clock MERCEDES-BENZ B-CLASS HATCHBACK 2021 Owners Manual

In
thefo llowing situations, there is a danger of
being loc ked out when the function is activated:
R while theve hicle is being tow- star ted or
pushed
R ifth eve hicle is being tested on a roller dyna-
mome ter Loc
Loc
king/unloc
king/unloc king t
king the v
he vehicle wit
ehicle wit h t
h the emer-
he emer-
g
g ency key
ency key Loc
Loc
king/unloc
king/unloc king t
king the dr
he driv
iver's door wit
er's door wit h t
h the
he
emerg
emerg encykey
ency key
% Ifyo u wish tolock theve hicle entirely using
th e emer gency key,/rst press the button for
locking from the inside while the driver's door
is open. Then proceed tolock the driver's
door using the emer gency key. #
Remo vethe emer gency key (/ page 83). #
Inse rtthe emer gency key as far as it will go
into opening 1inthe co ver. #
Pull and hold the door handle. #
Pull the co ver on the emer gency key as
straight as possible away from theve hicle until
it re leases. #
Release the door handle. #
T To unloc o unloc k:
k:turn the emer gency key anti-cloc k-
wise toposition 0047. #
T
To loc
o loc k:
k:turn the emer gency key clockwise to
position 0047. #
Carefully press the co ver onto the lock cylin-
der until it engages and is seated /rml y.88
88
Opening and closing

Loc
Loc
king t
king t he fr
he front passeng
ont passeng er door and r
er door and r ear doors
ear doors #
Insert a suitable object, e.g. the emer gency
ke y,into opening 1onthe door loc k. #
T
To loc
o loc k t
k the
he leT-hand
leT-hand side of t
side of the v
he vehicle:
ehicle: turn
th e emer gency key anti-clockwise as far as it
will go. #
T
To loc
o loc k t
k the r
he r ight-hand side of t
ight-hand side of t he v
he vehicle:
ehicle: turn
th e emer gency key clockwise as far as it will
go.
If th e loc ked door is then closed, it can no longer
be opened from the outside. Load com
Load com
par
partment
tment Opening t
Opening t
he t
he tailg
ailgate
ate &
D
DAN
AN GER
GER Risk of poisoning from exhaust
ga ses
Combustion engines emit poisonous exhaust
ga ses, such as carbon monoxide. Exhaust
ga ses can enter theve hicle interior if theta il-
ga te is open when theve hicle is running,
especially if theve hicle is in motion. #
Always switch o. theve hicle before
opening theta ilgate. #
Never drive with theta ilgate open. *
N
NOOTE
TE Damage totheta ilgate caused by
obstacles abo vetheve hicle The
tailgate swings rear wa rds and upwards
when it is opened. #
Make sure that there is su1cient space
behind and abo vetheta ilgate. #
Pull theta ilgate handle. #
V
Vehicles wit
ehicles wit h HANDS-FREE A
h HANDS-FREE A CCESS:
CCESS:make a
kicking mo vement with your foot below the
bumper (/ page 92). Opening and closing
89
89

#
T
To r
o r emov
emov e:
e:turn co ver1 tothe leT and
re mo veit from the wheel ar chliner. #
T
To
o /t:
/t: insert co ver1 into the wheel ar chliner
and turn it totheright until it engages.
R
R eplacing light sour
eplacing light sour ces in t
ces in t he halog
he halog en headla mp
en headlamp
R
R eq
eq uir
uir ements:
ements:
R Lo
Low beam:
w beam: an H7 55 W light source is availa-
ble.
R High beam:
High beam: an H7 55 W light source is availa-
ble. 1
Low beam housing co ver
2 High beam housing co ver #
Switch the lighting system o.. #
Remo vethe co ver in the front wheel ar ch
( / page 148). #
Turn there leva nt housing co ver anti-clockwise
and remo veit. #
Turn the soc ket anti-clockwise and remo veit. #
Pull the light source out of the soc ket. #
Inse rtthe new light source into the soc ket
such that the entire base of the light source is
re sting on the bottom of the soc ket. #
Inse rtthe soc ket and turn it clockwise. #
Press on the housing co ver and turn it cloc k-
wise. #
Replace the co ver in the front wheel ar ch
( / page 148). Changing t
Changing t
he r
he rear bulbs (v
ear bulbs (v ehicles wit
ehicles with halog
h halogen
en
headlam
headlam ps)
ps) R R
eplacing t
eplacing t he t
he t ail lam
ail lam p bulbs
p bulbs #
Due totheir locations, ha vethe bulbs forthe
turn signal light and reve rsing light changed at
a qu ali/ed specialist workshop. W W
indscr
indscr een wiper
een wiper s and windscr
s and windscr een w
een washer sy
asher sy s-
s-
t
t em
em Switc
Switc
hing t
hing t he windscr
he windscr een wiper
een wipers
son/o.
on/o. 0047
005AWindsc reen wipers o.
0048 0062 Automatic wiping, normal
0049 0063 Automatic wiping, frequent Light and sight
149
149

