2021 MERCEDES-BENZ CLA COUPE check engine light

R
Frequent operation in mountainous terrain or
on poor road sur faces
R When the engine is oTen leT idling for long
periods
R Operation in particular lydusty conditions
and/or if air-recirculation mode is frequently
used
In these or similar operating conditions, ha vethe
interior air /lter, air /lter, engine oil and oil /lter,
fo rex ample, changed more frequentl y.The tyres
must be checked more frequently if theve hicle is
operated under increased loads. Further informa-
tion can be obtained at a quali/ed specialist work-
shop. Batt Batt
er
ery disconnection per
y disconnection per iods
iodsThe AS
SYST PLUS service inter val display can cal-
culate the service due date only when the battery
is connected. #
Display and no tedown the service due date
on the inst rument display before disconnect-
ing the battery (/ page 327). Engine com
Engine com
par
partment
tment A
A
ctiv
ctiv e bonne
e bonne t (pedes
t (pedestr trian pr ot
ian pr otection)
ection) Oper
Oper
ation of t
ation of t he activ
he active bonne
e bonne t (pedes
t (pedestr trian pr ot
ian pr otec-
ec-
tion)
tion)
In cer tain accident situations, the actuation of the
active bonnet reduces therisk of injury topedes-
trians. The rear area of the bonnet is raised by
appr oximately 70 mm.
Fo rth e drive tothewo rkshop, reset the actuated
active bonnet yourself (/ page 328).
ATer the active bonnet has been actuated, pedes-
trian pr otection may be limited.
Ha ve the full functionality of the active bonnet
re stored in a quali/ed specialist workshop.
R
R ese ese tting t
tting t he activ
he activ e bonnet
e bonnet &
W
WARNING
ARNING Risk of burns from hot compo-
nent parts in the engine compartment
Cer tain component parts in the engine com-
partment can be very hot, e.g. the engine, the
cooler and parts of theex haust system. #
Allow the engine tocool down and only
to uch component parts described in the
fo llowing. #
With your hand 0at, push down active bonnet
1 inthe area around the hinges on bo th
sides (ar rows ).
In doing so, the actuator is depressurised and
yo u may hear a hissing sound.
The engine bonnet must engage in position. #
Ifth e active bonnet can be raised slightly at
th ere ar in the area of the hinges, repeat the
step until it engages co rrectl y. 328
328
Maintenance and care

#
Ifth e bonnet can still be liTed slightl y,open
th e bonnet again and close it with a little force
until it engages cor rectl y. Engine oil
Engine oil
Chec
Chec
king t
king t he engine oil lev
he engine oil lev el using t
el using the on-board
he on-board
com
com put
puter
er
R
R eq
eq uir
uir ements:
ements:
R The engine has been warmed up.
R The vehicle is par ked on a le vel sur face.
R The engine is running at idle speed.
R The bonnet is closed.
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. On-board computer:
4 Service 5
Engine oil level
One of thefo llowing message s will appear onthe
inst rument displa y:
R Engine oil level Measuring now: measu rement
of the oil le vel is not yet possible. #
Repeat there qu est aTer a maximum of
30 minutes' driving.
R Engine oil level OK andthe bar display for
indicating the oil le vel on the inst rument dis-
play is green and is between "min" and "max":
th e 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 inst rument
display is orange and is below "min": #
Add 1 l of engine oil.
R Reduce engine oil level andthe bar display for
indicating the oil le vel on the inst rument dis-
play is orange and is abo ve"max": #
Drain o. any excess engine oil that has been
added. Todo so, consult a quali/ed specialist
wo rkshop.
R For engine oil level turn on ignition #
Switch on theve hicle tocheck the engine oil
le ve l.
R Engine oil level System inoperative: The oil
leve l sensor is defective or not connected. #
Consult a quali/ed specialist workshop.
R Engine oil level System currently unavail. #
Close the bonnet.
T T opping up engine oil
opping up engine oil &
W
WARNING
ARNING Risk of burns from hot compo-
nent parts in the engine compartment
Cer tain component parts in the engine com-
partment can be very hot, e.g. the engine, the
cooler and parts of theex haust system. #
Allow the engine tocool down and only
to uch component parts described in the
fo llowing. Maintenance and care
331
331

Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions
Place the key in the
marked space See Owner's
Manual *K
eydetection is malfunctioning. #
Change the location of theke y in theve hicle. #
Place theke y in the slot for starting the engine with theke y (/ page 160). Lights Lights
Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/conseq uences and
uences andM
MSolutions
Solutions
:
Left dipped beam (examp le) *T
he cor responding light source is defecti ve. #
Drive on carefull y. #
Consult a quali/ed specialist workshop immediatel y.
or #
Check whe ther you are permitted toreplace the light source yourself (/ page 140).
% LED light sources: the display message forth e cor responding light appears only when all the light-emitting diodes
in the light are faulty. Display message
s andwarning/indicator lamps
409
409

