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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23001
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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My theft light is flashing on my1999 f-150 and it wont crank

Customer Question

my theft light is flashing on my1999 f-150 and it wont crank over. how do I reset it
Submitted: 1 year ago.
Category: Ford
Expert:  chris replied 1 year ago.

hi there


you have a anti theft system called the PATS system , it consists of a chip in the key witch a transivor reads when you turn the key on and if the chip in the key is programmed to the truck , the truck will start , if the chip is not programmed or there is a problem with the system then the theft lamp will flash fast


possible causes of this problem are

1.) fuse 30 in the interior fuse panel for the transivor is burnt out

2.) a bad transivor

3.) the keys became deprogrammed

4.) bad key


so if you have another key the truck see if it will start the truck


if not then check fuse 30 in the interior fuse panel


if that's ok , then we need a code reader to see if the trucks computer has any codes in it for a bad transivor or its telling us that there is no keys programmed to the truck , this can bebaught or rented from any auto parts store ,


we can go back and forth on this page



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