2011 Mercedes G-Class Owner's Manual - Page 190

188 Warning and indicator lamps in the instrument cluster Engine Problem Possible causes/consequences and M Solutions On-board computer and displays ! (USA only) There may be a malfunction, for example: ; (Canada only) Rin the engine management Rin the fuel injection system The yellow engine diagnostics warning Rin the exhaust system lamp lights up while the R in the ignition system engine is running. Rthe fuel system The emission limit values may be exceeded and the engine may be running in emergency mode. X Have the vehicle checked as soon as possible at a qualified specialist workshop. i In some states/provinces, you are required by law to immediately visit a qualified specialist workshop as soon as the yellow Check Engine warning lamp lights up. If in doubt, check whether such legal regulations apply in the state/province in which you are currently driving. ! (USA only) The fuel system pressure is too low. The fuel filler cap is not closed correctly or the fuel system is leaking. ; (Canada only) X Check that the fuel filler cap is correctly closed. The yellow engine X If the fuel filler cap is not correctly closed: close the fuel filler diagnostics warning lamp lights up while the cap. engine is running. X If the fuel filler cap is closed: visit a qualified specialist workshop. The yellow reserve fuel The fuel filler cap is not correctly closed. warning lamp lights up X Check that the fuel filler cap is correctly closed. while the engine is X If the fuel filler cap is not correctly closed: close the fuel filler running. cap. X If the fuel filler cap is closed: visit a qualified specialist workshop. The yellow reserve fuel The fuel level has dropped into the reserve range. warning lamp lights up X Refuel at the nearest gas station. while the engine is running.