Displa
Displa
y messag
y messag es
es
ç - - - km/h..................................... 442
È - - - km/h..................................... 442
h - - - km/h..................................... 441
# 12 V battery See Owner's Man-
ual......................................................... 457
ò Acoustic presence indicator
inoperative............................................ .416
: Active Light System inoperative..... 410
¯ AdBlue system fault Emer. op.:
max. XXX km/h Start not poss. in
XXX km.................................................. 466
¯ AdBlue system fault Emer gency
op. in XXX miles See Owner's Manual.... 465
¯ AdBlue system fault Engine
start not possible................................... 466
¯ AdBlue system fault See Own-
er's Manual............................................ 465
5 Add 1 litre engine oil when next
re fuelling ............................................... 467 é
ATTENTION ASSIST inoperati ve..... 441
é ATTENTION ASSIS T:Take a
break!.................................................... 441
: Automatic driving lights inoper-
ative...................................................... 410
Û Battery overheated Stop, every-
body out! Outdoors if possible ................ 418
û Before starting the engine, turn
th e steering wheel.................................. 425
J Brake immediately ........................ 439
Á Change key batteries .................... 407
è Charger cable connected .............. 416
J Check brake 0uid le vel.................. 440
ï Check trailer hitch lock (white
display message) .................................... 422
h Check tyre(s) ................................ 460
! Clean the fuel /lter....................... 430
ÿ Coolant Stop vehicle Switch
engine o............................................... 429 !
currently una vailable See Own-
er's Manual............................................4 52
÷ currently una vailable See Own-
er's Manual............................................4 53
5 Engine oil le vel cannot be meas-
ured....................................................... 468
5 Engine oil le velRe duce oil le vel..... 467
5 Engine oil le velSt op vehicle
Switch engine o.................................... 467
5 Engine oil pressure Stop Switch
o. engine.............................................. 468
ä Fault Drive at max. 80 km/h ......... 451
6 Front leT malfunction Consult
wo rkshop (e xample)...............................4 04
& inoperative Battery low................. 413
& inoperative Char geHV battery...... 414
& inoperati veHigh-voltage battery
ch arging inco mplete ............................... 414
& inoperative Refuel vehicle............. .414
& inoperative See Owner's Man........ 413 Index
493 493

W
W
ar
ar ning syst
ning syst em
em
see ATA (anti-theT alarm system)
W
W ar
ar ning tr
ning tr iangle
iangle
Re moving............................................... 343
Setting up.............................................. 344
W
W ar
ar ning/indicat
ning/indicat or lamp
or lamp
! ABSwarning lamp......................... 481
Ó Active Brake Assist warning lam p..4 80
J Brake system warning lamp (red)... 479
J Brake system warning lamp (yel-
low)....................................................... 478
ÿ Coolant warning lamp (red)........... 474
ÿ Coolant warning lamp (yellow).......4 76
! Electric parking brake indicator
lamp (red).............................................. 478
# Electrical fault warning lamp
...................................................... 473, 477
; Engine diagnosis warning lamp...... 476
å ESP®
OFF warning lam p................ 482
÷ ESP®
wa rning lamp 0ashes........... 481 ÷
ESP®
wa rning lamp lights up......... 482
æ Fuelreser vewarning lamp lights
up.......................................................... 477
Ù Powe r steering warning lamp
(red)...................................................... 473
_ Reduced warning lamp po wer....... 472
6 Restraint system warning lam p...... 470
ü Seat belt warning lamp 0ashes...... 471
ü Seat belt warning lamp lights up.... 472
Ú System er rorwa rning lam p........... 472
! The electric parking brake (yel-
low) indica tor lam p................................. 478
ï Trailer tow hitch warning lam p....... 474
h Tyre pressure monitoring sys-
te m wa rning lamp 0ashes....................... 483
h Tyre pressure monitoring sys-
te m wa rning lamp lights up.................... 484
L Warning lamp for distance
wa rning function.................................... 480
Overview................................................ 469 PA
SSENGER AIR BA G............................... 57
W W arr
arr anty
anty........................................................ 41
W
W ashing b
ashing b y hand (car
y hand (car e)
e)................................ 337
W
W at
at er t
er t ank
ank
see Air-water duct
W
W eat
eat her inf
her inf or
ormation
mation..................................... 299
W
W eb br ow
eb br owsers
sers
Overview................................................ 312
Wheel c
Wheel c hange
hange
Fi tting a new wheel................................ 379
Lo we ring theve hicle.............................. 379
Preparation............................................ 375
Ra ising theve hicle................................. 376
Re moving a wheel................................. .378
Re moving//tting hub caps..................... 375
Wheel c
Wheel c hange
hange
see Emer gency spa rewheel
Wheel rot
Wheel rotation
ation ............................................. 373
Wheels
Wheels Care...................................................... 339
Chec king............................................... 365
Checking the tyre pressure (tyre pres-
sure monitoring system)......................... 368 518
518
Index