2021 MERCEDES-BENZ A-CLASS SALOON check engine

W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions
R The engine coolant pump is faulty
If th ere is an additional warning tone, the coolant temp erature has exceeded 120°C. &
W
WARNING
ARNING Risk of burns when opening the bonnet
If yo u open the bonnet in theeve nt of an overheated engine or /re in the engine compartment, thefo llowing situa-
tions may occur:
R You may come into contact with hot gases.
R You may come into contact with other escaping hot operating 0uids. #
Before opening the bonnet, allow the engine tocool down. #
Intheev ent of a /re in the engine compartment, keep the bonnet closed and call the /re service. #
Stop immediately in accordance with the tra1c conditions and switch o. theve hicle. Do not continue driving. #
Notethe messages on the instrument displa y.
If t If t he coolant t
he coolant t em
emper
per atur
atur e displa
e displa y is at t
y is at the low
he lower end of t
er end of t he t
he tem
emper
per atur
atur e scale:
e scale: #
Consult a quali/ed specialist workshop.
If t
If t he coolant t he coolant t em
emper
per atur
atur e displa
e displa y is at t
y is at the upper end of t
he upper end of t he t
he tem
emper
per atur
atur e scale:
e scale: #
Exit theve hicle and keep a safe distance from it until the engine has cooled down. #
Check the coolant le vel (/ page 330). 474
474
Display message
s andwarning/indicator lamps

W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions #
Make sure that the air supply tothera diator is not obstructed. #
Avoiding high loads on the engine, drive tothe nearest quali/ed specialist workshop. In doing so, ensu rethat the
coolant temp erature display remains below 120°C.
ÿ
Coolant warning lamp (yel-
low) *T
he yellow coolant warning lamp is lit while the engine is running.
Po ssible causes:
R The temp erature sensor is malfunctioning
R The charge air, transmission oil or battery cooling is faulty
R The radiator shutters are bloc ked or defective #
Avoiding high loads on the engine, drive tothe nearest quali/ed specialist workshop.
; Engine diagnosis warning
lamp *T
he yellow engine diagnostics warning lamp is lit while the engine is running.
A malfunction has occur red in the engine, theex haust system or the fuel system.
The emissions limit value may ha vebeen exceeded and the engine may be running in eme rgency operation mode. #
Have theve hicle checked as soon as possible at a quali/ed specialist workshop.
V
V ehicles wit
ehicles wit h a diesel engine:
h a diesel engine: the fuel tank may ha vebeen run dr y. #
Start the engine thre eto four times aTer refuelling.
If th eye llow engine diagnosis warning lamp goes out, emer gency ope ration mode is cancelled. The vehicle need not
be checked. Display messages and
warning/indicator lamps
475
475

Displa
Displa
y messag
y messag es
es
ç - - - km/h..................................... 441
È - - - km/h..................................... 441
h - - - km/h..................................... 440
# 12 V battery See Owner's Man-
ual......................................................... 456
ò Acoustic presence indicator
inoperative............................................ .415
: Active Light System inoperative..... 409
¯ AdBlue system fault Emer. op.:
max. XXX km/h Start not poss. in
XXX km.................................................. 465
¯ AdBlue system fault Emer gency
op. in XXX miles See Owner's Manual.... 464
¯ AdBlue system fault Engine
start not possible................................... 465
¯ AdBlue system fault See Own-
er's Manual............................................ 464
5 Add 1 litre engine oil when next
re fuelling ............................................... 466 é
ATTENTION ASSIST inoperati ve..... 440
é ATTENTION ASSIS T:Take a
break!.................................................... 440
: Automatic driving lights inoper-
ative...................................................... 409
Û Battery overheated Stop, every-
body out! Outdoors if possible ................ 417
û Before starting the engine, turn
th e steering wheel.................................. 424
J Brake immediately ........................ 438
Á Change key batteries .................... 406
è Charger cable connected .............. 415
J Check brake 0uid le vel.................. 439
ï Check trailer hitch lock (white
display message) .................................... 421
h Check tyre(s) ................................ 459
! Clean the fuel /lter....................... 429
ÿ Coolant Stop vehicle Switch
engine o............................................... 428 !
currently una vailable See Own-
er's Manual............................................4 51
÷ currently una vailable See Own-
er's Manual............................................4 52
5 Engine oil le vel cannot be meas-
ured....................................................... 467
5 Engine oil le velRe duce oil le vel..... 466
5 Engine oil le velSt op vehicle
Switch engine o.................................... 466
5 Engine oil pressure Stop Switch
o. engine.............................................. 467
ä Fault Drive at max. 80 km/h ......... 450
6 Front leT malfunction Consult
wo rkshop (e xample)...............................4 03
& inoperative Battery low................. 412
& inoperative Char geHV battery...... 413
& inoperati veHigh-voltage battery
ch arging inco mplete ............................... 413
& inoperative Refuel vehicle............. .413
& inoperative See Owner's Man........ 412 492 492
Index

