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To reinitialize the anti-theft system on your Ford F-150, start by inserting the key into the ignition and turning it to the ON position. Next, insert the second programmed key that came with the vehicle into the ignition and turn it to the OFF position quickly, with minimal time between keys. Remove the second key and insert the key you want to reset immediately after. Turn this key to the ON position for a few seconds and then back to OFF. Keep the key in the ignition until the security light flashes, indicating the completion of the anti-theft reset process.
To reprogram the security system in a 2004 Ford F-150, you should first hit the panic button on your remote, then insert your key into the ignition slot and turn it to the on position three times.