I have a 2016 C220 (RHD), and my eco stop/start has never worked since I bought the car in December last year, I have tried various things to try and find out what's wrong, but I am still none the wiser.
- I hooked up my diagnostic tester, and I found no fault codes stored.
- Searched for a secondary battery, which I later found out is only fitted to LHD models.
- Fully charged the battery twice, and retested, the battery is ok.
- Went out for local and long drives with the ac on and off.
- Drove over a long distance in both cold and warm temperatures.