Get Maintenance and care -> Engine compartment Guide for Mercedes CLA 4 Door Third Generation (2025-2026)

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 center depending

on the fault detected. The customer center trans-

mits the data to the service partner that you have

entered on the Mercedes me website at:

www..

For selected faults, the notication 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.

The transmission of a notication 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 inuence.

Reliable 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 the

expansion of this service. The fault detection

depends on the country, vehicle model and

equipment.

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 rectication.

Details on data transfer can be found in the data

protection information for the Mercedes me con-

nect services. These can be found at:

www. under "My Mercedes me

account", "Terms of use".

The scope of the transmitted data depends on

the vehicle model and its equipment. For

technical 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's range of movement.

Do not open or close the hood if there is

a person in the hood's range of move-

ment.

Maintenance and care

275

WARNING Risk of burns when opening the

hood

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

heated engine or re 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 uids.

Before opening the hood, allow the

engine to cool down.

In the event of a re in the engine com-

partment, keep the hood closed and call

the re 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 o.

Observe the following if you must open the

hood:

Switch o 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 o the windshield wipers

and the vehicle rst if you need to open

the hood.

276

Maintenance and care

Opening the hood

To release the hood, pull on handle 1.

Push yellow handle 2 on the hood catch to

the le as far as it will go (palm downwards).

Li the hood until it is automatically raised by

the pneumatic spring.

Closing the hood

Lower the bonnet and let it drop from a height

of approximately 8 in (20 cm).

If the hood can still be lied slightly, open the

hood again and close it with a little force until

it engages correctly.

Engine oil

▌Checking the engine oil level using the driver's

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's display:

Service

The engine oil level is shown.

Maintenance and care

277

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 aer a maximum of

30 minutes' driving.

Engine Oil Level OK and the bar display for

indicating the engine oil level on the driver's

display is green and is between "min" and

"max": the engine oil level is correct.

Engine Oil Level Refill 1,0 . and the bar

display for indicating the engine oil level on

the driver's display is yellow and is below

"min":

Add 1.1 US qt (1 l) of engine oil.

Engine Oil Level Reduce and the bar display

for indicating the engine oil level on the driv-

er's display is yellow and is above "max":

Drain o any excess engine oil that has been

added. To do so, consult a qualied specialist

workshop.

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.

Consult a qualied specialist workshop.

Engine Oil Level System Currently Unavaila-

ble

Close the hood.

▌Adding engine oil

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 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 to the ller opening.

Allow the engine to cool o and thor-

oughly clean the engine oil from compo-

nent parts before starting the vehicle.

NOTE Engine damage caused by an incor-

rect oil lter, incorrect oil or additives

Do not use engine oils or oil lters which

do not correspond to the specications

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.

Do not use additives.

278

Maintenance and care

NOTE Damage caused by adding too

much engine oil

Excessive engine oil can damage the engine or

the catalytic converter.

Have excess engine oil removed in a

qualied specialist workshop.

Depending 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 consumption

may 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 277).

Checking the coolant level

WARNING Risk of scalding from hot cool-

ant

If you open the cap, you could scald yourself.

Allow the engine to cool down before

opening the cap.

When opening the cap, wear protective

gloves and safety glasses.

Open the cap slowly to release pressure.

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.

Maintenance and care

279

Park the vehicle on a level surface.

Check the coolant temperature reading in the

driver display.

The coolant temperature must be in the bot-

tom quarter of the temperature display.

Slowly turn the cap 1 counter-clockwise to

release overpressure.

Continue turning the cap 1 counter-clock-

wise and remove it.

The coolant level is correct in the following cases:

if the engine is cold, the coolant is up to

marker bar

if the engine is warm, the coolant is up to

0.6 in (1.5 cm) over the marker bar

If necessary, add coolant that has been

approved for Mercedes-Benz.

Further information on coolant (/ page 354).

Relling the windshield washer system

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 re and injury from

windshield washer concentrate

Windshield washer concentrate is highly am-

mable. It could ignite if it comes into contact

with hot engine component parts or the

exhaust system.

Make sure that no windshield washer

concentrate spills out next to the ller

opening.

280

Maintenance and care

Remove cap 1 by the tab.

Add washer uid.

Further information about the windshield

washer uid (/ page 355).

Keeping the air/water duct free

Keep the area between the hood and the

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

leaves.

Checking the brake lining thickness

Bring the vehicle and wheels into a suitable

position so that you can position the gage.

Measuring point 3 for the test gage depends

on the equipment. The gage is positioned at

point

3, which is located either in the center

of the brake lining or at the upper end to the

side, depending on the brake caliper.

Switch o the vehicle.

Secure the vehicle against rolling away.

Take the gage out of the vehicle document

wallet in the glove compartment.

Place the test gage between the wheel spokes

at measuring point 3 on the brake lining.

Hold the gage vertically to brake disc 1 and

slide measuring pin

2 onto brake disc 1.

Check which color eld 4 the arrow on

measuring pin

2 is pointing to.

Green: the brake lining thickness is sucient.

Red: the brake lining thickness is not su-

cient. Have the brake linings checked at a

qualied specialist workshop.

Maintenance and care

281

Maintenance and care -> Engine compartment for Your Mercedes CLA 4 Door Third Generation (2025-2026)

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