It works like a normal OBDII code reader but also has functions for communicating with system modules. Works well. I wouldn't advise you to get involved in things you don't fully understand. This is a technical tool for professional use. I'm a certified technician and it's perfect for diagnosing my BMW on the road. A good tool for motorists who understand how to use it. I see someone creating more problems for themselves by trying to use it incorrectly. Good product at a decent price
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