Display messages
Possible causes/consequences and
X
X Solutions j Check
trailer
hitch lock
G
Risk of accident
The trailer tow hitch* is not correctly engaged. A warning tone
also sounds.
X Pull over and stop the vehicle safely, paying attention to
road and traffic conditions.
X Engage the ball coupling in the end position (Y page 234).À Attention
Assist:
Time for
a break? Based on specific criteria, ATTENTION ASSIST has deter-
mined that your concentration has waned. A warning tone
also sounds.
X
If necessary, take a break.
During long journeys, take regular breaks in good time so you
get enough rest. À Attention
Assist
inopera‐
tive ATTENTION ASSIST is inoperative.
X
Visit a qualified specialist workshop. # The battery is not being charged. A warning tone also sounds.
Possible causes are:
R
a faulty alternator
R a torn poly-V-belt
R a malfunction in the electronics
X Pull over and stop the vehicle safely, paying attention to
road and traffic conditions and leave the engine running.
X Open the bonnet.
X Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise over-
heat.
X Switch off the engine.
X Consult a qualified specialist workshop.
If the poly-V-belt is OK:
X Visit a qualified specialist workshop. # Check
brake wear The brake pads/linings have reached their wear limit.
X
Visit a qualified specialist workshop. Display
messages
265Practical advice
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Display messages
Possible causes/consequences and
X
X Solutions J Check
brake
fluid
level
G
Risk of accident
There is insufficient brake fluid in the brake fluid reservoir. In
addition, the Jwarning lamp in the instrument cluster
lights up and a warning tone sounds.
X Pull over and stop the vehicle safely as soon as possible,
paying attention to road and traffic conditions. Do not con-
tinue driving under any circumstances.
X Consult a qualified specialist workshop.
Do not top up the brake fluid. This will not rectify the fault. J Release
parking
brake You are driving with the parking brake applied. A warning tone
also sounds.
X
Release the parking brake. J EBD, ABS
and ESP
inopera‐
tive See
Owner's
Manual
G
Risk of accident
EBV (electronic brake force distribution), ABS, ESP ®
, BAS,
PRE-SAFE ®
, the HOLD function, hill start assist and ESP ®
trailer stabilisation are unavailable due to a malfunction. In
addition, the ä,åand! warning lamps in the
instrument cluster light up and a warning tone sounds.
The brake system continues to function normally, but without
the functions listed above. ATTENTION ASSIST is deactivated.
X Drive on carefully.
X Visit a qualified specialist workshop immediately. 266
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messagesPractical advice
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Display messages
Possible causes/consequences and
X
X Solutions J Brake
immedi‐
ately A malfunction has occurred while the HOLD function or Dis-
tronic Plus* is active.
or
Vehicles with manual transmission: with the HOLD function
activated, you have either:
R
opened the driver's door and released the seat belt or
R switched off the engine or
R opened the bonnet
A tone may also sound at regular intervals. The tone becomes
louder if you attempt to lock the vehicle.
You cannot start the engine.
X Paying attention to the traffic situation, immediately
depress the brake pedal firmly and hold until the display
message disappears.
X Prevent the vehicle from rolling away before you leave it
(Y page 107).
You can restart the engine. ? Coolant
Stop vehi‐
cle
Switch
engine off The coolant is too hot. In addition, the
?warning lamp in
the instrument cluster lights up and a warning tone sounds.
X Pull over and stop the vehicle safely and switch off the
engine, paying attention to road and traffic conditions.
X Make sure that the air supply to the radiator is not blocked,
e.g. by slush.
X Wait until the display message disappears before restarting
the engine. Otherwise, there is a risk of engine damage.
X Observe the coolant temperature gauge.
X If the coolant temperature increases again, visit a qualified
specialist workshop immediately. The poly-V-belt may have torn. A warning tone also sounds.
X
Pull over and stop the vehicle safely and switch off the
engine, paying attention to road and traffic conditions.
X Check the poly-V-belt.
X If the poly-V-belt is not damaged: do not start the engine
again until the display message goes out. Otherwise, there
is a risk of engine damage.
X If the poly-V-belt is torn: do not continue driving. Consult
a qualified specialist workshop. Display
messages
267Practical advice
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Display messages
Possible causes/consequences and
X
X Solutions ? The engine fan is faulty.
X
If the coolant temperature is less than 120 †, you can
continue driving to the nearest qualified specialist work-
shop.
X Avoid subjecting the engine to heavy loads (e.g. driving in
mountainous terrain) and stop-and-go driving. + Top up
coolant
See Own‐
er's Man‐
ual The coolant level is too low.
X
Top up the coolant, observing the warning notes before
doing so (Y page 221).
X Have the engine cooling system checked at a qualified spe-
cialist workshop if the coolant needs topping up more often
than usual. ¨ Vehicle
rising
Vehicles with AIRMATIC*: your vehicle is adjusting to the level
you have selected.
¨ Vehicle
rising
Please
wait
Vehicles with AIRMATIC*: the vehicle level is too low when
stationary. A warning tone also sounds.
X
Remain stationary.
X Wait until the display message disappears.
The vehicle has reached the level required for driving. ¨ STOP vehi‐
cle Vehi‐
cle too
low
G
Risk of accident
AIRMATIC* is faulty. A warning tone also sounds.
X Do not exceed a maximum speed of 80 km/h.
X Make only slight steering movements. Otherwise, the front
wing or the tyres could be damaged when you drive on.
