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What Are the Different Types of Codes and How Do They Work? Modern car keys contain unique chips that are specific to each vehicle, in contrast to older keys. This prevents thieves from using the key to start the car. The keys can be purchased at the dealership or cloned at the locksmith's shop. varies, but it involves turning the ignition key to the "on" position, without beginning the car, and then removing the key after the specified time. Transponder Codes When a transponder is interrogated, it sends an encoded sig