check engine MERCEDES-BENZ C-CLASS CABRIOLET 2016 User Guide

Key functions
:
& Locks the vehicle
; F Opens the boot lid
= % Unlocks the vehicle
X To unlock centrally: press the%button.
If you do not open the vehicle within approx-
imately 40 seconds of unlocking:
R the vehicle locks again
R protection against theft is reactivated
X To lock centrally: press the&button.
The key centrally locks and unlocks the follow-
ing components:
R the doors
R the boot lid
R the glove compartment
R the fuel filler flap
During unlocking, the turn signals flash once.
During locking, they flash three times.
You can also set an audible signal to confirm
that the vehicle has been locked. The audible
signal can be activated and deactivated via the
multimedia system (see Digital Owner's Man-
ual).
Only when all the components have been locked is the visual or audible locking confirmation
issued.
When the locator lighting is activated via the
multimedia system, it lights up when it is dark
after the vehicle is unlocked with the key (see
Digital Owner's Manual).
X To open the boot lid automatically from
outside the vehicle: press and hold theF
button until the boot lid opens. KEYLESS-GO
General notes Note that the engine can be started by any of the
vehicle occupants if there is a key in the vehicle
(Y page 135).
Locking and unlocking centrally You can start, lock or unlock the vehicle using
KEYLESS-GO. To do this, you need to carry the
key with you. You can combine the KEYLESS-GO functions with the functions of a conventional
key. Unlock the vehicle using KEYLESS-GO, for
instance, and lock it using the &button on
the key.
The driver's door and the door at which the han- dle is used must both be closed. The key must beoutside the vehicle. When you lock or unlock the
vehicle with KEYLESS-GO, the distance between the key and the door handle must not be greater
than 1 m.
A check that periodically establishes a radio
connection between the vehicle and the key
determines whether a valid key is in or in the
direct vicinity of the vehicle. This occurs, for
example:
R during engine start
R during driving
R when the external door handles are touched
R during convenience closing X
To unlock the vehicle: touch the inner sur-
face of the door handle.
X To lock the vehicle: touch sensor surface :
or ;. 82
KeyOpening and closing

Make sure that you do not touch the inner
surface of the door handle.
X Convenience closing feature: touch
recessed sensor surface ;for an extended
period.
Deactivating and activating If you do not intend to use a key for an extended
period of time, you can deactivate the KEYLESS-
GO function of the key. The key will then use very
little power, thereby conserving battery power.
For the purposes of activation or deactivation,
the vehicle does not have to be nearby.
X To deactivate: press the&button on the
key twice in rapid succession.
The battery indicator lamp (Y page 84) of
the key flashes twice briefly and lights up
once, then KEYLESS-GO is deactivated.
X To activate: press any button on the key.
or X Insert the key into the ignition lock.
KEYLESS-GO and all its associated features
are available again. KEYLESS-GO start function
General notes Bear in mind that the engine can be started by
any of the vehicle occupants if there is a key in
the vehicle (Y
page 135). Changing the settings of the locking
system
You can change the settings of the locking sys-
tem. This means that only the driver's door and
the fuel filler flap are unlocked when the vehicle is unlocked. This is useful if you frequently travel
alone.
X To change the setting: simultaneously press
the % and& buttons for approximately
six seconds until the battery check lamp
(Y page 84) flashes twice.
If the setting of the locking system is changed
within the signal range of the vehicle, pressing
the & or% button:
R locks or
R unlocks the vehicle The key now functions as follows:
X To unlock: press the%button once.
X To unlock centrally: press the%button
twice.
X To lock: press the &button.
The KEYLESS-GO functions can be changed as
follows: X To unlock the driver's door: touch the inner
surface of the door handle on the driver's
door.
X To unlock centrally: touch the inner surface
of the front-passenger door handle.
X To lock centrally: touch the outer sensor
surface on one of the door handles.
X To restore the factory settings: press and
hold the %and& buttons simultane-
ously for approximately six seconds until the
battery check lamp (Y page 84) flashes
twice. Emergency key element
General notes If the vehicle can no longer be unlocked with the
key or KEYLESS-GO, use the emergency key ele-
ment.
If you use the emergency key element to unlock
and open the driver's door, the anti-theft alarm
system will be triggered. Switch off the alarm
(Y page 78).
If you unlock the vehicle using the emergency
key element, the fuel filler flap will not be
unlocked automatically.
X To unlock the fuel filler flap: insert the key
into the ignition lock. Key
83Opening and closing Z

