I have looked up here and unable to find a solution for the issue on my car.
Initially thought it would be the airbags but not the case now as they appears to still function - found out by accident!
Basically, when I get the SLS warning on dashboard - the rear drivers side suspension is dropped low and yet the passenger rear side stays where it is.
(I had issue with needing one new airbag about 3 years ago (as garage says) and this resulted in both sides being dropped to low - I guess this is as per design - levelling out.)
When using the car jack to raise drivers rear side to a level (to where it should be) and if I open door/key in ignition and turn one position - the compression comes on and then stop. It is at this point where I can now lower the car jack, the suspension would stay where it should be - which is good as I am able to drive without any bumps etc.
But it then will lower other days later - seem to be for 'random' reason. Today when I tried the above step on a slightly sloped road it will not stay up so had to do this on a perfectly level ground and it works.
I now believe it cannot be the airbag - what other issue would this be related to? Would it be the level sensor as I thought this relates only to the headlights or does it have dual purpose?
Using INPA, I have to set the height to around 576mm as per spec - but after a drive around, the passenger side dropped slightly to around 570 and the drivers side raised to 590. I have left it as it is at the moment and hopefully this does not become an issue for driving? Is INPA ideal for setting height?
Hopefully this means a simple solution / fix and I look forward to your replies.
BMW E39 523i touring (1998)