check engine MERCEDES-BENZ C-CLASS COUPE 2011 User Guide

observed, the lights must be switched on
before starting the engine. G
DANGER
Xenon bulbs carry a high voltage. You could
get an electric shock and be seriously or even
fatally injured if you touch the electric con-
tacts on xenon bulbs. Therefore, never
remove the cover from xenon bulbs.
Do not change xenon bulbs yourself, but have
them replaced at a qualified specialist work-
shop which has the necessary specialist
knowledge and tools to carry out the work
required.
Mercedes-Benz recommends that you use a
Mercedes-Benz Service Centre for this pur-
pose. In particular, work relevant to safety or
on safety-related systems must be carried out
at a qualified specialist workshop.
Bulbs and lamps are an important aspect of
vehicle safety. You must therefore make sure
that these function correctly at all times.
Have the headlamp setting checked regularly.
Other bulbs There are bulbs other than the xenon bulbs
that you cannot replace. Replace only the
bulbs listed (Y page 115). Have the bulbs that
you cannot replace yourself changed at a
qualified specialist workshop.
Mercedes-Benz recommends that you use a
Mercedes-Benz Service Centre for this pur-
pose. In particular, work relevant to safety or
on safety-related systems must be carried out
at a qualified specialist workshop.
If you require assistance changing bulbs, con-
sult a qualified specialist workshop.
Do not touch the glass tube of new bulbs with
your bare hands. Even minor contamination
can burn into the glass surface and reduce
the service life of the bulbs. Always use a lint-
free cloth or only touch the base of the bulb
when fitting.
Only use bulbs of the correc ttype. If the new bulb still does no
tlight up, consult
a qualified specialist workshop.
Bulbs and lamps are an importan taspect of
vehicle safety. You must therefore make sure
that these function correctly at all times.
Have the headlamp setting checked regularly. G
WARNING
Bulbs and lights can become very hot. For this
reason, allow them to cool down before
changing them. Otherwise, you could burn
yourselfw hen you touch them.
Keep bulbs out of the reach of children. Oth-
erwise, they could damage them, for example,
and injure themselves.
Never use a bulb which has been dropped.
Such a bulb may explode and injure you.
Halogen bulbs are pressurised and could
explode when you change them, especially if
they are very hot. You should therefore wear
eye protection and gloves when you are
changing them. Overview of bulb replacement
–bulbs
You can change the following bulbs. The bulb
type can be found in the legend. Halogen headlamps
:
Side lamp/parking lamp: W5W
; Main-beam headlamp: H7 55 W
= Dipped-beam headlamp: H7 55 W Changing bulbs
115Lights and windscreen wipers Z

X
Remove the wiper blade from the retaining
pin on the wiper arm in the direction of the
arrow.
Fitting the wipe rblades
X Push the new wiper blade ont othe retain-
ing pin on the wiper arm in the opposite
direction to the arrow.
Make sure that the wiper blade slides fully
onto the retaining pin on the wiper arm.
X Turn the wiper blade parallel to the wiper
arm.
X Fold the wiper arm back onto the wind-
screen. Problems with the windscreen wipers
The windscreen wipers are obstructed Leaves or snow, for example, may be
obstructing the windscreen wiper movement.
The wiper motor has been deactivated.
X
For safety reasons, you should remove the
key from the ignition lock.
or
X Switch off the engine using the Start/Stop
button and open the driver's door.
X Remove the cause of the obstruction.
X Switch the windscreen wipers back on.
The windscreen wipers are inoperative The windscreen wiper drive is malfunctioning. X
Select another wiper speed on the combi-
nation switch.
X Have the windscreen wipers checked at a
qualified specialist workshop.
The spray nozzles are misaligned The windscreen washer fluid from the spray
nozzles no longer hits the centre of the wind-
screen. The spray nozzles are misaligned.
X Have the spray nozzles adjusted at a quali-
fied specialist workshop. 120
Windscreen wipersLights and windscreen wipers

