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Car Key Reprogramming Car key reprogramming is the process of reprogramming a blank chip in a car key replacement to make it compatible with your vehicle. It's more efficient than buying a new key from a dealer and could save you money. This procedure is typically performed by an expert locksmith. They will use a tool that connects directly to the OBD-II connector and then uses software that is specific to your vehicle. What is key programming? Reprogramming your car key is the