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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. 03-09-2010 09:01 AM #1
    phernic
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    P0420 code

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    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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  2. 03-10-2010 05:41 PM #2
    phernic
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    will an STI up pipe and down pipe bolt onto 04 wrx?
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  3. 03-10-2010 09:05 PM #3
    T0rque
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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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