How to Reset a S550 Maintenance Message


1. Insert the key into the ignition. Turn the ignition to position 1.
2. Press and hold the arrow button on the right side of the steering wheel.
3. Press and hold the 'OK' button on the left side of the steering wheel.
4. Release the buttons when the maintenance messages screen appears on the display.
5. Press the up or down arrow button until 'Reset' is highlighted.
6. Press the 'OK' button to reset.