1
Fuel /ller 0ap
2 Brac ketfo r fuel /ller cap
3 Tyre pressure table
4 Fuel type
5 QR code forre scue card #
Press on the back area of fuel /ller 0ap 1.#
Turn the fuel /ller cap anti-clockwise and
re mo veit. #
Insert fuel /ller cap from abo veinto brac ket
2 . #
Comple tely insert the pump nozzle into the
ta nk /ller nec k,hook in place and refuel. #
Only /ll the fuel tank until the pump nozzle
switches o..
% V Vehicles wit ehicles wit h a diesel engine:
h a diesel engine: theta nk /ller
neck is designed forre fuelling at diesel /lling
pumps.
% V
Vehicles wit
ehicles wit h a diesel engine:
h a diesel engine: whenthe fuel
ta nk is comple tely em pty, top up with at least
5 litres of diesel.
% V
V ehicles wit
ehicles wit h a diesel engine:
h a diesel engine: use a /ller neck
with a lar gediame terfo rve hicles with a diesel
engine when topping up fuel from a fuel can.
Otherwise, the /ller neck cannot slide into the
ta nk. #
Replace the cap on the /ller neck and turn
clockwise until it engages audibl y. #
Close fuel /ller 0ap 1. A
A
dBlue
dBlue ®
®
(v
(vehicles wit
ehicles wit h a diesel engine onl
h a diesel engine onl y)
y) N
No
ot
tes on
es on r
re/lling
e/lling A
AdBlue
dBlue ®
®
Ad Blue ®
is a water-soluble 0uid forth e NOx
ex haust gas aTertreatment of diesel engines. In
order forth eex haust gas aTertreatment tofunc-
tion proper ly, only use AdBlue ®
in acco rdance
with ISO 22241.
Ad Blue ®
is ch aracterised bythefo llowing:
R non-t oxic
R colourless and odourless
R non-0ammable
If yo u open theAd Blue ®
tank, small amounts of
ammonia vapour may be released. Only /ll the
Ad Blue ®
tank in well-ventilated areas.
Do not let AdBlue ®
come into contact wi thskin,
ey es or clo thes. Keep AdBlue ®
awa y from chil-
dren.
Do not ingest AdBlue ®
. If AdBlue ®
is swallo wed,
immediately rinse your mouth out thoroughl y.
Drink plenty of water. Seek medical at tention at
once. Driving and parking
195 195

Opening t
Opening t
he A
he AdBlue
dBlue ®
®
/ller
/ller cap
cap #
Press on the back area of fuel /ller 0ap 1.#
Turn AdBlue ®
/ller cap 2anti-clockwise and
re mo veit.
% You can also store theAd Blue ®
/ller cap in
th e fuel /ller cap holder in the fuel /ller 0ap
hinge arm. T
T opping up A
opping up A dBlue
dBlue®
®
Mercedes-Benz recommends topping up AdBlue ®
at a /lling pump. If no AdBlue ®
/lling pump is
av ailable, you can also top up AdBlue ®
using a
canister. #
Screw onthefa stener of AdBlue ®
re/ll canis-
te r4. #
Screw disposable hose 3onto the opening
of Ad Blue ®
re/ll canis ter4 until hand-tight. #
Screw disposable hose 3onto the /ller neck
of theve hicle until hand-tight. #
LiT up and tip AdBlue ®
re/ll canis ter4.
The /lling process stops when theAd Blue ®
ta nk is comple tely full.
Ad Blue ®
re/ll canis ter4 can be remo ved
when it has been only partially em ptied. #
Unscr ewand close disposable hose 3and
Ad Blue ®
re/ll canis ter4 inreve rse order. #
Replace AdBlue ®
/ller cap 2and turn it
clo ckwise until it audibly engages. #
Close fuel /ller 0ap 1. #
Switch on theve hicle for at least 60 seconds.
% Ifth eve hicle could not be star ted as the
Ad Blue ®
tank was em pty, it can take up to
60 seconds forth ere /ll tobe de tected. #
Start theve hicle.
% Avoid storing AdBlue ®
re/ll con tainers perma-
nently in theve hicle. Driving and parking
197
197

