P0420 code

Asked by Mar 13, 2012 at 11:21 AM about the 2006 Pontiac Grand Prix

Question type: General

Code goes on for a week and off for a week, I took it to    
the shop and they said I had a bad gasket that
connects the converter to the muffler,they fixed it but
light is back on...help!!!

1 Answer

you could have a bad 02 sensor at the CAT or your CAT is bad. Cats don't usually connect to the mufflers, but if the gasket was leaking at the CAT it could have damaged the CAT.

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