to go with a locking cap; then you'll want a cap from the dealer.
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Old 07-12-2010, 10:12 PM
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^^^^ True That! ^^^^
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Old 07-13-2010, 09:15 PM
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thanks guys. will try the gas cap. than reset the computer and go from there.
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Old 10-15-2013, 02:44 PM
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I had the same problem with my '03, after I replaced the gas cap, I found a dry rotted hose to the fresh air filter under the truck by the gas tank, replaced that, (dealer Item only,PN 52121100AA $8.70) and no more code, but now I have a P0499, I had a couple wires that go to the NVLDP rubbing on the front driveshaft and shorting out the EVAP system, I'm hoping that if I drive the truck it will clear the code as it is a monitored system by the ECM and needs to get a couple good trips in to clear the code itself.
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