Problem
Possible causes/consequences and
M
MSolutions You can no longer lock or
unlock the vehicle using
KEYLESS-GO. KEYLESS-GO has been deactivated.
X Reactivate KEYLESS-GO (Y page 82). The key battery is weak or discharged.
X Check the key battery (Y page 84) and replace if necessary
(Y page 84).
If this does not work: X Lock or unlock the vehicle using the emergency key element
(Y page 89). Interference from a powerful source of radio waves.
X Lock or unlock the vehicle using the emergency key element
(Y page 89). Fault with KEYLESS-GO.
X Lock or unlock the vehicle using the remote control function of the
key.
X Have the vehicle and key checked at a qualified specialist work-
shop.
If the vehicle cannot be locked or unlocked even using the remote
control function:
X Lock or unlock the vehicle using the emergency key element
(Y page 89).
X Have the vehicle and key checked at a qualified specialist work-
shop. The engine cannot be
started using the key. The on-board voltage is too low.
X Switch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
X Check the starter battery and charge it if necessary (Y page 332).
or X Jump-start the vehicle (Y page 333).
or X Consult a qualified specialist workshop. The engine cannot be
started using the Start/
Stop button. The key is in
the vehicle. The vehicle is locked.
X Unlock the vehicle and try to start the vehicle again. The key battery is weak or discharged.
X Check the key battery (Y page 84) and replace if necessary
(Y page 84).
If this does not work: X Start your vehicle with the key in the ignition lock. Interference from a powerful source of radio waves.
X Start your vehicle with the key in the ignition lock. 86
KeyOpening and closing

Problems with the windscreen wipers
Problem
Possible causes/consequences and
M
MSolutions The windscreen wipers
are jammed. Leaves or snow, for example, are obstructing windscreen wiper move-
ment. The wiper motor has been deactivated.
X Switch off the engine.
X Remove the key from the ignition lock.
or, on vehicles with KEYLESS-GO or KEYLESS ‑GO start function:
X Open the driver's door.
The vehicle electronics now have status 0. This is the same as the
key having been removed.
X Remove the cause of the obstruction.
X Switch the windscreen wipers back on. The windscreen wipers
fail completely. The windscreen wiper drive is malfunctioning.
X Select another wiper speed on the combination switch.
X Have the windscreen wipers checked at a qualified specialist work-
shop. The windscreen washer
fluid from the spray noz-
zles no longer hits the
centre of the wind-
screen. The spray nozzles are misaligned.
X Have the spray nozzles adjusted at a qualified specialist workshop. 124
Windscreen wipersLights and windscreen wipers

