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What Are Car Key Programmers? Car key programmers are devices that replicate a transponder into the memory of a vehicle. They can be used to replace keys that were lost or stolen. These can be used to reset the oil service light as well as warning lights for tire pressure and many other functions. The majority of these tools are bidirectional OBD II devices that work with a wide range of vehicles. Some tools, like the Autel MaxiIM IM608S II offer an automated and guided "Smart Mode" that helps beginners, while experienced