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    P0420 Check Engine Light

    Good Morning, I have a 2003 Ford Explorer w/4.6 V8, recently had check engine light come on P0420 bank 1 etc. Changed out all four o2 sensors picked up 2 miles to a gallon, cleared light. Yes, it came back on again, used Cataclean, cleared code and yes, back on again. Was going to change out...
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