2015 MERCEDES-BENZ C-CLASS COUPE check engine

X
With your hand flat, push down active bon-
net :in the area around the hinges on both
sides (arrows) until you feel it engage.
If you can raise the active bonnet slightly in the
area around the hinges, it is not engaged cor-
rectly. Repeat the step.
Opening the bonnet G
WARNING
Certain componentsint he engine compart-
ment could be very hot, e.g. the engine, the
radiator and parts of the exhaust system.
There is arisk of injury when accessin gthe
engine compartment.
As far as possible, allow the engine to cool
down and only touch the componentsd escri-
bed in the following. G
WARNING
When the bonnet is open, and the windscreen wipers are set in motion ,you can be injured by
the wiper linkage. There is arisk of injury.
Always switch off the windscreen wipers and
the ignition before opening the bonnet.
! Make sure that the windscreen wipers are
not folded away from the windscreen .Other-
wise, you could damage the windscreen wip-
ers or the bonnet. X
Make sure that the windscreen wipers are
switched off.
X Pull release lever :on the bonnet.
The bonnet is released. X
Reach into the gap, pull bonnet catc hhan-
dle ;up and lift the bonnet.
If you lift the bonnet by approximately 40 cm, the bonnet is opened and held open automat-
ically by the gas-filled strut.
Closing the bonnet X
Lower the bonnet and let it fall from aheight
of approximately 20 cm.
X Check that the bonnet has engaged properly.
If the bonnet can be raised slightly, it is not
properly engaged. Open it again and close it
with alittle more force. Radiator
Do not cover up the radiator. Do not use thermal mats, insect protection covers or anything sim-
ilar. Doing so can cause the Onboard Diagnos-
tics System to display inaccurat evalues. Some
of these values are legally required and must
alway sbec orrect. 322
Engine compartmentMaintenance and care

Engine oil
Important safety notes G
WARNING
Certain component sintheengine compart-
men tcoul dbev eryh ot,e .g.t he engine ,the
radiator and part softheexhaust system.
Ther eisar isk of injury when accessing the
engine compartment.
As far as possible, allow th eengine to cool
down and only touch th ecomponent sdescri-
bed in th efollowing. G
WARNING
If engine oil comes int ocontac twith hot com-
ponent sintheengine compartment, it may
ignite .Ther eisar isk of fir eand injury.
Mak esure that engine oil does no tspill out
ove rthe fille rneck. Allo wthe engine to cool
down and thoroughly clean th ecomponents
that have com eintoc ontac twith engine oil
before you start th eengine.
General notes Dependin
gonyour driving style, th evehicle
consume supto0.8litres of oil per 1,000 km.
The oil consumptio nmay be higher than this
when th evehicle is new or if you frequently drive
at high engine speeds.
Dependin gontheengine ,the oil dipstick may be
installed at adifferen tlocation.
When checking th eoil level:
R park th evehicle on aleve lsurface
R thee ngine shoul dbeswitched off for approx-
imately fiv eminute siftheengine is at normal
operatin gtem perature
R all vehicle s(excep tMercedes-AM GC63/C
63S): if th eengine is no tatnormaloperating
temperature, e.g .iftheengine was only star-
te db riefly, wait approximately 30 minutes
before carryin gout th emeasurement
The oil leve loftheMercedes-AM GC63/C6 3S
must be checked only when th eengine is at
normal operatin gtem perature. Checking th
eoil level usin gthe oil dip-
stick Example
X Pull oil dipstick :out of th eoil dipstick tube.
X Wipe off oil dipstick :.
X Slowly slide dipstick :intothe guide tub eto
th es top, and tak eitout again after approx-
imately 3seconds.
If th eleve lisb etween MIN mark =and MAX
mark ;,theoil leve liscorrect.
X If th eoil leve lhas dropped to MIN mark =or
below, to pupwith 1.0lof engine oil.
Toppin gupengine oil H
Environmental note
When toppin guptheoil, tak ecaren otto spill
any. If oil enters th esoil or waterways, it is
harmful to th eenvironment.
! Only use engine oils and oil filters that have
been approved for vehicle swithaservic esys-
tem. You can obtain alist of th eengine oils
and oil filters tested and approved in accord- anc ewith th eMercedes-Ben zSpecifications
for Servic eProduct satany Mercedes-Benz
Servic eCentre.
Damage to th eengine or exhaust system is
caused by th efollowing:
R usin gengine oils and oil filters that have not
been specifically approved for th eservice
system
R changing th eengine oil and oil filter after
missing th echang einterval required by the
servic esystem
R usin gengine oil additives
! Do no
tadd to omucho il. Topping up with too
muc hengine oil can result in damag etothe Engine compartment
323Maintenance and care Z

