So my Mustang GT (2003) decides that it is stolen back in October. The car has not started since then. It will turn over but it will not start. I checked the crank position sensor, the cam position sensor, every other sensor, battery connections, starter connections, all the fuses and relays, and even the alternator and electrical ground. I tried using both keys in the ignition, the doors, I used both keyless remotes, I set the panic, and even the trunk release. I did all this while inside and outside the car. I got crazy one day and tried about a hundred different combinations of opening the door, closing it, using the key, using the keyless...all to no avail and I am stumped. My Sniper system won't even work when I plug it in. I spent $80 and towed it to the dealer just to pay $100 for 1 hour of diagnostics and all they could tell me was that they need a few more hours with it and they still might not be able to figure it out. I'm no Ford dealer but I'm pretty sure I need a new computer (ECU) for this car. I would like to know if anyone has any first hand experience with this type of incident. I am aware that the Anti Theft systems on Mustangs are different from 96-99 and then 00-02, so the tricks used for those years will not work (already tried them). I already used the search feature and I checked several other websites but I could not find any definitive answers pertaining to my year Mustang. Any advice or information is greatly appreciated...

 

It might be a PATS thing. Does your "THEFT" light flash rapidly when you are trying to start the car? I have a spare key that is not programmed (keep it in my wallet in case I'm locked out), that is what mine does if I try to use that key (cranks over, won't fire).

 

Actually, I forgot to include that in my post. The anti-theft light does flicker rapidly and the mileage display has lines going through it...is there a way to fix this that I haven't yet tried...??

 

There's a PATS Sticky on here somewhere that might be helpful to your situation.