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What Are the Different Types of Codes and How Do They Work? Unlike older keys, modern car keys have chips that are unique to each vehicle. stops thieves from taking the key and then turning on the car. These keys are typically purchased from a dealership or cloned by a locksmith. The process for programing the key is different for each manufacturer and involves turning the key to the off position, without triggering the engine, and then taking it off it after a specific time period. Transponder Codes Like