Hi Scotty, I have a Toyota Camry 1999 4 cylinders engine, with a communication problem between the obd2 scanner and the car computer itself. Tried different scanners in different shops and all said error communicating. I cleaned all the connectors, tried checking all grounds related to the obd2 port connector and they seem fine, has 12v that powers the scanner and the signal wire has continuity end to end but keeps giving the error on screen. Car has check engine light on all the time and runs fine with it on, if the battery its disconnected to reset it the car starts ruff and runs fine when the light comes back on. Opened the computer and dint see burnt or leaking components inside. Don't know if there's a wire, fuse or relay giving issues or the computer its self.