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  1. D

    Bad cat or bad diagnosis?

    I am a new poster to this forum so be gentle. I have a 96 XLT 4.0 with 110,000 miles and a check engine light on. Two months ago, the light came on with a P0154 but last week when I was going to get the O2 sensors replaced, the code came up P0420, nothing about 0154. Pep Boys and $95 will...
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