Display messages
Possible causes/consequences and M
MSolutions
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ð
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¸ Currently unavailable
Radar sensors dirty *T
heradar sensor sy stem is malfunctioning. Possible causes:
R dirt on the sensors
R heavy rain or snow
R extended country driving wi thout other traf fic, e.g. in the desert
Driving sy stems and driving saf ety sy stems may be malfunctioning or temp orarily una vailable.
Once the cause of the problem is no longer present, the driving sy stems and driving saf ety sy stems will be available
again.
If th e display message does not disappear: #
Stop theve hicle in accordance with the tra ffic conditions. #
Clean all sensors (/ page 509). #
Restart the engine. Display messages and
warning/indicator lamps 599
Display messages
Possible causes/consequences and M
MSolutions
? Coolant Stop vehicle
Switch engine off *T
he coolant is too hot. #
Stop theve hicle immediately in accordance with the traf fic conditions and switch off the engine. &
WARNING Danger of bu rns when opening the bonn et
If yo u open the engine bonn etwhen the engine has overheated or during a fire inthe engine compartment, you
could come into contact wi thhot gases or other escaping operating fluids. #
Before opening the bonn et, allow the engine tocool down. #
Intheeve nt of a fire inthe engine compartment, keep the engine bonn etclosed and call thefire service. #
Wait until the engine has cooled down. #
Make sure that the air supply tothera diator is not impaired. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that
th e coolant temp erature display remains below 120 °C.
? *T
hefan mo tor is defective. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that
th e coolant temp erature display remains below 120 °C.
To switch off the engine,
press the Start/Stop but-
ton for at least 3 seconds
or 3 times. *Y
ou ha vepressed thest art/ stop button while driving. #
Toswitch off the engine while driving, see (/ page180). Displ
aymessa ges and warning/indicator lamps 605
Display messages
Possible causes/consequences and M
MSolutions #
Consult a qualified specialist workshop. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Switch off the engine. #
Consult a qualified specialist workshop.
# Stop vehicle Leave engine
running *T
he battery charge leve l is too lo w. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Lea vethe engine running. #
Wait until the display message disappears before pulling away. #
Ifth e display message does not disappear: consult aqualified specialist workshop.
# 48 V battery See Owner's
Manual *T
he 48 V on-board electrical sy stem has function restrictions. Co nvenience functions may be restricted. #
Consult a qualified specialist workshop immediatel y.
Cannot start engine See
Owner's Manual *T
hecharge leve l of the 48 V battery is too lo w.You can no lon gerst art the engine. #
Switch off electrical consumers that are not required. Display messages and
warning/indicator lamps 607
Display messages
Possible causes/consequences and M
MSolutions
h Rectify tyre pressure *T
he tyre pressure is too low in at least one of the tyres, or the dif fere nce in tyre pressure between the individual
wheels is too great. #
Check the tyre pressure and add air, if necessar y. #
When the tyre pressure is cor rect, restart the tyre pressure monitor (/ page 538).
h
Warning tyre defect *T
he tyre pressure in one or more tyres has dropped suddenly. The wheel position is displa yed. &
WARNING Risk of an accident from driving wi thaflat tyre
Flat tyres are dangerous in thefo llowing ways:
R The tyres can overheat and cause a fire.
R ‑ The driving characteristics, steering and braking may be greatly impaired.
Yo u could then lose control of theve hicle. #
Do not drive with a flat tyre. #
Obse rveth e no tes on flat tyres. No
tes on flat tyres (/ page515). #
Stop theve hicle in accordance with the tra ffic conditions. #
Check the tyres.
