Abstract: A dual function theft prevention system including a plurality of numeric keys allowing a driver to enter a multiple digit numeric code and a magnetic strip reader for receiving and scanning an associated card with a code sequence present thereon. Also included is an ignition for actuating a conventional vehicle engine upon receipt of power and brake circuitry connected to a conventional anti-lock brake system module for engaging brakes of the vehicle upon the activation thereof and further allowing normal operation of the anti-lock brake system module upon the deactivation thereof. Finally, control circuitry is coupled to the numeric keys, magnetic strip reader, brake circuitry, and ignition. The control circuitry is adapted to provide power to the ignition and deactivate the brake circuitry upon receiving a proper multiple digit numeric code sequence via the numeric keys and subsequently receiving a proper code sequence from the magnetic strip reader.