How do I erase a personal keyless entry keypad code from my Ford?

1. Enter the factory-set five-digit code.
2. Press and release 1•2 on the keypad within five seconds.
3. Press and hold 1•2 for two seconds. You must do this within five seconds of completing step 2.
4. All personal codes are now erased and only the factory-set five-digit code will work. 

Additional Information

How do I program a personal Keyless Entry code?
Where do I find the factory-set Keyless Entry code?