check engine light MERCEDES-BENZ C CLASS 2016 Owners Manual

Problem with the rear window
defroster ....................................... .1 37
Problems with cooling with air
dehumidification ............................ 133
Rear control panel ......................... 131
Refrigerant ..................................... 393
Refrigerant filling capacity ............. 394
Setting the air distribution ............. 134
Setting the air vents ..................... .1 43
Setting the airflow ......................... 135
Setting the climate mode .............. .1 34
Setting the climate mode (multi-
media system) ............................... 303
Setting the temperature ................ 134
Switching air-recirculation mode
on/off ............................................ 137
Switching on/off ........................... 132
Switching residual heat on/off ...... 137
Switching the rear window
defroster on/off ............................ 136
Switching the synchronization
function on and off ........................ 135
Synchronization function (multi-
media system) ............................... 304
Climate control settings
Multimedia system ........................ 302
Climate control system
Climate control (3-zone automatic
climate control) ............................ .1 32
Cockpit
Overview .......................................... 35
COLLISION PREVENTION ASSIST
PLUS
Activating/deactivating ................. 247
Display message ............................ 261
Operation/notes .............................. 70
COMAND display
Cleaning ......................................... 340
Combination switch .......................... 119
Connecting a USB device
see also Digital Operator's Man-
ual ................................................. .2 98
Consumption statistics (on-board
computer) .......................................... 240
Controller .......................................... .2 99
Convenience box ............................... 314
Convenience closing feature .............. 96 Convenience open ing feature ............ 96
Coolant (engine)
Checking the level ......................... 333
Display message ............................ 268
Displaying the temperature (on-
board computer) ............................ 246
Filling capacity ............................... 393
Important safety notes .................. 392
Temperature display in the instru-
ment cluster .................................. 236
Warning lamp ................................. 293
Cooling
see Climate control
Copyright ............................................. 34
Cornering light function
Display message ............................ 267
Function/notes ............................ .1 20
Crosswind Assist ................................. 76
Cruise control
Cruise control lever ....................... 185
Deactivating ................................... 186
Display message ............................ 279
Driving system ............................... 185
Function/notes ............................ .1 85
General notes ................................ 185
Important safety notes .................. 185
Setting a speed .............................. 186
Storing and maintaining current
speed ............................................. 185
Storing the current speed or call-
ing up the last stored speed .......... 186
Cup holder
Center console .............................. 316
Important safety notes .................. 316
Rear compartment ......................... 317
Customer Assistance Center
(CAC) ..................................................... 32
Customer Relations Department ....... 32
D
Data
see Technical data
Data carrier
Selecting ........................................ 244
Daytime running lamps
Display message ............................ 267
Function/notes ............................. 118 Index 7

Starting problems .......................... 153
Starting the engine with the
SmartKey ....................................... 148
Starting via smartphone ................ 149
Starting with the Start/Stop but-
ton ................................................. 148
Switching off .................................. 177
Tow-starting (vehicle) ..................... 357
Engine electronics
Problem (malfunction) ................... 153
Engine oil
Adding ........................................... 332
Additives ........................................ 392
Checking the oil level ..................... 331
Checking the oil level using the
dipstick .......................................... 332
Display message ............................ 270
Filling capacity ............................... 391
General notes ................................ 391
Notes about oil grades ................... 391
Notes on oil level/consumption .... 331
Temperature (on-board computer,
Mercedes-AMG vehicles) ............... 252
Entering an address
see also Digital Operator's Man-
ual .................................................. 298
ESP ®
(Electronic Stability Pro-
gram)
AMG menu (on-board computer) ... 253
Characteristics ................................. 73
Crosswind Assist ............................. 76
Deactivating/activating (button
in Mercedes-AMG vehicles) ............. 74
Deactivating/activating (except
Mercedes ‑ AMG vehicles) ................. 74
Deactivating/activating (on-
board computer, except
Mercedes-AMG vehicles) ............... 247
Display message ............................ 256
Function/notes ................................ 73
General notes .................................. 73
Important safety information ........... 73
Trailer stabilization ........................... 76
Warning lamp ................................. 290
ETS/4ETS (Electronic Traction Sys-
tem) ...................................................... 73
Exhaust
see Exhaust pipe Exhaust check ................................... 180
Exhaust pipe
Cleaning ......................................... 340
Exhaustive discharging (high-volt-
age battery) ....................................... 349
Exterior lighting
Cleaning ......................................... 338
se e
Lights
Exterior mirrors
Adjusting ....................................... 113
Dipping (automatic) ....................... 114
Folding in/out (automatically) ....... 114
Folding in/out (electrically) ........... 114
Out of position (troubleshooting) ... 114
Setting ........................................... 114
Storing settings (memory func-
tion) ............................................... 116
Storing the parking position .......... 115
Eyeglasses compartment ................. 309
F Favorites
Overview ........................................ 301
Features ............................................. 316
Filler cap
see Refueling
Flat tire
Changing a wheel/mounting the
spare wheel ................................... 379
MOExtended tires .......................... 343
Preparing the vehicle ..................... 343
TIREFIT kit ...................................... 344
Floormats ........................................... 329
Frequencies
Mobile phone ................................. 386
Two-way radio ................................ 386
Fuel
Additives ........................................ 390
Consumption statistics .................. 240
Displaying the current consump-
tion ................................................ 240
Displaying the range ...................... 240
Driving tips .................................... 180
Flexible fuel vehicles ...................... 390
Fuel gauge ....................................... 36
Grade (gasoline) ............................ 389
Important safety notes .................. 38910
Index

