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What Are the Different Types of Key Programming? The procedure of programming a car key allows you to have a spare key for your vehicle. You can program a key at a car dealer or a hardware shop, but this is usually a long and expensive process. These units are usually bidirectional OBD-II devices. These devices can retrieve the PIN code, EEPROM chips, and modules of the vehicle. Transponder codes A transponder code is a four-digit number that is used to identify an aircraft. Its p