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2000 Saturn LS2 Question: code reads p0421



Visitor, 3.0L V6, Portland, TN, September 22, 2010, 17:37

code p0421 on computer. car runs perfect. what possible causes?

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  • Answer #1

    September 23, 2010, 22:09

    Common causes are: Defective Warm Up Catalytic Converter, Engine misfires have damaged the Catalytic Converter.

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