P0420 code
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This is a discussion on P0420 code within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Has anyone dealt with P0420 code? if so, what was the cause of the problem so i can narrow it ...

  1. #1
    Registered User phernic's Avatar
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    P0420 code

    Has anyone dealt with P0420 code? if so, what was the cause of the problem so i can narrow it down? any suggestions on how to test 02 sensors? thanks!

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  3. #2
    Registered User phernic's Avatar
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    will an STI up pipe and down pipe bolt onto 04 wrx?

  4. #3
    Moderator T0rque's Avatar
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    Yes but the STi uppipe is the only thing that is different than your stock parts.

    What are your modifications?


    Lead Wrench @ WTF Tuning, LLC

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