Rear air suspension bags
 

How many people here had to replace rear bags? I thought someone had to swap 3 out of 4. I have only changed my front bags mainly because car was sagging on the front end from the beginning. Also thinking the front bags carry bigger loads and larger in size with more chances to have a weak spot. I realize now I might have to replace rear bags as well to be absolutely sure there are no leaky bags. Besides the fact my X now almost sitting on the rear fenders for a few weeks. Front end stays up ever since I swapped old bags for new once from Arnott. Rear once are cheaper @ 200 a pair, mainly labor. Should not be harder than the front. Anybody who had to update rear bags please let me know.
PS: thank you Weasel for very valuable info.

under the spare tire will be a 2 cross metal pieces remove that and after that there should be a plastics piece held down with philipps screw remove that and you sholud see the baterry and all the module there around the baterry

about the location of the leveling module
 

my mechanic could not find the self leveling module,so he did a litle research and he finaly found it in the glow box compartemnt area...you will need to take out the whole glow box though...and its gonna be undernith there somewhere...its a long grey box with this part # on it
3714 6773999-01....wich is gonna cost you arround 700$ to replace....good luck to you

same problem
 

i have the same problem with suspension the compressor goes on for couple of seconds then its stop and few seconds later relice the air did you figure out the problem?

I just replaced all of my air bags. Now my compressor is coming on intermittently but at least the air isn't leaking out anymore. The problem is trying to figure out if it's the module or the compressor itself...

hi....just wanted for a while now to get back to yall and let you know that the best way to fix this issue is to just take the SLS out and replace it with the traditional coil/spring susspension..... i had so much trouble and spent so much money trying to figure it out,my mechanic couldnt find what the problem was....so he just converted it to the old traditional way.....
from what he told me,he just ordered all the parts nedded for a 2004 or 2006 on coil,(springs struts etc.....)they fit just right....i end up spending arround 1200$ on the job,but i can finally say i enjoy my 2003 X5 4.4i :D
plus i sold all the working air components(struts air compresor and back air bags) on ebay,and after doing the math i only had to pay out of my pocket 200$ for taking care of this never ending SLS problem....

The air suspension control module for EHC2 is located behind of the glove box, for EHC1 is adjacent to the battery tray in the trunk. Don't get wrong with this.

Guys, take a look at the sensor links. With time, they rust in the ball socket, and don't move smoothly anymore. For a quick test, take the black plastic rod between your thumb and index, and try to pivot L-R the rod over the balls. If it moves freely, it is ok, if not, replace it or try to lube them.
My front ones were rusted solid, I had to replace them.

Do you mean you had to replace the rods only or the sensors?

Voltages
 

Been having trouble with this too and have replaced more or less everything or at least tried different components. I have an error when a pressure change is requested the accumulator pressure remains constant but changed valve block, control unit and sensor on accumulator and compressor. Have just noticed on autologic that 3 of my sensors when I push down on car voltage goes down but the front left goes up opposite to the other three so just replace the sensor and its still opposite with the voltage going up not down. Does anyone have any ideas or know what there voltages do when the sensor moves