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P0420 Code Help Please
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Thread: P0420 Code Help Please

  1. #1
    Suby Talker
    Join Date
    Aug 2009
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    Morton, Pa
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    Default P0420 Code Help Please

    My 2001 Forester threw a P0420 code at 142K miles, I am going to change both O2 sensors and replace the exhaust gaskets but if I have to replace the Cat can I use the 49 state converter or do I have to use the 50 state converter ? The sticker states Californis emissions on the engine sticker/plate. The Catco brand looks good and they sell both types. I live in Pa and would like to save $ but want the car to run well. Any thoughts? Thanks

  2. #2
    Noobinator
    Join Date
    Nov 2010
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    Default

    I replaced both o2 sensors but still get the P0420 code after driving a bit. Should I have changed the exhaust gaskets also??? Or is there another possible cause?

  3. #3
    Noobinator
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    Nov 2010
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    Who is this guy??? This is the third bogus post.

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