The Mercedes C280 is equipped with a Flexible Service System, or FSS. The system calculates when the next service is due based on time and mileage. The design of the system gauges optimum oil use to reduce premature oil changes and ensure proper maintenance of other systems. After completing the required service, the system will need to be reset. By following a few simple procedures, this can be done in just a few minutes.
Turn the ignition to the "On" position but do not start the vehicle.
Press the FSS button twice within four seconds. The button may have a "1" or a "0" imprinted on or near it. This will show the days or mileage remaining until the next service is due.
Turn the ignition key to the "Lock" position within 10 seconds. This is one position back from the "On" position.
Depress and hold the FSS button while turning the ignition to the "On" position. Do not start the vehicle. This will show the days or mileage remaining until service is due again. Continue to hold the button for 10 seconds until you hear a tone. The display will indicate "10,000 miles and 365 days to next service."
Release the FSS button and turn the ignition to the "Lock" position. The reset procedure is now complete.
Turn the ignition to the "On" position but do not start the vehicle.
Press the "FSS" button for about three seconds. The display will read: "DO YOU WANT TO RESET THE SERVICE INTERVAL? CONFIRM BY PRESSING R," or it will read, "SERVICE INTERVAL? RESET WITH BUTTON."
Press and hold the "FSS" reset button until a tone sounds. The FSS will now display the reset interval.
Release the "FSS" button then turn the ignition off. The reset procedure is now complete.
