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Key Programming Car Keys Most dealerships and brick and mortar locksmiths have tools that can help you program replacement keys or restore immobilizer data. These tools are typically bidirectional OBD-II units. Insert the new key and switch it to the on position, without starting the engine. Repeat this process several times within a certain time period typically identified by the door locks cycling or a chime. Self-programming In modern cars the keyfob is equipped with an electronic chip that communicat