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1. Put key in ignition and rapidly cycle from "off" to "on" eight times. (not “start” but “on” position). Leave the final cycle remaining in the “on” position.
2. The doors will lock and unlock indicating your Mustang is in “program mode”.
3. Press any button on the keyless entry remote and it will be programmed.
4. At this point you can program other remotes you may have, (up to a total of four), by pressing any of their buttons.
5. Turn the key off when you are done, and test remotes.