The seat heating* has switched itself off prematurely or cannot be switched on.

There is insufficient voltage because too many consumers are switched on.

The warning lamp on the sport button of the dynamic handling package with sports mode* is lit.

If you select comfort mode and the indicator lamp does not go out, the dynamic handling package with sports mode* is faulty.

The indicator lamp in the button on the Thermatic/Thermotronic* control panel is off or flashes three times when you press the button. The cooling system cannot be switched on.

Cooling has been deactivated due to a malfunction.

The rear-window heating has switched itself off prematurely or cannot be switched on.

There is insufficient voltage because too many consumers are switched on.

Vehicles with automatic child seat recognition on the front-passenger seat*:

The indicator lamp on the centre console is lit.

A special Mercedes-Benz child seat with automatic child seat recognition has been fitted to the front-passenger seat. The front-passenger airbag has therefore been disabled.

Vehicles with automatic child seat recognition on the front-passenger seat*:

The indicator lamp on the centre console is lit.

  Risk of injury

There is no child seat fitted to the front-passenger seat. The automatic child seat recognition on the front-passenger seat* is faulty.

  Risk of accident

ABS, ESP®, BAS, PRE-SAFE®*, hill start assist and ESP® trailer stabilisation are unavailable due to a malfunction.

The brake system continues to function normally, but without the functions listed above. The wheels could therefore lock if you brake hard, for example.

  Risk of accident

ESP® is deactivated. ESP® will not stabilise the vehicle if it starts to skid or if a wheel starts to spin.

  Risk of accident

ESP® Sport is activated. ESP® Sport will only stabilise the vehicle to a limited degree if it starts to skid or if a wheel starts to spin.

  Risk of accident

ESP® is deactivated. ESP® will not stabilise the vehicle if it starts to skid or if a wheel starts to spin.

  Risk of accident

ESP® is unavailable due to a malfunction. ESP® will not stabilise the vehicle if it starts to skid or if a wheel starts to spin.

  Risk of accident

ESP® or traction control has intervened because at least one wheel has started to spin.

Cruise control* is switched off.

  Risk of accident

At least one wheel is spinning and ETS is deactivated to prevent the brakes on the drive wheels from overheating.

Observe the additional messages in the multi-function display more.

ETS switches back on again as soon as the brakes have cooled down. The display message disappears and the warning lamp goes out.

You are driving with the parking brake applied.

  Risk of accident

There is insufficient brake fluid in the fluid reservoir.

The sensor for the coolant temperature gauge is faulty.

The coolant is too hot. The engine is not being cooled sufficiently and may be damaged.

The coolant temperature has exceeded 130 . The engine is not being cooled sufficiently and may be damaged.

The coolant level may be too low.

	Stop the vehicle as soon as possible. Pay attention to the traffic conditions as you do so.
	Allow the engine and coolant to cool.
	Check the coolant level. Observe the warning notes more. Top up the coolant if necessary.
	Have the coolant system checked at a qualified specialist workshop if the coolant needs topping up more often than usual.

If the coolant level is correct, the radiator fan may be faulty. In this case:

	Do not continue driving under any circumstances.
	Consult a qualified specialist workshop.

Vehicles with a diesel engine: the fuel tank has run dry.

There may be a malfunction:

• in the fuel injection system

• in the exhaust system

• in the ignition system (on vehicles with a petrol engine)

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

  Risk of injury

The restraint systems are faulty. The airbags or belt tensioners may either be triggered unintentionally or, in the event of an accident, not be triggered at all.

The seat belt warning lamp reminds the driver and front passenger to fasten their seat belts.

  Risk of injury

The driver's seat belt is not fastened.

  Risk of injury

The driver or front passenger has not fastened their seat belt.

  Risk of injury

There are objects on the front-passenger seat.

  Risk of injury

The driver or front passenger has not fastened their seat belt and you are driving faster than 25 km/h or have driven faster than 25 km/h for a short time.

  Risk of injury

There are objects on the front-passenger seat and you are driving faster than 25 km/h or have driven faster than 25 km/h for a short time.

The fuel level has fallen below the reserve range.

The alarm of the anti-theft warning system* is triggered.

You have opened the vehicle using the emergency key element without deactivating the anti-theft alarm system* first.

Switch off the alarm more.

You hear a warning tone.

A message appears in the multi-function display.

You hear a warning tone.

You are driving with the parking brake applied.

You hear a warning tone.

You did not switch off the lights when leaving the vehicle.

You hear a warning tone.

  Risk of injury

The driver or front passenger has not fastened their seat belt.

Fuel is leaking from the vehicle.

  Risk of fire

The fuel line or the fuel tank has been damaged. The leaking fuel creates a risk of fire or explosion.

	Switch off the ignition immediately.
	Remove the ignition key.

Do not restart the engine under any circumstances. The leaking fuel creates a risk of fire or explosion.

Consult a qualified specialist workshop.

You are unable to determine the extent of the damage.

You cannot detect any damage.

The NECK-PRO head restraints on the driver's and front-passenger seats have been triggered.

Your vehicle has been involved in a rear-end collision.

Fuel is leaking from the vehicle.

  Risk of explosion or fire

The fuel line or the fuel tank is defective.

The fuel filler flap cannot be opened.

The fuel filler flap is not released.

The opening mechanism is jammed.

