2008 envoy codes p0430 p0420

Asked by Jennifer Mar 18, 2020 at 07:00 PM about the 2008 GMC Envoy Denali 4WD

Question type: Maintenance & Repair

Got these codes what's the best
solution is there a quick fix

1 Answer
11,605

FJ4072 answered 4 years ago

There is no quick fix for this. I'd bring it to a muffler shop and get their opinion, maybe have a back pressure test done.

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