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What Are the Different Types of Codes and How Do They Work? Modern car keys contain unique chips that are specific to each vehicle, unlike older keys. This prevents thieves from simply taking the key and putting it in the car. The keys are usually bought from a dealer or copied by a locksmith. The procedure for programming the key differs by manufacturer and involves turning the key to the on position without starting the engine, and then taking it off it after a specific time frame. Transponder Codes The name implies that