The fuel tank of a vehicle with a diesel engine has been run completely dry.

There is air in the fuel system.

	Refuel the vehicle.
	Switch on the ignition for approximately 10 seconds (key in position 2 in the ignition lock).
	Start the engine continuously for up to 40 seconds until it runs smoothly.
	The fuel system is now free of air.

If the engine does not start:

	Wait two minutes.
	Repeat the starting procedure for up to 40 seconds.

If the engine still does not start:

Consult a qualified specialist workshop.

The engine will not start. You can hear the starter motor operating.

• There is a malfunction in the engine electronics.

• There is a malfunction in the fuel supply.

	Turn the key back to position 0 in the ignition lock before the next starting attempt.
	Try to start the engine again more. Avoid excessively long and frequent attempts to start the engine, as this will drain the battery.

If the engine does not start after several attempts:

Consult a qualified specialist workshop.

Vehicles with a diesel engine:

The engine will not start. You can hear the starter motor operating. The reserve fuel warning lamp is on and the fuel gauge shows 0.

The fuel tank has been run dry.

The engine will not start. You cannot hear the starter motor operating.

The on-board voltage is too low because the starter battery is too weak or discharged.

Jump-start the vehicle more.

If the engine does not start despite attempting to jump-start it:

Consult a qualified specialist workshop.

Vehicles with a petrol engine:

The engine is not running smoothly and is misfiring.

There is a malfunction in the engine electronics or a mechanical component of the engine control unit.

A coolant temperature of over 120 °C is displayed. The coolant warning lamp may also be on and a warning tone may sound more.

The coolant level is too low. The coolant is too hot and the engine is no longer being cooled sufficiently.

If the coolant level is correct, the radiator fan may be faulty. The coolant is too hot and the engine is no longer being cooled sufficiently.

The transmission has problems shifting gear

The transmission is losing oil.

The acceleration ability is deteriorating.

The transmission no longer changes gear.

The transmission is in emergency mode.

It is only possible to shift into 2nd gear and reverse gear.

Only the red segments in the Parktronic warning display are lit. You also hear a warning tone for approximately two seconds.

Parktronic is deactivated after approximately 20 seconds and the indicator lamp in the Parktronic button lights up.

Parktronic has malfunctioned and has switched itself off.

Only the red segments in the Parktronic warning display are lit. Parktronic is deactivated after approximately 20 seconds.

The Parktronic sensors are dirty or there is interference.

Only the red segments in the Parktronic warning display are lit. Parktronic is deactivated after approximately 20 seconds.

The problem may be caused by an external source of radio or ultrasound waves.

The headlamps or the turn signals in the exterior mirrors are misted up on the inside.

Air humidity is very high.

The headlamp housing is not sealed and moisture has been able to enter.

The windscreen wipers are jammed.

Leaves or snow, for example, may be obstructing the windscreen wiper movement. The wiper motor has been deactivated.

The windscreen wipers fail completely.

The windscreen wiper drive is malfunctioning.

A side window will not close.

An object has become trapped between the window and the door frame.

There are objects in the window guide rail which are preventing the window from being raised.

You cannot see the cause.

An exterior mirror has been pushed out of position.

Vehicles with exterior mirrors that cannot be folded in/out electrically:

Push the mirror into the correct position manually.

Vehicles with electrically folding exterior mirrors*:

	Press the mirror-folding button* more repeatedly until you hear a distinct click.
	The mirror housing is engaged again and you can adjust the mirror as usual more.

You cannot lock or unlock the vehicle using the key.

The key batteries are discharged or nearly discharged.

To do this, point the tip of the key at the driver's door handle from close range and try to unlock or lock the vehicle again.

If this does not work:

	Lock or unlock the vehicle using the emergency key element more.
	Check the key batteries more and replace them if necessary more.

The key is faulty.

The battery charge indicator lamp of the key does not go on during the test.

The key batteries are discharged.

You have lost a key.

You have lost the emergency key element.

The engine cannot be started using the key.

The on-board voltage is too low.

Switch off non-essential consumers, e.g. seat heating* or interior lighting, and try to start the engine again.

If this does not work:

	Check the starter battery and recharge it if necessary more.
or
	Jump-start the vehicle more.
or
	Consult a qualified specialist workshop.

The engine cannot be started using the key.

The steering lock is mechanically blocked.

You cannot lock or unlock the vehicle using the KEYLESS GO key.

The KEYLESS GO key batteries are discharged or nearly discharged.

Lock or unlock the vehicle using the remote control function of the key. To do this, point the tip of the key at the driver's door handle from close range and try to unlock or lock the vehicle again.

If this does not work:

	Lock or unlock the vehicle using the emergency key element more.
	Check the KEYLESS GO key batteries more and replace them if necessary more.

There is a fault with KEYLESS GO.

There is interference from a powerful source of radio waves.

The battery check lamp in the KEYLESS GO key does not light up when tested.

The KEYLESS GO key batteries are discharged.

The vehicle cannot be started using the KEYLESS GO key and the KEYLESS GO button. The KEYLESS GO key is in the vehicle.

A door is open. The key therefore cannot be detected so easily.

You did not depress the brake when starting the engine.

There is interference from a powerful source of radio waves.

You have lost the KEYLESS GO key.

The vehicle is to be left parked up for longer than six weeks.

Damage resulting from non-use may occur if the vehicle is parked up for long periods.