I just purchased the MD802 All System. It is registered and all updates are completed and the scan tool appears to work normally. I've connected it to three of my four vehicles and scanned all the vehicle modules with no problems (2011 VW Jetta, 2002 GMC Sierra, 2008 Honda Odyssey.) However, this evening I attempted to connect it to my 1998 Nissan 200SX SE but it could not communicate with the vehicle. It did connect and communicate in OBDII mode but not in the manufacturer specific scan menu. It wouldn't even communicate with the Engine module. Is this vehicle supported? If so, what can I do to get it to communicate?