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  1. 08 H6 Outback, misfiring and multiple codes including P0420, P0026

    Problems & Maintenance
    I have had the P0420 code intermittently popping up over the past year or two. Earlier this year I noticed my gas mileage starting to get worse, and I am not sitting at 12/20 while it used to be at 18/27. I have replaced both upstream O2 sensors, and a read one that was showing weird voltages...