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  1. P0420 Code! Cat Converter? Or o2Sensor? Help!!!!

    2.0 Liter Gas
    So I just recently had the front o2 sensor replaced and I will get more into that as I feel it may have an affect on this. So the Bung for the front o2 sensor blew off the manifold, like completely. The o2 sensor was just left hanging. Well I just recently took the car to the shop and paid...