check engine MERCEDES-BENZ A-CLASS HATCHBACK 2018 Owners Manual

Key
Overview of
key functions &
WARNING Risk of accident and inju ry
due tochildren left unat tended in the
ve hicle
If ch ildren are left unat tended in theve hicle,
th ey could:
R open doo rs,th ereby endangering other
persons or road users.
R get out of theve hicle and be hit by
oncoming traf fic.
R ope rate ve hicle equipment and become
trapped, forex ample.
In addition, children could also set theve hi‐
cle in motion, forex ample, by:
R releasing the parking brake.
R shifting the automatic transmission out of
park position jor shifting manual trans‐
mission into idle position.
R starting the engine. #
Never lea vechildren and animals unat‐
te nded in theve hicle. #
When leaving theve hicle, alw aysta ke
th eke y with you and lock theve hicle.
This also applies tothe Digital Vehicle
Ke y if the "Digital Vehicle Key" function
is activated via Mercedes me connect. #
Keep theve hicle key out of reach of
ch ildren. This also applies tothe Digital
Ve hicle Key if the "Digital Vehicle Key"
function is activated via Mercedes me
connect. *
NO
TEDama getotheke y caused by
magnetic fields #
Keep theke yaw ay from strong mag‐
netic fields. 1
Locks
2 Battery check lamp
3 Unloc ks
% The key may vary from the one shown in the
diagram, depending on theve hicle equip‐
ment.
The key loc ksand unlo cksth efo llowing compo‐
nents:
R the doors
R the fuel filler flap
R theta ilgate Opening and closing
65

#
Press and hold theu button.
Setting the departu retime #
Brie fly press swit chu . #
Press the, or. button repeatedly
until the time tobe changed appears in the
displa y. #
Press theu and^ buttons simultane‐
ousl y.
The Îsymbol in there mo tecontrol displ ay
fl ashes. #
Press the, and. buttons toset the
desired departure time. #
Press theu and^ buttons simultane‐
ousl y.
The new departure time is stored.
Up tothre e departure times can be stored. #
Toactivate the departu retime: select the
desired departure time and press and hold
th eu button.
The Ísymbol, the departure time and,
depending on the selected departure time,
th e letter A, BorCappear on the displa y. #
Todeactivate the departure time: select
th e desired departure time and press and
hold the^ button.
OFF appears on the displa y. #
Tocheck thest atus of thest ationary
heater: briefly press theu button.
Switching off immediately #
Press and hold the^ button.
Overview of there mo tecont rol displa ys(sta‐
tiona ryheater/stationary ventilation) 1
Stationary ventilation switched on
2 Stationary heater swit ched on 3
Selected departure time
4 Remaining time forth est ationary heater/
st ationary ventilation (in minu tes)
5 Stationary heater/ stationary ventilation
acti ve
6 Departure time acti vated
7 Signal stre ngth
Fu rther possible displa ys:
R Time: activated departure time.
R Zero minutes: theru nning time forth est a‐
tionary heater is inc reased, as the engine has
not yetre ached operating temp erature when
it is star ted.
R OFF: thest ationary heater/ stationary venti‐
lation is switched off. Clima
tecontrol 147

Driving
Swit
ching the po wer supp lyor ignition on
without starting the engine &
WARNING Risk of accident and inju ry
due tochildren left unat tended in the
ve hicle
If ch ildren are left unat tended in theve hicle,
th ey could:
R open doo rs,th ereby endangering other
persons or road users.
R get out of theve hicle and be hit by
oncoming traf fic.
R ope rate ve hicle equipment and become
trapped, forex ample.
In addition, children could also set theve hi‐
cle in motion, forex ample, by:
R releasing the parking brake.
R shifting the automatic transmission out of
park position jor shifting manual trans‐
mission into idle position. R
starting the engine. #
Never lea vechildren and animals unat‐
te nded in theve hicle. #
When leaving theve hicle, alw aysta ke
th eke y with you and lock theve hicle.
This also applies tothe Digital Vehicle
Ke y if the "Digital Vehicle Key" function
is activated via Mercedes me connect. #
Keep theve hicle key out of reach of
ch ildren. This also applies tothe Digital
Ve hicle Key if the "Digital Vehicle Key"
function is activated via Mercedes me
connect. &
DANG ER Risk of fata l injuries due to
ex haust gases
Combustion engines emit poisonous exhaust
ga ses such as carbon monoxide. Inhaling
th ese exhaust gases is hazardous tohealth
and can lead topoisoning. #
Never lea vethe engine running in an
enclosed space wi thout suf ficient venti‐
lation. &
WARNING Risk offire caused byflam‐
mable material on theex haust sy stem
Flammable materials brought in byeither ani‐
mals or environmen tal influences may ignite
if th ey come into contact wi thhot parts of
th e engine or exhaust sy stem. #
Therefore, check regularly that there
are no flammable materials in the
engine compartment or on theex haust
sy stem. Re
quirements:
R theke y is in theve hicle and is recognised.
R or: a Digi talVe hicle Key is located in the
mar ked space (→ page153).
R the brake pedal is not depressed. Driving and parking
151