Problem Possible causes/consequences and
M Solutions
Vehicles with a petrol
engine:
The engine is not run-
ning smoothly and is
misfiring. There is a malfunction in the engine electronics or in a mechanical
component of the engine management system.
X
Only depress the accelerator pedal slightly.
X Have the cause rectified immediately at a qualified specialist
workshop, e.g. a Mercedes-Benz Service Centre.
Otherwise, non-combusted fuel may get into the catalytic con-
verter and damage it. The coolant tempera-
ture display is showing
more than 120 †. The
coolant warning lamp
may also be lit and a
warning tone may
sound. The coolant level is too low. The coolant is too hot and the engine
is no longer being cooled sufficiently.
X
Stop as soon as possible and allow the engine and the coolant
to cool down.
X Check the coolant level (Y page 303). Observe the warning
notes as you do so and top up the coolant if necessary. If the coolant level is correct, the engine radiator fan may be faulty.
The coolant is too hot and the engine is no longer being cooled
sufficiently.
X
At coolant temperatures under 120 †, drive on to the nearest
qualified specialist workshop, e.g. to a Mercedes-Benz Service
Centre.
X Avoid heavy loads on the engine as you do so, e.g. driving on
mountain roads and stop/start driving. Manual transmission
Gear lever
Gear lever
!
Only engage gear when the clutch pedal
is depressed.
! When shifting between 5thand 6thgear,
you should always push the gear lever all the way to the right. Otherwise, you could
shift unintentionally into
3rdor4th gear
and damage the transmission.
If you shift down at too high a speed (trans-
mission braking), this can cause the engine
to overrev, leading to engine damage.
Do not use the clutch bite point to keep the
vehicle stationary on uphill gradients.
There is otherwise a risk of damaging the
clutch.
! On long and steep downhill gradients,
especially if the vehicle is laden or towing
a trailer, you must shift into gear 1, 2or3
in good time. This uses the engine's braking
effect.T his relieves the load on the brake
system and prevents the brakes from over-
heating and wearing too quickly. 144
Manual transmissionDriving and parking

Problems with the transmission
Problem Possible causes/consequences and
M Solutions
The transmission has
problems shifting gear. The transmission is losing oil.
X
Have the transmission checked at a qualified specialist work-
shop, e.g. a Mercedes-Benz Service Centre, immediately. The acceleration ability
is deteriorating.
The transmission no
longer changes gear. The transmission is in emergency mode.
It is only possible to shift into
secondgear and reverse gear.
X Stop the vehicle.
X Shift the transmission to position P.
X Switch off the engine.
X Wait at least 10 seconds before restarting the engine.
X Shift the transmission to position Dor R.
If D is selected, the transmission shifts into secondgear; ifRis
selected, the transmission shifts into reverse gear.
X Have the transmission checked at a qualified specialist work-
shop, e.g. a Mercedes-Benz Service Centre, immediately. Releasing the parking lock manually
In the event of an electrical fault, it is possible
to release the selector lever lock manually to
move it out of position P, e.g. if you wish to
tow the vehicle away. !
Do not use any sharp-edged objects to lift
up the selector lever cover in the centre
console. Otherwise, the selector lever
cover could be damaged.
X Engage the parking brake.
X Prise out selector lever gaiter :with a flat,
blunt object, (e.g. ascrewdriver wrapped in cloth) from the right-hand edge, pulling it
up and out.
X Press release button ;dow nand simul-
taneously move the selecto rlever out of
position P.
The selector lever can now be moved freely
until it is returned to position P. Refuelling
Important safety notes
G
WARNING
Fuel is highly flammable. Fire, naked flames
and smoking are therefore prohibited when
handling fuels.
Switch off the engine and the auxiliary heating
before refuelling. G
WARNING
Do not come into contact with fuels.
It is hazardous to your health if your skin
comes into direct contact with fuels or you
breathe in fuel vapours. 152
RefuellingDriving and parking

The LIM indicator lamp on the cruise control
lever indicates which system you have selec-
ted:
R LIM indicator lamp off: cruise control is
selected.
R LIM indicator lamp on: variable SPEED-
TRONIC is selected. :
To store the curren tspeed or a higher
speed
; LIM indicator lamp
= To store the curren tspeed or call up the
last stored speed
? To store the curren tspeed or a lower
speed
A To switch between cruise control and var-
iable SPEEDTRONIC
B To deactivate cruise control
When you activate cruise control, the stored
speed is shown in the multifunction display
for five seconds. Vehicles with the 4-button
multifunction steering wheel: the stored
speed is then permanently displayed in the
status indicator together with the ¯sym-
bol. Vehicles with the 12-button multifunc-
tion steering wheel: the segments from the
stored speed up to the maximum speed light
up in the multifunction display.
Selecting cruise control X
Check whether LIM indicator lamp ;is off.
If it is off, cruise control is already selected. If it is not, press the cruise control lever in
the direction of arrow A.
LIM indicator lamp ;in the cruise control
lever goes out. Cruise control is selected.
Storing and maintaining the current
speed You can store the curren
tspeed if you are
driving faster than 30 km/h.
X Accelerate the vehicle to the desired
speed.
X Briefly press the cruise control lever
up : or down ?to the pressure point.
X Remove your foot from the accelerator
pedal.
Cruise control is activated. The vehicle
automatically maintains the stored speed.
i Cruise control may be unable to maintain
the stored speed on uphill gradients. The
stored speed is resumed when the gradient
evens out. Cruise contro lmaintains the
stored speed on downhill gradients by
automatically applying the brakes.
i Vehicles with manual transmission:
R always drive at adequate, but no texces-
sive, engine speeds.
R change gear in good time.
R if possible, do not change down several
gears at a time.
Storing the curren tspee dorc alling up
the last stored speed G
WARNING
Only call up a stored spee difyou know what
that speed is and if it is suitable for the current
traffic and driving situation. You can other-
wise endanger yourself or others by uninten-
tionally triggering sudden acceleration or
braking. Driving systems
163Driving and parking Z

