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
ABS visit workshop, ESP visit workshop on 2003 E200 W211 | Wheels, Tyres, Brakes & Suspension | MBClub UK - Bringing together Mercedes Enthusiasts
Battery - W220 S-Class Encyclopedia
Red battery message ( Visit workshop) - MBWorld.org Forums
Battery Visit Workshop How To Check And Fix This Error On A Mercedes W211
W211 E55 Airmatic problem - visit workshop! | Wheels, Tyres, Brakes & Suspension | MBClub UK - Bringing together Mercedes Enthusiasts