[harkes]

Hi

UPDATE: It's not because of the below valve, but because the oil does not have the right temperature that the measurement stops at 15-17%. Oil temp must be between ~65 and 100°C and as operating temp is 110-115°C the level must be measured during warm up (pretty stupid and even more so that no information is provided in iDrive)...

IF the measurement still does not work, the next step would be to check the below valve for functionality.

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I have been having this issue for a while but finally decided to do something about it.
A bit of research revealed that the problem most likely is this valve (which I can now confirm): Hydraulic valve 11417622768

1: Disconnect battery
2: Remove undertray
3: Remove 3pc screws for waterpump
4: Disconnect waterpump and valve
5: Remove 1pc screw for valve
6: Turn valve 90° CCW (then you can get a finger behind it) and remove
7: Exercise valve/check function with 12v
8: Reinstall and see if it now works