X Listen for scraping sounds.
X Pull over and stop the vehicle, paying attention to road and
traffic conditions, and select a higher vehicle level.
The vehicle may be raised, depending on the type of mal-
function.
X Visit a qualified specialist workshop. ¨ Malfunc‐
tion
G
Risk of accident
The AIRMATIC* function is restricted. The vehicle's handling
characteristics may be affected.
X Do not exceed a maximum speed of 80 km/h.
X Visit a qualified specialist workshop. 268
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messagesPractical advice
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Display messages
Possible causes/consequences and
X
X Solutions ! Clean the
fuel fil‐
ter There is water in the fuel filter. The water must be drained
off
41
.
X Visit a qualified specialist workshop. ¯ Refill
AdBlue at
workshop
See Own‐
er's Man‐
ual
The AdBlue
®
level has fallen below the reserve range. A warn-
ing tone also sounds.
X Have the AdBlue ®
reservoir filled as soon as possible at a
qualified specialist workshop. ¯ Refill
AdBlue at
workshop
No start
in ..km
The AdBlue
®
level is only sufficient for the indicated route. A
warning tone also sounds.
X Have the AdBlue ®
reservoir filled as soon as possible at a
qualified specialist workshop. ¯ Refill
AdBlue at
workshop
Eng.
start not
possible
The AdBlue
®
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 Own‐
er's Man‐
ual
The AdBlue
®
system is malfunctioning. A warning tone also
sounds.
X Visit a qualified specialist workshop. ¯ AdBlue
No start
in ..km
The AdBlue
®
system is malfunctioning. A warning tone also
sounds.
X Visit a qualified specialist workshop immediately. ¯ AdBlue
Eng.
start not
possible
The AdBlue
®
system is malfunctioning. A warning tone also
sounds. You can no longer start the engine.
X Consult a qualified specialist workshop immediately. 41
Only for certain countries. Display
messages
269Practical advice
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Display messages
Possible causes/consequences and
X
X Solutions D inopera‐
tive See
Owner's
Manual
G
Risk of accident
The power steering assistance is reduced. You will need to
use more force to steer. A warning tone also sounds.
X Check whether you are able to apply the extra force
required.
X If you are able to steer safely: carefully drive on to a
qualified specialist workshop.
X If you are unable to steer safely: do not drive on. Contact
the nearest qualified specialist workshop. b Left cor‐
nering
light
or
Right cor‐
nering
light
The left-hand or right-hand cornering lamp* is faulty.
X
Visit a qualified specialist workshop. b Left
dipped
beam
or
Right
dipped
beam The left-hand or right-hand dipped-beam headlamp is faulty.
X
Halogen headlamps: replace the bulb (Ypage 304).
X Bi-xenon headlamp*: visit a qualified specialist workshop.b Active
Light Sys‐
tem inop‐
erative
The active light function* is faulty.
X
Visit a qualified specialist workshop. b Trailer
left indi‐
cator
or
Trailer
right
indic. The left-hand or right-hand trailer turn signal lamp is faulty.
X
Change the bulb. b Trailer
brake lamp The trailer brake lamp is faulty.
X
Change the bulb. 270
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Display messages
Possible causes/consequences and
X
X Solutions b Trailer
left tail
lamp
or
Trailer
right
tail lamp The left-hand or right-hand trailer tail lamp is faulty.
X
Change the bulb. b AUTO
lights
inopera‐
tive The light sensor is faulty.
X
Visit a qualified specialist workshop. b Rear left
indicator
or
Rear
right
indicator The rear left-hand or right-hand turn signal is faulty.
X
Visit a qualified specialist workshop. b Left mir‐
ror indi‐
cator
or
Right mir‐
ror indi‐
cator The turn signal in the left-hand or right-hand exterior mirror
is faulty. The display message will only appear if all LEDs have
failed.
X
Visit a qualified specialist workshop. b Front
left indi‐
cator
or
Front
right
indicator The front left-hand or right-hand turn signal is faulty.
X
Change the bulb ( Ypage 304). b Third
brake lamp The third brake lamp is faulty. The display message will only
appear if all LEDs have failed.
X
Visit a qualified specialist workshop. Display
messages
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Display messages
Possible causes/consequences and
X
X Solutions b Left-hand
tail lamp/
brake lamp
or
Right-
hand tail
lamp/
brake lamp The left-hand or right-hand tail lamp/brake lamp is faulty. The
display message will only be shown if several LEDs have
failed.
X
Visit a qualified specialist workshop. b Left main
beam
or
Right
main beam The left-hand or right-hand main beam headlamp is faulty.
X
Halogen headlamps: replace the bulb (Ypage 304).
X Bi-xenon headlamp*: visit a qualified specialist workshop.b Intell.
Light Sys‐
tem inop‐
erative
The Intelligent Light System* is faulty. The lights remain avail-
able without the Intelligent Light System*.
X
Visit a qualified specialist workshop. b Left
licence
plate lamp
or
Right
licence
plate lamp The left-hand or right-hand licence plate lamp is faulty.
X
Visit a qualified specialist workshop. b Left fog
lamp
or
Right fog
lamp
The front left-hand or right-hand foglamp* is faulty.
X
Visit a qualified specialist workshop. b Rear left
fog lamp
or
Rear
right fog
lamp The left-hand or right-hand rear foglamp is faulty. The display
message will only be shown if several LEDs have failed.
X
Visit a qualified specialist workshop. 272
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messagesPractical advice
* optional
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