CEL code issues

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BenAthar
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Joined: Sun Jan 16, 2011 7:44 am
Location: Tucson, AZ

CEL code issues

Post by BenAthar » Wed Aug 03, 2011 6:16 pm

It's getting time for me to do the emissions test and now my car is throwing codes of 420, 442, 455, 456. All of this from replacing my gas cap! :cussing:
WTF! This is why I hate some of the newer cars and their emissions valves and crap! Why would all of a sudden the Cat go out and a small med and large leak show up, when it was just a large and small leak? This is crazy. Might have to clear the codes and then drive it before the code pops up again so I can register the car. That or move to a county that don't do emissions testing! LOL!
Anyone else has this issue and what you did to repair it?
Official "I'm Going to Drive My Neon till it Dies" Club #000111
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occasional demons
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Location: Ashland Ohio

Post by occasional demons » Wed Aug 03, 2011 8:52 pm

I seriously doubt the p0420 was caused by a faulty cap. You prolly actually have a bad converter. The chances of the o2 sensors having closely matching outputs, with a good cat are prolly pretty slim.

What cap did you install? If it is a non Mopar/Ford/GM locking cap, it will leak. If it is a vented cap, it will leak a lot. :lol:
Bill
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2000 Neon MTX swap with '02 R/T PCM
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2003NeonSXT
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Post by 2003NeonSXT » Wed Aug 03, 2011 8:54 pm

P0456 has been a problem for me...Changed Gas Cap and Evap Canister with no luck
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