Get Maintenance and care -> Engine compartment Guide for Mercedes C Class 4 Door 2023

Maintenance and care

610

The vehicle can detect if certain wear parts need

to be replaced or if malfunctions have occurred in

vehicle systems. If the Telediagnostics service is

activated, relevant data is automatically transmit-

ted to the manufacturer. If fault conditions are

detected by the vehicle system self-diagnosis, the

system transmits recommendations for action to

the Mercedes-Benz customer centre depending

on the fault detected. The customer centre trans-

mits the data to the service partner that you have

entered on the Mercedes me website at: http://

www.mercedes.me.

For selected faults, the notiﬁcation that a mal-

function has been detected may appear in the

multimedia system with a request to contact the

Mercedes-Benz Customer Centre. From this mes-

sage, a call can be made directly to the customer

centre for assistance.

of faults can be detected and recommenda-

tions for action transmitted to the customer

centre and the service partners. Mercedes-

Benz AG is continuously working on the

expansion of this service. The fault detection

depends on the country, vehicle model and

equipment.

Engine compartment

Active bonnet (pedestrian protection)

▌Operation of the active bonnet (pedestrian pro-

tection)

In certain accident situations, the actuation of the

active bonnet reduces the risk of injury to pedes-

trians. The rear area of the bonnet is raised by

approximately 75 mm.

Aꢀer being triggered, the active bonnet remains in

the raised position. Limited visibility due to the

raised bonnet cannot be ruled out.

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 fault

detection and fault rectiﬁcation.

Details on data transfer can be found in the data

protection information for the Mercedes me con-

nect services. These can be found at: https://

www.mercedes.me under "My Mercedes me

account", "Terms of use".

Aꢀer the active bonnet has been actuated, pedes-

trian protection may be limited.

Have the full functionality of the active bonnet

restored immediately in a qualiﬁed specialist

workshop.

If necessary, adjust your seat position and drive

carefully to a qualiﬁed specialist workshop. If a

safe continued journey is not possible, contact a

qualiﬁed specialist workshop.

The transmission of a notiﬁcation 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 inﬂuence.

The scope of the data transmitted depends on

the vehicle model and equipment. For techni-

cal reasons, not all data is available at all

times.

Reliable fault detection is subject to technical

limitations. Therefore, only a limited selection

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Maintenance and care

611

Opening and closing the bonnet

There is a risk of injury for anyone in the

engine bonnet's range of movement.

WARNING Risk of injury due to moving

parts

DANGER Risk of fatal injuries when carry-

ing out maintenance work during the

charging process

Do not open or close the bonnet if there

Components in the engine compartment may

continue to run or start unexpectedly even

when the drive system is switched oﬀ.

Observe the following if you must open the

bonnet:

is a person in the bonnet's range of

movement.

During the charging process, the high-voltage

on-board electrical system is under high volt-

age.

WARNING Risk of burns when opening the

bonnet

Switch oﬀ the vehicle.

Never touch the danger zones surround-

ing moving components, e.g. the rotation

area of the fan.

Remove jewellery and watches.

Do not perform any maintenance work

during the charging process.

If you open the bonnet in the event of an over-

heated engine or ﬁre in the engine compart-

ment, the following situations may occur:

WARNING Risk of accident due to driving

with the bonnet unlocked

You may come into contact with hot gases.

You may come into contact with other

escaping hot operating ﬂuids.

Keep items of clothing and hair away

from moving parts.

The bonnet may open and block your view.

Never release the bonnet when driving.

Before opening the bonnet, allow the

engine to cool down.

Before every trip, ensure that the engine

bonnet is locked.

WARNING Risk of injury from touching

components under voltage

In the event of a ﬁre in the engine com-

partment, keep the bonnet closed and

The ignition system and the fuel injection sys-

tem operate at high voltage. You could receive

an electric shock.

WARNING Risk of accident and injury

when opening and closing the bonnet

call the ﬁre service.

The bonnet may suddenly drop into the end

position.

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Maintenance and care

612

Opening the bonnet

Never touch ignition system or fuel injec-

tion system components when the vehi-

cle is switched on.

WARNING Risk of injury from using the

windscreen wipers when the bonnet is

open

If the windscreen wipers start moving when

the bonnet is open, you could be trapped by

the wiper linkage.

The live components include the following, for

example:

Ignition coils

Always switch oﬀ the windscreen wipers

and the vehicle ﬁrst if you need to open

Fuel injectors

the bonnet.

