MERCEDES-BENZ C CLASS 2023 Owners Manual

overhead control panel in the case of a break-
down (  page 283).
= All vehicles: change the wheel (  page 362).\bThe emergency spare wheel is available only
in certain countries.
Notes on MOExtended tires (run-Oat tires)
&WARNING Risk of accident when driving in
limp-home mode
When driving in emergency mode the handling
characteristics are impaired.
Do not exceed the speciNed maximum
speed of the MOExtended tires.Avoid any abrupt steering and driving maneuvers as well as driving over obsta-
cles (curbs, pot holes, oM-road). This
applies, in particular, to a loaded vehicle.Stop driving in the emergency mode if
you notice:
= Banging noise
=
Vehicle vibration
= Smoke which smells like rubber
= Continuous ESP n
intervention
= Cracks in the tire side wallsAser driving in emergency mode, have
the rims checked by a qualiNed specialist
workshop with regard to their further
use.The defective tire must be replaced in
every case.
With MOExtended tires (run-Oat tires), you can
continue to drive your vehicle even if there is a
total loss of pressure in one or more tires. How-
ever, the aMected tire must not show signs of
clearly visible damage.
You can recognize MOExtended tires by the
MOExtended marking which appears on the side wall of the tire.
Vehicles with a tire pressure loss warning system: MOExtended tires may only be used in conjunc-
tion with an activated tire pressure loss warning
system.
Vehicles with a tire pressure monitoring system:
MOExtended tires may only be used in conjunc-
tion with an activated tire pressure monitoring system.
If a pressure loss warning message appears in the driver\bs display, proceed as follows:
= Check the tire for damage.
= If driving on, observe the following notes.
Driving distance possible in emergency mode aser the pressure loss warning:Load conditionDriving distance possi-
ble in emergency modePartially laden50 miles (80 km)Fully laden19 miles (30 km)
The driving distance possible in emergency mode
may vary depending on the driving style. Observe the maximum permissible speed of 50 mph
(80 km/h).
If a tire has gone Oat and cannot be replaced with
an MOExtended tire, you can use a standard tire
as a temporary measure.
Breakdown assistance319

TIREFIT kit storage location
Plug-in hybrid
TIREFIT kit 1 is located on the les-hand side of
the load compartment as delivered.
Not plug-in hybrid
TIREFIT kit 1 is located on the les-hand side of
the load compartment as delivered.
Depending on the model, the TIREFIT kit may be
located in other places in the trunk.
\bDepending on the tire class, the tire inOation
compressor weighs as follows:
= Tire class 1 !

&WARNING Risk of accident when using
tire sealant
The tire sealant may be unable to seal the tire
properly, especially in the following cases:
= There are large cuts or punctures in the
tire (larger than damage previously men-
tioned)
= The wheel rims have been damaged
= Aser journeys with very low tire pressure
or with Oat tires
Do not continue driving.Consult a qualiNed specialist workshop.&WARNING Risk of injury and poisoning
from tire sealant
The tire sealant is harmful and causes irrita-
tion. Do not allow it to come into contact with
the skin, eyes or clothing, and do not swallow it. Do not inhale tire sealant fumes. Keep the
tire sealant away from children.
If you come into contact with the tire sealant,
observe the following:Rinse oM the tire sealant from your skin
immediately using water.If tire sealant gets into your eyes, thor- oughly rinse out the eyes using clean
water.If tire sealant has been swallowed, imme-
diately rinse out the mouth thoroughly
and drink plenty of water. Do not induce
vomiting and seek medical attention
immediately.Change out of any clothes contaminated
with tire sealant immediately.If allergic reactions occur, seek medical
attention immediately.*NOTE Overheating due to the tire inOation
compressor running too longDo not run the tire inOation compressor
for longer than ten minutes without inter- ruption.Comply with the manufacturer\bs safety notes on
the sticker on the tire inOation compressor.
Have the tire sealant bottle replaced at a qualiNed
specialist workshop every Nve years.Do not remove any foreign objects that have
entered the tire.APx part 1 of the TIREFIT sticker to the
instrument cluster within the driver\bs Neld of
vision.APx part 2 of the TIREFIT sticker near the
valve on the wheel with the defective tire.Breakdown assistance321

