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What Are the Different Types of Codes and How Do They Work? Unlike older keys, modern car keys have chips in them that are unique to each car. This helps to prevent thieves from taking the key and then starting the car. These keys are typically purchased from the dealership or copied by a locksmith. The process for programing the key differs by manufacturer and involves turning the key to the off position without starting the engine, and then taking it off it within a predetermined time period. Transponder Codes When a trans