rf065
MB Enthusiast
- Joined
- Jun 8, 2007
- Messages
- 5,194
- Location
- Grossbritannien
- Car
- SLC300 - C250d Estate 4 Matic & Z900rs
Both batteries need to be 100%, you'll probably find your main battery should have been replaced at the same time.Update my end: The auxiliary battery was replaced and since then the stop/start function hasn't worked once... the amber icon stays on all the time. In the two years I've had the car, the feature has only worked on a handful of occasions, usually on a long run in hot weather.