I had the battery disconnected for a long period and the instrument panel reverted to km instead of miles, I have also lost the ABS light and I have the diesel preheater light on (on a petrol car?). Is the ABS light enabled using the MB star system.
It's a fairly quick and easy job for them, they just plug into the car, inspect the speedo
and select Miles instead of the Kilometers on their laptop and then log out. 5 minutes work.