Apply brake
toselect D or R ...................430
Apply brake toselect R .......................... 430
Au xiliary battery malfunction (red dis-
play message) ....................................... .434
Au xiliary battery malfunction (white
displ aymessage) .................................... 434
Beginning emer gency stop..................... 444
Blind Spot Assist cur rently una vailable
See Owner's Manual.............................. 445
Blind Spot Assist inoperative.................. 446
Blind Spot Assist not available when
to wing a trailer See Owner's Manual ...... 446
Cann otstart engine See Owner's
Manual................................................. .427
Charging fault Please change charging
me thod See Owner's Manual .................416
Charging me thod cur rently una vaila-
ble Please try again or change charg-
ing me thod............................................ 416 Check brake pads See Owner's Man-
ual........................................................
.439
Check tyre pressures then restart Run
Flat Indicator......................................... 462
Clutch overheated Avoid pulling away
until thewa rning goes out...................... 433
Cruise control and Limiter inoperative.... 440
Cruise control inoperative...................... 440
Cruise control o.................................... 441
Depress clutch fully tostart engine........ 433
Device de tected at diagnostics con-
nection See Owner's Manual................. .456
Drive system Malfunction Stop Switch
engine o............................................... 429
Drive system Malfunction Visit work-
shop ...................................................... 429
Fr ont-passenger airbag disabled See
Owner's Manual .................................... .404
Fr ont-passenger airbag enabled See
Owner's Manual .................................... .405 Hazard
warning lamps malfunctioning .... 412
Head-up display cur rently una vailable
See Owner's Manual.............................. 422
Head-up display inoperative ...................423
Limiter inoperative................................. 441
Limiter passive....................................... 441
N permanently active Risk of vehicle
ro lling....................................................4 31
Not possible tounlock charging cable
See Owner's Manual.............................. 415
Only elect ric drive available Power
limited................................................... 416
Only select Park (P) when vehicle is
stationary.............................................. 430
Pa rking Assist and PARKTRONIC inop-
erative See Owner's Manual................... 450
Pa rking lock inoperative Apply the
parking brake ........................................ .432
Place theke y in the mar ked space
See Owner's Manual.............................. 408 Index
495 495

