i changed the key switch out and the theift light is on now. what can I do as the car will not start?
No new keys and lock
If it has a chip in key it may have to be programmed to your computer in your car.
The theft light is flashing because the PATs system can not read your new keys. Unfortunately you are going to have to return to your dealer so they can program the new key to your PATs system in order for the transceiver to read then and allow the car to start. Good luck. Hope this helps.
Looking for a Used Mustang in your area?
CarGurus has 39,716 nationwide Mustang listings starting at $1,895.
Search Ford Mustang Questions
Ford Mustang Experts
Related Models For Sale
Used Cars For Sale