Resetting Service Indicator: - Simply press and hold the trip mileage button, the one with '000.0' on, prior to turning on the ignition. Then turn on the ignition and continue to hold the button while the screen counted down from 10 to 0. Hey presto spanner reset.
With the ignition off press and hold the trip reset button. Then turn on the ignition, and continue to hold the trip button. The trip display will count down from 10 to 0. Continue to hold until it reaches 0 and the mileage to next service will then be reset to 12500 miles
Lmartin, March 2008