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  1. Focus RS TroubleShooting
    Definitely have heard people throwing this code before. 49,000 miles stock 2017 Focus RS, no tune (to my knowledge) unless the previous owner had one but I highly doubt it. Bought the car in December of 2020 and I'm pretty sure the dealership was running 85/86 octane in it. After first fill...
    exhaust fors o2sensor oxygen p0420
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