How to Reset an FSS on a Mercedes E350

1. Insert the key into the ignition and turn it to the first position. This is where the ignition comes on, but the engine does not start. The lights on the dash should illuminate and the FSS display will turn on.
2. Press the 'R' button twice. This is the button located directly beneath the FSS display, which is also marked 'mileage.' The number of days and miles remaining on the current service interval will show on the screen.
3. Turn the key back to the 'off' position. Then, hold down the 'R' button and turn the key back to the same position. Continue holding the button until a beeping sound is heard. The system has now been reset and you may release the button.