I've been getting this message when I turn the AC (occasionally), when I don't turn on the AC it doesn't appear. Checked the the alternator voltage and its fine. Could it be
AIRMATIC — Display faulty visit workshop — Mercedes-Benz CLS, 5.0 л., 2006 года на DRIVE2
visit workshop warning message | Mercedes-Benz Forum
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Battery Visit Workshop! How to check and fix this error on a Mercedes W211 - YouTube
Battery Visit Workshop! How to check and fix this error on a Mercedes W211 - YouTube
Battery/ alternator visit workshop — Mercedes-Benz C-class, 2.0 л., 2001 года на DRIVE2