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catalytic conveter

  1. M

    p431 code and running like crap

    After years of ignoring the light, I think it may have gotten me. The only code I have is the p431 code (Cat efficiency below threshold, bank 2). Now my question is is do I need to change the cats, or could I just do the O2 sensors. I have had this have code for at least 4 years, but until...
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