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1997 Saturn SW2 Question: what is wrong when you get the code p0401 and p0420 and you change and clean egr



, Victorville, CA, December 19, 2011, 15:48

egr and o2 sensor was change but we're still getting a code vehicle runs good what need to be done

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  • Answer #1

    December 19, 2011, 16:24

    The P0401 code is for the insufficient EGR flow. It does not mean that your EGR valve needs to be replaced. It might be just the EGR ports are clogged . Its needs to be cleaned first before replacing EGR valve.
    P0420 code shows that your catalytic converter does not work as it supposed to . You should try a chemical first to clean converter if it wont help then converter needs to be replaced.

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