2018 MERCEDES-BENZ A-CLASS HATCHBACK check engine light

#
Turn brightness control 1up or down.
The lighting of the instrument display and in
th e control elements of theve hicle interior is
adjus ted. Menus and submenus
Fu
nctions on the service menu of the on-
board compu terOn-board computer:
, Service #
Toselect the function: swipe upwards or
down wards on the left-hand Touch Control. #
Press the left-hand Touch Control.
Fu nctions on theService menu:
R Message memory (→ page 498)
R AdBlue :Ad blue ®
ra nge and fill le vel
R Tyres:
- Restart the tyre pressure loss warning
sy stem (→ page 467) -
Check the tyre pressure with the tyre
pressure monitoring sy stem
(→ page 461)
- Restart the tyre pressure monitoring sys‐
te m (→ page 462)
R ASSYST PLUS : calls upthe service due date
(→ page 419)
R Coolant: coolant temp erature display
R Engine oil level: engine oil le vel
R Consumption info: fuel life cycle consump‐
tion Calling up
the assistant display On-board computer:
, Assistance
The following displa ysare available on the assis‐
ta nt displ aymenu:
R Assis tant displ ay
R Attention le vel (→ page 231)
R Full-sur face menu displ ay #
Toswitch between the displa ys:swipe
upwards or down wards on the left-hand
To uch Control. St
atus displa yson the assis tant displ ay:
R é ATTENTION ASSIS T:deactivated
R ¸ Grey radar waves next tovehicle: Blind
Spot Assist or Active Blind Spot Assi stena‐
bled
R ¸ Green radar waves next tovehicle:
Blind Spot Assist or Active Blind Spot Assi st
active
R DISTRO NICActive Dis tance Assi stdispla ys
( → page 200) 254
Instrument Display and on-board computer

#
Push yellow handle 1onthe bonn etcatch
to the left as far as it will go (palm down‐
wa rds). Lift the bonn etuntil it is automati‐
cally raised bythe pneumatic stru t. #
Toclose: lowe rth e bonn etand let it fall from
a height of appr oximately 20 cm. #
Ifth e bonn etcan still be lif ted slightl y,open
th e bonn etagain and close it with a little
fo rc e until it engages cor rectl y. Engine oil
Checking
the engine oil le vel using the on-
board compu ter
Re quirements:
The engine oil le vel is de term ined during driving.
De term ining the engine oil le vel can take up to
30 minutes with a normal driving style and even
longer with an active driving style.
In order torecei veare sult as quickly as possi‐
ble:
R warm upthe engine
R park theve hicle on a le vel sur face
R leave the engine running at idling speed
On-board compu ter:
, Assistance .
Engine oil level
Yo u will see one of thefo llowing messages on
th e multifunction display:
R Engine oil level Measuring now : measure‐
ment of the oil le vel is not yet possible. #
Repeat there qu est af ter a maximum of
30 minutes driving. R
Engine oil level OK andthe bar display for
indicating the oil le vel on the multifunction
display is green and is between "min" and
"max": the oil le vel is cor rect.
R Engine oil level Add 1,0 l andthe bar display
fo r indicating the oil le vel on the multifunc‐
tion display is orange and is below "min": #
Top up with 1 l engine oil.
R Reduce engine oil level andthe bar display
fo r indicating the oil le vel on the multifunc‐
tion display is orange and is abo ve"max": #
Drain off excess engine oil that has been
added. Consult a qualified specialist work‐
shop.
R For engine oil level turn on ignition: #
switch on the ignition tocheck the engine oil
le ve l.
R Engine oil level System inoperative : sensor
fa ulty or not inser ted. #
Consult a qualified specialist workshop.
R Engine oil level System currently unavail. : Maintenance and care
423

