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What Are Car Key Programmers? Car key programmers are devices that can duplicate a transponder within the memory of a car. They can be used to replace keys that were stolen or lost. They can also be used to reset the oil service light, tire pressure warning light and many more functions. Most of these devices are bidirectional OBD II devices that work with a variety of vehicles. Some, like the Autel MaxiIM IM608S II, offer an automated and guided Smart Mode that aids novices, while experts can use Expert Mode. The Basics