Insert the key into the ignition and turn it to the "I" position.
Press and hold the "Trip Odometer" reset knob.
Turn the ignition switch to the "II" position.
Release the "Trip Odometer" reset knob when the trip counter flashes off and on.
Press and hold the "Trip Odometer" reset knob until a sound is heard and the maintenance light resets.
Turn the ignition off.The 2007 Volvo S80 has a maintenance monitoring system built into the on-board computer. The system monitors driving and engine conditions to determine when regular maintenance is due, such as oil changes. When the system decides it is time for maintenance, a reminder light illuminates on the control panel. The maintenance system should be reset after the service is performed so the computer can accurately track future driving conditions.