2014 MERCEDES-BENZ CLA-Class maintenance

Useful information
i This Operator's manual describes all
models and all standard and optional equip- ment of your vehicle available at the time of
publication of the Operator's manual.
Country-specific differences are possible.
Please note that your vehicle may not be
equipped with all features described. This
also applies to safety-related systems and
functions.
i Read the information on qualified special-
ist workshops (Y page 26). Overview of climate control systems
Important safety notes
Observe the settings recommended on the
following pages. The windows could other-
wise fog up.
To prevent the windows from fogging up:
R switch off climate control only briefly
R switch on air-recirculation mode only
briefly
R switch on the cooling with air dehumidifi-
cation function
R switch on the defrost windshield function
briefly, if required
The climate control/dual-zone automatic
control regulates the temperature and the
humidity of the vehicle interior and filters out undesirable substances from the air.
Climate control/dual-zone automatic climate control is only operational when the engine is
running. Optimum operation is only achieved
with the side windows and panorama roof
with power tilt/sliding panel closed.
The residual heat function can only be acti-
vated or deactivated with the ignition
switched off (Y page 135).
Always keep the ventilation flaps behind the
side trim panel in the cargo compartment
clear (Y page 117). Otherwise the vehicle will
not be ventilated correctly. i
Ventilate the vehicle for a brief period
during warm weather, e.g. using the con-
venience opening feature (Y page 88). This
will speed up the cooling process and the
desired interior temperature will be
reached more quickly.
i The integrated filter filters out most par-
ticles of dust and soot and completely fil-
ters out pollen. With dual-zone automatic
climate control, gaseous pollutants and
odors will also be reduced. A clogged filter
reduces the amount of air supplied to the
vehicle interior. For this reason, you should always observe the interval for replacing
the filter, which is specified in the Mainte-
nance Booklet. As it depends on environ-
mental conditions, e.g. heavy air pollution,
the interval may be shorter than stated in
the Maintenance Booklet.
i It is possible that the residual heat func-
tion may be activated automatically an hour
after the SmartKey has been removed in
order to dry the air-conditioning system.
The vehicle is then ventilated for
30 minutes. 124
Overview of climate control systemsClimate control

Drive sensibly – save fuel
Observe the following tips to save fuel:
R The tires should always be inflated to the
recommended tire pressure.
R Remove unnecessary loads.
R Remove roof racks when they are not nee-
ded.
R Warm up the engine at low engine speeds.
R Avoid frequent acceleration or braking.
R Have all maintenance work carried out as
indicated by the service intervals in the
Maintenance Booklet or by the service
interval display.
Fuel consumption also increases when driv-
ing in cold weather, in stop-start traffic and in
hilly terrain.
Drinking and driving G
WARNING
Drinking and driving and/or taking drugs and driving are very dangerous combinations.
Even a small amount of alcohol or drugs can
affect your reflexes, perceptions and judg-
ment.
The possibility of a serious or even fatal acci-
dent is greatly increased when you drink or
take drugs and drive.
Do not drink or take drugs and drive or allow
anyone to drive who has been drinking or tak-
ing drugs.
Emission control G
WARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Inhaling
these exhaust gases leads to poisoning. There is a risk of fatal injury. Therefore never leave
the engine running in enclosed spaces with-
out sufficient ventilation.
Certain engine systems are designed to keep
the level of poisonous components in exhaust fumes within legal limits. These systems only work at peak efficiency if
they are serviced exactly in accordance with
the manufacturer's specifications. For this
reason, only have work on the engine carried
out by qualified and authorized Mercedes-
Benz technicians.
The engine settings must not be changed
under any circumstances. Furthermore, all
specific service work must be carried out at
regular intervals and in accordance with the
Mercedes-Benz service requirements. Details
can be found in the Maintenance Booklet. ECO display
The ECO display provides feedback on how
economical your driving characteristics are.
The ECO display assists you in achieving the
most economical driving style for the selec-
ted settings and prevailing conditions. Your
driving style can significantly influence the
vehicle's consumption. Example: ECO display
The ECO display consists of three bars:
R Acceleration
Acceleration
R Constant Constant
R Coasting
Coasting
The percent value is the average value of the three bars. The three bars and the mean value
begin at the value of 50%. A higher percent-
age indicates a more economical driving
style.
The ECO display does not indicate the actual fuel consumption. A fixed percentage count
in the ECO display does not indicate a fixed
consumption. Driving tips
161Driving and pa rking Z

