odb | Ford Thunderbird forum club group 1955-2005 models

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  1. Mach5

    ODB-II Code P0420 on 2004

    Her check engine light lit yesterday. My code reader shows P0420 (and no other codes at this time). She started idling just a little rough and shifting a bit harsher (spring allergies?). Otherwise she seems to run perfectly smooth on our daily commute. I tried searching our Forums but...
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