&
W
W ARNI NG
ARNI NGRisk of /re and injury from
engine oil
If engine oil comes into contact with hot com-
ponent parts in the engine compartment, it
may ignite. #
Make sure that no engine oil is spilled
next tothe /ller opening. #
Allow the engine tocool o. and thor-
oughly clean the engine oil from compo-
nent parts before starting theve hicle. *
N
NO OTE
TE Engine damage caused byan inco r-
re ct oil /lter, incor rect oil or additi ves #
Do not use engine oils or oil /lters which
do not cor respond tothe speci/cations
ex plicitly prescribed forth e service inter-
va ls. #
Follow the inst ructions on the service
inter val display forch anging the engine
oil and obser vethe prescribed change
inter vals. #
Do not use additives. *
N
NOOTE
TE Damage caused bytopping up too
much engine oil To
o much engine oil can damage the engine or
th e catalytic con verter. #
Have excess engine oil remo ved at a
qu ali/ed specialist workshop. %
Depending on driving st yle, theve hicle con-
sumes up to0.8 litre of oil per 1000 km. The
oil consum ption may be higher than this when
th eve hicle is new or if you frequently drive at
high engine speeds. #
Turn cap 1anti-clockwise and remo veit. #
Top up the engine oil. #
Replace cap 1and turn it clockwise until it
engages. #
Check the oil le vel again (/ page 340). Maintenance and care
341
341

Chec
Chec
king t
king t he coolant lev
he coolant lev el
el &
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. &
W
WARNING
ARNING Risk of scalding from hot cool-
ant
If yo u open the cap, you could be scalded. #
Let the mo tor cool down before opening
th e cap. #
When opening the cap, wear pr otective
glo ves and saf ety glasses. #
Open the cap slo wlytorelease pressure. #
Park theve hicle on a le vel sur face. #
Check the coolant temp erature display in the
inst rument cluster.
The coolant temp erature must be below 70°C. #
Slowly turn cap 1anti-clockwise torelease
ove rpressure. #
Continue turning cap 1anti-clockwise and
re mo veit. The coolant le
vel is cor rect in thefo llowing cases:
R Ifth e engine is cold, the coolant is up to
mar ker bar 2.
R Ifth e engine is warm,th e coolant is up to
1.5 cm overth e mar ker bar 2. #
If necessar y,top up with coolant that has
been appr ovedfo r Mercedes-Benz.
% Further information on coolant (/ page 404) T
T
opping up t
opping up t he windscr
he windscreen w
een washer syst
asher syst em
em &
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. 342
342
Maintenance and care

#
Pull plug 7with the cable and /ller hose 3
out of the tyre in0ation compressor housing. #
Insert tyre sealant bottle 9in soc ket6 of
th e tyre in0ation compressor in such a way
th at there d ar row on tyre sealant bottle 9
matches there d ar row on the tyre in0ation
compressor. #
Turn tyre sealant bottle 9aqu arter turn
clockwise. #
Insert the plug of /ller hose 3in soc ket5
of tyre sealant bottle 9. #
Turn /ller hose 3aqu arter turn clockwise. #
Remo vetheva lve cap from valve A onthe
fa ulty tyre. #
Screw union nut 4of /ller hose 3onto
va lve A. #
Insert plug 7into a 12 V soc ket in your vehi-
cle. #
Turn theke yto position 0047inthe ignition loc k. #
Press on and o. switch 8onthe tyre in0a-
tion compressor.
The tyre in0ation compressor is switched on.
The tyre is in0ated. Firs t, tyre sealant is pum-
ped into the tyre. The pressure may brie0y rise
to appr oximately 500 kPa (5 bar/73 psi).
Do no Do no t switc
t switc h
ho.
o. t
the tyr
he tyr e
ein0ation
in0ation com
compr
pressor
essor
dur
dur ing t
ing t his phase!
his phase! #
Let the tyre in0ation compressor runfo r a
maximum of ten minutes.
The tyre should then ha veattained a tyre pres-
sure of at least 200 kPa (2.0 bar/29 psi).
If tyre sealant leaks out, make sure you clean the
a.ected area as quickly as possible. It is prefera-
ble touse clean water.
If yo uget tyre sealant on your clo thing, ha veit
cleaned as soon as possible with per chloroe thy-
lene.
If, If, aTer
aTer t
ten minut
en minut es, a tyr
es, a tyre pr
e pressur
essur e of 200 kPa
e of 200 kPa
(2.0 bar/29 psi) has no
(2.0 bar/29 psi) has no t been att
t been att ained:
ained: #
Switch o. the tyre in0ation compressor. 358
358
Breakdown assistance

