2023 MERCEDES-BENZ C CLASS Owners Manual

detected by the vehicle system self-diagnosis, thesystem transmits recommendations for action to
the Mercedes-Benz customer center depending on the fault detected. The customer center trans-mits the data to the service partner that you haveentered on the Mercedes me website at: http://www.mercedes.me.
For selected faults, the notiNcation that a mal-
function has been detected may appear in the multimedia system with a request to contact the
Mercedes-Benz customer center. From this mes- sage, a call can be made directly to the customer
center for assistance.\bThe transmission of a notiNcation to the multi-
media system depends on the country, vehi- cle model and equipment and requires a fast
data connection, over which the service pro-
vider has no inOuence.\bReliable fault detection is subject to technical
limitations. Therefore, only a limited selection
of faults can be detected and recommenda- tions for action transmitted to the customer
center and the service partners. Mercedes- Benz AG is continuously working on theexpansion of this service. The fault detectiondepends on the country, vehicle model andequipment.
Data transferred when using Telediagnostics
When the service is activated, relevant data is
automatically transferred to determine the
required scope of maintenance as well as mal-
function detection and malfunction rectiNcation.
Details on data transfer can be found in the data protection information for the Mercedes me con-
nect services. These can be found at: http://
www.mercedes.me under "My Mercedes me
account", "Terms of use".
\bThe scope of the data transmitted depends on
the vehicle model and equipment. For techni-
cal reasons, not all data is available at all
times.Engine compartment
Opening and closing the hood
&WARNING Risk of accident due to driving
with the hood unlocked
The hood may open and block your view.
Never release the hood when driving.Before every trip, ensure that the hood is
locked.&WARNING Risk of accident and injury
when opening and closing the hood
The hood may suddenly drop into the end position.
There is a risk of injury for anyone in the
hood\bs range of movement.
Do not open or close the hood if there is a person in the hood\bs range of move-
ment.Maintenance and care303

&WARNING Risk of burns when opening the
hood
If you open the hood in the event of an over- heated engine or Nre in the engine compart-
ment, the following situations may occur:
= You may come into contact with hot gases.
= You may come into contact with other
escaping hot operating Ouids.
Before opening the hood, allow the
engine to cool down.In the event of a Nre in the engine com-
partment, keep the hood closed and call
the Nre service.&WARNING Risk of injury due to moving
parts
Components in the engine compartment may continue to run or start unexpectedly even
when the drive system is switched oM.
Observe the following if you must open the
hood:
Switch oM the vehicle.Never touch the danger zones surround-
ing moving components, e.g. the rotation
area of the fan.Remove jewelery and watches.Keep items of clothing and hair away from moving parts.&WARNING Risk of injury from touching live
components
The ignition system and the fuel injection sys- tem operate with a high voltage. You could
receive an electric shock.
Never touch components of the ignition
system or fuel injection system when the vehicle is switched on.The live components include the following, for
example:
= Ignition coils
= Fuel injectors=Electric lines to the ignition coils and the fuel
injectors&WARNING Risk of burns from hot compo-
nent parts in the engine compartment
Certain component parts in the engine com-
partment can be very hot, e.g. the engine, the
cooler and parts of the exhaust system.
Allow the engine to cool down and only
touch component parts described in the
following.&WARNING Risk of injury from using the
windshield wipers when the hood is open
If the windshield wipers start moving when the
hood is open, you could be trapped by the wiper linkage.
Always switch oM the windshield wipers
and the vehicle Nrst if you need to open
the hood.304Maintenance and care

Opening the hoodTo release the hood, pull on handle 1.Push handle 2 of the hood catch upwards
and lis the hood until it opens automatically.
Closing the hood
*NOTE Damage to the hood
If the hood is closed manually, there is a risk
of dents.
Do not close the hood manually.Lower the hood to a height of around 8 in
(20 cm) and then allow it to fall, applying a lit-
tle force as you let it go.If the hood can still be lised slightly, open the
hood again and close it with a little more force
until it engages correctly.
Engine oil

q Checking the engine oil level using the driver\bs
display
Requirements
= The engine has been warmed up.
= The vehicle is parked on a level surface.
= The engine is running at idle speed.
= The hood is closed.
Determining the engine oil level can take up to
30 minutes with a normal driving style and even longer with an active driving style.
Driver\bs display: 4 Service
The engine oil level is shown.
Maintenance and care305

One of the following messages will appear on thedriver\bs display:
= Engine Oil Level Measuring Now

*NOTE Damage caused by reNlling too
much engine oil
Too much engine oil can damage the engine or
the catalytic converter.
Have excess engine oil removed at a
qualiNed specialist workshop.\bDepending on driving style, the vehicle con-
sumes up to 0.9 US qt (0.8 liters) of oil per 600 miles (1,000 km). The oil consumptionmay also be higher than this when the vehicle
is new or if you frequently drive at high engine
speeds.Turn cap 1 counter-clockwise and remove it.Add engine oil.Replace cap 1 and turn it clockwise until it
engages.Check the oil level again (  page 305).Checking the coolant level&WARNING Risk of burns from hot compo-
nent parts in the engine compartment
Certain component parts in the engine com-
partment can be very hot, e.g. the engine, the
cooler and parts of the exhaust system.
Allow the engine to cool down and only
touch component parts described in the
following.&WARNING Risk of scalding from hot cool-
ant
If you open the cap, you could be scalded.
Let the motor cool down before opening
the cap.When opening the cap, wear protective
gloves and safety glasses.Open the cap slowly to release pressure.Maintenance and care307

