S6 Air Suspension Drop

[K200CWC]

Before I do battle with the dealership, is it acceptable for the air suspension to drop over, say, a week and if so what's acceptable?

Originally reported the the front air suspension was on the bump stops after 7 days and the rears had dropped as well.

Dealership changed the front right suspension unit (why they can't use nearside and offside I don't know) 

Put the car in quarantine for a week and visually it appeared to have dropped so before unlocking and getting in the car I took the following measurements:

Front OS – 704mm

Front NS – 695mm

Rear OS – 732mm

Rear NS – 710mm

 

After I started the car they changed to:

Front OS – 722mm

Front NS – 729mm

Rear OS – 729mm

Rear NS – 721mm

It's defiantly better than it was but still dropping

What are peoples thoughts on cause and levels (if any) of acceptable drop over time.

Up until Sept 2023 (2 1/2 years old) it hadn't dropped at all when left.

TAI

 

[Steve Q]

Shouldn't be dropping to the floor. It needs a diagnostic check to see if any fault codes flag up but does sound like a leaking suspension airbag. 

[Sid2020]

Front NSF drop is excessive and the other ride height changes could be attributed to that.  NSF is down and OSR has gone up. OSF and NSR slightly down but could be caused by NSF being so low just like a puncture would. You said front right had been changed so front left failing now would be logical 

[K200CWC]

2 hours ago, Steve Q said:

Shouldn't be dropping to the floor. It needs a diagnostic check to see if any fault codes flag up but does sound like a leaking suspension airbag. 

Steve, cheers for the feedback.

No messages unless it's on the desk at which point it reports a "Sports differntail Fault" and an "Air suspension: vehicle currently too low"  and a C11E2F1 and a couple of U122B00 messages.

If the suspension just drops a bit then nothing so I agree an airbag or possibly an air suspension controller that has a leek??

[K200CWC]

46 minutes ago, Sid2020 said:

Front NSF drop is excessive and the other ride height changes could be attributed to that.  NSF is down and OSR has gone up. OSF and NSR slightly down but could be caused by NSF being so low just like a puncture would. You said front right had been changed so front left failing now would be logical 

Agreed, cheers

[Steve Q]

1 hour ago, K200CWC said:

Steve, cheers for the feedback.

No messages unless it's on the desk at which point it reports a "Sports differntail Fault" and an "Air suspension: vehicle currently too low"  and a C11E2F1 and a couple of U122B00 messages.

If the suspension just drops a bit then nothing so I agree an airbag or possibly an air suspension controller that has a leek??

The car itself has detected a leak so if definitely say it's the bag. If non were working then that'd be more likely the compressor but thankfully not in this case.