fuel MERCEDES-BENZ C-CLASS COUPE 2021 Workshop Manual

Display messages
Possible causes/consequences and M
MSolutions #
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
th e coolant temp erature display remains below 120°C.
ÿ *T
hefan mo tor is defective. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that
th e coolant temp erature display remains below 120 °C.
8
Reserve fuel level *T
he fuel supply has dropped into there ser verange. #
Refuel.
!
Clean the fuel filter *
Ve hicles with diesel engines: the fuel filter is dirty or thewate r inthe fuel filter needs tobe drained. #
Consult a qualified specialist workshop.
¸ Replace air cleaner *
Ve hicles with diesel engines: the engine air filter is dirty and must be replaced. #
Consult a qualified specialist workshop. Display messages and
warning/indicator lamps 449

Engine oil
Display messages
Possible causes/consequences and M
MSolutions
5 Check engine oil level
when next refuelling *T
he engine oil le vel has dropped tothe minimum le vel.
* NO
TEEngine dama gecaused bydriving with insuf ficient engine oil #
Avoid long journe yswith insuf ficient engine oil. #
Check the engine oil le vel when next refuelling.
To p up the engine oil (/ page 366).
No tes on engine oil (/ page 426).
5
Add 1 litre engine oil when
next refuelling *D
isplay message only for cer tain engines:
The engine oil le vel has dropped tothe minimum le vel.
* NO
TEEngine dama gecaused bydriving with insuf ficient engine oil #
Avoid long journe yswith insuf ficient engine oil. #
When next refuelling, add 1 litre of engine oil (/ page 366).
No tes on engine oil (/ page 426). Display messages and
warning/indicator lamps 485

Instrument display (standard)
Wi
descreen co ckpit instrument displ ay Depending on
the display setting, the positions
of the indicator lamps on the instrument display
may dif fer from theex ample shown.
Indicator and warning lamps:
6 Re
stra int sy stem (/ page 489)
ü Seat belt (/
page 489)
ï Trailer hit ch (/page 490)
Ù Powe rst eering (/ page 490)
ÿ Coolanttemp erature (/ page 491)
; Engine diagnostics (/
page 491)
% Ve
hicles with a diesel engine: pre‐
gl ow
# Electrical
fault (/ page 491)
8 Re
ser vefuel with fuel filler flap loca‐
tion indicator (/ page 491)
! Elect
ric pa rking brake (red)
(/ page 494)
! Electric parking brake (yellow)
(/
page 494)
J Brakes (yellow) (/
page 494)
J Brakes (red) (/
page 494) L
Distance warning (/ page 496)
ä AIRMATIC (/ page 496)
ä DYNA MIC BODY CONTROL
(/ page 496)
! ABS (/
page 497)
÷ ESP®
(/ page 497)
å ESP®
OFF (/ page 497)
h Ty
re pressure monitoring sy stem
(/ page 500)
T St
anding lights (/ page121)
L Low beam (/
page121)
K High beam (/
page123)
#! Tu
rn signal lights (/ page123)
R Re
ar fog light (/ page121) 488
Displaymessa ges and warning/indicator lamps

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions #
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.
; Engine diagnosis warning
lamp *T
he yellow engine diagno stics warning lamp is lit while the engine is running.
A malfunction has occu rred in the engine, theex haust sy stem or the fuel sy stem.
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 qualified specialist workshop.
Ve hicles with a diesel engine: the fuel tank may ha vebeen run dr y. #
Start the engine thre eto four times af terre fuelling.
If th eye llow engine diagnosis warning lamp goes out, emer gency operation mode is cancelled. The vehicle need
not be checked.
#
Elect rical fault warning
lamp *T
hered elect rical fault warning lamp is lit.
There is a fault in the electrics. #
Notethe messages on the multifunction displa y. Displ
aymessa ges and warning/indicator lamps 493

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
8 Fu elreser ve wa rning 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. Brakes
Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
! Elect ric pa rking brake indi‐
cator lamp (red)
!
The elect ric pa rking brake
(yellow) indicator lamp *T
he red elect ric pa rking brake indicator lamp flashes or is lit.
The yellow elect ric pa rking brake indicator lamp also lights up in theev ent of a malfunction. #
Notethe messages on the multifunction displa y.494
Display messages and warning/indicator lamps

