To reset the 1999 Audi A4 service interval, please follow these instructions:
Manual Reset using Odometer and Reset Knobs:
1. Turn off the ignition.
2. Locate the Service Interval Display, which is below the odometer.
3. Do the following to display the service OIL message in the Service interval display:
i) Press and hold the TRIP ODOMETER RESET knob.
ii) Turn on the ignition – do not start the engine.
iii) Release the TRIP ODOMETER RESET knob.
4. Pull out the CLOCK ADJUSTMENT knob.
5. Press and hold the TRIP ODOMETER RESET knob until the message changes to service INSP, then release the knob.
6. Pull out the CLOCK ADJUSTMENT knob, hold for 2 seconds and release.
7. Turn off the ignition.
8. Start the engine and verify indicator has been reset.
Manual Reset using DIS and Reset Knobs:
1. Turn off the ignition
2. Locate the Driver Information System (DIS) in the instrument panel.
3. Do the following to display the SERVICE! message in the display.
i) Press and hold the right RESET knob.
ii) Turn on the ignition – do not start the engine.
iii) Release the knob.
4. Do the following to display the next service interval (SERVICE IN ##MI)
i) Press and hold the right RESET knob.
ii) Release the knob.
5. Turn off the ignition.
6. Start the engine and verify indicator has been reset.