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What Are the Different Types of Codes and How Do They Work? Contrary to older keys car keys are equipped with specific chips in them that are unique to each vehicle. This prevents thieves from just using the key to start the car. They are usually purchased from the dealership or copied by a locksmith. The process of the manufacturer varies, but it involves turning the ignition key to the "on" position, without starting the car and then removing it within the specified time. Transponder Codes When a t