Abstract: An anti-theft car protection system has a first control unit for controlling the fuel injection to an engine. The first control unit is capable of starting the engine upon receiving an engine start instruction signal and capable of storing a first rolling code. A second control unit is provided which is capable of storing a second rolling code. The system provides an interactive communication between the first and second control units when actuated and issues "ON" signal when an ignition key cylinder of an associated motor vehicle is turned from "OFF" position to "ON" position. The system, upon receiving the "ON" signal, feeds the first control unit with the engine start instruction signal and sends the second rolling code to the first control unit. The system then compares the first and second rolling codes and issues an agreement signal upon agreement of the first and second rolling signals and issues a disagreement signal upon disagreement of these signals.