Pull plug 4 with the cable and hose 5 out
of the tire inOation compressor housing.Push the plug of hose 5 into Oange 6 of tire
sealant bottle 1 until the plug engages.Place tire sealant bottle 1 head downwards
into recess 2 of the tire inOation compressor.Remove the valve cap from valve 7 on the
faulty tire.Screw Nlling hose 8 onto valve 7.Insert plug 4 into a 12 V socket in your vehi-
cle.Switch on the vehicle.Press on and oM switch 3 on the tire inOation
compressor.
The tire inOation compressor is switched on.
The tire is inOated. First, tire sealant is pum-
ped into the tire. The pressure may brieOy rise
to approximately 500 kPa (5 bar/73 psi).Do not switch oM the tire inOation compressor
during this phase!Let the tire inOation compressor run for a max-
imum of ten minutes.
The tire should then have attained a tire pres-
sure of at least 200 kPa (2.0 bar/29 psi).
If tire sealant leaks out, make sure you clean the
aMected area as quickly as possible. It is prefera-
ble to use clean water.
If you get tire sealant on your clothing, have it cleaned as soon as possible with perchloroethy- lene.
If, aser ten minutes, a tire pressure of 200 kPa
(2.0 bar/29 psi) has not been attained:
Switch oM the tire inOation compressor.Unscrew the Nlling hose from the valve of the
defective tire.
Please note that tire sealant may leak out when
you unscrew the Nlling hose.
Drive forwards or in reverse very slowly for
approximately 33 s (10 m).322Breakdown assistance

Pump up the tire again.
Aser a maximum of ten minutes, the tire pres-
sure must be at least 200 kPa (2.0 bar/
29 psi).&WARNING Risk of accident due to the
speciNed tire pressure not being achieved
If the speciNed tire pressure is not achieved
aser the speciNed time, the tire is too badly
damaged. The tire sealant cannot repair the
tire in this instance.
The braking characteristics as well as the driv- ing characteristics may be greatly impaired.
Do not continue driving.Consult a qualiNed specialist workshop.
If, aser ten minutes, a tire pressure of 200 kPa
(2.0 bar/29 psi) has been attained:
&WARNING Risk of accident from driving
with sealed tires
A tire temporarily sealed with tire sealant
impairs the handling characteristics and is not suitable for higher speeds.
Adapt your driving style accordingly and
drive carefully.Do not exceed the maximum speed limit with a tire that has been repaired using
tire sealant.Observe the maximum permissible speed of
50 mph (80 km/h) for a tire sealed with tire
sealant.APx the upper section of the TIREFIT sticker
to the instrument cluster in a location where it
will be easily seen by the driver.*NOTE Staining caused by leaking tire seal-
ant
Aser use, excess tire sealant may leak out
from the Nlling hose.
Therefore, place the Nlling hose in the
plastic bag that contained the TIREFIT
kit.+ENVIRONMENTAL NOTE Environmental
pollution caused by environmentally irre-
sponsible disposal
Tire sealant contains pollutants.
Have the tire sealant bottle disposed of
professionally, e.g. at an authorized
Mercedes-Benz Center.Switch oM the tire inOation compressor.Unscrew the Nlling hose from the valve of the
defective tire.Stow the tire sealant bottle and the tire inOa-
tion compressor.Pull away immediately.Stop driving aser approximately ten minutes
and check the tire pressure using the tire
inOation compressor.
The tire pressure must now be at least
130 kPa (1.3 bar/19 psi).Breakdown assistance323

&WARNING Risk of accident due to the
speciNed tire pressure not being attained
If the speciNed tire pressure is not reached,
the tire is too badly damaged. The tire sealant
cannot repair the tire in this instance.
The braking and driving characteristics may begreatly impaired.
Do not continue driving.Consult a qualiNed specialist workshop.
In cases such as the one mentioned above, con-
tact an authorized Mercedes-Benz Center. Or call1-800-FOR-MERCedes (in the USA) or
1-800-387-0100 (in Canada).
Correct the tire pressure if it is still at least
130 kPa (1.3 bar/19 psi). See the Tire and
Loading Information placard on the B!

