Again "AUTOLEVEL SUSP INACT"

[maximus6]

I have 2 axis EHC2 air suspession. Several months ago "AUTOLEVEL SUSP INCAT" error appeared. I went to diagnostics - there was an error "Reservoir pressure remains the same at 11.6 Bar". They did all the tests and cleared the error. Everything was fine for another 6 months.

Now it again appeared with outside temperatearound 0C. The same error. Have connected BMW DIS - done all the tests - system not loosing pressure, cleared the error. Was happy for 2 days then again the same.

Also noticed that the car going up and doing (while pressing suspession adjustment button) very slowly. First comes rear part and only in 30-60 sec front.

There could be 4 options:
- replace Air Compressor in the crank (now working a little bit louder, operating temperature 99C)
- replace Air Reservoir
- replace Air reservoir Valve Unit
- replace ECU

Has somebody got the same error and how it was fixed?

Forgotten to mention that car behaves well on the road. Not lower or higher than usual.