2018 MERCEDES-BENZ A-CLASS HATCHBACK engine coolant

Engine
Display messages
Possible causes/consequences and M
MSolutions
! Clean the fuel filter *
Ve hicles with diesel engines: the fuel filter is dirty or thewate r inthe fuel filter must be drained off. #
Consult a qualified specialist workshop.
5 Engine oil level cannot be
measured *T
he electrical connection tothe oil le vel sensor has been inter rupte d or the oil le vel sensor is faulty. #
Consult a qualified specialist workshop.
? Coolant Stop vehicle
Switch engine off *T
he coolant is too hot. #
Stop theve hicle immediately, paying attention toroad and 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. 520
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions #
Wait until the engine has cooled down. #
Make sure that the air supply tothera diator is not obstructed. #
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.
¸
Replace air cleaner *
Ve hicles with diesel engines: the engine air filter is dirty and must be replaced. #
Consult a qualified specialist workshop.
# Stop vehicle See Owner's
Manual *T
he battery is no longer being charge d and the battery charge leve l is too lo w.
* NO
TEPossible engine damage if you continue driving #
Do not continue driving under any circum stances. #
Consult a qualified specialist workshop. #
Pull over and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions. Do not
continue driving under any circums tances. #
Switch off the engine. #
Consult a qualified specialist workshop. Display messages and
warning/indicator lamps 521

Display messages
Possible causes/consequences and M
MSolutions
# See Owner's Manual *T
he battery is not being charge d.
* NO
TEPossible engine damage if you continue driving #
Do not continue driving under any circum stances. #
Consult a qualified specialist workshop. #
Stop theve hicle immediately, paying attention toroad and traf fic conditions, and switch off the engine. #
Consult a qualified specialist workshop.
Top up coolant See Own-
er’s Manual *T
he coolant le vel is too lo w.
* NO
TEEngine dama gedue toinsuf ficient coolant #
Avoid long journe yswith insuf ficient coolant. #
Add coolant (→ page 425).
? *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.
# *T
he battery charge leve l is too lo w. #
Pull over and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions. Do not
continue driving under any circums tances. 522
Display messa ges and warning/indicator lamps

Wa
rning and indicator lamps Overview of
warning and indicator lamps Some sy
stems will per form a self-test when the
ignition is switched on. Some warning and indi‐
cator lamps may brief lylight up or flash. This
behaviour is non-critical. These warning and indi‐
cator lamps indicate a malfunction only if they
light up or flash af terth e engine has been star‐
te d or during a journe y.
Instrument display (standard) Instrument display in
the widescreen cockpit Depending on
the display setting, the positions
of the indicator lamps on the instrument display
may dif fer from theex ample shown.
Wa rning and indicator lamps:
L Low beam(→
page122)
T St
anding lights (→ page122)
K High beam(→
page124)
#! Tu
rn signal lights(→ page124)
R Re
ar fog light(→ page122)
6 Re
stra int sy stem(→ page549)
ü Seat belt not
fastened(→ page 554) J
Brakes (yellow)(
→page 549)
J Brakes (red)(
→page 549)
! Electric pa
rking brake (yellow)
(→ page 549)
! Electric pa
rking brake (red)
(→ page 549)
! ABS malfunctioning(→
page 549)
÷ ESP®
(→ page 549)
å ESP®
OFF( →page 549)
L Distance warning(→ page 555)
Ð Po
we r-assis tedsteering malfunction‐
ing( →page 555)
; Engine diagnosis (→
page 557)
% Preglow
# Elect
rical fault (→ page 557)
æ Fu
elreser vewith fuel filler flap loca‐
tion indicator (→ page 557)
? Ve
hicles with widescreen cock pit:
coolant too hot/cold (→ page 557)
h Ty
re pressure monitoring sy stem
(→ page 559) 548
Displaymessa ges and warning/indicator lamps

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
? Coolant warning lamp The
red coolant warning lamp is lit while the engine is running.
Po ssible causes:
R The temp erature sensor is malfunctioning
R The coolant le vel is too low
R The air supply tothera diator is obstructed
R The radiator fan is faulty
If th ere is an additional warning tone, the coolant temp erature has exceeded 120 °C. &
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. #
Stop theve hicle immediately, paying attention toroad and traf fic conditions, and switch off the engine. Do not con‐
tinue driving under any circums tances. #
Obser vethe messages on the multifunction displa y.
If th e coolant temp erature display is at the lo wer end of thete mp erature scale: #
Consult a qualified specialist workshop. 558
Display messages and warning/indicator lamps

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
or #
Exit theve hicle and keep a safe dis tance from it until the engine has cooled down. #
Check the coolant le vel (→ page 425). #
Make sure that the air supply tothera diator is not obstructed. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that the
coolant temp erature display remains below 120 °C. Ty
res Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
h Ty re pressure monitoring
sy stem warning lamp lights
up The
yellow tyre pressure monitoring sy stem warning lamp (pressure loss/malfunction) is lit.
The tyre pressure monitoring sy stem has de tected tyre pressure loss in at least one of the tyres. &
WARNING Risk of an accident due toinsuf ficient tyre pressure
Ty res with insuf ficient tyre pressure pose thefo llowing risks:
R The tyres may bur st, especially as the load and vehicle speed increase.
R The tyres may wearexc essively and/or une venly, which may greatly impair tyre traction.
R ‑ The driving characteristics, steering and braking may be greatly impaired.
Yo u could then lose control of theve hicle. Display messages and
warning/indicator lamps 559