Sy
stem limits.........................................2 05
Tr ailer operation.................................... 205
Ac tive Parking Assist
Exiting a parking space......................... 223
Fu nction................................................ 220
Pa rking................................................. .222
Sy stem limitations................................. 220
Ac tive Se rvice Sy stem PLUS
see AS SYST PLUS
Ac tive Speed Limit Assi st
Displ ay................................................... 19 0
Fu nction................................................ 19 0
Ac tive Steering Assist
Ac tivating/deactivating......................... 194
Ac tive Emergency Stop Assis t............... 19 5
Fu nction................................................ 19 3
Sy stem limits.........................................1 93
Ad aptive brake lights ................................ 181
Ad aptive cruise control
see Active Dis tance Assi stDISTRONIC
Ad aptive Highbeam Assist Plus
Fu nction................................................ 12 6
Switching on/of f................................... 127Ad
Blue ®
Ad ditives...............................................4 25
Capacity................................................ 426
No tes..................................................... 16 5
Purity..................................................... 425
To pping up............................................. 16 6
Ad ditional door lo ck.................................... 74
Ad diti ves
Ad Blue ®
................................................ 425
Engine oil.............................................. 426
Fu el....................................................... 423
Ad diti ves (AdBlue ®
)
see AdBlue ®
Ad diti ves (engine oil)
see Additives
Ad diti ves (fuel)
see Fuel
Ad dress book
see Contacts
Ad justing bass, mid- range and treble
settings
Adva nced sound sy stem........................3 60Ad
justing mid- range, treble and bass
settings
Adva nced sound sy stem........................3 60
Ad justing the balance/ fader
Adva nced sound sy stem........................3 60
Burmes ter®
sur round sound sy stem..... 360
Ad justing the bass, mid- range and
treble
Burmes ter®
sur round sound sy stem..... 359
Ad justing the mid- range, treble and
bass
Burmes ter®
sur round sound sy stem..... 359
Ad justing the sound focus
Burmes ter®
sur round sound sy stem..... 360
Ad justing treble, mid- range and bass
settings
Adva nced sound sy stem........................3 60
Burmes ter®
sur round sound sy stem..... 359
ADS PLUS damping sy stem
see AIRMATIC
Ad vanced sound sy stem
Ad justing the balance/fader................. 360 Index
503

DIRECT SELECT le
ver
Engaging drive position........................ .159
Engaging neutral................................... .158
Engaging park position.......................... 15 9
Engaging pa rkposition automatically....1 59
Engaging reve rsege ar........................... 15 8
Fu nction................................................ 157
Display (care) ............................................ .374
Display (multimedia sy stem)
Settings................................................. 263
Display (on-boa rdcompu ter)
Displ ays on the multifunction displa y.... 236
Displ aymessage
Calling up (on-board compu ter)............. 433
No tes....................................................4 33
Display messages ¯ - - - km/h ..................................... 458
ç - - - km/h ..................................... 459
È - - - km/h ..................................... 459
# 12V battery See Owner's Man‐
ual..........................................................4 74Û
48 V battery See Owner's Man‐
ual.......................................................... 476
: Active Light Sy stem inoperative... 440
¯ AdBlue sy stem fault Emer. op.:
max. XXX mphSt art not poss. in XXX
miles .................................................... .484
¯ AdBlue sy stem fault Emer‐
ge ncy op. in XXX km See Owner's
Manual.................................................. 483
¯ AdBlue sy stem fault Engine
st art not possible................................. .484
¯ AdBlue sy stem fault See Own‐
er's Manual .......................................... .483
5 Add 1 litre engine oil when
next refuelling....................................... 485
é ATTENTION ASSIST inoperative ....458
é ATTENTION ASSIS T:Take a
break!....................................................4 58
: Automatic driving lights inoper‐
ative...................................................... 439 Á
Change key bat teries .................... 437
J Check brake fluid le vel................. 456
# Check brake pads See Owner's
Manual.................................................. 457
5 Check engine oil le vel when
next refuelling....................................... 485
ï Checktrailer hitch lo ck................ 443
h Check tyre(s) ................................ 478
! Clean the fuel filter ...................... 449
ÿ Coolant Stop vehicle Switch
engine off..............................................4 48
! currently una vailable See Own‐
er's Manual .......................................... .469
÷ currently una vailable See Own‐
er's Manual .......................................... .470
5 Engine oil le vel cannot be
measured .............................................. 487
5 Engine oil le velRe duce oil le vel.... 486
5 Engine oil le velSt op vehicle
Switch engine off.................................. 486 Index
511

5
Engine oil pressure Stop
Switch off engine.................................. 487
ä Fault Drive at max. 80 km/h........ 466
6 Front left malfunction Consult
wo rkshop (e xample).............................. 434
_ Front left seat backrest not
loc ked (e xamp le).................................. .447
& inoperative Battery low................ 442
& inoperative Refuel vehicle ............ 442
& inoperative See Owner's Man...... 442
! inoperative See Owner's Man‐
ual......................................................... 470
÷ inoperative See Owner's Manual ..471
T inoperative See Owner's Man‐
ual......................................................... 472
G Inoperative................................... 474
: Intellige nt Light Sy stem inoper‐
ative...................................................... 440
Á Key not de tected (red displ ay
messa ge)............................................... 438 Á
Key not de tected (white displ ay
messa ge)............................................... 437
: Left dipped beam (e xamp le)........ .439
6 Left wind owbag malfunction
Consult workshop (e xample)................ .434
¢ Lowe ring...................................... 467
: Malfunction See Owner's Man‐
ual......................................................... 439
ð Maximum speed exceeded ........... 460
Ø ..................................................... 482
ç Off................................................4 60
ë Off................................................ 457
! Parking brake See Owner's
Manual .................................................. 453
É Please reduce speed .................... 468
Ý Please wait 48 V battery charg‐
ing ........................................................ .476
_ Rear left seat backrest not
loc ked (Example)................................... 446
h Rectify tyre pressure.................... 479Ø
Refill Ad Blue See Owne r’s
Manual.................................................. 482
! Release parking brake .................. 456
¸ Replace air cleaner ......................449
Á Replace key.................................. 437
8 Reser vefuel le vel......................... 449
6 Restra int sys. malfunction Con‐
sult workshop........................................ 434
# See Owner's Manual....................4 75
Ù Steering malfunction Incre ased
ph ysical ef fort See Owner's Manual ......444
Ù Steering malfunction Stop
immediately See Owner's Manual .........445
# Stop vehicle Lea veengine run‐
ning ....................................................... 476
# Stop vehicle See Owner's Man‐
ual......................................................... 475
É Stop vehicle Vehicle too low......... 466
ç suspended...................................4 59
: Switch off lights ........................... 440512
Index