Battery (vehicle)
Notes on the 12 V battery
&WARNING Risk of an accident due to work
carried out incorrectly on the battery
Work carried out incorrectly on the battery
can, for example, lead to a short circuit. This can restrict functions relevant for safety sys-
tems and impair the operating safety of your
vehicle.
You could lose control of the vehicle in the fol-
lowing situations in particular:
= When braking
= In the event of abrupt steering maneuvers
and/or when the vehicle\bs speed is not
adapted to the road conditions
In the event of a short circuit or a similar incident, contact a qualiNed specialist
workshop immediately.Do not drive on.Always have work on the battery carried
out at a qualiNed specialist workshop.=
Further information on ABS (  page 181)
= Further information on ESP n
( page 182)
For safety reasons, Mercedes-Benz recommends that you only use batteries which have been
approved for your vehicle by Mercedes-Benz.
All vehicles except vehicles with a lithium-ion bat- tery&WARNING Risk of explosion due to elec-
trostatic charge
Electrostatic charge can ignite the highly
explosive gas mixture in the battery.
To discharge any electrostatic charge
that may have built up, touch the metal
vehicle body before handling the battery.
The highly Oammable gas mixture is created while
the battery is charging and during starting assis-
tance.
&WARNING Danger of chemical burns from
the battery acid
Battery acid is caustic.
Avoid contact with the skin, eyes or
clothing.Do not lean over the battery.Do not inhale battery gases.Keep children away from the battery.Immediately rinse battery acid oM thor-
oughly with plenty of clean water and
seek medical attention immediately.
All vehicles
+ENVIRONMENTAL NOTE Environmental
damage due to improper disposal of bat- teries
Batteries contain pollutants. It is
illegal to dispose of them with the household rubbish.
Breakdown assistance325


Dispose of batteries in an
environmentally responsible manner.
Take discharged batteries to a qualiNed
specialist workshop or to a collection
point for used batteries.
If you have to disconnect the 12 V battery, con- tact a qualiNed specialist workshop.
Comply with safety notes and take protective
measures when handling batteries.
Risk of explosion if the 12 V battery is
used improperly.Fire, open Oames and smoking are pro-
hibited when handling the battery. Avoid
creating sparks.Electrolyte or battery acid is corrosive.
Avoid contact with the skin, eyes or cloth-
ing. Wear suitable protective clothing, in
particular gloves, an apron and a face
mask. Immediately rinse electrolyte oracid splashes oM with clean water. Consult
a doctor immediately.Do not place heavy objects on the surface of the battery or use the battery to sup-port a person in any way.Wear safety glasses.Keep children away.Observe this Operator\bs Manual.
Observe the following if you do not intend to use
the vehicle over an extended period of time:
= Not plug-in hybrid: switch to standby mode.
Activating/deactivating standby mode (  page 178)
= Alternatively: connect the battery to a battery
charger approved by Mercedes-Benz or con-
sult a qualiNed specialist workshop to discon-
nect the battery.
Notes on the 48 V battery&WARNING Risk of an accident due to work
carried out incorrectly on the battery
Work carried out incorrectly on the battery
can, for example, lead to a short circuit. This can restrict functions relevant for safety sys-
tems and impair the operating safety of your
vehicle.
You could lose control of the vehicle in the fol-
lowing situations in particular:
= When braking
= In the event of abrupt steering maneuvers
and/or when the vehicle\bs speed is not
adapted to the road conditions
In the event of a short circuit or a similar incident, contact a qualiNed specialist
workshop immediately.Do not drive on.Always have work on the battery carried
out at a qualiNed specialist workshop.
=
Further information on ABS (  page 181)
326Breakdown assistance

