Remove the coolant temperature sensor.
Bmw water temperature sensor.
Clean the hole where the sensor is located.
This includes replacemet of the pi.
Using a drive socket and extension and the correct sized socket usually 19mm loosen the sensor from the engine block and remove it entirely.
Repair and replacement of the temperature sensor.
The sensor controls the fan but more importantly it controls the ecu for the fuel injection.
Here is tutorial on how to check and monitor bmw coolant water temperature on board screen.
How to replace temperature sensor on bm our website.
Make sure to clean the sensor s insert area before you reinstall the temperature sensor.
But it will also work o.
How to change the temperature sensor on a bmw k75 100.