To reset the 1999 Volvo S40 service reminder indicator, please follow these instructions:
1. Turn off ignition. Press and hold in the trip odometer RESET button. 2. Turn ignition key to position I. 3. Continue to hold in the TRIP ODOMETER button for a period of 10 seconds until the Service Reminder Indicator starts flashing, release RESET button within 5 seconds. Audible beep will be heard to signal the light has been reset. 4. Turn the ignition off and then start the engine to verify the indicator has been reset.