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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 units. Insert a new key and turn it to the off position without triggering the engine. Repeat this procedure several times over a predetermined time period, which is usually indicated by the door locks turning or chiming. Self-programming In most modern automobiles the key fob is equipped with a microcomputer chip