Code 173 indicates the oxygen sensor is telling the computer that the engine is running rich.
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OBD I code 67 - Neutral Drive Switch Circuit Open ( key on , engine off )
it is a high voltage sensor...but i would like to know where it is located
diagnostic code 42 is the code ford gives for a new vehicle required. too many discrepencies to consider a worthy vehicle
An obdII code reader will tell you why the light is on and might tell you what is wrong
It means generally that there is something wrong in the engine bay. The best way to find out is have the codes read by buying a code reader yourself or taking it to an agency for an assessment. Good code readers cost about $ 100 but can save you lots.