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1998 Toyota Corolla Question: I have a p0420 code where should I start

 

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Masteret2012, Philadelphia, PA, September 08, 2012, 17:37
 Rookie

Before that I have a code that the auto zone guy said it was a oxygen secer I never replaced and just reset now it says p0420 bad cat. I runs great should start by cleaning maf or what lol

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  • Answer #1

    September 09, 2012, 04:07
     Master

    Start by having a SHOP verify sensor and converter function with live data scan.

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