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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 key at an hardware store or your car dealer, however these procedures are typically lengthy and expensive. A specific tool is required to execute key programming and these tools are usually bidirectional OBD-II tools. These tools can collect the PIN code, EEPROM chips, and modules of the vehicle. Transponder codes A transponder code is a four-digit code