Tyre(s) overheated *A
t least one tyre is overheating. The af fected tyres are displ ayed in red. At temp eratures close tothe limit value,
th e tyres are displa yed in yello w. 620
Display messages and warning/indicator lamps
Anti-skid
chains
see Snow chains
Anti-theft ala rmsystem
see ATA (anti-theft alarm sy stem)
Anti-theft pr otection
Ad ditional door lock .............................. 82
Immobiliser .........................................1 04
Anti-theft pr otection
see ATA (anti-theft alarm sy stem)
Anticipatory occupant pr otection
see PRE- SAFE®
(anticipatory occu‐
pant pr otection)
see PRE-SAFE ®
PLUS (anticipatory
occupant pr otection plus)
Apple CarPlay ®
........................................4 50
Connecting an iPhone ®
....................... 451
Control using the application buttons
.............................................................4 51
Ending ................................................ .451
No tes ................................................... 451
Overview ............................................. 450
Sound settings .....................................4 51
Tr ans ferred vehicle data ......................4 54Asht
ray
Fr ont centre console ........................... 14 0
Assistance Menu (on-board co mputer) .................. 310
Assistance sy stems
see Driving saf ety sy stem
ASS YST PLUS ........................................... 495
Battery disconnection pe riods .............4 96
Displ aying the service due date ........... 495
Fu nction/no tes ................................... 495
Re gular maintenance work .................. 495
Special service requirements .............. 495
ATA (anti-theft ala rmsystem) ................ .104
Deactivating the alarm ........................ 105
Fu nction .............................................. 104
Fu nction of interior pr otection .............1 06
Priming/deactivating interior pr otec‐
tion ...................................................... 107
Priming/deactivating tow- aw ay pro‐
te ction ................................................. 106
To w- aw ay protection function .............. 105
AT TENTION ASSI ST......................... 285, 286
Fu nction .............................................. 285
Setting ................................................. 286 Sy
stem limitations ...............................2 85
At tention assistant
see ATTENTION ASSIST
Au thorised workshop
see Qualified specialist workshop
Au tomatic car wash mode
Ac tivating ............................................ 504
Au tomatic distance control
see Active Dis tance Assi stDISTRONIC
Au tomatic driving lights .........................147
Au tomatic engine start (ECO start/
sto p function) .......................................... 189
Au tomatic engine stop (ECO start/
sto p function) .......................................... 189
Au tomatic front passen ger front air‐
bag deacti vation sy stem
see Automatic front passenger front
airbag shutoff
Au tomatic front passen ger front air‐
bag shu toff ........................................... 46, 47
Fu nction of the automatic front
passenger front airbag deactivation
sy stem ................................................... 46 Index
651
Ac
tive Brake Assi stFunctions cur‐
re ntly limited See Owner's Manual ...... 589
Ac tive Brake Assi stFunctions limited
See Owner's Manual ........................... 590
Ac tive Dis tance Assi stavailable
again .................................................. .602
Ac tive Dis tance Assi stcur rently
una vailable See Owner's Manual .........601
Ac tive Dis tance Assi stinope rative ....... 601
Ac tive Lane Keeping Assist cur rently
una vailable See Owner's Manual .........596
Ac tive Lane Keeping Assist inopera‐
tive ...................................................... 596
bAc tive Light Sy stem inoperative .. 631
Ac tive Parking Assist and
PA RKTRONIC inoperati veSee Own‐
er's Manual ......................................... 592
Ac tive Steering Assist cur rently
una vailable due tomultiple emer‐
ge ncy stops ......................................... 595 Ac
tive Steering Assist cur rently
una vailable See Owner's Manual .........594
Ac tive Steering Assist inoperative .......595
Ac tive Stop-and-Go Assist cur rently
una vailable see Owner's Manual .........596
Ac tive Stop-and-Go Assist inopera‐
tive See Owner's Manual ..................... 596
Ad aptive Highbeam Assist cur rently
una vailable See Owner's Manual .........632
Ad aptive Highbeam Assist inopera‐
tive ...................................................... 632
Ad aptive Highbeam Assist Plus cur‐
re ntly una vailable See Owner's Man‐
ual ...................................................... .632
Ad aptive Highbeam Assist Plus inop‐
erative ................................................ .632
¯ AdBlue sy stem fault Emer. op.:
max. XXX km/h Start not poss. in
XXX km ................................................ 61 4¯
AdBlue sy stem fault Emer gency
op. in XXX miles See Owner's Man‐
ual ........................................................ 61 4
¯ AdBlue sy stem fault Engine
st art not possible ................................ .615
¯ AdBlue sy stem fault See Own‐
er's Manual .......................................... 61 4
5 Add 1 litre engine oil when next
re fuelling .............................................. 61 0
Anti-theft alarm sy stem Malfunction ... 628
Apply brake todeselect Park (P)
position ................................................ 61 6
App lybrake toselect R ........................ 61 5
é ATTENTION ASSIST inoperative ... 591
éAT TENTION ASSIS T:Take a