=Further information on ESP n
( page 182)
For safety reasons, Mercedes-Benz recommends that you only use batteries that have been
approved for your vehicle by Mercedes-Benz.+ENVIRONMENTAL NOTE Environmental
damage due to improper disposal of bat-
teries
Batteries contain pollutants. It is
illegal to dispose of them with the household rubbish.

Dispose of batteries in an environ-
mentally responsible manner. Take dis-
charged batteries to a qualiNed specialist
workshop or to a collection point for
used batteries.
If you have to disconnect the 48 V battery, con- tact a qualiNed specialist workshop.
Comply with safety notes and take protective
measures when handling batteries.Risk of explosion if the 48 V battery is
used improperly.Fire, naked Oames and smoking are pro-
hibited when handling the battery. Avoid
creating sparks.Electrolyte or battery acid is corrosive.
Avoid contact with the skin, eyes or cloth-
ing. Wear suitable protective clothing, in
particular gloves, an apron and a face
mask. Immediately rinse oM splashes of
electrolyte or acid with plenty of clean water. Consult a doctor immediately.Do not place heavy objects on the surface of the battery or use the battery to sup-port a person in any way.Do not perform any work on the battery.
Always have any work on the battery car-
ried out at a qualiNed specialist workshop.
Do not disconnect the battery yourself. Do not remove the battery yourself. Do
not attempt to open the battery.Keep children away.Wear safety glasses.Observe this Operator\bs Manual.
Observe the following if you do not intend to use
the vehicle over an extended period of time:
= Not plug-in hybrid: switch to standby mode.
Activating/deactivating standby mode (  page 178)
Notes on starting assistance and charging the 12
V battery
All vehicles
When charging the battery and during starting
assistance, always use the jump-start connection
point in the engine compartment.
Breakdown assistance327

*NOTE Damage to the battery due to over-
voltage
When charging using a battery charger without
a maximum charging voltage, the battery or the on-board electronics may be damaged.
Only use battery chargers with a maxi-
mum charging voltage of 14.8 V.&WARNING Risk of explosion due to the
ignition of hydrogen gas
If there is a short circuit or sparks are created,
there is a danger of hydrogen gas igniting
when you charge the battery.
Make sure that the POSITIVE terminal of
a connected battery does not come into
contact with vehicle parts.Never place metal objects or tools on a
battery.When connecting and disconnecting the battery, always observe the sequence of
battery terminals described.During starting assistance, always take
care to connect only battery terminals of
identical polarity.During starting assistance, observe the sequence described for connecting and
disconnecting the jumper cables.Do not connect or disconnect the bat-
tery terminals with the engine running.&WARNING Risk of explosion due to a mix-
ture of explosive gases
A mixture of explosive gases can escape from
the battery during charging and jump starting.
Fire, open Oames, smoking and creating
sparks must be avoided.Make sure that there is suPcient ventila-
tion.Do not stand over the battery.&WARNING Risk of explosion from a frozen
battery
A discharged battery may freeze at tempera-
tures slightly above or below freezing point.
During starting assistance or battery charging,
battery gas can be released.
Always allow a battery to thaw before
charging it or performing starting assis-
tance.
If the indicator/warning lamps in the instrument cluster do not light up at low temperatures, it is
very likely that the discharged battery has frozen.
In this case you may neither jump-start the vehi- cle nor charge the battery.
The service life of a battery that has been thawedmay be dramatically shortened. The starting char-
acteristics may be impaired, especially at low
temperatures.
It is recommended that you have a thawed battery checked at a qualiNed specialist workshop.
328Breakdown assistance