for example, the power steering and the brake
boosting effect. You will require considerably
more effort to steer and brake. There is a risk of an accident.
Do not switch off the ignition while driving. G
WARNING
If the parking brake has not been fully
released when driving, the parking brake can:
R overheat and cause a fire
R lose its hold function.
There is a risk of fire and an accident. Release
the parking brake fully before driving off.
! Do not warm up the engine when the vehicle
is stationary. Drive off immediately. Avoid
high engine speeds and driving at full throttle
until the engine has reached its operating
temperature.
Only shift the automatic transmission to the
desired drive position when the vehicle is sta-
tionary.
Where possible, avoid spinning the drive
wheels when pulling away on slippery roads.
You could otherwise damage the drive train. Key positions
Key g
To remove the key
1 Power supply for some consumers, such as
the windscreen wipers
2 Ignition (power supply for all consumers)
and drive position
3 Starting the vehicle i
If the key does not belong to the vehicle, it
can still be turned in the ignition lock. How-
ever, the ignition will not be switched on. The
engine cannot be started.
Start/Stop button General notes
When you insert the Start/Stop button in the
ignition lock, the system needs approximately
two seconds of recognition time. You can then
use the Start/Stop button.
Pressing the Start/Stop button several times in succession corresponds to the different key
positions in the ignition lock. This is the case
only if you are not depressing the brake pedal.
If you depress the brake pedal and press the
Start/Stop button, the engine starts immedi-
ately.
A check that periodically establishes a radio
connection between the vehicle and the key
determines whether a valid key is in the vehicle.
This occurs, for example, when the engine is
started.
To start the vehicle without actively using the
key:
R the Start/Stop button must be inserted in the
ignition lock
R the key must be in the vehicle
R the vehicle must not be locked with the key or
KEYLESS-GO (Y page 82)
Do not keep the key:
R with electronic devices, e.g. a mobile phone
or another key
R with metallic objects, e.g. coins or metal foil
R inside metallic objects, e.g. a metal case
This can impair the key's function.
If you lock the vehicle with the key's remote
control or with KEYLESS-GO, after a short time:
R you will no longer be able to switch on the
ignition with the Start/Stop button
R you will no longer be able to start the engine
with the Start/Stop button until the vehicle is
unlocked again
If you lock the vehicle centrally using the button
on the front door (Y page 88), you can continue
to start the engine with the Start/Stop button.
You can switch off the engine while the vehicle is
in motion by pressing and holding the Start/
Stop button for around three seconds. This func- Driving
133Driving and parking Z

the engine running in enclosed spaces with-
out sufficient ventilation. G
WARNING
Flammable materials introduced through
environmental influence or by animals can
ignite if in contact with the exhaust system or parts of the engine that heat up. There is a risk
of fire.
Carry out regular checks to make sure that
there are no flammable foreign materials in
the engine compartment or in the exhaust
system.
General notes Vehicles with a petrol engine:
the catalytic
converter is preheated for up to 30 seconds
after a cold start. The sound of the engine may
change during this time.
Manual transmission X
Depress the brake pedal and keep it
depressed.
X Fully depress the clutch pedal.
X Engage neutral i.
Automatic transmission X
Shift the transmission to position j
(Y page 145).
The transmission position indicator on the
multifunction display shows j
(Y page 146).
i You can start the engine in transmission
position jand i.
Starting procedure using the key To start the engine using the key instead of the
Start/Stop button, pull the Start/Stop button
out of the ignition lock.
X To start a diesel engine: turn the key to
position 2in the ignition lock (Y page 133).
The % preglow indicator lamp on the
instrument cluster lights up.
X Turn the key to position 3in the ignition lock
(Y page 133) and release it as soon as the
engine is running. i
Vehicles with a diesel engine:
you can
start the engine without preglow if the engine
is warm.
If the engine will not start:
X Remove the key from the ignition lock.
X Reinsert the key in the ignition lock after wait-
ing for a short period.
X Turn the key to position 2in the ignition lock
(Y page 133).
The indicator lamps on the instrument cluster
light up (Y page 273).
X Turn the key to position 3in the ignition lock
(Y page 133) and release it as soon as the
engine is running.
Starting procedure using the Start/
Stop button The Start/Stop button is available only on vehi-
cles with KEYLESS-GO or the KEYLESS-GO start
function.
The Start/Stop button can be used to start the
vehicle manually without inserting the key in the ignition lock. The key must be in the vehicle and
the Start/Stop button must be inserted in the
ignition lock. This mode for starting the engine
manually operates independently of the ECO
start/stop automatic engine start function.
You can start the engine if a valid key is in the
vehicle. Switch off the engine and always take
the key with you when leaving the vehicle, even
if you leave it for only a short time. Observe the important safety notes.
X Depress the brake pedal and keep it
depressed.
X Press the Start/Stop button once
(Y page 133).
Vehicles with a petrol engine: the engine
starts.
Vehicles with a diesel engine: preglow is
activated and the engine starts. Pulling away
General notes G
WARNING
Vehicles with automatic transmission: Driving
135Driving an d parking
Z