break! .................................................. 591
bAu tomatic driving lights inoper‐
ative .................................................... 630
Au xilia rybattery malfunction ...............617
Beginning eme rgency stop .................. 595 658
Index
Blind Spot Assi
stcur rently una vaila‐
ble See Owner's Manual ...................... 596
Blind Spot Assist inope rative ............... 597
Blind Spot Assi stnot available when
to wing a trailer See Owner's Manual ...5 97
Cann otstart engine See Owner's
Manual ................................................ 607
ÁChan gekey bat teries .................. 622
JCheck brake fluid le vel................ 585
Check brake pads See Owner's Man‐
ual ...................................................... .586
ïChe cktrailer hitch lo ck(white
display message) .................................6 25
hChe cktyre(s) ............................... 61 9
! Clean the fuel filter .................... .609
ÁCo mpressor is cooling ................. 594
?Coolant Stop vehicle Switch
engine off ............................................ 605
Cruise contro l and Limiter inope ra‐
tive ...................................................... 603 Cruise control inope
rative ................... 603
Cruise control off ................................ 603
_Cur rently una vailable Camera
view restricted ..................................... 600
çCu rrently unavailable Radar
sensors dirty .......................................5 99
!cur rently una vailable See Own‐
er's Manual .......................................... 578
÷ currently una vailable See Own‐
er's Manual ........................................ .579
Drive sy stem Malfunction Stop
Switch engine off ................................ 609
Drive sy stem Malfunction Visit work‐
shop ....................................................6 09
5Engine oil le vel cannot be
measured ............................................ .612
5 Engine oil le velRe duce oil le vel.... 611
5 Engine oil le velSt op vehicle
Switch engine off ................................. 61 05
Engine oil pressu reStop Switch
off engine ............................................. 611
ä Fault Drive at max. 80 km/h .......593
6Fr ont left malfunction Consult
wo rkshop (e xample)............................ 587
Fr ont-passenger airbag disabled See
Owner's Manual ..................................5 88
Fr ont-passenger airbag enabled See
Owner's Manual ..................................5 88
Hazard warning lamps malfunction‐
ing ...................................................... .632
&inoperative Battery low ...............629
&inoperative Refuel vehicle ........... 629
&inoperative See Owner's Man. ....629
!inoperative See Owner's Man‐
ual ....................................................... 579
÷ inope rative See Owner's Man‐
ual ....................................................... 580
Tinoperati veSee Owner's Man‐
ual ....................................................... 581 Index
659
Speed Limit Assi
stcur rently una vail‐
able See Owner's Manual .................... 598
Speed Limit Assist inope rative ........... .598
ÙSt eering malfunction Incre ased
ph ysical ef fort See Owner's Manual .... 626
ÙSt eering malfunction Stop
immediately See Owner's Manual .......627
St op vehicle Lea veengine running
Wa itTransmission cooling ....................617
# Stop vehicle Lea veengine run‐
ning ..................................................... 607
#St opvehicle See Owner's Man‐
ual .......................................................6 06
çsuspended ................................... 601
bSwitch off lights .......................... 631
bSwitch on headla mps.................. 631
To shift out of P or N,depress brake
and start engine .................................. .615 To
switch off the engine, press the
St art/ Stop button for at least 3 sec‐
onds or 3 times. .................................. 605
ØTo p upAdBlue Emergency op.
in XXX miles See Owner's Manual .......61 3
+ Top up coolant See Owner ’s
Manual ................................................ 604
¥To p upwasher fluid .................... .628
Tr af fic Sign Assi stcur rently una vaila‐
ble See Owner's Manual ...................... 598
Tr af fic Sign Assi stinope rative ............. 598
ïTr ailer coupling extending… ......... 624
Tr ansmission Malfunction Stop ............ 617
! Turn on the ignition torelease
th e parking brake ................................ 582
Ty re press. monitor cur rently una vail‐
able ...................................................... 61 8
Ty re press. monitor inoperative ............61 8
Ty re press. monitor inoperative No
wheel sensors ...................................... 61 8Ty
re(s) ove rheated ...............................6 20
Up date failed ...................................... .624
Up date failed Software remains
unchanged ........................................... 624
Up date successfully comple ted ...........6 23
dVe hicle is operational Switch
off ignition before exiting .................... .624
Á Vehicle rising Please wait............ 592
ÁVe hiclerising ...............................5 92
hWa rning tyre defect .....................620
hWheel sensor(s) missing ..............61 9
Wi thout changing gear, consult work‐
shop ..................................................... 61 6
Ø XX,X l Top up AdBlue Switch on
ignition, wait 60 sec. or eng. start
not poss. .............................................. 61 3
Display on the windscreen
see Head-up display
Distance control see Active Dis tance Assi stDISTRONIC Index
661