How do you reprogram 2005 ford explorer sport track door code?

To reprogram the door code on a 2005 Ford Explorer Sport Trac, first ensure all doors are closed. Then, insert the key into the ignition and turn it to the "On" position without starting the engine. Press the "1/2" button on the keypad, then enter the factory code (usually found in the owner’s manual or on a label in the glovebox) followed by the “Enter” button. Finally, enter your new five-digit code, which will replace the old one.