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Question: what is Code P0420

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2002GMC4X4, Grandville, MI, May 14, 2012, 18:33
 Rookie

What is the fix for Code P0420 on a 2002 GMC 4X4 4.8L

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  • Answer #1

    davecallans May 15, 2012, 08:48
     Technician

    It could few different things,a bad converter,one of the 02 sensors,ignition timing,exhhaust leaks,or possibly a faulty engine coolant tempature sensor.

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