BMW Questions? Ask a BMW Repair Expert for Answers.
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Your model uses ride height sensors in the rear one on each side.If one of these has failed and is sending an incorrect vehicle ride height signal this issue here will occur and in allot of cases may not set a code or warning light as the suspension computer will think that this is the actual level of the vehicle due to a dip in the road.
The other issue is a leaking shock in the rear that is sagging needing replaced but usually this causes a warning light to come on and codes to set.
I would have the shock/struts checked for leaks first.If these are all checked and found o.k. then a fully compatible scan tool is needed to observe the ride height to locate if a sensor is the cause needing replaced.I show the right rear sensor cost of $19 and usually less then a half hour to replace.Part number***********
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Do you know if the dealer calibrated the suspension system after the battery was replaced?If they did not do this,this needs done with their computer/scan tool.There are several models where this calibration needs done after battery power loss or the suspension will act up like this here.
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It sounds like they may need to do a calibration to correct this here.I know there are several models that this needs done to after battery power loss issues and since there are no codes and air bags and sensors are o.k. and you can actuate the compressor with the scan tool this usually indicates all circuits and components are o.k. but I suspect the calibration needs done.
I would call them and see if they can do this as well if they will charge for this as some places do it at no charge after a battery replacement.Usually this has to be done on their scan tool/computer unless the generic scan tool has the function to go into the suspension computer and do a relearn/calibration.Each after market scan tool is different so this would usually take a higher end scan tool.
Usually it is a fairly straight forward procedure.The scan tool is plugged in.Then the suspension computer is accessed with the scan tool.Once this is done if there is a relearn,program,calibrate or reset function on the snap on scan tool under the suspension computer you can check and see if there is a calibration procedure.It is usually a push of a button on the scan tool to calibrate and it does it itself from there.On some models though this will require a dealers tool and I have seen some even involve more tools and an alignment machine to calibrate the system.