Ac
tivating/deactivating the synchro‐
nisation function (multimedia sys‐
te m) ..................................................... 14 4
Air di stribution settings .......................1 43
Air-recirculation mode ......................... 14 4
Au tomatic control ................................ 14 3
Defrosting the windscreen ...................1 41
Demi sting windo ws............................. 14 4
Fr ont air vents ..................................... 14 9
No te ..................................................... 141
Re ar air vents ...................................... 15 0
Re sidual heat ....................................... 14 4
Sets the air flow .................................... 141
Setting (multimedia sy stem) ................1 43
Setting the air distribution ...................1 41
Setting thete mp erature ....................... 141
St ationary heater/ ventilation .............. 14 4
Switching on/off ................................. 14 2
Switching there ar wind owheater
on/off .................................................. 141
THERMATIC contro l panel .................... 141
THERMOTRONIC contro l panel ............141
Ve ntilating theve hicle (con venience
opening) ................................................ 77
Coat hook on the tailgate ...................... .109 Cock
pit......................................................... 6
Overview ................................................. 6
Co ffee cup symbol
see ATTENTION ASSIST
Combination switch ................................124
Compass .................................................. 362
Compu ter
see On-board computer
Connection status
Displ aying ............................................ 399
Overview ............................................ .399
Connectivity Switching transmission of theve hicle
position on/off .................................... 313
Contacts .................................................. .374
Calling up ............................................ 375
Del eting .............................................. .377
Del eting favo urites .............................. 377
Downloading (from mobile phone) ....... 375
Importing ............................................. 376
Importing (o verview) ............................ 376
Information ..........................................3 74
Making a call ....................................... 376Na
me form at ...................................... .375
Options ................................................ 376
Saving as a favo urite .......................... .377
Selecting options for suggestions ........ 377
St oring .................................................3 76
Con venience closing ................................. 78
Con venience opening ................................ 77
Coolant (engine) Check le vel .......................................... 425
No tes .................................................. 492
Cooling see Climate control
Co pyright ...................................................29
Cornering light ........................................ .126
Cross Traf fic Alert .................................. .231
Crosswind Assist Function/no tes ................................... 189
Cruise control .......................................... 19 6
Ac tivating ............................................ 19 8
Buttons ................................................ 19 8
Calling up a speed .............................. .198
Deactivating ........................................ 19 8
Fu nction .............................................. 19 6568
Index

Ad
aptive Highbeam Assist cur rently
una vailable See Owner's Manual .........547
Ad aptive Highbeam Assist inopera‐
tive ...................................................... 547
Ad aptive Highbeam Assist Plus cur‐
re ntly una vailable See Owner's Man‐
ual ...................................................... .547
Ad aptive Highbeam Assist Plus inop‐
erative ................................................ .547
¯ AdBlue sy stem fault Engine
st art not possible ................................ 527
¯Ad Blue system fault Perf.
re duced in XXX miles See Owner's
Manual ................................................ 527
¯ AdBlue sy stem fault See Own‐
er's Manual ........................................ .527
4 Add 1 litre engine oil when next
re fuelling ............................................. 525
Anti-theft ala rmsystem Malfunction ...545 App
lybrake todeselect Park (P)
position ...............................................5 38
Apply brake toselect R ........................ 537
ÀAT TENTION ASSIST inoperative ...51 5
À ATTENTION ASSIS T:Take a
break! .................................................. 514
b Automatic driving lights inoper‐
ative .................................................... 547
Au xilia rybattery malfunction .............. 535
_Before starting the engine, turn
th esteering wheel. .............................. 542
Blind Spot Assi stcur rently una vaila‐
ble See Owner's Manual ......................512
Blind Spot Assi stinope rative ............... 513
Blind Spot Assi stnot available when
to wing a trailer See Owner's Manual ...5 15
Brake immediately ............................... 499
ÂChange key bat teries .................. 534
JCheck brake fluid le vel................ 504 ïCheck trailer hitch lock (white
display message) ................................ .539
hChe cktyre(s) ............................... 529
!Clean the fuel filter .................... .520
Clutch overheated Avoid pulling away
fo r XX:XX mins ................................... .536
?Coolant Stop vehicle Switch
engine off ............................................ 520
Cruise contro l and Limiter inope ra‐
tive ....................................................... 519
Cruise cont rol inope rative .................... 519
Cruise cont rol off ................................ .518
Cur rently una vailable Camera view
re stricted ............................................. 517
Cur rently una vailable Radar sensors
dirty .....................................................5 16
! currently una vailable See Own‐
er's Manual ........................................ .505
÷cur rently una vailable See Own‐
er's Manual ........................................ .499 Index
571