engine or to the catalytic converter. Have
exces
sengine oil siphoned off. Example
X Turn cap :anti-clockwise and remove it.
X Top up the engine oil.
If the oil level is at or below the MIN mark on
the oil dipstick ,top up with 1.0 lofe ngine oil.
X Replace cap :on the filler neck and turn
clockwise.
Make sure that the cap locks securely into
place.
X Check the oil leve lagain with the oil dipstick
(Y pag e323).
For further information on engine oil ,see
(Y pag e375). Other service products
Important safety notes G
WARNING
Certain components in the engine compart-
ment coul dbevery hot, e.g. the engine, the
radiator and parts of the exhaust system.
There is arisk of injury when accessing the
engine compartment.
As far as possible ,allow the engine to cool
dow nand only touch the components descri-
bed in the following. G
WARNING
The cooling system is pressurised, particu-
larl yw hen the engine is warm. If you open the
cap, you coul dbescalded if hot coolant
sprays out. There is arisk of injury. Let the engine cool dow
nbefore you open the
cap. Wea rglove sand eye protection. Open
the cap slowly to release the pressure. G
WARNING
If windscreen washer concentrate comes into contact with hot components of the engine or
the exhaust system, it can ignite. There is a
risk of fire and injury.
Make sure the windscreen washer concen-
trate does not come into contact with the filler neck.
Checking the coolan tlevel X
Park the vehicl eonalevelsurface.
Only check the coolant leve lifthe vehicl eis
on aleve lsurface and the engine has cooled
down.
X Turn the key to position 2in the ignition lock
(Y pag e145).
or
X On vehicles with KEYLESS-GO, press the
Start/Stop button twice (Y page145).
X Check the coolant temperature display in the
instrument cluster (Y page233).
The coolant temperature must be below
70 †.
X Turn the key to position 0(Y pag e145).
or
X On vehicles with KEYLESS-GO, pul lthe Start/
Stop button from the ignition lock
(Y pag e145).
X Slowl yturn cap :halfat urn anti-clockwise
to allow excess pressure to escape. 324
Engine compartmentMaintenance and care

X
Press 9or: on the steerin gwheel to
select the Service
Servicemenu and confirm with
a.
X Press 9or: on the steerin gwheel to
select the ASSYST PLUS
ASSYST PLUS submenu and con-
firm with a.
The service due date appears in the multi-
function display. Information about service
Resetting the ASSYST PLUS service
interva ldisplay !
If the ASSYST PLUS service interval display
has been inadvertently reset, this setting can
be corrected at aqualified specialist work-
shop.
Have service work carried out as described in the Servic eBooklet .This may otherwise lead
to increased wear and damage to the major
assemblies or the vehicle.
Aq ualified specialist workshop, e.g. a
Mercedes-Benz Servic eCentre, will reset the
ASSYST PLUS service interval display after the
service work has been carried out. You can also
obtain further information on maintenance
work, for example.
Special service requirements The prescribed service interval is based on nor-
mal operation of the vehicle. Servic ework will
need to be performed more often if the vehicle is
operated under arduous conditions or increased loads, for example:
R regular city driving with frequent intermediate
stops
R if the vehicle is primarily used to travel short
distances
R for frequent operation in mountainous terrain
or on poor road surfaces
R if the engine is often left idling for long periods
In these or similar operating conditions, have,
for example, the air filter, engine oil and oil filter changed more frequently. The tyres must be
checked more frequently if the vehicle is oper-
ated under increased loads. Further informationcan be obtained at aqualified specialist work-
shop, e.g. aMercedes-Benz Servic eCentre. Driving abroad An extensive Mercedes-Benz Servic
enetwor kis
also availabl einother countries. You can obtain
further information from any Mercedes-Benz
Servic eCentre. Care
General notes
H
Environmenta
lnote
Dispose of empty packaging and cleaning
cloths in an environmentally responsible man-
ner.
! For cleaning your vehicle, do not use any of
the following:
R dry, rough or hard cloths
R abrasive cleaning agents
R solvents
R cleaning agents containing solvents
Do not scrub.
Do not touch the surfaces or protective films
with hard objects, e.g. aring or ice scraper.
You could otherwise scratch or damage the
surfaces and protective film.
! Do not park up the vehicle for an extended
period straight after cleaning it, particularly
after having cleaned the wheels with wheel
cleaner. Wheel cleaners could cause
increased corrosion of the brake discs and
brake pads/linings. For this reason, you
should drive for afew minutes after cleaning.
Brakin gheats the brake discs and the brake
pads/linings, thus drying them. The vehicle
can then be parked up.
Regula rcare of your vehicle is acondition for
retainin gthe quality in the long term.
Use care products and cleaning agents recom-
mended and approved by Mercedes-Benz. 326
CareMaintenance and care

