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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 keeps thieves from taking the key and turning on the car. Keys can be purchased from a dealership or cloned in the locksmith's shop. 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. When a transponder is interrogated it