How to Reset door code on 1999 expedtion?

To reset the door code on a 1999 Ford Expedition, first locate the keypad on the driver's side door. Enter the factory set code (usually found in the owner’s manual or on a card in the glove compartment). Once entered, within five seconds, press the "1/2" button, then enter your new five-digit code. Finally, press the "1/2" button again to save the new code.