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What Are the Different Types of Codes and How Do They Work? In contrast to older keys, modern car keys have specific chips that are unique to each vehicle. This helps prevent thieves from simply using the key to start the car. These keys are typically purchased from a dealership or cloned by a locksmith. The procedure for programming the key varies by manufacturer and involves turning the key to the on position, without triggering the engine, and then taking it off it within a predetermined time frame. Transponder Codes