2022 Kawasaki Z650RS

[peterbaron]

I'm having some issue reading the temperature. The gauge only shows 2-1 bars, normally 3 bars, when it's cold /+15°C/60°F or lower. After manually checking both the upper and lower coolant hoses, they seem to be at the same temperature when hot, so it doesn't sound like a thermostat issue, as the temperature changes very quickly from 3 bars to 1 bar when riding cold.
When I bought this bike in mid-August, the red light came on 3x... but it went away after a few starts. Maybe it was the first warning???
I'll check the temperature of both radiator hoses again on Friday when I get back to work and grab an infrared thermometer.
The Z650RS manual doesn't even mention the resistance of the coolant temperature sensor, but I've already checked with my buddy AI and I know everything. It has an NTS thermistor, and the resistance is 2 to 3 kOhms cold and 200-300 Ohms* hot = NTS. All the hand written notes are already in my service manual for further information.
I suspect a poor contact to coolant sensor, ECM, or a faulty sensor... but that's just a guess. I hope it's not a software issue, otherwise I'll have to go to the dealer for a reprogramming next spring. The bike has a 5-year/unlimited kms warranty.
Tomorrow I'll connect an OBDII error code reader via a 16-to-6-pin adapter...

* I rented a private jet and tomorrow I'm flying to my buddy  in Virginia Beach, Virginia, to borrow his bakelite multimeter....he has two bikes, a 2012 ST and a 2013 CB1100...