Page 247 of 386
Display messagesPossible causes/consequences and M Solutions
b
Check Left High
Beam or Check Right
High Beam
The left or right-hand high beam is defective.
X Check whether you are permitted to replace the bulb yourself
(Y page 122).
or
X Visit a qualified specialist workshop.
b
Check Left License
Plate Lamp
Page 248 of 386
Display messagesPossible causes/consequences and M Solutions
b
Check Left Daytime
Running
Light or Check
Right Daytime RunZ
ning Light
The left or right-hand daytime running lamp is faulty.
X Visit a qualified specialist workshop.
b
Active Light SysZ
tem Inoperative
The active light function is faulty.
X Visit a qualified specialist workshop.
b
Malfunction See
Operator's Manual
The exterior lighting is defective.
X Visit a qualified specialist workshop.
b
Auto Lamp Function
Inoperative
The light sensor is defective.
X Visit a qualified specialist workshop.
b
Switch Off Lights
The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
X Turn the light switch to Ã.
Engine
Display messagesPossible causes/consequences and M Solutions
+
Check Coolant
Level See OperaZ
tor's Manual
The coolant level is too low.
! Avoid making long journeys with too little coolant in the engine
cooling system. The engine will otherwise be damaged.
X Add coolant, observing the warning notes before doing so
(Y page 303).
X If coolant needs to be added more often than usual, have the
engine coolant system checked at a qualified specialist work-
shop.
?The fan motor is faulty. XAt coolant temperatures below 248 ‡ (120 †), drive to the
nearest qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. drivin g in moun-
tainous terrain, and stop-and-go traffic.
246Display messages
On-board computer and displays
Page 249 of 386
Display messagesPossible causes/consequences and M Solutions
?
Coolant Too Hot
Stop Vehicle Turn
Engine Off
The coolant is too hot.
A warning tone also sounds.
GWARNING
Do not drive when your engine is overheated. This can ca use some
fluids which may have leaked into the engine compartment to
catch fire.
Steam from the overheated engine can also cause serious burns
which can occur just by opening the hood.
There is a risk of injury. X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Secure the vehicle against rolling away ( Y page 168).
X Wait until the engine has cooled down.
X Make sure that the air supply to the engine radiator is not
blocked, e.g. by snow, slush or ice.
X Do not start the engine again until the display message g oes out
and the coolant temperature is below 248 ‡ (120 †). Other-
wise, the engine could be damaged.
X Pay attention to the coolant temperature display.
X If the temperature increases again, visit a qualified specialist
workshop immediately.
Under normal operating conditions and with the specified coolant
level, the coolant temperature may rise to 248 ‡ (120 †).
Display messages247
On-board computer and displays
Z
Page 250 of 386
Display messagesPossible causes/consequences and M Solutions
#The battery is not being charged.
A warning tone also sounds.
Possible causes are: R
a defective alternator
R a torn poly-V-belt
R a malfunction in the electronics
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Secure the vehicle against rolling away ( Y page 168).
X Open the hood.
X Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise ov erheat.
X Consult a qualified specialist workshop.
If the poly-V-belt is not damaged: X Visit a qualified specialist workshop.
4
Check Engine Oil
At Next Refueling
The engine oil level has dropped to the minimum level.
A warning tone also sounds.
! Avoid long journeys with too little engine oil. The engine will
otherwise be damaged.
X Check the oil level when next refueling, at the latest
(Y page 301).
X If necessary, add engine oil ( Y page 302).
X Have the engine checked at a qualified specialist workshop if
engine oil needs to be added more often than usual.
Information on approved engine oils can be obtained from any
qualified specialist workshop or on the Internet at http://
bevo.mercedes-benz.com.
8
Fuel Level Low
The fuel level has dropped into the reserve range. X Refuel at the nearest gas station.
CThere is only a very small amount of fuel in the fuel tank.
X Refuel at the nearest gas station without fail.
248Display messages
On-board computer and displays
Page 251 of 386
Display messagesPossible causes/consequences and M Solutions
8
Gas Cap Loose
The fuel system pressure is too low. The fuel filler cap i s not closed
correctly or the fuel system is leaking.
X Check that the fuel filler cap is correctly closed.
If the fuel filler cap is not correctly closed: X Close the fuel filler cap.
If the fuel filler cap is correctly closed: X Visit a qualified specialist workshop.
¸
Replace Air Filter
Vehicles with a diesel engine: the engine air filter is di rty and must
be replaced.
X Visit a qualified specialist workshop.
!
Check Fuel Filter
Vehicles with a diesel engine: there is water in the fuel filter. The
water must be drained off.
X Visit a qualified specialist workshop.
¯
Refill AdBlue At
Workshop See OperZ
ator's Manual
The DEF level has fallen below the reserve range. A warning tone
also sounds.
X Have DEF refilled as soon as possible at a qualified specialist
workshop.
¯
Refill AdBlue At
Workshop No Start
in .. km
The DEF level is only sufficient for the indicated dista nce. A warn-
ing tone also sounds.
