How do you program key fob on 2003 ford truck?

To program a key fob for a 2003 Ford truck, first, sit inside the vehicle with all doors closed. Insert the key into the ignition and turn it to the "On" position (not starting the engine) and then back to "Off" eight times within 10 seconds. The doors should lock and unlock, indicating the vehicle is in programming mode. Finally, press any button on the key fob to program it; the locks will cycle again to confirm programming, and you can program additional fobs if needed.