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What Are the Different Types of Key Programming? Car key programming is a method that lets you have an additional key for your vehicle. You can program a key at a car dealer or a hardware shop, but it is typically a lengthy and expensive process. A specialized tool is needed to execute key programming and these are typically bidirectional OBD-II tools. 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