check engine MERCEDES-BENZ E-CLASS SALOON 2021 User Guide

R
Fuse box on the driver's side of the cockpit
(/ page 394)
R Fuse box in the front passenger foot we ll
(/ page 394)
R Fuse box in the boot on theright-hand side of
th eve hicle, when vie wed in the direction of
tr ave l (/ page 394) Opening and closing t
Opening and closing t
he fuse bo
he fuse box in t
x in the engine
he engine
com
com par
partment
tment R
R
eq
eq uir
uir ements:
ements:
R A dry clo thand a scr ewdriver are available.
Obser vethe no tes on elect rical fuses
(/ page 392).
Opening
Opening &
W
WARNING
ARNING Risk of injury from using the
windscreen wipers when the bonnet is
open
If th e windscreen wipers start moving when
th e bonnet is open, you could be trapped by
th e wiper linkage. #
Always switch o. the windscreen wipers
and theve hicle /r stifyo u need toopen
th e bonnet. #
Turn clips 2on co ver1 aqu arter-turn to
anti-clockwise. #
Pull co ver1 upwards in the direction of the
ar ro w. #
Remo veany existing moisture from the fuse
box using a dry clo th. #
Loosen scr ews4 and remo vefuse box lid 3
from theto p.
Closing
Closing #
Check whe ther the seal is positioned cor rectly
in cap 3. Breakdown assistance
393
393

Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/consequences and uences and0050
0050Solutions
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 168). Lights Lights
Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/conseq uences and
uences and0050
0050Solutions
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.
% LED light sources: the display message forth e cor responding light appears only when all the light-emitting diodes
in the light are faulty.
: Malfunction See Owner's
Manual *T
heexterior lighting is malfunctioning. #
Consult a quali/ed specialist workshop.
*V Vehicles wit ehicles wit h a tr
h a trailer hitc
ailer hitc h:
h:a fuse may ha veblown. #
Stop theve hicle in accordance with the tra1c conditions. #
Check the fuses and replace them if necessary (/ page 392).440
440
Display messages and
warning/indicator lamps

Engine
Engine
Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/consequences and uences and0050
0050Solutions
Solutions
To switch off the engine,
press the Start/Stop but-
ton for at least 3 seconds
or 3 times. *Y
ou ha vepressed the start/s top button while theve hicle is in motion. #
Information about switching o. theve hicle while driving (/ page 168).
Cannot start engine See
Owner's Manual *T
hevehicle cann otbe star ted. #
Switch theve hicle o. and switch it back on #
Ifth e display message still appears, consult a quali/ed specialist workshop.
00BD
Top up coolant See Own-
er’s Manual *T
he coolant le vel is too lo w.
* N NO
OTE
TE Engine damage due toinsu1cient coolant #
Avoid long journe yswith insu1cient coolant. #
Add coolant (/ page 365). #
Have the engine cooling system checked at a quali/ed specialist workshop. 458
458
Displ
aymessages and warning/indicator lamps

Engine oil
Engine oil
Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/consequences and uences and0050
0050Solutions
Solutions
00B3
Check eng. oil lev. when
next refuelling *T
he engine oil le vel has dropped tothe minimum le vel.
* N
NO OTE TE Engine damage caused bydriving with insu1cient engine oil #
Avoid long journe yswith insu1cient engine oil. #
Check the engine oil le vel when next refuelling.
To p up the engine oil (/ page 364).
No tes on engine oil (/ page 423).
00B3
Add 1 litre engine oil when
next refuelling *D
isplay message onlyfor cer tain engines:
The engine oil le vel has dropped tothe minimum le vel.
* N
NO OTE TE Engine damage caused bydriving with insu1cient engine oil #
Avoid long journe yswith insu1cient engine oil. #
When next refuelling, add 1 lit reof engine oil (/ page 364).
No tes on engine oil (/ page 423). Displ
aymessages and warning/indicator lamps
497
497

Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/consequences and uences and0050
0050Solutions
Solutions
00B3
Engine oil level Reduce oil
level *D
isplay message onlyfor cer tain engines:
The engine oil le vel is too high.
* N
NO OTE TE Engine damage caused bydriving with excess engine oil #
Avoid long journe yswith excess engine oil. #
Consult a quali/ed specialist workshop immediately and ha vethe engine oil le velre duced.
00B3 Engine oil level Stop vehi-
cle Switch engine off *D
isplay message onlyfor cer tain engines:
The engine oil le vel is too lo w.
* N
N O OTE
TE Engine damage caused bydriving with insu1cient engine oil #
Avoid long journe yswith insu1cient engine oil. #
Stop theve hicle immediately in accordance with the tra1c conditions. Do not continue driving. #
Switch o. theve hicle. #
Add 1 l of engine oil (/ page 364). #
Check the engine oil le vel.
No tes on engine oil (/ page 423).498
498
Displ
aymessages and warning/indicator lamps

W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences and0050
0050Solutions
Solutions #
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 365). #
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. 506
506
Displ
aymessages and warning/indicator lamps

W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences and0050
0050Solutions
Solutions
00B9
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.
003D Electrical fault warning lamp *T
hered electrical fault warning lamp is lit.
There is a fault in the electrics. #
Notethe messages on the instrument displa y.
00B6
Fu elreser vewarning lamp
lights up *T
he yellow fuel reser vewarning lamp lights up while the engine is running.
The fuel supply has dropped into there ser verange. #
Refuel. Display messages and
warning/indicator lamps
507
507

Engaging park position automaticall
y...... 187
Fu nction................................................ 186
Selecting park position........................... 187
Displa
Displa y (car
y (care)
e)............................................... 372
Displa
Displa y (MBUX multimedia syst
y (MBUX multimedia syst em)
em)
Home sc reen......................................... 313
Operating.............................................. 314
Displa
Displa y (on-boar
y (on-boar d com
d comput
puter)
er)
Displa yson the inst rument displa y......... 286
Displa
Displa y in t
y in the windscr
he windscr een
een
see Head-up display
Displa
Displa y message
y message
Calling up (on-board computer).............. 433
No tes..................................................... 433
Displa
Displa y messag y messag es
es
ç - - - km/h.................................... .470
00CB - - - km/h..................................... 469
h - - - km/h..................................... 469
003D 12 V battery See Owner's Man-
ual......................................................... 486
00D7 48 V battery See Owner's Man-
ual......................................................... 488 ò
Acoustic presence indicator
inoperative............................................ .447
: Active Light System inoperative..... 441
0099 AdBlue system fault Emer. op.:
max. XXX km/h Start not poss. in
XXX km.................................................. 496
0099 AdBlue system fault Emer gency
op. in XXX miles See Owner's Manual.... 495
0099 AdBlue system fault Engine
start not possible................................... 496
0099 AdBlue system fault See Own-
er's Manual............................................ 495
00B3 Add 1 litre engine oil when next
re fuelling ............................................... 497
é ATTENTION ASSIST inoperati ve..... 468
é ATTENTION ASSIS T:Take a
break!.................................................... 468
: Automatic driving lights inoper-
ative...................................................... 441 00D7
Battery overheated Stop, every-
body out! Outdoors if possible ................ 449
Á Change key batteries .................... 438
00E5 Charger cable connected .............. 447
004D Check brake 0uid le vel.................. 467
00B3 Check eng. oil le v.when next
re fuelling ............................................... 497
ï Check trailer hitch lo ck(white
display message) .................................... 453
0077 Check tyre(s) ................................ 490
003A Clean the fuel /lter....................... 460
ÿ Coolant Stop vehicle Switch
engine o............................................... 459
0025 currently una vailable See Own-
er's Manual............................................4 81
00E5 currently una vailable See Own-
er's Manual............................................4 82
00B3 Engine oil le vel cannot be meas-
ured....................................................... 499
00B3 Engine oil le velRe duce oil le vel..... 498 524 524
Index

