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is the car sagging or lower than normal on front or back or any wheel? can you get the car scanned for trouble codes? most parts places will scan for free
the warning means the computer has detected a problem with the air ride suspension system.
Most likely, to work on cars today it is almost impossible to fix and diagnose with out a scanner. And even with a scanner it has to be updated all the time. I checked for bulletins and there are no obvious issues for this system. It might be a sensor or solenoid valve not releasing air(hard ride).
I hope it is not an expensive repair.