Yo
u can swit choff the engine while driving by
pressing button 1for about thre e seconds or
by pressing button 1thre e times within a sec‐
ond. Be sure toobser vethe saf ety no tes under
"Driving tips".
St arting theve hicle with a Digital Vehicle
Key
Re quirements:
R one of thefo llowing versions of the Digital
Ve hicle Key is available:
- suitable mobile phone
- Digital Vehicle Keyst icker
R theve hicle is equipped with the "Digital Vehi‐
cle Key" function.
R the "Digital Vehicle Key" function is activated
via Mercedes me connec t:http://
www.mercedes.me.
R the mobile phone is suf ficiently charge d.
% You can check the suitability of your mobile
phone byentering the phone number at
http://www.mercedes.me. Information about suitable mobile phones
can be obtained from
your Mercedes-Benz
service centre or at http://www.mercedes-
benz.com/connect.
% Mercedes-Benz recommends that you car ry
th e emer gency key in case of function
re strictions.
% The function is only available in combination
with Mercedes me connect and on lyin cer‐
ta in countries.
% Protective cases around the mobile phone
can impair thera nge of functions. Using the Digital
Vehicle Keyfo r the first
time #
Deactivate theke y2 (→page 66). #
Place key2 in mar ked space 3onthe
symbol 4. #
Place the mobile phone or Digital Vehicle Key
st icke r in the mar ked space 1. Driving and parking
15 3

#
Dep ress the brake pedal and start theve hicle
using thest art/ stop button.
Any fur ther starts with th e DigitalVehicle
Key
The key is not needed for any fur ther starts. #
Place the mobile phone or Digital Vehicle Key
st icke r in the mar ked space 1. #
Depress the brake pedal and start theve hicle
using thest art/ stop button.
The "Digital Vehicle Key" service can be deacti‐
va ted in Mercedes me connect at http://
www.mercedes.me. The function is then deacti‐
va ted in the mobile phone via an online connec‐
tion. If connection tothe Internet is not possible,
e.g. af terth e mobile phone or the Digital Vehicle
Ke yst icke r has been stolen, theke y function can
be deacti vated at a Mercedes-Benz service
centre.
St arting theve hicle in emer gency operation
mode
If th eve hicle does not start and thePlace the
key in the marked space See Owner's Manual
message appears in the multifunction displa y,yo
u can start theve hicle in emer gency operation
mode. Ma
rked space (e xample with cup holder without
co ver) #
Open the co ver of mar ked space 2if neces‐
sar y. #
Make sure that mar ked space 2is em pty. #
Remo vekey1 from theke yring. #
Place key1 in mar ked space 2onthe
symbol 3.
The vehicle will start af ter a short time.
If yo ure mo vekey1 from mar ked space 2
th e engine continues running. For fur ther
engine starts ho wever,ke y1 must be loca‐
te d in mar ked space 2on symbol 3during
th e entire journe y. #
Have theke y1 checked at a qualified spe‐
cialist workshop.
If th eve hicle does not star t: #
place key1 in mar ked space 2and lea ve
it th ere. #
Vehicles with manual transmission:
depress the clutch pedal. #
Depress the brake pedal and start theve hicle
using thest art/ stop button.
% You can also swit chon the po wer supp lyor
th e ignition with thest art/ stop button. 15 4
Driving and pa rking

