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If the alarm in your 2001 Lincoln Navigator isn't working, the initial step is to attempt a reset to potentially resolve the issue. Resetting the system is a simple process that only requires a few minutes. Start by unlocking your SUV using the physical key, then pressing the unlock button on the key fob within 20 seconds, and finally starting the ignition within the same timeframe. This should generally clear the system and allow it to reset. If you encounter persisting issues with the alarm, it is advisable to have Lincoln inspect it to ensure there are no underlying computer malfunctions.
To deactivate the theft prevention system on the Lincoln Navigator, begin by using the key to unlock a door, then press the unlock button on the key remote within 20 seconds, and finally start the car within 20 seconds while the alert sounds.