Got this error on my E70 3.0SD yesterday when i was on a trip. Car felt like i drove on near no damping in the back, banged hard on the uneven roads.

What is the cause of this problem? I can hear the pump, both bags in the rear are under 2 years old and the car has not driven more than about 15-20k km after change.

Where is the air compressor located in these 7 seat x5's?