I have a 2011 LR4 and just got a P2183 engine coolant sensor fault high sensor 2. I think there is one sensor built in to the rear crossover pipe and one more near the thermostat. Live data shows coolant temp at 176 degrees at idle on a cool day Does a fault on sensor two indicate which sensor is having the issue? I have two LR4 so I may just swap the front ones and see if the code jumps to the other car.
Also, which affordable scanner would show live data for both sensors? This was one borrowed from Oreilys.