Engine

Display messages Possible causes/consequences and Solutions
Level See Operator's Manual

Check Coolant Level See Operator's Manual

 The coolant level is too low.
  • Add coolant, observing the warning notes when doing so ().
  • If coolant needs to be added more often than usual, have the engine coolant system checked at a qualified specialist workshop.
Level Low Stop Vehicle Turn Engine Off

Coolant Level Low Stop Vehicle Turn Engine Off

 The coolant is too hot.
  • Pull over and stop the vehicle safely and switch off the engine, paying attention to road and traffic conditions.
  • Make sure that the air supply to the engine radiator is not blocked, e.g. by snow, slush or ice.
  • Wait until the display message disappears before restarting the engine. Otherwise, there is a risk of engine damage.
  • Pay attention to the coolant temperature display.
  • If the temperature increases again, visit a qualified specialist workshop immediately.

The poly-V-belt may have torn.

  • Pull over and stop the vehicle safely and switch off the engine, paying attention to road and traffic conditions.
  • Open the hood.
  • Check whether the poly-V-belt is torn.

If the poly-V-belt is torn:

Do not continue driving. The engine could otherwise overheat.

  • Consult a qualified specialist workshop.

If the poly-V-belt is not damaged:

  • Wait until the display message disappears before restarting the engine. Otherwise, there is a risk of engine damage.
  • Pay attention to the coolant temperature display.
  • Visit a qualified specialist workshop.
The engine fan is defective. The engine fan is defective.
  • At coolant temperatures under 248 ‡ (120 † ), drive to the next qualified specialist workshop.
  • Avoid subjecting the engine to heavy loads, e.g. driving in mountainous terrain, and stop-and-go traffic.
The battery is not being charged. Possible causes are: The battery is not being charged. Possible causes are:
  • a defective alternator
  • a torn poly-V-belt
  • a malfunction in the electronics

 

  • Pull over and stop the vehicle safely and switch off the engine, paying attention to road and traffic conditions.
  • Open the hood.
  • Check whether the poly-V-belt is torn.

If the poly-V-belt is torn:

Do not continue driving. The engine could otherwise overheat.

  • Consult a qualified specialist workshop.

If the poly-V-belt is not damaged:

  • Visit a qualified specialist workshop.
The engine oil level has dropped to the minimum level. The engine oil level has dropped to the minimum level. A warning tone also sounds.
  • Check the engine oil level at the latest when next refueling ().
  • If necessary, add engine oil ().
  • If engine oil needs to be added more often than usual, have the engine checked at a qualified specialist workshop.
Low

Fuel Level Low

 The fuel level has dropped into the reserve range.
  • Refuel at the nearest gas station.
There is only a very small amount of fuel in the fuel tank. There is only a very small amount of fuel in the fuel tank.
  • Refuel at the nearest gas station without fail.
Loose

Gas Cap Loose

 The fuel system pressure is too low. The fuel filler cap is not closed correctly or the fuel system is leaking.
  • Check that the fuel filler cap is correctly closed.

If the fuel filler cap is not correctly closed:

  • Close the fuel filler cap.

If the fuel filler cap is correctly closed:

  • Visit a qualified specialist workshop.
Cruise Control Inoperative Cruise control is defective. A warning tone also sounds.
  • Visit a qualified specialist workshop.
Cruise Control --- mph A condition for activating cruise control has not been fulfilled. You attempted to save a speed of less than 20 mph (30 km/h).
  • If the situation allows, drive faster than 20 mph (30 km/h) and save the speed.
  • Check the activation conditions for cruise control ().

Information on approved engine oils can be obtained from any qualified specialist workshop or on the Internet at http://www.mbusa.com (USA only).

is a risk of engine damage. The oil level is too low. Avoid long journeys with too little engine oil. There is a risk of engine damage.

The display messages and the corresponding symbol that indicate that the oil level is too low must not be ignored.

See also:

PRE-SAFE® (preventative occupantprotection)
WARNING   The PRE-SAFE® system reduces the impact of an accident on vehicle occupants, as long as their seat belts have been fastened correctly. Although your vehicle is equipped with a ...

Coolant temperature display
WARNING Driving when your engine is overheated can cause some fluids which may have leaked into the engine compartment to catch fire. You could be seriously burned. Steam from an overheate ...

Activating/deactivating the radar sensor system
The following systems are switched off when the radar sensor system is deactivated: • DISTRONIC PLUS • BAS PLUS • PRE-SAFE® Brake • Blind Spot Assist • Active Blind Spot Assist USA on ...