G
WARNING
Do not change downf or additional engine
braking on a slippery road surface. This could
cause the drive wheels to lose their grip and
the vehicle could skid.
You can set a variable or permanent limit
speed:
R variable for speed limits, e.g. in built-up
areas
R permanent for long-term speed restric-
tions, e.g. when driving with winter tyres
fitted (Y page 176) G
WARNING
Speedtronic is only an aid designed to assist
driving. You are responsible for the vehicle's
speed and for braking in good time.
i The speed indicated in the speedometer
may differ slightly from the limit speed
stored.
Variable SPEEDTRONIC General notes
With the cruise control lever, you can operate
cruise control or DISTRONIC PLUS and vari-
able SPEEDTRONIC.
The LIM indicator lamp on the cruise control
lever indicates which system you have selec-
ted:
R LIM indicator lamp off: cruise control or
DISTRONIC PLUS is selected.
R LIM indicator lamp on: variable SPEED-
TRONIC is selected.
You can use the cruise control lever to limit
the speed to any speed above 30 km/hw hile
the engine is running. :
To store the current speed or a higher
speed
; LIM indicator lamp
= To store the current speed or to call up
the last stored speed
? To store the current speed or a lower
speed
A To switch between cruise control and var-
iable SPEEDTRONIC
B To deactivate variable SPEEDTRONIC
Selecting variable SPEEDTRONIC
X Check whether LIM indicator lamp ;is on.
If it is on, variable SPEEDTRONIC is already
selected.
If it is not, press the cruise control lever in
the direction of arrow A.
LIM indicator lamp ;in the cruise control
lever lights up. Variable SPEEDTRONIC is
selected. G
WARNING
If there is a change of drivers, advise the new
driver of the limit speed stored.
Only use variable SPEEDTRONIC if you will not
have to accelerate suddenly to a speed above
that stored as the limit speed. You could oth-
erwise cause an accident.
You can only exceed the limit speed stored if
you deactivate variable SPEEDTRONIC:
R using the cruise control lever
R by depressing the accelerator pedal
beyond the pressure point (kickdown) 174
Driving systemsDriving and parking

from the side
.When you overtake a vehicle,
the warning only occurs if the difference in
speed is less than 12 km/h.
The yellow indicator lamp goes out if reverse
gear is engaged. Blind Spot Assist is then
deactivated.
The brightness of the indicator/warning
lamps is adjusted automatically according to
the ambient light. G
WARNING
Blind Spot Assist is not active at speeds below
30 km/h, and the indicator lamps in the exte-
rior mirrors are yellow.V ehicles in the moni-
toring range are then not indicated.
Always pay attention to traffic conditions and
your surroundings. Otherwise, you may fail to
recognise dangers in time, cause an accident
and injure yourself and others.
Collision warning
If a vehicle is detected in the monitoring range
of Blind Spot Assist and you switch on the turn
signal, a double warning tones ounds. Red
warning lamp :flashes. If the turn signal
remains on, detected vehicles are indicated
by the flashing of red warning lamp :.There
are no further warning tones.
Switching on Blind Spot Assist
X On vehicles without a navigation system,
make sure that the Becker ®
MAP PILOT is
connected; see the separate operating
instructions for Audio 20.
X Make sure that the radar sensor system
(Y page 226) and Blind Spot Assist
(Y page 222) are activated in the on-board
computer.
X Turn the key to position 2in the ignition
lock.
Warning lamps :light up red in the exte-
rior mirrors for approximately 1.5 seconds
and then turn yellow. Trailer towing
If you attach a trailer, make sure you have
correctly established the electrical connec-
tion. This can be accomplished by checking
the trailer lighting. In this event, Blind Spot
Assist is deactivated. The indicator lamp in
the exterior mirrors lights up yellow, and the
Blind Spot Assist currently unavail‐
able See Owner's Manual message
appears in the multifunction display.
i You can deactivate the indicator lamps in
the exterior mirrors.
To do so, switch off Blind Spot Assist if:
R the key is in position 2in the ignition
lock.
R the engine is not running.
R the electrical connection to the trailer
has been established.
Lane Keeping Assist Important safety notes
Lane Keeping Assist monitors the area in
front of your vehicle by means of a camera at
the top of the windscreen. Lane Keeping
Assist detects lane markings on the road and
warns you before you leave your lane unin-
tentionally. :
Lane Keeping Assist camera
If you have chosen the Display unit Speed-/odometer: (Y
page 223) function in
the on-board computer and select kmkm as
the unit of measurement, Active Lane Keep-
ing Assist is active from speeds of 60 km/h. 192
Driving systemsDriving and parking