+
ENVIR
ENVIR
ONMENT
ONMENT AL NO
AL NOTE
TE Environmen tal
pollution caused byenvironmentally ir re-
sponsible disposal Ty
re sealant contains pollu tants. #
Have the tyre sealant bottle disposed of
professionall y,e.g. at a Mercedes-Benz
Service Centre. #
Stow the tyre sealant bottle, the tyre in0ation
compressor and thewa rning triangle. #
Pull awa
Pull away immediat
y immediat ely.
el y. #
Stop driving aTer appr oximately ten minutes
and check the tyre pressure using the tyre
in0ation compressor.
The tyre pressure must now be at least
130 kPa (1.3 bar/19 psi). &
W WARNING
ARNING Risk of accident due tothe
speci/ed tyre pressure not being attained
If th e speci/ed tyre pressure is not reached,
th e tyre is too badly damaged. The tyre seal-
ant cannot repair the tyre in this instance. The braking and driving
characteristics may be
gr eatly impaired. #
Do not continue driving. #
Consult a quali/ed specialist workshop. Countr
Countr
ies t
ies that hav
hat hav e Mer
e Mercedes-Benz Ser
cedes-Benz Ser vice24h:
vice24h:
yo u will /nd a stic ker with thete lephone number,
e.g. on the B‑pillar on the driver's side. #
Correct the tyre pressure if it is still at least
130 kPa (1.3 bar/19 psi). See the tyre pres-
sure table on the fuel /ller 0ap forva lues.
Incr
Incr easing t
easing t he tyr
he tyre pr
e pressure
essure #
Switch on the tyre in0ation compressor.
Decr
Decr easing t
easing t he tyr
he tyre pr
e pressure
essure #
Remo vethe tyre sealant bottle from the tyre
in0ation compressor. #
Insert the /ller hose in the soc ket of the tyre
in0ation compressor and turn it a quarter turn
clockwise. #
Press pressure release button Cnext to
manome terB.
When t When t he tyr he tyre pr
e pressur
essur e is corr
e is corr ect
ect #
Unscr ewthe /lling hose from theva lve of the
sealed tyre. #
Screw theva lve cap onto theva lve of the
sealed tyre. #
Stow the tyre sealant bottle and the tyre in0a-
tion compressor. #
Drive tothe nearest quali/ed specialist work-
shop and ha vethe tyre, tyre sealant bottle and
/lling hose replaced there. 360
360
Breakdown assistance

T
T
o
o wing ey
wing eye st
e st or
orag
ag e location
e location The
towing eye is under the load compartment
0oor. F
F
itting and r
itting and r emo
emo ving t
ving t heto
he towing eye
wing eye #
Press the mark on co ver1 inwa rds and
re mo ve. #
Screw intheto wing eye clockwise as far as it
will go and tighten.
V
V ehicles wit
ehicles wit h a tr
h a trailer hitc
ailer hitc h:
h:vehicles with a trailer
hitch do not ha veare ar brac ketfo rth eto wing
ey e. Fasten theto w bar tothe trailer hitch. #
Make sure that co ver1 engages in the
bumper when youre mo vetheto wing eye.
* N
NOOTE
TE Damage totheve hicle due toincor-
re ct use of theto wing eye or trailer hitch When a
towing eye or trailer hitch is used to
re co ver a vehicle, theve hicle may be damaged
in the process. #
Only use theto wing eye or trailer hitch to
to w awa y or tow start theve hicle. #
Do not use theto wing eye or trailer hitch
to to wtheve hicle during reco very. T
T
o
o w
w -st
-st ar
arting t
ting t he v
he vehicle
ehicle V V
ehicles wit ehicles wit h aut
h automatic tr
omatic tr ansmission
ansmission
* NO
NOTE
TE Damage tothe automatic transmis-
sion due to tow-starting The au
tomatic transmission may be damaged
in the process of tow- starting vehicles with
automatic transmission. #
Vehicles with automatic transmission
must not be tow- star ted. #
Vehicles with an automatic transmission must
not be tow- star ted.
V V ehicles wit ehicles wit h manual tr
h manual tr ansmission
ansmission #
Obser vethe no tes on towing away
( / page 367). #
If necessar y,allow the engine and exhaust
system tocool down. #
Swit chon the ignition. #
Engage second gear. #
Release the electric parking brake. 370
370
Breakdown assistance