A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.
Possible causes
- Thermostat stuck open or opening too early
- The thermostat doesn’t open — the engine overheats
- Low coolant, air lock around the sensor
- The radiator fan or its control
- Temperature sensor
What you can do yourself
- Watch the temperature gauge, especially in traffic and in hot weather.
- Check the coolant level with the engine cold and look for leaks.
- Check the temperature on the “Sensors” tab: a warm engine holds about 85–105 °C. Staying lower for long points to the thermostat; higher means overheating.
Stop and don’t drive on if:
- The Check Engine light is flashing
- The temperature gauge is in the red or the overheating light is on
- The red oil pressure light is on
- Smoke from under the bonnet, a burning or petrol smell
- Strong jerking, knocking from the engine, or the car barely moves
The explanation comes from the error code reference in the AvtoElektrik PRO app.