Flacon
Inserting/removin g............................... 137
Flat towing
see Tow- bar sy stem
Flat tyre MOEx tended tyres................................. 379
No tes..................................................... 378
TIREFIT kit............................................. 380
Wheel chang e....................................... .409
Floor mats.................................................. 11 9
Fo g light (enhanced) .................................1 25
Fo il co vering
Ra dar and ultrasonic sensor s................175
Fr ag rance
see Fragrance sy stem
Fr ag rance sy stem
Inserting/removing theflacon.............. .137
Setting................................................... 137
Fr ee software.............................................. 36
Fr equencies
Tw o-w ayradio........................................ 417
Fr ont airbag (driver, front passenger)...... .44Fr
ont passenger seat
see Seat
Fu el
Ad ditives...............................................4 23
Diesel.................................................... 423
E10....................................................... .422
Fu elreser ve........................................... 424
Low outside temp eratures..................... 423
Pe trol..................................................... 422
Quality (diesel)...................................... 423
Quality (p etro l)...................................... 422
Re fuelling.............................................. 16 2
Sulphur content..................................... 422
Ta nk content.......................................... 424
Fu nction seat
see Door cont rol panel
Fu ses
Before replacing a fuse.......................... 395
Fu se assignment diagram..................... 395
Fu se box in the boot.............................. 398
Fu se box in the engine compartmen t.... 396
Fu se box in the front passenger foot‐
we ll....................................................... 398
Fu se box on the dashboard................... 397
No tes....................................................3 95 G
Garage door opener Clearing the memory.............................1 71
Programming buttons............................ 16 9
Re solving problems................................ 171
Synchronising thero lling code............. .170
Garage door openers Opening/closing the door...................... 171
Gearshift recommendation..................... .160
Gene ral operating permit number (EU)... 41 8
Genuine parts.............................................. 22
Genuine wood (Care) ................................ .374
Glide mode................................................. 161 H
Handbrake see Electric parking brake
Handling characteristics (unusual)......... 399
HANDS-FREE ACCESS ................................ .82
Hazard warning lights.............................. .123 518
Index

Head-up display menu........................... 238
Multifunction displa
y............................. 236
Ope rating.............................................. 235
Overview of menus................................ 235
On-board diagnostics in terface
see Diagnostics connection
On-board electronics Engine electronics................................. 416
No tes..................................................... 416
Tw o-w ayradios...................................... 416
Online services Data storage............................................ 35
Open-source software................................36
Opening the boot lid using your foot
HANDS-FREE ACCES S............................. 82
Ope rating fluids
Ad Blue ®
................................................ 425
Ad ditives (fuel)......................................4 23
Brake fluid............................................ .427
Coolant (engine)................................... .428
Engine oil.............................................. 426
Fu el (diesel)...........................................4 23
Fu el (petrol)........................................... 422
No tes....................................................4 20Wi
ndsc reen washer fluid...................... .429
Operating saf ety
48 V on-board electrical sy stem.............. 23
Declaration of confo rmity (elect ro‐
magnetic compatibility)........................... 25
Declaration of conformity (jack).............. 28
Declaration of conformity (TIREFIT kit).... 29
Declaration of conformity (wire less
ve hicle components)............................... 25
EQ Boost tech nology............................... 23
Information.............................................. 23
Ope rating sy stem
see On-board computer
Optimised acceleration Activating.............................................. 14 8
Outside mir rors
Anti-dazzle mode (automatic)................ 13 3
Au tomatic mir rorfo lding function......... .134
Fo lding in/out....................................... 13 2
Operating the memory function............1 08
Pa rking position..................................... 13 3
Setting................................................... 13 2
Overhead control panel Overview................................................. 14Owner's Manual
Vehicle equipment................................... 23
Owner's Manual (digital)............................ 20 P
Pa int code .................................................. .418
Pa intwork (cleaning instructions) ............371
Pa norama sliding sunroof
see Sliding sunroof
Pa rk position
Inserting................................................ 15 9
Selecting au tomatically......................... 15 9
Pa rking
see Electric parking brake
Pa rking aid
see Parking Assist PARKTRONIC
Pa rking Assist PARKTRONIC
Ac tivating.............................................. 220
Ad justing warning tones........................ 220
Deactivating.......................................... 220
Fu nctio n................................................. 217
Side impact pr otection.......................... 218
Sy stem limitations................................. 217526
Index