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What Are the Different Types of Key Programming? Car key programming is a process that allows you to get an extra key for your car. You can program a key through a car dealer or a hardware shop, but this is usually a lengthy and expensive process. They are typically bidirectional OBD-II devices. These units can harvest PIN codes, EEPROMs, and modules from vehicles. Transponder codes A transponder code is a four-digit number that is used to identify an aircraft. Its purpose is to help Air Traffic Control (ATC