Ac
tive Distance Assist inoperative.......... 471
Ac tive Lane Keeping Assist cur rently
una vailable See Owner's Manual ............ 476
Ac tive Lane Keeping Assist inoperative... 476
Ac tive Steering Assist cur rently
una vailable due tomultiple emer-
ge ncy stops........................................... 472
Ac tive Steering Assist cur rently
una vailable See Owner's Manual ............ 472
Ac tive Steering Assist inoperative...........4 72
Ac tive Stop-and-Go Assist cur rently
una vailable see Owner's Manual .............473
Ac tive Stop-and-Go Assist inoperative
See Owner's Manual.............................. 473
Ad aptive Highbeam Assist cur rently
una vailable See Owner's Manual ............ 442
Ad aptive Highbeam Assist inoperative ....4 42
Ad aptive Highbeam Assist Plus cur-
re ntly una vailable See Owner's Manual ... 443Ad
aptive Highbeam Assist Plus inop-
erative.................................................. .443
Apply brake todeselect Park (P) posi-
tion....................................................... .461
Apply brake toselect D or R ...................461
Apply brake toselect R .......................... 461
Au xiliary battery malfunction (red dis-
play message) ....................................... .463
Au xiliary battery malfunction (white
displ aymessage) .................................... 463
Beginning emer gency stop..................... 472
Blind Spot Assist cur rently una vailable
See Owner's Manual.............................. 474
Blind Spot Assist inoperative.................. 474
Blind Spot Assist not available when
to wing a trailer See Owner's Manual ...... 475
Cann otstart engine See Owner's
Manual.......................................... 458, 489
Charging fault Please change charging
me thod See Owner's Manual .................448 Charging me
thod cur rently una vaila-
ble Please try again or change charg-
ing me thod............................................ 448
Check brake pads See Owner's Man-
ual........................................................ .467
Check tyre pressures then restart Run
Flat Indicator......................................... 493
Cruise control and Limiter inoperative.... 469
Cruise control inoperative...................... 469
Cruise control o....................................4 69
Device de tected at diagnostics con-
nection See Owner's Manual................. .486
Fr ont-passenger airbag disabled See
Owner's Manual .................................... .436
Fr ont-passenger airbag enabled See
Owner's Manual .................................... .437
Hazard warning lamps malfunctioning .... 443
Head-up display cur rently una vailable
See Owner's Manual.............................. 454
Head-up display inoperative ...................455 Index
527 527

Limiter inoperative................................
.469
Limiter passive....................................... 469
Mo tor can be star ted again .................... 489
N permanently active Risk of vehicle
ro lling....................................................4 62
Not possible tounlock charging cable
See Owner's Manual.............................. 447
Only elect ric drive available Power
limited................................................... 448
Only select Park (P) when vehicle is
stationary.............................................. 460
Pa rking Assist and PARKTRONIC inop-
erative See Owner's Manual................... 481
Place theke y in the mar ked space
See Owner's Manual.............................. 440
PRE-SAFE impulse side inoperative
See Owner's Manual.............................. 438
PRE-SAFE inoperative See Owner's
Manual.................................................. 438
Re duce speed........................................ 492 Re
duced drive system per form ance
See Owner's Manual.............................. 448
Re versing not poss. Consult workshop ... 462
Risk of vehicle rolling Driver door
open and transmission not in P .............. 461
Ru n Flat Indica tor inoperative................. 493
Speed limit (winter tyres) XXX km/h .......471
St op vehicle Lea veengine running
Wa itTransmission cooling ......................463
To shiT out of P or N,depress brake
and start engine.................................... .461
To switch o. the engine, press the
St art/ Stop button for at least 3 sec-
onds or 3 times...................................... 458
Tr a1c Sign Assist cur rently una vaila-
ble See Owner's Manual........................ 474
Tr a1c Sign Assist inoperative................. 474
Tr ansmission Malfunction Stop............... 462
Ty re press. monitor cur rently una vaila-
ble......................................................... 489 Ty
re press. monitor inoperative .............. 489
Ty re press. monitor inoperative No
wheel sensors ........................................ 490
Ty re pressure Check tyres ...................... 493
Ty re(s) ove rheated .................................. 492
Ve hicle not cur rently being charged
Charging station fault............................. 447
Wi per malfunctioning .............................457
Wi thout changing gear, consult work-
shop ............................................. .450, 462
Wi thout starting engine again, consult
wo rkshop ............................................... 450
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................................. 81
Child saf ety lock (rear door )..................... 75
Locking/unlocking (emer gency key)........ .85
Opening (from inside).............................. .82
Po we r closing function............................. 85 528
528
Index