Review on High-Quality Key Fob Replacement: 4 Button 315MHz 4D63 Chip FCC ID: CWTWB1U331 for Ford Lincoln Mercury Remote Entry by William Hood

So I programmed the key fob for my daughter's 2012 Mustang. I haven't cut the key yet. There are two ways to program the key fob on the car: one for the remote control, the other for the key. From what I've seen online, in order to program a new car fob, you must have already programmed two car fobs. I have both original keychains. To program the remote, take one of your original key fobs, plug it into the ignition and cycle it on (do not start) and off 8 times, leaving the car on for the last time. For the eighth time he will snap the door locks shut. Press the unlock button on the key fob in the ignition. The car will beep. Press the unlock button on another normal key fob, the car will beep. Press the unlock button on your new key fob and the car will beep, your new key fob has been programmed to your car! Remove the default key fob and you're done. After that you need to cut the key. I haven't cut the key yet as the big hardware store near me doesn't, you'll need to find a small hardware store or locksmith. However, in order to program a new ignition key, you need to perform a completely different process. You need to insert the first original key and turn it on (not start) and wait for the security light on the instrument cluster to go out (only takes a second or two), then turn it off and remove the second original key and quickly insert the key and turn it on and wait for the security light to go on goes out, then turn off and unplug, and finally put a new key in the ignition and turn on, wait for the security light to go off, then turn off and unplug. At this point, your remote is programmed to your car and your key is programmed to your ignition. With the new key fob you can start your car as expected.