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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 in them that are unique to each car. This prevents thieves from taking the key and then starting the car. The keys are usually bought from a dealer or copied by a locksmith. The process of the manufacturer varies, but it involves turning the ignition key to the "on" position without beginning the car, and then removing the key within a specified time period. Transponder Codes The name implies that transp