How do you program a key less remote for a 1998 ford expedition?

Answer 1

Replacing lost transmitters Take all your vehicle's transmitters to your dealer for reprogramming if: ² a transmitter is lost or ² you want to purchase additional transmitters (up to four may be programmed). To reprogram the transmitters, place the key in the ignition and switch from OFF to ON eight times in rapid succession within 10 seconds. After doors lock/unlock, press any button on all transmitters (up to four). When completed, switch the ignition to OFF. All transmitters must be programmed at the same time.