P code

Discussion in 'General Motoring' started by Carebear, Sep 30, 2022.

  1. Carebear


    Aug 23, 2022
    Likes Received:
    I have a 2010 Forester. I continue to have my check engine light come on. Sometimes goes off by itself or I have my mechanic reset it. Code is P0420. I have replaced the spark plugs/wiring harness, both O2 sensors, Cat converters and most of the muffler system. Any suggestions as to what else might be the problem? Thanks.
    Carebear, Sep 30, 2022
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