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Key Programming Car Keys Most dealerships and brick and mortar locksmiths have tools to assist you in programming replacement keys or restore immobilizer data. These tools are typically bidirectional OBD-II devices. Insert a brand new, blank key and turn the ignition on to the "on" position, without starting the car. Repeat this procedure a number of times within a particular time period, which is typically indicated by the door lock cycling or a loud chime. Self-programming In most modern automobiles the key fob has an e