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What Are the Different Types of Codes and How Do They Work? Modern car keys have unique chips that are unique to each vehicle, unlike older keys. This stops thieves from taking the key and putting it in the car. They are usually purchased from the dealership or cloned by locksmiths. The method of programming the key varies by manufacturer and involves turning the key to the on position, without triggering the engine, then removing it within a certain time period. Transponder Codes When a transponder gets interrogate