R
you are no lon ger depressing the accelerator
or brake pedal.
% Glide mode can also be activated if you ha ve
selected the "Eco" setting forth e drive in the
drive prog ram =.
Glide mode is deactivated again if one of the
conditions is no longer met.
Ve hicles with Driving Assistance Package,
Ac tive Di stance Assist DISTRO NIC orActive Brake Assi
st:Glide mode is not acti vated if one
of these sy stems is active.
Glide mode can also be pr evented bythefo llow‐
ing parame ters:
R incline
R downhill gradient
R temp erature
R height R
speed
R operating status of the engine
% Glide mode can be ended bypressing the
ri ght-hand steering wheel gearshift paddle
(→ page 166). Problems with th
e transmissionProblem
Possible causes/consequences and M
MSolutions
The transmission has problems shifting
ge ar. The transmission is losing oil. #
Have the transmission checked at a qualified specialist workshop immediatel y.
The acceleration characteristics are
de teriorating.
The transmission no longer shifts gear. The transmission is in emer
gency operation mode. #
Pull over and stop theve hicle, paying attention toroad and traf fic conditions. #
Switch the transmission toposition j. #
Switch off the engine. #
Wait at least ten seconds be fore re starting the engine. #
Switch the transmission toposition h. 16 8
Driving and pa rking

Problem
Possible causes/consequences and M
MSolutions #
Have the transmission checked at a qualified specialist workshop immediatel y. Re
fuelling Re
fuelling theve hicle &
WARNING Risk offire or explosion from
fuel
Fu els are highly flammable. #
Fire, naked flames, smoking and creat‐
ing spar ksmust be avoided. #
Swit choff the ignition and, if it has
been in use, switch off thest ationary
heater before youre fuel your vehicle. &
WARNING Risk of inju ryfrom fuels
Fu els are poisonous and hazardous to your
health. #
Do not swallow fuel or let it come into
contact with skin, eyes or clo thing. #
Do not inhale fuel vapour. #
Keep children away from fuel. #
Keep doors and windo wsclosed du ring
th ere fuelling process.
If yo u or other people come into contact with
fuel, obser vethefo llowing: #
Immediately rinse fuel off your skin with
soap and water. #
If fuel comes into contact with your
ey es, immediately rinse them thor‐
oughly with clean water.Seek medical
attention immediately. #
Ifyo u swallow fuel, seek medical atten‐
tion immediatel y.Do not induce vomit‐
ing. #
Change immediately out of clo thing that
has come into con tact wi thfuel. &
WARNING Risk offire or explosion from
elect rostatic charge
Electros tatic charge can crea tespar ksand
th ereby ignite fuel vapours. #
Before you open the fuel filler cap or
ta ke hold of the pump nozzle, touch the
me tallic vehicle body.
This dischar ges any electros tatic charge
th at may ha vebuilt up. #
Do not get into theve hicle again during
th ere fuelling process.
Otherwise, electros tatic charge could
build up again. &
WARNING Risk offire from fuel mixture
Ve hicles with a diesel engine:
If yo u mix diesel fuel with petrol, theflash
point of the fuel mixture is lo werth an that of
pure diesel fuel. Driving and parking
16 9

#
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

fi
ed based on the actual operating conditions
and/or loads.
Examples of arduous operating conditions:
R regular city driving with frequent intermedi‐
ate stops
R mainly short-dis tance driving
R frequent operation in mountainous terrain or
on poor road sur faces
R when the engine is of ten le ftidling for long
periods
R operation in particula rly dusty conditions
and/or if air-recirculation mode is frequently
used
In these or similar operating conditions, ha vethe
interior air filter, engine air cleaner, engine oil
and oil filter etc. changed more frequent ly. The
ty re s must be checked more frequently if the
ve hicle is operated under increased loads. Fur‐
th er information can be obtained at a qualified
specialist workshop. Battery disconnection periods
The ASS
YST PLUS se rvice inter val display
can only calculate the service due da tewhen
th e bat tery is connected. #
Notedown the service due date displa yed on
th e instrument display before disconnecting
th e battery (→ page419). Engine com
partment Ac
tive bonn et(pedestrian pr otection) Operation of
the active bonnet (pedestrian
pr otection)
In cer tain accident situations, therisk of injury
to pedestrians can be reduced bythe actuation
of the active bonn et. The rear area of the engine
bonn etisraised byappr oximately 70 mm.
Fo rth e drive tothewo rkshop, reset the trig‐
ge red active bonn etyourself. Af terth e active
bonn ethas been triggered, pedestrian pr otection
may be limited.
A qu alified specialist workshop must re-ins tate
th e full functionality of the active bonn et. The active bonnet is not
available in all coun‐
tries.
Re setting the active bonnet &
WARNING Danger of bu rns from hot
component parts in the engine compart‐
ment
Cer tain component parts in the engine com‐
partment may be very hot, e.g. the engine,
th era diator and parts of theex haust sy stem. #
Let the engine cool down and only
to uch the component parts described
below: 420
Maintenance and care

#
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