Problem
Possible causes/consequences and
M
MSolutions The starter motor was exposed to excessively high thermal load.
X Start the engine again (Y page 134).
If the engine still does not start: X Consult a qualified specialist workshop. Vehicles with a petrol
engine:
The engine is not running
smoothly and is misfir-
ing. The engine electronics or a mechanical component of the engine
management system are/is malfunctioning.
X Depress the accelerator pedal only slightly.
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it.
X Have the cause rectified immediately at a qualified specialist work-
shop. The coolant temperature
display is showing more
than 120 †. A display
message may also
appear on the multifunc-
tion display and a warn-
ing tone may sound. The coolant level is too low. The coolant is too hot and the engine is not
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 312). 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 not being cooled sufficiently.
X If the coolant temperature is below 120 †, you can continue driving
to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in moun-
tainous terrain and stop-start traffic. DYNAMIC SELECT switch
Mercedes-AMG vehicles
General information Use the DYNAMIC SELECT switch to select the
drive program.
Available drive programs:
RACE
(S‑MODEL)
Driving characteristics suit-
able for a race circuit
S+
Sport Plus Particularly sporty driving
characteristics
S
Sport Sporty driving characteris-
tics
C
Comfort Comfortable and economi-
cal driving characteristics
I
Individual Individual settings Depending on the drive program selected, the
following vehicle characteristics will change:
R the engine management
R the transmission management
R the suspension
R the position of the exhaust flap
R the steering
R the availability of the ECO start/stop function
R climate control
R the driver assistance systems
R the availability of gliding mode
Further information for automatic drive program
characteristics (Y page 148).
Additionally, in drive program Iyou can config-
ure the respective vehicle characteristics via the
multimedia system. You can find information
about this in the Digital Owner's Manual.
If the ignition is switched off for less than four
hours, the previously selected drive program is DYNAMIC SELECT switch
141Driving and parking Z

Children could also set the vehicle in motion,
for example by:
R releasing the parking brake
R shifting the automatic transmission out of
park position P
R starting the engine.
There is a risk of an accident and injury.
When leaving the vehicle, always take the key with you and lock the vehicle. Never leave
children unattended in the vehicle. Always
keep the key out of reach of children.
X If the transmission is in position Dor R: push
the DIRECT SELECT lever up or down to the
first point of resistance.
X If the transmission is in position P: depress
the brake pedal and push the DIRECT SELECT lever up or down to the first point of resist-
ance.
If you switch the engine off with the transmis-
sion in position Ror D, the automatic transmis-
sion shifts to Nautomatically.
With the key: if you then open the driver's door
or the front-passenger door or remove the key
from the ignition, the automatic transmission
shifts to Pautomatically.
With the Start/Stop button: if you then open
the driver's door or the front-passenger door,
the automatic transmission shifts to Pautomat-
ically.
If you want the automatic transmission to
remain in neutral N, e.g. when having the vehicle
cleaned in an automatic car wash with a towing
system:
X Vehicles with KEYLESS-GO or KEYLESS-
GO start function:
remove the Start/Stop
button from the ignition lock.
X Insert the key into the ignition lock.
X All vehicles: switch the ignition on.
X Depress the brake pedal and keep it
depressed.
X Engage neutral N.
X Release the brake pedal.
X Release the electric parking brake.
X Switch off the ignition and leave the key in the
ignition lock. Engaging drive position D X
If the transmission is in position Ror N: push
the DIRECT SELECT lever down past the first
point of resistance.
X If the transmission is in position P: depress
the brake pedal and push the DIRECT SELECT lever down past the first point of resistance. Transmission position and drive pro-
gram display
The current transmission position and drive pro-
gram appear on the multifunction display. :
Status icon, drive program
; Transmission position
= Gear
The arrows in the transmission position display
show how and into which transmission positions
you can shift using the DIRECT SELECT lever.
If the transmission position display on the mul-
tifunction display is not working, you should pull away carefully to check whether the desired
transmission position is engaged. Ideally, you
should select transmission position Dand drive
program E(drive program Cin Mercedes-AMG
vehicles) or S.146
Automatic transmissionDriving and parking