Hybrid vehicles
General notes Hybrid technology combines a fuel efficient
internal combustion engine with a powerful
electric motor.
Important safety notes
Danger of electric shock
G DANGER
The vehicle's high-voltage electrical system is
under high voltage. If you modify components
in the vehicle's high-voltage electrical system
or touch damaged components, you may be
electrocuted. The components in the vehi-
cle's high-voltage electrical system may be
damaged in an accident, although the damage
is not visible. There is a risk of fatal injury.
Following an accident, do not touch any high-
voltage components and never modify the
vehicle's high-voltage electrical system. Have
the vehicle towed away after an accident and
the vehicle's high-voltage electrical system
checked by a qualified specialist workshop.
When towing a vehicle after an accident, be sure
to observe the following sections: R
Transporting the vehicle ( Y
page 356)R
Towing the vehicle with the rear axle raised
( Y
page 355)R
Towing a vehicle with both axles on the
ground ( Y
page 356)
Read the safety instructions on towing and tow-
starting ( Y
page 354). All components of the hybrid drive system are
marked with yellow warning stickers that warn
you of the danger of high voltage. The cables of
the vehicle's high-voltage electrical system are
orange in color.
The ignition must be switched off when carrying
out general tasks, such as changing bulbs or
checking the coolant level.
Automatic switching off of the hybrid
drive system If components of the restraint system are acti-
vated during an accident, the hybrid drive sys-
tem is automatically deactivated.
The hybrid drive system is not activated when
the vehicle is started if: R
an electrical short circuit is detected in the
hybrid drive system R
an electrical connection in the hybrid drive
system is disconnected
This ensures that you do not come into contact
with high voltage.
Manual switching off of the hybrid drive
system The hybrid drive system can be deactivated
manually using the high voltage switch-off
device.
! To prevent damage to the hybrid drive sys-
tem please observe the following instruc-
tions: R
only deactivate the hybrid drive system
manually in the following situations. R
work on the hybrid drive system may only
be carried out at a qualified specialist work-
shop, even when it has been deactivated
manually.
Deactivate the hybrid system manually if: R
the u restraint system warning lamp in the
instrument cluster lights up after an accident R
the vehicle is badly damaged, e.g. after an
accident, and the restraint system compo-
nents were not activated R
the vehicle is badly damaged and has to be
towed or transported44
Hybrid vehicles
Safety

