Unhook your battery for a 15 minutes and reconnect it.And then try.Disconnecting and reconnecting the battery resets the system and this resets the anti theft device too.-------- Another thing are you using right key for your car.If there are 2 keys try both keys one by one. But if this not reseting the device then it has to be done by a scan tool at ford dealer.They will reset the system as well as reset /reprogram the car key too.At dealer they charge approx $35 for this resetting.Its their service charge.This antitheft light starts flashing,if the vehicle detects there is parts replaced,without disconnecting battery or car got open with key or by non -programmed key.And this problem is faced by many other ford users too.In some case battery reset helps in other cases the car needs to be reset by scan tool at dealer.----------This will help.Thanks.Helpmech.
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