Mercury Repair Questions? Ask a Mechanic for Answers ASAP
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If the O/D light came on by itself, then you will have to have the transmission module scanned to locate the code. Once you have the code then you can start a diagnosis. I would also check the level. If the transmission fluid level is low, then it could cause the running issue as well. One other thing I think should be checked but you will likely need a scan tool for it is the throttle position sensor. This can cause some shifting issues if the TCM doesn't know how much throttle you are giving the car.
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it could be sending the wrong voltage. If it wasn't sending any voltage you would have a code for it. This is why sometimes it's best to check it's readings with a scan tool. That way you know what the computer is seeing as far as voltages go. If it needs adjustment it could affect the shifting.
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