&
WARNING Risk ofexplosion from a fro‐
zen battery
A dischar ged battery may freeze at temp era‐
tures slightly abo veor below freezing point.
During starting assis tance or battery charg‐
ing, bat tery gas may be released. #
Alw aysth aw a frozen bat tery out first
before charging it or per form ing start‐
ing assis tance. If
th e indicator/warning lamps in the instrument
clus ter do not light up at low temp eratures, it is
ve ry likely that the dischar ged battery has fro‐
zen. In this case you may neither jump-s tart the
ve hicle nor charge the batter y.
The service life of a battery that has been
th awe d may be dramatically shor tened. The
st arting characteristics may be impaired, espe‐
cially at low temp eratures.
It is recommended that you ha veathaw ed bat‐
te ry checked at a qualified specialist workshop. *
NO
TEDama gecaused bynumerous or
ex tended attem ptsto start the engine Nume
rous or extended attem ptsto start the
engine may damage the catalytic con verter
due tonon-combu sted fuel. #
Avoid numerous and extended attem pts
to start the engine. Obser
vethefo llowing points during starting
assis tance and when charging the battery:
R Only use undamaged jump lead/charging
cables with a suf ficient cross-section and
insula tedte rm inal clamps.
R Non- insulated parts of thete rm inal clamps
must not come into con tact wi thother me tal
parts while the jump lead/charging cable is
connected tothe battery/jump-s tart connec‐
tion point.
R The jump lead/charging cable must not
come into contact wi thany parts which may
mo vewhen the engine is running.
R Alw ays make sure that nei ther you nor the
battery is elect rostatically charge d. R
Keep away from fire and naked flames.
R Do not lean overth e batter y.
Obser vethe additional following points when
ch arging the battery:
R Only use battery charge rs tested and
appr oved for Mercedes-Benz.
R Read the battery charge r's operating instruc‐
tions before charging the batter y.
Obser vethe additional following points during
st arting assis tance:
R Starting assis tance may only be pr ovided
using batteries with a nominal voltage of 12
V.
R The vehicles must not touch.
R Petrol engine: only acceptstarting assis‐
ta nce if the engine and exhaust sy stem are
cold. Breakdown assis
tance 447

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

JBrake sy
stem warning lamp
(red) .................................................... 549
J Brake sy stem warning lamp
(yellow) ................................................ 551
?Coolant warning lamp ................ .558
#Electrical fault warning lamp ...... .557
; Engine diagnosis warning lamp .. .557
å ESP®
OFF warning lamp .............. 553
÷ESP ®
wa rning lamp flashes ........ .552
÷ESP ®
wa rning lamp lights up ...... .552
æFu elreser vewarning lamp .......... 557
ÐPo werst eering sy stem warning
lamp .................................................... 555
!Re d indicator lamp, elect ric
parking brake applied .......................... 551
6Re stra int sy stem warning lamp .. .553
7Seat belt warning lamp flashes .. .554
7 Seat belt warning lamp lights
up ........................................................ 554
ïTr ailertow hit chwarning lamp .... 556 hTy
repressure monitoring sys‐
te m wa rning lamp flashes .................. .560
hTy repressure monitoring sys‐
te m wa rning lamp lights up ................ .559
LWa rning lamp for dis tance
wa rning function ................................ .555
!Ye llow elect ric pa rking brake
indicator lamp is malfunctioning .......... 551
Wa rning/indicator lamps .......................548
Overview ............................................. 548
PA SSENGER AIR BAG ............................ .41
Wa rranty ....................................................26
Wa sher fluid
see Windsc reen washer fluid
Wa shing byhand (care) .......................... 428
Wa ter tank
see Air-water duct
We ather information ............................... 363
We b br owser
Calling up a web page .........................3 99
Calling up options ............................... 402 Calling up
the settings .........................4 02
Deleting a bookma rk........................... 402
Deleting Internet his tory ...................... 402
Ending ................................................. 402
Managing bookmar ks.......................... 402
Overview .............................................. 401
We bsite
Calling up ............................................ 399
Wheel change
Fitting a new wheel .............................. 475
Lo we ring theve hicle ............................4 76
Preparation .......................................... 472
Ra ising theve hicle ...............................4 73
Re moving a wheel ................................ 475
Re moving/fitting hub caps .................. 473
Wheel change
see Emergency spa rewheel
Wheel rotation ........................................ .471
Wheels Care .................................................... 432
Changing hub caps .............................. 473
Checking ............................................ .458
Che cking the tyre pressure (tyre
pressure monitoring sy stem) ............... 461 600
Index