X Have DEF refilled as soon as possible at a qualified specialist
workshop.
¯
Refill AdBlue At
Workshop Eng.
Start Not Possible
The DEF tank is empty. A warning tone also sounds. You can no
longer start the engine.
X Consult a qualified specialist workshop immediately.
¯
Check AdBlue See
Operator's Manual
The DEF system is malfunctioning. A warning tone also sounds.
X Visit a qualified specialist workshop.
Display messages249
On-board computer and displays
Z
Page 252 of 386
Display messagesPossible causes/consequences and M Solutions
¯
Eng. Start Not PosZ
sible In ..km
The DEF system is malfunctioning. A warning tone also sounds.
X Visit a qualified specialist workshop immediately.
¯
Eng. Start Not PosZ
sible
The DEF system is malfunctioning. A warning tone also sounds.
You can no longer start the engine.
X Consult a qualified specialist workshop immediately.
Driving systems
Display messagesPossible causes/consequences and M Solutions
À
Attention Assist:
Take a Break!
Based on certain criteria, ATTENTION ASSIST has detecte d fatigue
or a lack of concentration on the part of the driver. A warning tone
also sounds.
X If necessary, take a break.
During long journeys, take regular breaks in good tim e so you get
enough rest.
À
Attention Assist
Inoperative
ATTENTION ASSIST is inoperative.
X Visit a qualified specialist workshop.
ë
Off
The HOLD function is deactivated. The vehicle is skidding.
A warning tone also sounds.
X Reactivate the HOLD function later ( Y page 184).
The HOLD function is deactivated. When the brake pedal i s firmly
depressed, an activation condition is not fulfilled.
A warning tone also sounds.
X Check the activation conditions for the HOLD function
(Y page 184).
Radar Sensors DeacZ
tivated See OperaZ
tor's Manual
The radar sensor system is deactivated.
X Switch on the radar sensor system ( Y page 233).
250Display messages
On-board computer and displays
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Display messagesPossible causes/consequences and M Solutions
Lane Keeping
Assist Currently
Unavailable See
Operator's ManZ
ual or Active Lane
Keeping Assist CurZ
rently Unavailable
See Operator's ManZ
ual
Lane Keeping Assist or Active Lane Keeping Assist is deact ivated
and temporarily inoperative. Possible causes are:
R the windshield in the camera's field of vision is dirty.
R visibility is impaired due to heavy rain, snow or fog.
R there have been no lane markings for an extended period.
R the lane markings are worn, dark or covered, e.g. by dirt or snow.
When the causes stated above no longer apply, the display mes-
sage disappears.
Lane Keeping Assist or Active Lane Keeping Assist is operational
again.
If the display message does not disappear:
X Pull over and stop the vehicle safely as soon as possible, p aying
attention to road and traffic conditions.
X Secure the vehicle against rolling away ( Y page 168).
X Clean the windshield.
Lane Keeping
Assist InoperaZ
tive or Active Lane
Keeping Assist
Inoperative
Lane Keeping Assist or Active Lane Keeping Assist is defective.
X Visit a qualified specialist workshop.
Display messages251
On-board computer and displays
Z
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Display messagesPossible causes/consequences and M Solutions
Blind Spot Assist
Currently UnavailZ
able See OperaZ
tor's ManZ
ual or Active Blind
Spot Assist CurZ
rently Unavailable
See Operator's ManZ
ual
Blind Spot Assist or Active Blind Spot Assist is temporarily inop-
erative. Possible causes are:
R the sensors are dirty.
R function is impaired due to heavy rain or snow.
R the radar sensor system is outside the operating temperature
range.
R the radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio sta-
tions or other sources of electromagnetic radiation.
The yellow 9 indicator lamps also light up in the exterior mir-
rors.
When the causes stated above no longer apply, the display mes-
sage disappears.
Blind Spot Assist or Active Blind Spot Assist is operational again.
If the display message does not disappear:
X Pull over and stop the vehicle safely as soon as possible, p aying
attention to road and traffic conditions.
X Secure the vehicle against rolling away ( Y page 168).
X Clean the sensors ( Y page 309).
X Restart the engine.
Blind Spot Assist
InoperaZ
tive or Active
Blind Spot Assist
Inoperative
Blind Spot Assist or Active Blind Spot Assist is defective.
The yellow 9 indicator lamps also light up in the exterior mir-
rors. X Visit a qualified specialist workshop.
Park Assist CanZ
celed
The driver's door is open and the driver's seat belt has not been
fastened. X Repeat the parking process with the seat belt fastened and the
driver's door closed.
You have inadvertently touched the multifunction steering wheel
while steering intervention was active.
X While steering intervention is active, make sure that the multi-
function steering wheel is not touched unintentionally.
The vehicle has started to skid and ESP ®
has intervened.
X Use Active Parking Assist again later ( Y page 189).
252Display messages
On-board computer and displays
