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Car Key Reprogramming Reprogramming a car key involves reprogramming the blank chip on a replacement key to make it compatible with your vehicle. It's much more efficient than ordering a key from the dealer, and it can save money. This procedure is typically performed by an expert locksmith. They will employ a tool that connects directly to the OBD-II connector and then uses software that is specific to your vehicle. What is the most important reprogramming? Reprogramming your car key is the process of changing a blank chip