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What Are the Different Types of Key Programming? The process of programming a car keys allows you to have an extra key for your car. You can program a key through a car dealer or a hardware shop, but this is usually a long and expensive procedure. A tool that is specialized is required to perform key programming, and these are typically bidirectional OBD-II tools. These devices can collect PIN codes, EEPROMs, and modules from vehicles. Transponder codes A transponder is a four digit code that is used to identify an aircraft. It