Originally Posted by godawgs8
I bought a 2003 gt this weekend and it only came with one key. my older brother said we could test his remote from his f250, it worked which was great but than when he reprogrammed it to his truck and locked it, and turned the alarm on it did it to my mustang too.
Anyone know how to un-program his remote from my car??
Perform the programing steps with a different FOB. It will forget any other FOB's. That is why if you want to add a FOB, the old FOBs have to be available as well.
Suggestion. If you have only one key, have an additional key made. A cheap copy will not be able to start the car, but it could be used to open an accidently locked door. It can also be used to cut a replacement key if the chip key is lost.
Also, it is possible to get a "cloned" chip key. Some Walmarts have the system that can copy a key and clone the chip.