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To reset the anti-theft system on your 2006 Ford F-150, start by using your first programmed key in the ignition and turning it to the "on" position. Then, switch the key to "off," take it out, and quickly insert the second programmed key. Turn it on and off before removing it. Within 10 seconds, put in the key you want to reset, leave it on for a second, then switch it off. Keep the key in until the security light comes on, then remove it to finish the programming process. Your F-150's anti-theft system is now reset with your keys.
To reprogram the security system in a 2006 Ford F-150, first press the panic button on the remote key, followed by inserting the key into the ignition slot and turning it to the on position three times.