CODE 0420 ON A 2002 MONTE CARLO SS 3.8L ALSO RESONATOR PIPE IS LEAKING WILL THAT CAUSE THE CODE
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Asked by TIMOTHY Feb 07, 2013 at 12:14 PM about the 2002 Chevrolet Monte Carlo SS FWD

Question type: Maintenance & Repair

WILL A LEAKING RESONATOR PIPE CAUSE THE P0420 ENGINE CODE

3 Answers
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elvisman4 answered 12 years ago

same hear, get leak fixed, causing oxygen sensor to read wrong and causing computer to set the code.

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GTProger answered 11 years ago

Hey @TIMFLYF! I was wondering if fixing the resonator cleared the P0420. Many people say that a leak downstream of the Cat will not cause a code. I have feeling it might. I'm facing the same situation you were facing, so I'd appreciate your feedback!

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