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Discussion Starter · #1 ·
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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Discussion Starter · #2 ·
Oh yeah, it has 63,000 miles and runs fine when the lit is on.
 

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Discussion Starter · #3 ·
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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