Attention! We work on a cold engine. Partially drain the coolant.
Turning off the ignition..
... disconnect the sensor connector.
key «at 19» unscrew the sensor.
We take out the sensor together with the sealing ring.
To check, we lower the sensor into a vessel with coolant and heat the vessel. The temperature is controlled by a thermometer.
We measure the resistance of the sensor at different temperatures.
Install the sensor in reverse order. Sensor tightening torque 9–15 Nm.
Top up the coolant to the correct level.