Mercury Repair Questions? Ask a Mechanic for Answers ASAP
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If the theft light is flashing rapid at times when trying to start the vehicle. That means the key is damaged or worn out or the PATS transceiver around the ignition lock cylinder is faulty. When you say auto headlights are you referring to the ones that come on automatically when it gets dark or the daytime running lights that come on when the vehicle is started?
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Just to make sure I understand, your car has the daytime running light feature where as the headlights are on all the time the key is on as long as the parking brake is not applied?
If the engine will crank but not start and the theft light is flashing while doing this, then the PCM thinks your a thief and using a screwdriver to start the vehicle resulting in the computer shutting down the fuel pump and fuel injectors.