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Car Key Reprogramming Reprogramming a car key entails changing the chip on the replacement key to make it compatible for your vehicle. It is more efficient than ordering a key from the dealer, and you can save money. This procedure is typically performed by an experienced locksmith. They will use a tool that connects to the OBD-II port and uses specific software for your vehicle. What is key programming? Car key reprogramming is the process of changing the blank chip in your replacement or