Ford Explorer Sport Trac 2005 Manual De Uso página 372

Locks and Security
7. Within twenty seconds of removing the previously programmed coded
key, insert the unprogrammed key (new/valet key) into the ignition.
8. Turn the ignition from the 2 (LOCK) position to the 4 (ON) position.
Keep the ignition in the 4 (ON) position for at least one second.
9. Your new unprogrammed key is now programmed.
If the key has been successfully programmed it will start the vehicle's
engine and the theft indicator light will illuminate for three seconds and
then go out. If the key was not successfully programmed, it will not start
your vehicle's engine and the theft indicator light will flash on and off
rapidly. If failure repeats, bring your vehicle to your dealer to have the
new key(s) programmed.
To program additional new unprogrammed key(s), repeat this procedure
from Step 1 for each additional key.
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2005 P207 Explorer Sport Trac (p27)
Owners Guide (post-2002-fmt)
USA_English (fus)