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Transponder keys are factory-made accessories that come with a car and provide for radio transmission between the car and the key. This radio transmission allows for a key to be programmed to only start a specific, individual car. Thus, only the person who is in possession of a car’s transponder key will be able to start and drive it. Transponder keys reduce the opportunity for car thieves to steal a car.
The way transponder key programming works involves a microchip that resides in the top of the key. This microchip has a serial number, which a transponder key programmer has made unique to that key. The electronic/engine control units (ECU) will send a request to the vehicle for it to validate the serial number. If the car doesn’t recognize any serial number within its set of confirmed and correct numbers, the car will not start