Heavy and light loads
G
WARNING
If you rest your foot on the brake pedal while
driving, the braking system can overheat. This increases the stopping distance and can even
cause the braking system to fail. There is a
risk of an accident.
Never use the brake pedal as a footrest. Never
depress the brake pedal and the accelerator
pedal at the same time.
! Depressing the brake pedal constantly
results in excessive and premature wear to
the brake pads.
If the brakes have been subjected to a heavy load, do not stop the vehicle immediately.
Drive on for a short while. This allows the air-
flow to cool the brakes more quickly.
Wet roads If you have driven for a long time in heavy rain
without braking, there may be a delayed reac- tion from the brakes when braking for the firsttime. This may also occur after the vehicle has
been washed or driven through deep water.
You have to depress the brake pedal more
firmly. Maintain a greater distance from the
vehicle in front.
After driving on a wet road or having the vehi-
cle washed, brake firmly while paying atten-
tion to the traffic conditions. This will warm up the brake discs, thereby drying them more
quickly and protecting them against corro-
sion.
Limited braking performance on salt-
treated roads If you drive on salted roads, a layer of salt
residue may form on the brake discs and
brake pads. This can result in a significantly
longer braking distance. R
Brake occasionally to remove any possible
salt residue. Make sure that you do not
endanger other road users when doing so.
R Carefully depress the brake pedal and the
beginning and end of a journey.
R Maintain a greater distance to the vehicle
ahead.
Servicing the brakes !
If the red brake warning lamp lights up in
the instrument cluster and you hear a warn- ing tone while the engine is running, the
brake fluid level may be too low. Observe
additional warning messages in the multi-
function display.
The brake fluid level may be too low due tobrake pad wear or leaking brake lines.
Have the brake system checked immedi-
ately. This work should be carried out at a
qualified specialist workshop.
! A function or performance test should
only be carried out on a 2-axle dynamom-
eter. If you are planning to have the vehicle tested on such a dynamometer, contact an
authorized Mercedes-Benz Center to
obtain further information first. Otherwise,
you could damage the drive train or the
brake system.
! As the ESP ®
system operates automati-
cally, the engine and the ignition must be
switched off (the SmartKey must be in posi-
tion 0or 1in the ignition lock) if:
R the electric parking brake is tested on a
brake dynamometer (for a maximum of
ten seconds)
R the vehicle is towed with the front axle
raised.
Braking triggered automatically by ESP ®
may seriously damage the brake system.
All checks and maintenance work on the
brake system must be carried out at a quali-
fied specialist workshop. Consult a qualified
specialist workshop to arrange this. Driving tips
163Driving and parking Z