PRE-SAFE inoperati
veSee Owner's
Manual.................................................. 406
Re duce speed........................................ 461
Re duced drive system per form ance
See Owner's Manual.............................. 417
Re versing not poss. Consult workshop ... 431
Risk of vehicle rolling away App ly
parking brake See Owner's Manual ........ 433
Risk of vehicle rolling awayPa rking
brake not applied See Owner's Manual ... 438
Risk of vehicle rolling Driver door
open and transmission not in P .............. 431
Ru n Flat Indica tor inoperative................. 462
Speed limit (winter tyres) XXX km/h .......443
Speed Limit Assist cur rently una vaila-
ble See Owner's Manual........................ 443
Speed Limit Assist inoperative................ 443
Te aching in transmission comple te......... 433 Te
aching in transmission Operate
selector le ver Brake for XX seconds
Risk of vehicle rolling ............................. 432
To shiT out of P or N,depress brake
and start engine.................................... .430
To switch o. the engine, press the
St art/ Stop button for at least 3 sec-
onds or 3 times...................................... 427
Tr a1c Sign Assist cur rently una vaila-
ble See Owner's Manual........................ 445
Tr a1c Sign Assist inoperative................. 445
Tr ansmission Malfunction ....................... 432
Tr ansmission Malfunction Stop............... 431
Tr ansmission Malfunction Visit work-
shop ...................................................... 433
Ty re press. monitor cur rently una vaila-
ble......................................................... 458
Ty re press. monitor inoperative .............. 458
Ty re press. monitor inoperative No
wheel sensors ........................................ 459 Ty
re pressure Check tyres ...................... 461
Ty re(s) ove rheated .................................. 461
Ve hicle not cur rently being charged
Charging station fault............................. 416
Wi per malfunctioning .............................426
Wi thout changing gear, consult work-
shop ............................................. .418, 431
Wi thout starting engine again, consult
wo rkshop ............................................... 418
Dist
Dist ance contr
ance contr ol ol
see Active Distance Assist DISTRONIC
DIS
DIS TR
TRONIC
ONIC
see Active Distance Assist DISTRONIC
Door
Door Additional door loc k................................. 86
Child saf ety lock (rear door )..................... 79
Locking/unlocking (emer gency key)........ .89
Opening (from inside).............................. .86
Unlo cking (from inside)............................ 86
Door contr
Door contr ol panel
ol panel......................................... 18
Dra
Dra wbar
wbar
see Tow- bar system 496
496
Index

E
E
E10
E10.............................................................. 387
Easy entr
Easy entr y f
y feature
eature
Fu nction/no tes...................................... 115
Setting................................................... 116
Easy e Easy e xit f xit featu re
eature
Fu nction/no tes...................................... 115
Setting................................................... 116
EBD (Electr
EBD (Electr onic Br
onic Brak
ake f
e f or
orce Dis
ce Dis tr
tribution)
ibution)
Fu nction/no tes...................................... 218
EC
EC O Assist
O Assist
Fu nction/no tes...................................... 170
EC
EC O display
O display
Fu nction................................................ 168
EC
EC O st
O st ar
ar t/st
t/st op function
op function
Switching o./on.................................... 167
Electr
Electr ic dr
ic drive
ive................................................ 156
Electr
Electr ic par
ic parking br
king br ake
ake
Applying automaticall y........................... 209
Applying/releasing manually.................. 211
Emer gency braking................................ 212
Re leasing automaticall y.......................... 211 Electr
Electr ical fuses
ical fuses
see Fuses
Electr
Electr omagne
omagne tic com
tic compatibility
patibility
Declaration of conformity........................ .29
Electr
Electr onicSt
onic Stability Pr
ability Pr ogr
ogram
am
see ESP ®
(Elect ronic Stability Prog ram)
Emerg
Emerg ency
ency
Assis tance overview................................. 20
Fire extinguisher.................................... 341
Fi rs t-aid kit (soT sided).......................... 341
Re moving thewa rning triangle............... 340
Saf etyve st............................................. 340
Setting up thewa rning triangle............... 341
Emerg
Emerg ency br
ency br aking
aking...................................... 212
Emerg
Emerg ency br
ency br aking
aking
see BAS (Brake Assist System)
Emerg
Emerg ency call
ency call
see Me rcedes-Benz emer gency call system
Eme rg
Emerg encykey
ency key
Inserting/ removing.................................. 84
Locking/unlocking the doors................... 89
Emerg
Emerg ency oper
ency oper ation mode
ation mode
St arting theve hicle............................... .160 Emerg
Emerg
ency
encyshut
shuto.
o.
see Hybrid system
Emerg
Emerg ency spar
ency spar e wheel
e wheel
In0ating................................................. 379
No tes..................................................... 378
Ener Ener gy
gy0ow
0ow display
display
Displayin g.............................................. 293
Fu nction/no tes...................................... 293
Engine
Engine
Engine number....................................... 384
St arting (emer gency ope ration mode ).... 160
St arting (Remo teOnline)........................ 162
Engine data
Engine data Displaying.............................................. 175
Engine electr
Engine electr onics
onics
No tes..................................................... 381
Engine number
Engine number ............................................. 384
Engine oil
Engine oil Additives................................................ 391
Capacity................................................ 392
Checking the oil le vel using the on-
board computer..................................... 328
MB-F reigabe or MB-Appr oval.................. 392
Quality................................................... 392 498 498
Index