Perform adjustments to the control system - AR54.30-P-1000-02GZC

Check engine oil level 

The vehicle must be parked horizontal for at least 5 minutes with the engine switched off at operating temperature. Otherwise there may be measurement errors

1. Switch on ignition.
2. Press the system selection button (S110s3) repeatedly until the kilometer reading is displayed in the multifunction display (A1p13).
3. Press scroll forward/back button (S110s1) repeatedly until "Engine oil level measurement in progress" appears in multifunction display (A1p13).
   Fig 1: Identifying Multifunction Display And System Selection Button

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
4. Engine oil level is shown in multifunction display (A1p13).
5. Correct the engine oil level if necessary and check engine oil level again.
6. Switch off ignition.