My 2002 Ford Explorer won't start after a diagnostic test was performed. Mechanic is stating it's due to the anti-theft device system, but they have no idea how to fix it. My 2002 Ford Explorer won't start after a diagnostic test was performed. Mechanic is stating it's due to the anti-theft device system, but they have no idea how to fix it.

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Assuming they scanned it and found theft codes, they would know what has failed. If they dont have scanning ability and say its THEFT SYSTEM because the theft light is flashing...then it is in fact a theft issue, but you need to know what about the system isnt working.

1st check, if you have a backup key at home...get it and try it. If it works...use it and make a copy and have it programmed to your car ASAP as if that one fails the car is dead till you tow it and buy 2 new keys.

If its NOT because the key failed (and they do just sometimes fail suddenly), then you need fault codes to diagnose it by a shop with an enhanced ford scanner.
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