2010 Mercedes S-Class Owner's Manual - Page 498

496 What to do if ... Driving systems Problem Possible causes/consequences and M Solutions · DISTRONIC PLUS You are gaining too rapidly on the vehicle ahead of you or or PRE-SAFE® DISTRONIC PLUS or PRE-SAFE® Brake has recognized a stationary Brake: The red obstacle on your probable line of travel. distance warning X Apply the brakes immediately. lamp comes on X Carefully observe the traffic situation. You may need to brake while driving and or maneuver to avoid hitting an obstacle. an acoustic warning sounds. Vehicle Practical hints Problem Possible causes/consequences and M Solutions The yellow fuel tank The fuel level has gone below the reserve mark. reserve warning lamp in X Refuel at the next gas station. the fuel gauge comes on while driving. Engine Problem ; The yellow engine malfunction indicator lamp comes on when the engine is running. Possible causes/consequences and M Solutions There may be a malfunction in Rthe Rthe Rthe fuel management system ignition system emission control system which affect emissions Rsystems Such malfunctions may result in excessive emissions values and may switch the engine to limp-home (emergency operation) mode. X Have the vehicle checked as soon as possible at an authorized Mercedes-Benz Center. i Some states may by law require you to visit a workshop as soon as the engine malfunction indicator lamp comes on. Check local requirements. ; The yellow engine malfunction indicator lamp comes on when the engine is running. A loss of pressure has been detected in the fuel system. The fuel cap may not be closed properly or the fuel system may be leaky. X Check the fuel cap (Y page 402). X If it is not closed properly: Close the fuel cap. X If it is closed properly: Have the fuel system checked by an authorized Mercedes-Benz Center.