I have one key and one key fob programmed. If I do the turn on/off 8 times and program a new key fob, the old one gets unprogrammed. How do I add another key fob?
Second question, is it possible to program a second key if you only have 1 or do you have to go to a dealer/locksmith?
You can cut a key and it will open the doors and trunk but it will not start the car due to the chip not being programmed.
You need two keys to program a third key.....otherwise a valet who knows Mustangs can park your car, cut a copy and program it in the time it takes you to eat a meal.
As for programming the remotes and keys,....it's actually written in the owners manual on how to do so, along with disabling and enabling the seatbelt warning chime