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To re-enable the security system on a 2000 Ford Expedition, start by quickly turning the ignition off and on three times. On the third time, leave the ignition in the on position, release your foot from the brake pedal, and then turn the ignition off. Repeat these steps for a second time. If done correctly, the horn will sound, indicating that the process is complete and you can now use your vehicle as usual.
Switch off the ignition and step on the brake pedal. Turn the ignition on and off three times, leaving it on after the third time. Step on and off the brake pedal, then switch off the ignition. Repeat these actions once more. After the second time, a horn will sound to indicate that the sensor has been reset.