Ford 2003 Explorer Owner's Manual page 64

Locks and Security
Replacement keys
If your keys are lost or stolen and you don't have an extra coded key,
you will need to have your vehicle towed to a dealership. The key codes
need to be erased from your vehicle and new coded keys will need to be
programmed.
Replacing coded keys can be very costly. Store an extra programmed key
away from the vehicle in a safe place to help prevent any
inconveniences. Please visit an authorized dealer to purchase additional
spare or replacement keys.
Programming spare keys
You can program your own coded keys to your vehicle. Please read and
understand the entire procedure before you begin.
Tips:
• A maximum of eight keys can be coded to your vehicle.
• Only use Securilock
• You must have two previously programmed coded keys (keys that
already operate your vehicle's engine) and the new unprogrammed
key(s) readily accessible.
• If no previously programmed coded keys are available, you must take
your vehicle to your dealer to have the spare key(s) programmed.
1. Insert a previously programmed
coded key into the ignition.
2. Turn the ignition from the 3
(OFF) position to the 4 (ON)
position. Keep the ignition in the 4
(ON) position for at least one
second, but no more than 10
seconds.
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