Maintenance menu
In the
Serv
Servmenu, you have the following
options:
R Calling up display messages in message
memory (Y page 213)
R Checking the tire pressure electronically
(Y page 321)
R Calling up the service due date
(Y page 286) Settings menu
Introduction In the
Sett Settmenu, you have the following
options:
R Changing the instrument cluster settings
R Changing the light settings
R Changing the vehicle settings
R Changing the convenience settings
R Restoring the factory settings Instrument cluster Selecting the unit of measurement for dis-
tance
You can determine whether the multifunction
display shows some messages in miles or
kilometers.
X Press the 0059or0065 button on the steer-
ing wheel to select the Sett Settmenu.
X Press the 0064or0063 button to select the
Instrument Cluster
Instrument Cluster submenu.
X Press 0076to confirm.
X Press the 0064or0063 button to select the
Display Unit Speed-/Odometer
Display Unit Speed-/Odometer func-
tion.
You will see the selected setting: km kmor
miles
miles.
X Press the 0076button to save the setting.
The selected unit of measurement for dis-
tance applies to: R the digital speedometer in the Trip Tripmenu
R the odometer and the trip odometer
R the trip computer
R the current consumption and the range
R navigation instructions in the Navi
Navimenu
R cruise control
R DISTRONIC PLUS
R ASSYST PLUS service interval display
Switching the additional speedometer
on/off
The Speedometer [km/h] Speedometer [km/h] orSpeedometer
Speedometer
[mph]
[mph] function allows you to choose whether
the multifunction display in the status area
always shows the speed in km/h
km/hor inmph
mph
instead of the outside temperature.
X Press the 0059or0065 button on the steer-
ing wheel to select the Sett
Settmenu.
X Press the 0064or0063 button to select the
Instrument Cluster
Instrument Cluster submenu.
X Press 0076to confirm. Menus and submenus
207On-board computer and displays Z

i
If the anti-theft alarm system is activated
for longer than 30 seconds, the Mercedes-
Benz Customer Assistance Center is auto-
matically notified.
Vehicle remote malfunction diagnosis With the vehicle remote malfunction diagno-
sis (Vehicle Health Check), the Customer
Assistance center can provide improved sup- port for problems with your vehicle. During anexisting call, vehicle data is transferred to the
Customer Assistance center. The customer
service representative can use the received
data to decide what kind of assistance is
required. You are then, for example, guided to the nearest authorized Mercedes-Benz Cen-
ter or a recovery vehicle is called.
If vehicle data needs to be transferred during
an MB Info call or a Roadside Assistance call, this is initiated by the Customer Assistance
center. You will see the Roadside Assis‐
Roadside Assis‐
tance Connected tance Connected message in the COMAND
display. If the vehicle remote malfunction
diagnosis can be started, the Request for
Request for
vehicle diagnosis received. Start
vehicle diagnosis received. Start
vehicle diagnosis?
vehicle diagnosis? message appears in
the display.
X Confirm the message with Yes
Yes.
X When the Vehicle Diagnosis Please
Vehicle Diagnosis Please
start ignition
start ignition message appears, turn
the SmartKey to position 2in the ignition
lock (Y page 141).
X When the Please
Please follow
followthe
theinstruc‐
instruc‐
tions received by phone and move
tions received by phone and move
your vehicle to a safe position. your vehicle to a safe position.
message appears, follow the customer ser-
vice representative's instructions.
The message in the display disappears.
If you select Cancel Cancel, the vehicle remote
malfunction diagnosis is canceled com-
pletely.
The vehicle operating state check begins.
You will see the Vehicle diagnosis Vehicle diagnosis
activated.
activated. message. When the diagnosis is completed, the
Send Send
vehicle diagnostics data//(Voice vehicle diagnostics data//(Voice
connection may be//interrupted dur‐ connection may be//interrupted dur‐
ing ing data
data transfer)
transfer) message appears. The
vehicle data can now be sent to the Customer Assistance center.
X Press OK
OKto confirm the message.
The voice connection with the Customer
Assistance center is terminated.
You will see the Vehicle Diagnosis: Vehicle Diagnosis:
Transferring data... Transferring data... message.
The vehicle data is sent to the Customer
Assistance center.
Depending on what the customer service rep-
resentative agreed with you, the voice con-
nection is re-established after the transfer is
complete. If necessary, you will be contacted at a later time by another means, e.g. by e-
mail or phone.
Further functions of the vehicle remote mal-
function diagnosis include, for example:
R transfer of service data to the Customer
Assistance center. If a service is overdue,
the COMAND display shows a message
about various special offers at your work-
shop.
R monthly status information e-mail on oil
level, air pressure, maintenance, brakes,
etc. If applicable, you will receive informa-
tion on special offers in the e-mail.
USA only: this information can also be
called up under "Owners Online" at http://
www.mbusa.com.
Information on Roadside Assistance
(Y page 23).
Downloading routes Downloading routes allows you to transfer
and save predefined routes in the navigation
system. To do this, an SD memory card must
be inserted into the COMAND system. If no
SD memory card is inserted, you must insert
the card into the card slot on the COMAND
system before saving. Features
273Stowage and features Z

