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What Are the Different Types of Key Programming? The process of programming a car key lets you to have an extra key for your car. You can program a new car key at an hardware store or your dealer for your car, but these procedures are typically expensive and time-consuming. They are typically bidirectional OBD-II devices. These tools can extract PIN codes, EEPROMs and modules from the vehicle. Transponder codes A transponder code is a four-digit code that is used to identify an aircraft. Its function is to help Air Traffic