Mercedes-Benz C-Class Manuals

Mercedes-Benz C-Class Owners Manual: Engine

Warning/indicator lamp

Possible causes/consequences and ► Solutions

Engine diagnosis warning lamp

The yellow Check Engine warning lamp is lit while the engine is running.

A malfunction has occurred in the engine, the exhaust system or the fuel system.

The emission limit values may be exceeded and the engine may be in emergency mode.

In some states, legal requirements stipulate that you must immediately consult a qualified specialist workshop as soon as the yellow Check Engine warning lamp lights up.

  • Have the vehicle checked as soon as possible at a qualified specialist workshop.

Electrical malfunction warning lamp

The red electrical malfunction warning lamp is lit.

There is a malfunction in the electrics.

  • Observe the messages on the multifunction display.

Fuel reserve warning lamp

The yellow fuel reserve warning lamp lights up while driving.

There has been pressure loss in the fuel system. The fuel filler cap is not closed correctly or the fuel system is leaking.

  • Close the fuel filler cap.

If the fuel filler cap has already been closed correctly:

  • Visit a qualified specialist workshop.

Fuel reserve warning lamp

The yellow fuel reserve warning lamp is lit while the engine is running.

The fuel supply has dropped into the reserve range.

  • Refuel.

Coolant warning lamp

The red coolant warning lamp is lit while the engine is running.

Possible causes are:

  • The temperature sensor is malfunctioning
  • The coolant level is too low
  • The air supply to the radiator is obstructed
  • The radiator fan is faulty

If there is an additional warning tone, the coolant temperature has exceeded the maximum permissible temperature.

WARNING Danger of burns when opening the hood
If you open the hood when the engine has overheated or during a fire in the engine compartment, you could come into contact with hot gases or other escaping operating fluids.
  • Before opening the hood, allow the engine to cool down.
  • In the event of a fire in the engine compartment, keep the hood closed and call the fire service.
  • Pull over and stop the vehicle safely and switch off the engine, paying attention to road and traffic conditions. Do not continue driving under any circumstances.
  • Observe the messages on the multifunction display.

If the coolant temperature display is at the lower end of the temperature scale:

  • Consult a qualified specialist workshop.

    or

  • Exit the vehicle and keep a safe distance from it until the engine has cooled down.
  • Check the coolant level.
  • Make sure that the air supply to the radiator is not obstructed.
  • Avoiding high loads on the engine, drive to the nearest qualified specialist workshop. In doing so, ensure that the coolant temperature display remains below the red area.

Tires

Warning/indicator lamp

Possible causes/consequences and ► Solutions

Tire pressure monitoring system warning lamp lights up

The yellow tire pressure monitoring system warning lamp (pressure loss/malfunction) is lit.

The tire pressure monitoring system has detected tire pressure loss in at least one of the tires.

WARNING Risk of an accident due to insufficient tire pressure
Tire pressures that are too low pose the following hazards:
  • The tires may burst, especially as the load and vehicle speed increase.
  • The tires may wear excessively and/or unevenly, which may greatly impair tire traction.
  • The driving characteristics, as well as steering and braking, may be greatly impaired.

You could then lose control of the vehicle.

  • Observe the recommended tire pressure.
  • Adjust the tire pressure if necessary.

  • Stop the vehicle, paying attention to road and traffic conditions.
  • Check the tire pressure and the tires.

Tire pressure monitoring system warning lamp flashes

The yellow tire pressure monitoring system warning lamp (pressure loss/malfunction) flashes for approximately one minute and then remains lit.

The tire pressure monitoring system is defective.

WARNING There is a risk of an accident if the tire pressure monitoring system is malfunctioning
If the tire pressure monitoring system is malfunctioning, it is not able to issue a warning if there is pressure loss in one or more of the tires.

Underinflated tires may, for example, impair the driving, steering and braking characteristics.

  • Have the tire pressure monitoring system checked at a qualified specialist workshop.

  • Visit a qualified specialist workshop.

Vehicle

Warning/indicator lamp

Possible causes/consequences and ► Solutions

Power steering system warning lamp

The red power steering system warning lamp is lit while the engine is running.

The power-assisted steering or the steering itself is malfunctioning.

WARNING Risk of accident if steering capability is impaired
If the steering does not function as intended, the vehicle's operating safety is jeopardized.
  • Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do not continue driving under any circumstances.
  • Consult a qualified specialist workshop.

  • Observe the messages on the multifunction display.

 

    Safety systems

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