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What Are the Different Types of Key Programming? Car key programming is a process that lets you have an extra key for your car. You can program a key through an auto dealer or hardware shop, but this is usually a long and costly procedure. A tool that is specialized is required to carry out key programming and these are typically bidirectional OBD-II tools. These devices can collect PIN codes, EEPROMs and modules from the vehicle. Transponder codes A transponder code is a four-