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.

To release the bonnet, pull on handle 1.

Allow the engine to cool down and only

touch component parts described in the

following.

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Maintenance and care

613

Driver's display:

Do not close the bonnet manually.

Service

Lower the bonnet to a height of around 20 cm

and then allow it to fall, applying a little force

as you let it go.

If the bonnet can still be liꢀed slightly, open

the bonnet again and close it with a little more

force until it engages correctly.

The engine oil level is shown.

One of the following messages will appear on the

driver's display:

Engine oil level Measuring now…: the engine

oil level cannot be determined yet.

Repeat the request aꢀer a maximum of

30 minutes' driving.

Engine oil

Engine oil level OK and the bar display for

▌Checking the engine oil level using the driver's

display

indicating the engine oil level on the driver's

display is green and is between "min" and

"max": the engine oil level is correct.

Requirements

The engine has been warmed up.

Engine oil level Top up 1,0 l and the bar dis-

play for indicating the engine oil level on the

driver's display is yellow and is below "min":

Push handle 2 of the bonnet catch upwards

and liꢀ the bonnet until it opens automatically.

The vehicle is parked on a level surface.

The engine is running at idle speed.

Closing the bonnet

The bonnet is closed.

Add 1 l of engine oil.

Engine oil level Reduce and the bar display for

indicating the engine oil level on the driver's

display is yellow and is above "max":

NOTE Damage to the bonnet due to man-

ual closing

Determining the engine oil level can take up to

30 minutes with a normal driving style and even

longer with an active driving style.

If the bonnet is closed manually, there is a risk

of dents.

F206 0105 02

Maintenance and care

614

Drain oﬀ any excess engine oil that has been

added. To do so, consult a qualiﬁed specialist

workshop.

Switch oﬀ the vehicle.

WARNING Risk of burns when opening the

bonnet

Never touch the danger zones surround-

ing moving components, e.g. the rotation

area of the fan.

Remove jewellery and watches.

Keep items of clothing and hair away

from moving parts.

If you open the bonnet in the event of an over-

heated engine or ﬁre in the engine compart-

ment, the following situations may occur:

For engine oil level, switch on vehicle

Switch on the vehicle to check the engine oil

level.

Engine oil level System inoperative: The oil

level sensor is defective or not connected.

You may come into contact with hot gases.

You may come into contact with other

escaping hot operating ﬂuids.

WARNING Risk of burns from hot compo-

nent parts in the engine compartment

Consult a qualiﬁed specialist workshop.

Engine oil level System currently inoperative

Before opening the bonnet, allow the

engine to cool down.

Certain component parts in the engine com-

partment can be very hot, e.g. the engine, the

cooler and parts of the exhaust system.

In the event of a ﬁre in the engine com-

Close the bonnet.

partment, keep the bonnet closed and

▌Topping up engine oil

call the ﬁre service.

Allow the engine to cool down and only

touch component parts described in the

following.

DANGER Risk of fatal injuries when carry-

ing out maintenance work during the

charging process

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 oﬀ.

Observe the following if you must open the

bonnet:

WARNING Risk of ﬁre and injury from

engine oil

During the charging process, the high-voltage

on-board electrical system is under high volt-

age.

If engine oil comes into contact with hot com-

ponent parts in the engine compartment, it

may ignite.

Do not perform any maintenance work

during the charging process.

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Maintenance and care

615

Turn cap 1 anti-clockwise and remove it.

Top up the engine oil.

Replace cap 1 and turn it clockwise until it

engages.

Make sure that no engine oil is spilled

Have excess engine oil removed at a

next to the ﬁller opening.

qualiﬁed specialist workshop.

Allow the engine to cool oﬀ and thor-

oughly clean the engine oil from compo-

nent parts before starting the vehicle.

Depending on driving style, the vehicle con-

sumes up to 0.8 litres of oil per 1000 km. The

oil consumption may also be higher than this

when the vehicle is new or if you frequently

drive at high engine speeds.

Check the oil level again (/ page 32).

NOTE Engine damage caused by an incor-

rect oil ﬁlter, incorrect oil or additives

Checking the coolant level

Do not use engine oils or oil ﬁlters which

do not correspond to the speciﬁcations

explicitly prescribed for the service inter-

vals.

Follow the instructions on the service

interval display for changing the engine

oil and observe the prescribed change

intervals.

