W205 (sept.2020)...Have had intermittent auxiliary warning light flashing since December 2022 and then it went ok. Then in late March it came back and stayed in (flashing up every 10 seconds). Booked into Mercedes Southport under warranty. It turns out that it needed a new Auxiliary battery but also the main 12 volt battery was showing a fault so a brand new stop/start Varta battery was fitted. Result. Just a 'heads up' in case anyone else has this problem.
Auxiliary battery (capacitor) malfunction experience.
- Thread starter MGB
- Start date
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