Useful information
............................282
Engine compartment ........................282
Maintenance ...................................... 286
Care .................................................... 287 281Maintenance and care

Useful information
i This Operator's manual describes all
models and all standard and optional equip- ment of your vehicle available at the time of
publication of the Operator's manual.
Country-specific differences are possible.
Please note that your vehicle may not be
equipped with all features described. This
also applies to safety-related systems and
functions.
i Read the information on qualified special-
ist workshops (Y page 26). Engine compartment
Hood
Important safety notes G
WARNING
If the hood is unlatched, it may open up when the vehicle is in motion and block your view.
There is a risk of an accident.
Never unlatch the hood while driving. G
WARNING
When opening and closing the hood, it may
suddenly fall into the closed position. There is a risk of injury to persons within range of
movement of the hood.
Open and close the hood only when no one is
within its range of movement. G
WARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department. G
WARNING
The engine compartment contains moving
components. Certain components, such as
the radiator fan, may continue to run or start
again suddenly when the ignition is off. There is a risk of injury.
If you need to do any work inside the engine
compartment:
R switch off the ignition
R never reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
R remove jewelry and watches
R keep items of clothing and hair, for exam-
ple, away from moving parts G
WARNING
The ignition system and the fuel injection sys- tem work under high voltage. If you touch
components which are under voltage, you
could get an electric shock. There is a risk of
injury.
Never touch components of the ignition sys-
tem or fuel injection system when the ignition is switched on.
Opening the hood G
WARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very hot.
Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down and touch only the components described in the
following. G
WARNING
When the hood is open and the windshield
wipers are set in motion, you can be injured by the wiper linkage. There is a risk of injury.
Always switch off the windshield wipers and
the ignition before opening the hood. 282
Engine compartmentMaintenance and care

!
Make sure that the windshield wipers are
not folded away from the windshield. You
could otherwise damage the windshield
wipers or the hood. X
Make sure that the windshield wipers are
switched off.
X Pull release lever 0043on the hood.
The hood is released. X
Reach into the gap between the hood and
the radiator trim and press hood catch
lever 0044to the left.
X Raise the hood. X
Pull support strut 0085out of bracket 0083.
X Lift up support strut 0085and insert it into
yellow retaining clip 0087.
Closing the hood X
Raise the hood slightly and, at the same
time, remove support strut 0085from yellow
retaining clip 0087.
X Swing support strut 0085down and press it
into bracket 0083until it engages.
X Lower the hood and let it fall from a height
of approximately 8 in (20 cm).
X Check that the hood has engaged properly.
If the hood can be raised slightly, it is not
properly engaged. Do not press the hood
closed. Open the hood again and close it
with a little more force. Engine oil
General notes Depending on your driving style, the vehicle
consumes up to 0.9 US qt (0.8 liters) of oil per 600 miles (1,000 km). The oil consumption
may be higher than this when the vehicle is
new or if you frequently drive at high engine
speeds.
Depending on the engine, the oil dipstick may be in a different location.
When checking the oil level:
R park the vehicle on a level surface.
R the engine should be switched off for
approximately five minutes if the engine is
at normal operating temperature.
R if the engine is not at normal operating
temperature, e.g. if the engine was only
started briefly, wait about 30 minutes
before carrying out the measurement. Engine compartment
283Maintenance and care Z