Temperatures sensors work with the machine's computer system to measure/monitor engine temperatures including the lube/oil and coolant in order to control radiators, cooling fans and thermostats
If the sesnor fails, a warning light will usually show up on the machine's gauge and can cause overheating which can lead to serious issues if not replaced
Note: Water temperature sensor for Yamaha apps, air temp sensor for Arctic Cat and Suzuki
Also fits many other machines (ATV, MC, MX & UTV)