of the reach of children. Immediately rinse off
battery acid thoroughly with plenty of clean
water and seek medical attention at once. G
WARNING
Ad ischarged battery can freeze at tempera-
tures below freezin gpoint. When jump-start-
ing the vehicle or charging the battery, gases can escape from the battery. There is arisk of
an explosion.
Allow the frozen battery to thaw out before
charging it or jump-starting.
! Only use battery chargers with
amaximum
charging voltage of 14.8 V.
All vehicles:
! Only charge the battery using the jump-start
connection point.
The jump-starting connection point is in the
engine compartment (Y page 345).
X Open the bonnet.
X Connect the battery charger to the positive
terminal and earth point in the same order as
when connectingt he donor battery in the
jump-starting procedure (Y page 345).
Keep away from fire and naked flames. Do not
lean over the battery. Never charge the battery
if it is still fitted to the vehicle, unless you use a battery charger which has been tested and
approved by Mercedes-Benz. Abattery charger
unit specially adapted for Mercedes-Benz vehi-
cles and tested and approved by Mercedes-
Benz is available as an accessory. This device
permits charging of the battery in position. Con-
tact aMercedes-Benz Service Centre for infor-
mation and availability. Read the battery charg-
er's operating instructions before charging the
battery.
All vehicles except vehicles with alithium-
ion battery: if the indicator/warning lamps in
the instrument cluster do not light up at low
temperatures, it is very likely that the dis-
charged battery has frozen .Inthis case you may
neither jump-start the vehicle nor charge the
battery. The service life of abattery that has
been thawed may be reduced. The starting char-
acteristics may be impaired, especially at low
temperatures. Have the thawed battery
checked at aqualified specialist workshop. Vehicles with
alithium-ion battery: at low
temperatures, do not charge abattery which has
been removed using abattery charger. Allow the
battery to warm up gently first, if necessary.
Otherwise, the service life can be shortened and the starting characteristics impaired, especially
at low temperatures. 344
Battery (vehicle)Breakdown assistance

Jump-starting
For the jump-starting procedure, use only the jump-starting connection point, consisting of apos-
itive terminal and an earth point, in the engine compartment.
All vehiclese xcept vehiclesw ithalithium-ion battery: G
WARNING
Battery acid is caustic. There is arisk of injury.
Avoid contact with the skin, eyes or clothing. Do not breathe in any battery gases. Do not lean over the battery. Keep the batteries out of the reach of children. Immediately rinse off battery acid
thoroughly with plenty of clean water and seek medical attention at once. G
WARNING
During charging and jump-starting, explosive gases can escape from the battery. There is arisk
of an explosion.
Particularly avoid fire, naked flames, creating sparks and smoking. Ensure there is sufficient
ventilation while charging and jump-starting. Do not lean over abattery. G
WARNING
During the charging process, abattery produces hydrogen gas. If ashort circuit occurs or sparks
are created, the hydrogen gas can ignite. There is arisk of an explosion.
R Make sure that the positive terminal of aconnected battery does not come into contact with
vehicle parts.
R Never place metal objects or tools on abattery.
R It is important that you observe the described order of the battery terminals when connecting
and disconnecting abattery.
R When jump-starting, make sure that the battery poles with identical polarity are connected.
R It is particularly important to observe the described order when connecting and disconnecting
the jump leads.
R Never connect or disconnectt he battery terminals while the engine is running.G
WARNING
Ad ischarged battery can freeze at temperatures below freezing point. When jump-starting the
vehicle or charging the battery, gases can escape from the battery. There is arisk of an explosion.
Allow the frozen battery to thaw out before charging it or jump-starting.
If the indicator/warning lamps do not light up at low temperatures, it is very likely that the dis-
charged battery has frozen.Int his case you may neither jump-start the vehicle nor charge the
battery. The service life of abattery that has been thawed may be reduced. The starting charac-
teristics may be impaired, especially at low temperatures. Have the thawed battery checked at a
qualified specialist workshop.
All vehicles:
! Vehicles with
apetrol engine: avoid repeated and lengthy starting attempts.O therwise, the
non-combusted fuel may damage the catalytic converter. Jump-starting
345Breakdown assistance Z