Display messages Possible causes/consequences and
M Solutions
J
Brake immediately A malfunction has occurred while the HOLD function is active.
or
Vehicles wit
hmanual transmission: with the HOLD function
activated, you have:
R opened the driver's door and released the sea tbelt or
R switched off the engine or
R opened the bonnet
At one may also sound at regular intervals. The tone becomes
louder if you attempt to lock the vehicle.
You cannot start the engine.
X Paying attention to the traffic situation, immediately depress the
brake pedal firmly and hold until the display message disap-
pears.
X Prevent the vehicle from rolling away before you leave it
(Y page 321).
You can restart the engine. J
Check brake fluid
level G
Risk of accident
There is insufficien tbrake fluid in the brake fluid reservoir. In addi-
tion, the red Jwarning lamp lights up in the instrument cluster
and a warning tone sounds.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X Apply the parking brake.
X Consult a qualified specialist workshop.
X Do not top up the brake fluid. This does not correct the error. #
Check brake wear The brake pads/linings have reached their wearl
imit.
X Visit a qualified specialist workshop. PRE-SAFE
inoperative G
Risk of injury
Important function sof PRE-SAFE ®
have failed .All other occupant
safety systems, e.g. airbags, remain available.
X Visit a qualified specialist workshop. ü If the symbol appears in the multifunction display,
aseat belt
tongue has been clipped into a rear seat belt buckle.
For further information on the status indicator for the rear seat
belts: (Y page 54). 236
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
J
Brake immediately A malfunction has occurred while the HOLD function or DIS-
TRONIC PLUS is active.
or
Vehicles with manual transmission: with the HOLD function acti-
vated, you have either:
R
opened the driver's doo rand released the sea tbelt or
R switched off the engine or
R opened the bonnet
At one may also sound at regular intervals. The tone becomes
louder if you attempt to lock the vehicle.
You cannot start the engine.
X Paying attention to the traffic situation, immediately depress the
brake pedal firmly and hold until the display message disap-
pears.
X Prevent the vehicle from rolling away before you leave it
(Y page 321).
You can restart the engine. J
Check brake fluid
level G
Risk of accident
There is insufficien tbrake fluid in the brake fluid reservoir. In addi-
tion, the red Jwarning lamp in the instrument cluster lights
up and a warning tone sounds.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X Apply the parking brake.
X Consult a qualified specialist workshop.
X Do not top up the brake fluid. This does not correct the error. #
Check brake wear The brake pads/linings have reached their wearl
imit.
X Visit a qualified specialist workshop. PRE-SAFE
inoperative See
Owner's Man. G
Risk of injury
Important function sof PRE-SAFE ®
have failed .All other occupant
safety systems, e.g. airbags, remain available.
X Visit a qualified specialist workshop immediately. Display messages
241On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
b
Switch off lights The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
X Tur nthe light switch to Ã. Adaptive Main-beam
Assist inoperative Adaptive Highbeam Assist is faulty.
X
Visit a qualified specialist workshop. Adaptive Main-beam
Assist currently
unavailable See
Owner's Manual Adaptive Highbeam Assist is deactivated and temporarily inoper-
ative if:
R
the windscreen is dirty in the camera's field of vision.
R visibility is impaired due to heavy rain, snow or fog.
X Cleant he windscreen.
Adaptive Highbeam Assist is available again if:
R the dirt (e.g. slush) drops away while the vehicle is in motion.
R the system detects that the camera is fully operational again.
The Adaptive Main-beam Assist available again message
is displayed. Engine (4-button multifunction steering wheel)
Display messages Possible causes/consequences and
M Solutions
Top up
coolant The coolant level is too low.
X Top up the coolant, observing the warning notes when doing so
(Y page 303).
X If the coolant needs topping up more often than usual, have the
engine coolant system checked at a qualified specialist work-
shop. ?
Stop vehicle Sw.
eng. Off The coolant is too hot.
Aw
arning tone also sounds.
X Stop the vehicle immediately, paying attentio ntoroad and traf-
fic conditions, and switch off the engine.
X Make sure that the air supply to the engine radiator is not
blocked, e.g. by frozen slush.
X Wait until the display message disappears before restarting the
engine. Otherwise, there is a risk of engine damage.
X Pay attention to the coolant temperature display.
X If the temperature increases again, visit a qualified specialist
workshop immediately. Display messages
251On-board computer and displays Z