DANGER Risk of fatal injuries when carry-

ing out maintenance work during the

charging process

During the charging process, the high-voltage

on-board electrical system is under high volt-

age.

Do not perform any maintenance work

during the charging process.

Do not use additives.

NOTE Damage caused by topping up too

much engine oil

Excess engine oil can damage the engine or

catalytic converter.

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Maintenance and care

616

Switch oﬀ the vehicle.

Let the motor cool down before opening

the cap.

When opening the cap, wear protective

gloves and safety glasses.

WARNING Risk of burns when opening the

bonnet

Never touch the danger zones surround-

ing moving components, e.g. the rotation

area of the fan.

Remove jewellery and watches.

Keep items of clothing and hair away

from moving parts.

If you open the bonnet in the event of an over-

heated engine or ﬁre in the engine compart-

ment, the following situations may occur:

Open the cap slowly to release pressure.

You may come into contact with hot gases.

You may come into contact with other

escaping hot operating ﬂuids.

WARNING Risk of burns from hot compo-

nent parts in the engine compartment

Before opening the bonnet, allow the

engine to cool down.

Certain component parts in the engine com-

partment can be very hot, e.g. the engine, the

cooler and parts of the exhaust system.

In the event of a ﬁre in the engine com-

partment, keep the bonnet closed and

call the ﬁre service.

Allow the engine to cool down and only

touch component parts described in the

following.

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 oﬀ.

Observe the following if you must open the

bonnet:

WARNING Risk of scalding from hot cool-

ant

If you open the cap, you could be scalded.

Park the vehicle on a level surface.

F206 0105 02

Maintenance and care

617

Check the coolant temperature display on the

driver's display.

Topping up the windscreen washer system

In the event of a ﬁre in the engine com-

partment, keep the bonnet closed and

call the ﬁre service.

The coolant temperature must be below 70°C.

DANGER Risk of fatal injuries when carry-

ing out maintenance work during the

charging process

Slowly turn cap 1 anti-clockwise to release

overpressure.

Continue turning cap 1 anti-clockwise and

remove it.

WARNING Risk of injury due to moving

parts

During the charging process, the high-voltage

on-board electrical system is under high volt-

age.

Components in the engine compartment may

continue to run or start unexpectedly even

when the drive system is switched oﬀ.

Observe the following if you must open the

bonnet:

The coolant level is correct in the following cases:

Do not perform any maintenance work

during the charging process.

If the engine is cold, the coolant is up to

marker bar 2.

If the engine is warm, the coolant is up to

1.5 cm over the marker bar 2.

WARNING Risk of burns when opening the

bonnet

Switch oﬀ the vehicle.

Never touch the danger zones surround-

ing moving components, e.g. the rotation

area of the fan.

Remove jewellery and watches.

If necessary, reﬁll with coolant that has been

approved for Mercedes-Benz.

If you open the bonnet in the event of an over-

heated engine or ﬁre in the engine compart-

ment, the following situations may occur:

You may come into contact with hot gases.

Keep items of clothing and hair away

from moving parts.

You may come into contact with other

escaping hot operating ﬂuids.

Before opening the bonnet, allow the

engine to cool down.

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Maintenance and care

618

Cleaning and care

Information on washing the vehicle in a car wash

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.

WARNING Risk of an accident due to

reduced braking power aꢀer washing the

vehicle

Allow the engine to cool down and only

Braking eﬃciency is reduced aꢀer washing the

vehicle.

touch component parts described in the

following.

Aꢀer the vehicle has been washed, brake

carefully while paying attention to the

traﬃc conditions until braking power has

been fully restored.

WARNING ‑ Risk of ﬁre and injury due to

windscreen washer concentrate

Windscreen washer concentrate is highly ﬂam-

mable. It could ignite if it comes into contact

with hot engine component parts or the

exhaust system.

NOTE Damage from automatic braking

Open cap 1 by the tab.

Top up the washer ﬂuid.

If one of the following functions is activated,

the vehicle will brake automatically in certain

situations:

Make sure that no windscreen washer

concentrate spills out next to the ﬁller

opening.

Active Brake Assist

Active Distance Assist DISTRONIC

HOLD function

Active Parking Assist

Keeping the air/water duct free

Keep the area between the bonnet and the

windscreen free of deposits, e.g. ice, snow or

leaves.

F206 0105 02

Maintenance and care -> Engine compartment for Your Mercedes C Class 4 Door 2023

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