This seems to be a great BMW problem. I have 2006 BMW X5 4.8is and working on this for 3 months now. My car would lower over night. Replaced the front air air bags (arnott industries for 300 each compared to BMW at 900 each plus lifetime warranty). Error code came back on. Car does now hold air and drove it about 1500 miles with light on, drove great. Everything has been checked on the car and now it is having a new ecu 2 installed. Everytime the x5 was reset, it was showing different error codes, never the same. This option isnt cheap, 700 for ecu 2 alone. No place to find it as the 4.8 is still pretty rare, bmw only. I have the Carsoft 8.3 and it will reset this error light. Program is $375 and use your laptop. You will need 15 pin (fits newer labtops) to 9 pin connector to run it. It comes with 9 pin to 9 pin, older labtops. I post again if the ecu 2 takes care of my problem. Everything else checks good on the car, the 4 ride height adjusters, 4 selnoids, pump, and air bags are the major areas to check. Make sure they are all getting proper voltage. This thing will drive you nuts. I will be sure to post when I have it fixed.