Abstract: An anti-theft alarm system designed for use with a motor vehicle such as an automobile which includes a logic control assembly activated by a transmitted, coded signal being sent to a receiver and decoder connected to the logic control system for the activation and operation of a fuel valve control mechanism, an ignition control and associated timer mechanism, and a mobile transmitter structure mounted on and carried with the motor vehicle. Activation of the system may occur by authorized personnel calling into a central telephone switching office by means of a conventional subscriber, touchtone telephone or a cellular telephone.