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What Are the Different Types of Codes and How Do They Work? Contrary to older keys car keys have chips that are unique to each vehicle. This helps prevent thieves from just taking the key and starting the car. These keys are typically purchased from the dealership or cloned by a locksmith. The method of programming the key differs by manufacturer and involves turning the key to the off position, without triggering the engine, then removing it after a specific time period. Transponder Codes When a transponder is questioned it transmits an encoded sig