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What Are the Different Types of Codes and How Do They Work? Modern car keys contain unique chips that are unique to each vehicle, in contrast to older keys. This helps prevent thieves from simply taking the key and then starting the car. They are usually purchased from the dealership or cloned by locksmiths. The process for programing the key differs by manufacturer and involves turning the key to the on position without starting the engine, then removing it within a certain time period. Transpond