I bought new ones cant program them
If the fob is not for mercury it wont work make sure when buying that it is compatible with your car make and model, look online for instruction how to program your fob keyless remote.
SOURCE: program remote keyless entry
1) Turn key from OFF to ON eight times within 10 seconds ending in the ON position.
2) After doors lock then unlock, press any button on the
remote being programmed.
3) The doors should lock/unlock to confirm programming.
4) Turn key to OFF and door locks should cycle one last time.
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