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What Are the Different Types of Key Programming? Car key programming is a procedure that allows you to have an extra key for your car. You can program a key at an auto dealer or hardware shop, but it is usually a long and costly process. A specialized tool is needed to perform key programming, and these are typically bidirectional OBD-II tools. These units can harvest the PIN code, EEPROM chips, and modules of the vehicle. Transponder codes A transponder is a four digit code used to identify an aircraft. Its goal is to