X
Slide cover Aof positive terminal :in the direction of the arrow.
X Connect positive terminal :on your vehicl etopositive terminal ;of dono rbattery Busing the
jump lead .Alway sbegin with positive terminal :on your ow nvehicl efirst.
X Start the engine of the dono rvehicl eand run it at idling speed.
X Connect negative terminal =of dono rbattery Bto earth point ?of your vehicl eusing the jump
lead ,connecting the jump lead to dono rbattery Bfirst.
X Start the engine.
X Before disconnecting the jump leads, le tthe engines run for several minutes.
X First, remove the jump lead sfrom earth point ?and negative terminal =,then from positive
clamp :and positive terminal ;.Begine acht ime at the contacts on your ow nvehicl efirst.
X Close cover Aof positive terminal :afte rremoving the jump leads.
X Have the battery checke dataqualified specialist workshop.
Jump-starting is not considered to be anorma loperating condition.
i Jump-starting cable
sand further information regarding jump starting can be obtaine datany
qualified specialist workshop. Towin
gawayand tow-starting Important safety notes
G
WARNING
Safety relevant functions are restricted or no
longer available if:
R the engine is not running
R the brake system or power steering is mal-
functioning
R there is amalfunction in the voltag esupply
or the vehicle's electrical system
Whe nyourv ehicl eist owedawayort owed
started, yo umay require considerably more
effort to stee rand brake. There is ariskofan
accident.
In such cases us earigid towing bar. Before
being towe dawayort ow started, make sure
the steering move sfreely. G
WARNING
If the steering wheel lock is engaged ,the vehi-
cle can no longer be steered .There is ariskof
an accident.
Alway sswitch on the ignition when towing
with atow rop eorat owing bar. G
WARNING
Whe ntowing or tow-starting another vehicle
and its weigh tisg reate rthan the permissible
gross weight of your vehicle, the:
R towing ey emay be torn off
R car/traile rcombination may swerve or
eve noverturn
There is ariskofana ccident.
Whe ntowing or tow-starting another vehicle,
its weight shoul dnot be greate rthan the per-
missible gross weight of your vehicle.
Details on the permissible gross vehicl eweight
of your vehicl ecan be found on the vehicl eide n-
tification plate (Y page 370).
! Whe
nCOLLISIO NPREVENTION ASSIST
PLUS, DISTRONIC PLU Sorthe HOLD function
is activated, the vehicl ebrakes automatically
in certain situations.
To avoid damag etothe vehicle, deactivate
thes esystems in the following or similar sit-
uations:
R when towing away
R in ac ar wash
! Make sure that the electri
cparking brake is
released .Ifthe electri cparking brake is faulty,
visit aquali fied specialist workshop.
! Only secure the tow cable or tow ba
rtothe
towing eyes or, if available ,tothe traile rtow Towin
gawayand tow-starting
347Breakdown assistance Z

must be positioned vertically, directly under
the jacking point of the vehicle.
Observe the following when raising the vehi- cle:
R only use the vehicle-specifi cjack that has
been tested and approved by Mercedes-Benz
to rais ethe vehicle. If the jack is used incor-
rectly, it could tip over while the vehicl eis
raised.
R the jack is designed only to rais eand hold the
vehicl efor as hort time while awhee lisb eing
changed. It is not permissibl etouse it to per-
form maintenance work under the vehicle.
R avoi dchanging the whee lonuphill and down-
hill slopes.
R before raising the vehicle, safeguard it from
rolling awaybya pplying the parking brake and
positioning whee lchocks. Do not release the
parking brake while the vehicl eisraised.
R the jack must be placed on afirm, flat and
non-slip surface. On aloose surface, alarge,
flat load-bearing underlay must be used .Ona
slippery surface, anon-slip underlay must be
used ,e.g. rubber mats.
R do not use wooden blocks or similar objects
as ajack underlay.O therwise, the jack willn ot
be abletoa chieve its load-bearing capacity
due to the restricted height.
R make sure that the distance betwee nthe
underside of the tyres and the ground does
not exceed 3cm.
R never place yourh ands or feet under the
raised vehicle.
R do not lie under the vehicle.
R do not start the engine when the vehicl eis
raised.
R do not open or close adoor or the boot lid
when the vehicl eisraised.
R make sure that no persons are present in the
vehicl ewhen the vehicl eisraised.
Vehicles with light-alloy wheels and hub
caps: the whee lbolts are covered by ahub cap.
Before you can unscrew the whee lbolts, you
must remove the hub cap. Two different variants
can be fitted. Vehicles with plastic hub cap:
X To remove: turn the centre cover of hub
cap :anti-clockwis eand remove.
X To fit: before fitting, ensure that hub cap :is
in the open position. To do this, turn the
centre cover anti-clockwise.
X Position hub cap :and turn the centre cover
clockwise until hub cap :engage sphysically
and audibly.
X Make sure that hub cap :is fitted securely. Vehicles with aluminium hub cap:
X To remove: take socket;and whee lwrench
= from the vehicl etool kit (Y page 336).
X Position socket ;on hub cap :.
X Position whee lwrench =on socket ;.
X Using whee lwrench =,turn hub cap :anti-
clockwise and remove it.
X To fit: before fitting, check hub cap :and
the whee larea for dirt and clean if necessary.
X Put hub cap :in position and turn until it is in
the right position.
X Position socket ;on hub cap :.
X Attach whee lwrench =to socket ;and
tighten hub cap :.
The tightening torque must be 25 Nm. Changing
awheel
363Wheelsa nd tyres Z