Park the vehicle on a level surface.Check the coolant temperature display on thedriver\bs display.
The coolant temperature must be in the bot-
tom quarter of the temperature indicator.Slowly turn cap 1 counter-clockwise to
release overpressure.Continue turning cap 1 counter-clockwise
and remove it.
The coolant level is correct in the following cases:
= If the engine is cold, the coolant is up to
marker bar 2.
= If the engine is warm, the coolant is up to
0.6 in (1.5 cm) over marker bar 2.
If necessary, reNll with coolant that has been
approved for Mercedes-Benz.\bFurther information on coolant (  page 378)
ReNlling the windshield washer system
&WARNING Risk of injury due to moving
parts
Components in the engine compartment may continue to run or start unexpectedly even
when the drive system is switched oM.
Observe the following if you must open the
hood:
Switch oM the vehicle.Never touch the danger zones surround-
ing moving components, e.g. the rotation
area of the fan.Remove jewelery and watches.Keep items of clothing and hair away from moving parts.&WARNING Risk of burns from hot compo-
nent parts in the engine compartment
Certain component parts in the engine com-
partment can be very hot, e.g. the engine, the
cooler and parts of the exhaust system.
Allow the engine to cool down and only
touch component parts described in the
following.&WARNING !

Make sure that no windshield washer
concentrate spills out next to the Nller
opening.Open cap 1 by the tab.Add washer Ouid.\bFurther information about the windshield
washer Ouid ( page 379)Keeping the air/water duct freeKeep the area between the hood and the
windshield free of deposits, e.g. ice, snow or
leaves.
Cleaning and care
Information on washing the vehicle in a car wash
&WARNING Risk of accident due to
reduced braking eMect aser washing the
vehicle
The braking eMect is reduced aser washing
the vehicle.
Aser the vehicle has been washed, brake
carefully while paying attention to the
traPc conditions until the braking eMect
has been fully restored.*NOTE Damage from automatic braking
If one of the following functions is activated,
the vehicle will brake automatically in certain
situations:
= Active Brake Assist
= Active Distance Assist DISTRONIC
= HOLD function
= Active Parking Assist
To avoid damage to the vehicle, deactivate
these systems in the following or similar situa-
tions:
During towing.In a car wash.*NOTE Damage due to unsuitable car washBefore driving into a car wash make sure
that the car wash is suitable for the vehi-
cle dimensions.Maintenance and care309

Ensure there is suPcient ground clear-
ance between the underbody and the guide rails of the car wash.Ensure that the clearance width of the
car wash, in particular the width of the
guide rails, is suPcient.
To avoid damage to your vehicle when using a car
wash, ensure the following beforehand:
= Active Distance Assist DISTRONIC is deactiva-
ted.
= The HOLD function is switched oM.
= The 360° camera or the reversing camera is
switched oM.
= The side windows and sliding sunroof are com-
pletely closed.
= The outside mirrors are folded in.
= The blower for the ventilation and heating is
switched oM.
= The windshield wiper switch is in position Z.
= The key is at a minimum distance of 10 s
(3 m) away from the vehicle. Otherwise, the trunk lid could open unintentionally.
= For car washes with a conveyor system:
- Neutral \\ is engaged.
- If you would like to leave the vehicle while
it is being washed, make sure the key islocated in the vehicle. Park position ]
will otherwise be engaged automatically.\bIf, aser the car wash, you remove the wax
from the windshield and wiper rubbers, this
will prevent smearing and reduce wiper noise.
Automatic car wash mode
In car wash mode, the vehicle is prepared for driv-
ing into an automatic car wash. Car wash mode
can be activated at a speed of up to 12 mph
(20 km/h) (  page 311).
When car wash mode is activated, the Automatic
Car Wash Mode Active message will appear on
the driver\bs display. The following adjustments will
be made:
= The outside mirrors will be folded in.
= To prevent the windshield washer system from
starting up automatically, the rain sensor will
be deactivated.
= Parking Assist PARKTRONIC will be deactiva-
ted.
= Vehicles with 360° camera: the front image
will be activated aser approximately eight sec-
onds.
= Vehicles with HANDS-FREE ACCESS: kick rec-
ognition will be deactivated.
If one of the settings cannot be selected, this will be shown by the symbol next to the respec-
tive setting.
Pressing Switch Off will cancel car wash mode.
Above a speed of 12 mph (20 km/h), car wash mode will be deactivated automatically.
You can also switch oM car wash mode via the
MBUX multimedia system (  page 311).
The following settings will be reset when car wash
mode is deactivated:
= The outside mirrors will be folded out.
= The rain sensor will be activated.
= Parking Assist PARKTRONIC will be reset to
the previously selected setting.310Maintenance and care