Self level sups inactive!!!

[Stanleyf233]

Hi all!

After seeing if anybody has had the same issue as this before. Car (2001 X5 4.4) has had this error message on and off since i got it a year ago. i cured it the first time after an check by the local stealer and changed the rear left sensor with one of ebay. Happy days. 3 months later same error. I then deploy and leave the car at home as i am in the military. When i came back the car is down at the back (as expected). Turn on the car on and it pumps up but on one side only. i have now changed both rear sensors for brand new from BMW and i have change both rear air springs for brand new from arnott. It seems the left side (red line) is not charging at all. anybody got any ideas as to where to look next? Cheers for the help!

Stan