1. Press any one of the trip computer buttons repeatedly (on the end of the windscreen washer stick) until you're on the "mileage to next service" screen. (It might also be saying "Change oil soon" or some other service message).
2. Press and hold one of the two trip computer buttons until the screen flashes and the mileage is reset. The service light should go off.
Theuns Pienaar, May 2015