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