p0420 question
11-29-2009, 11:28 AM
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p0420 question
Is that always a cat failing? Need to know before I spend the money on a new exhaust system next week?
Thanks
Don
Thanks
Don
11-29-2009, 11:33 AM
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It can mean a cat failing, engine coolant sensor, exhaust manifold leak or an O2 sensor. See https://www.gmforum.com/t284086/#post1390979
11-29-2009, 11:50 AM
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Thanks, I will have the 02 sensor scanned before I replace the exhaust. I don't think it is an exhaust manifold leaking.
Don
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