2011 MERCEDES-BENZ C-CLASS COUPE check engine

Unlocking the driver's door (emer-
gency key element)
If the vehicle can no longer be unlocked with
the key, use the emergency key element.
If you use the emergency key element to
unlock and open the driver's door, the anti-
thef talarm system will be triggered
(Y page 73).
X Take the emergency key elemen tout of the
key (Y page 80).
X Inser tthe emergency key element into the
lock of the driver's door as far as it will go. X
Turn the emergency key element anti-
clockwise to position 1.
The door is unlocked.
i On right-hand-drive vehicles, turn the
emergency key element clockwise.
X Turn the emergency key element back and
remove it.
X Insert the emergency key element into the
key. Locking the vehicle (emergency key
element)
If the vehicle can no longer be locked with the
key, use the emergency key element.
X Open the driver's door.
X Close the front-passenger door and the
boot lid.
X Press the locking button (Y page 84).
X Check whether the locking knob on the
front-passenger door is still visible. Press down the locking knob by hand, if neces-
sary.
X Close the driver's door.
X Take the emergency key element out of the
key (Y page 80).
X Insert the emergency key element into the
lock of the driver's door as far as it will go. X
Turn the emergency key element clockwise
as far as it will go to position 1.
i On right-hand-drive vehicles, turn the
emergency key element anti-clockwise.
X Turn the emergency key element back and
remove it.
X Make sure that the doors and the boot lid
are locked.
X Insert the emergency key element into the
key. Boot
Important safety notes
Do not leave the key in the boot. You could
otherwise lock yourself out. G
WARNING
Exhaust fumes could enter the vehicle interior
if the engine is running and the boot lid is
open. This could poison you. Therefore, you
should make sure that the boot lid is always
closed when the engine is running.
! The boot lid swings upwards when
opened. Therefore, make sure that there is
sufficient clearance above the boot lid. Boot
85Opening and closing Z

X
Drive with the headlamps switched on.
The level of moisture diminishes, depend-
ing on the length of the journey and the
weather conditions (humidity and temper-
ature).
If the level of moisture does not diminish:
X Have the headlamps checked at a qualified
specialis tworkshop. Interior lighting
Overview of interior lighting
:
u To switch the rear interior lighting
on/off
; | To switch the automatic interior
lighting control on/off
= p To switch the right-hand front read-
ing lamp on/off
? c To switch the front interior lighting
on/off
A p To switch the left-hand front reading
lamp on/off Interior lighting control
Important notes In order to prevent the vehicle's battery from
discharging, the interior lighting functions are
automatically deactivated after some time
except for when the key is in position
2in the
ignition lock. Automatic interior lighting control X
To switch on/off: press the|button.
When the automatic interior lighting con-
trol is activated, the button is flush with the
overhead control panel.
The interior lighting automatically switches
on if you:
R unlock the vehicle
R open a door
R remove the key from the ignition lock
The interior light is activated for a short while
when the key is removed from the ignition
lock. You can activate this delayed switch-off
using the on-board computer (Y page 225).
Manual interior lighting control X
To switch the interior lighting on/off:
press the cbutton.
X To switch the reading lamps on/off:
press the pbutton. Crash-responsive emergency lighting
The interior lighting is activated automatically
if the vehicle is involved in an accident.
X To switch off the crash-responsive
emergency lighting: press the hazard
warning lamp button.
or
X Lock and then unlock the vehicle using the
key. Changing bulbs
Important safety notes
Xenon bulbs If your vehicle is equipped with xenon bulbs,
you can recognise this by the following: the
cone of light from the xenon bulbs moves
from the top to the bottom and back again
when you start the engine. For this to be114
Changing bulbsLights and windscreen wipers

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