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Old 10-16-2012, 08:01 PM   #1
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Check engine light (code P0431)

My check engine light came back on again today, it only comes on after idling for 5 minutes or so. I did the key on, off, on, off, on, and it shows P0431. What's this code? BTW, I have already changed all 4 O2 sensors ( apparently I have Cali emission). I can clear the code by unhooking the battery, but the CEL will come back on eventually. Thanks in advance.

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Old 10-16-2012, 08:03 PM   #2
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Oh yeah, it has 63,000 miles and runs fine when the lit is on.

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Old 10-16-2012, 08:27 PM   #3
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Nevermind, I googled it. Looks like it could be cats, exhaust leak, or oil leaking into exhaust. Really narrows it down!! Guess I'll start by tightening my exhaust.
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