How to Reset an Anti-Theft Device on a 2002 Mustang 3.8 Engineby David Clair
The 2002 Ford Mustang is equipped with a passive anti-theft system that immobilizes the engine when it is activated. The device is designed to prevent the engine from being started if a coded key is not used. If unauthorized access with a non-coded key is detected by the system, the anti-theft device is activated. The device must be reset for the Mustang to be able to be started and driven.
Turn the ignition off.
Insert a coded key that is programmed for the specific Mustang.
Turn the ignition to the "ON" position. Do not start the engine. Leave the ignition in this position for at least four seconds to give the computer time to recognize the coded key and reset the device. The "Theft" indicator turns off to indicate that it has reset.