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  1. D

    Bad cat or bad diagnosis?

    Here is the strangest part, yesterday I took it to the local mechanic to check the engine light out. He didn't have the code for the alarm so he disconnected the battery to stop the horn from honking which cleared the recent code but not the "history" which is stored until erased by an OBDII...
  2. D

    Bad cat or bad diagnosis?

    Thanks, will do.
  3. 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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