Transmission positions
B Park position
This secures the vehicle against roll-
ing away when stopped.
Only shift the transmission to posi-
tion
Pwhen the vehicle is stationary
(Y page 145). The parking lock
should not be used as a brake when
parking. In order to secure the vehi-
cle, always apply the electric parking brake in addition to the parking lock.
Park position Pis automatically
engaged if:
R you switch off the engine using the
key and remove the key
R you switch off the engine using the
key or using the Start/Stop button
and open the driver's door or front- passenger door
R you open the driver's door when
the vehicle is stationary or when
driving at a very low speed and the
transmission is in position Dor R
In the event of a malfunction of the
vehicle's electronics, the transmis-
sion may lock in position P. Have the
vehicle electronics checked immedi-
ately at a qualified specialist work-
shop. C Reverse gear
You can shift the transmission to
position
Ronly when the vehicle is
stationary (Y page 145). A Neutral
Do not shift the transmission to
N
while driving. Otherwise, the auto-
matic transmission could be dam-
aged.
No power is transmitted from the
engine to the drive wheels.
Releasing the brake pedal will allow
you to move the vehicle freely, e.g. to push it or tow it.
If ESP ®
is deactivated or faulty: shift
the transmission to position Nif the
vehicle is in danger of skidding, e.g.
on icy roads.
If you switch the engine off with the
transmission in position Ror D, the
automatic transmission shifts to N
automatically.
! Rolling in neutral
Ncan lead to
damage to the transmission. 7 Drive
The automatic transmission changes
gear automatically. All forward gears
are available. Driving tips
Changing gear The automatic transmission shifts to the indi-
vidual gears automatically when it is in trans-
mission position
D. Gearshifting is determined
by:
R the selected drive program
R the position of the accelerator pedal
R the road speed
Accelerator pedal position Your driving style influences how the automatic
transmission shifts gear:
R little throttle: early upshifts
R more throttle: late upshifts
Double-clutch function When shifting down, the double-clutch function
is active regardless of the drive program. The
double-clutch function reduces load change Automatic transmission
147Driving and parking Z

Problems with the transmission
Problem
Possible causes/consequences and
M
MSolutions The transmission has
problems shifting gear. The transmission is losing oil.
X Have the transmission checked at a qualified specialist workshop
immediately. The acceleration charac-
teristics are deteriorat-
ing.
The transmission no lon-
ger changes gear. The transmission is in emergency mode.
It is possible to shift only into
secondgear and reverse gear.
X Stop.
X Shift the transmission to position P.
X Switch off the engine.
X Wait at least ten 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 workshop
immediately. Transfer case
This section only applies to vehicles with all-
wheel drive (4MATIC). The front and rear axles
are constantly driven.
! Performance tests may only be carried out
on a two-axle roller dynamometer. Otherwise,
the braking system or the transfer case could be damaged. Contact a qualified specialist
workshop for more information on perform-
ance tests.
! Since ESP ®
engages automatically, the igni-
tion must be switched off (the key or Start/
Stop button must be in position 0or 1) if:
R the electric parking brake is being tested
using a brake dynamometer.
R the vehicle is being towed with only one
axle raised (not permitted for vehicles with
4MATIC).
The brake system could otherwise be dam-
aged.
! Vehicles with 4MATIC must not be towed
with the front or rear axle raised; otherwise,
the transmission may be damaged. Refuelling
Important safety notes
G
WARNING
Fuel is highly flammable. If you handle fuel
incorrectly, there is a risk of fire and explo-
sion.
You must avoid fire, naked flames, creating
sparks and smoking. Switch off the engine
and, if applicable, the auxiliary heating before refuelling. G
WARNING
Fuels are poisonous and hazardous to health. There is a danger of injury.
Do not swallow fuel or let it come into contact
with skin, eyes or clothing. Do not inhale fuel
vapours. Keep fuels out of the reach of chil-
dren. Refuelling
153Driving and parking
Z