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Car Key Reprogramming Reprogramming a car key involves reprogramming the blank chip on the replacement key to make it compatible for your vehicle. It is much more efficient than buying a new key from a dealer and could save you money. Locksmiths are usually the ones who perform this process. They will use a tool that connects to the OBD-II port and uses specific software for your vehicle. What is key programming? Reprogramming your car keys is the process of changing the blank chip in your new key or replacement key to mat