regular intervals while the engine is running.
Therefore, malfunctions can be detected in
good time.
The u restraint system warning lamp in the
instrument cluster lights up when the ignition is
switched on. It goes out no later than a few sec-
onds after the vehicle is started. The compo-
nents of the restraint system are in operational
readiness.
A malfunction has occurred if the u restraint
system warning lamp: R
does not light up after the ignition is switched
on R
does not go out after a few seconds with the
engine running R
lights up again while the engine is running
All vehicles, except hybrid vehicles:
G WARNING
If restraint system is malfunctioning, restraint
system components may be triggered unin-
tentionally or might not be triggered at all in
the event of an accident with a high rate of
vehicle deceleration. This can affect the Emer-
gency Tensioning Device or air bag, for exam-
ple. This poses an increased risk of injury or
even fatal injury.
Have the restraint system checked and
repaired in a qualified specialist workshop as
soon as possible.
Hybrid vehicles:
G DANGER
If the restraint system is malfunctioning, indi-
vidual restraint system components may be
triggered unintentionally or might not be trig-
gered at all in the event of an accident with a
high rate of vehicle deceleration. This could
affect Emergency Tensioning Devices or air
bags, for example. The vehicle's high-voltage
electrical system may also not be deactivated
as intended in the event of an accident. You
could suffer an electric shock if you touch the
damaged components of the vehicle's high-
voltage electrical system. This poses an
increased risk of injury or even fatal injury.
Have the restraint system checked and
repaired immediately at a qualified specialist workshop. Immediately switch off the ignition
and remove the SmartKey from the ignition
lock after an accident.
PASSENGER AIR BAG indicator lamp
PASSENGER AIR BAG ON indicator lamp C and
PASSENGER AIR BAG OFF indicator lamp D are
part of the Occupant Classification System
(OCS).
The indicator lamps display the status of the
front-passenger front air bag. R
PASSENGER AIR BAG ON lights up: the front-
passenger front air bag is enabled. If, in the
event of an accident, all deployment criteria
are met, the front-passenger front air bag is
deployed. R
PASSENGER AIR BAG OFF lights up: the front-
passenger front air bag is deactivated. It will
then not be deployed in the event of an acci-
dent.
Depending on the person in the front-passenger
seat, the front-passenger front air bag must
either be deactivated or enabled; see the fol-
lowing points. You must make sure of this both
before and during a journey. R
Children in a child restraint system:
whether the front-passenger front air bag is
enabled or deactivated depends on the instal-
led child restraint system, and the age and
size of the child. Therefore, be sure to observe
the notes on the "Occupant Classification
System (OCS)" ( Y
page 54) and on "Chil-
dren in the vehicle" ( Y
page 62). There you
will also find instructions on rearward and
forward-facing child restraint systems on the
front-passenger seat. R
All other persons: depending on the classi-
fication of the person in the front-passengerOccupant safety 47
Safety Z

Important safety notes If you fail to adapt your driving style or if you are
inattentive, th e driving safet y systems can nei-
ther reduce th e ris k of an acciden t no r override
th e laws of physics . Drivin g safet y systems are
merely aids designed to assist driving . You are
responsible for maintainin g th e distanc e to th e
vehicl e in front, for vehicl e speed, for braking in
goo d time, and for staying in lane. Always adapt
your driving style to suit th e prevailing road and
weather condition s and maintai n a saf e distanc e
from th e vehicl e in front. Drive carefully.
The driving safet y systems describe d only wor k
as effectivel y as possible when there is ade-
quat e contact between th e tires and th e road
surface. Pay particular attention to th e informa-
tion regarding tires , recommended minimum
tire tread depths etc. in th e "Wheels and tires "
section ( Y
page 360).
In wintr y driving conditions, always use winte r
tires (M+ S tires )a nd if necessary, snow chains.
Only in this way will the driving safety systems
described in this section work as effectively as
possible.
ABS (Anti-lock Braking System)
General information ABS regulates brake pressure in such a way that
the wheels do not lock when you brake. This
allows you to continue steering the vehicle when
braking.
The % ABS warning lamp in the instrument
cluster lights up when the ignition is switched
on. It goes out when the engine is running.
ABS works from a speed of about 5 mph
(8 km/h), regardless of road-surface conditions.
ABS works on slippery surfaces, even when you
only brake gently.
Important safety notes
i Observe the "Important safety notes" sec-
tion ( Y
page 68).
G WARNING
If ABS is faulty, the wheels could lock when
braking. The steerability and braking charac-
teristics may be severely impaired. Addition-
ally, further driving safety systems are deac- tivated. There is an increased danger of skid-
ding and accidents.
Drive on carefully. Have ABS checked imme-
diately at a qualified specialist workshop.
When ABS is malfunctioning, other systems,
including driving safety systems, will also
become inoperative. Observe the information
on the ABS warning lamp ( Y
page 289) and dis-
play messages which may be shown in the
instrument cluster ( Y
page 256).
Braking X
If ABS intervenes: continue to depress the
brake pedal vigorously until the braking sit-
uation is over. X
To make a full brake application: depress
the brake pedal with full force.
If ABS intervenes when braking, you will feel a
pulsing in the brake pedal.
The pulsating brake pedal can be an indication
of hazardous road conditions, and functions as a
reminder to take extra care while driving.
BAS (Brake Assist System)
General information BAS operates in emergency braking situations.
If you depress the brake pedal quickly, BAS
automatically boosts the braking force, thus
shortening the stopping distance.
Important safety notes
i Observe the "Important safety notes" sec-
tion ( Y
page 68).
G WARNING
If BAS is malfunctioning, the braking distance
in an emergency braking situation is
increased. There is a risk of an accident.
In an emergency braking situation, depress
the brake pedal with full force. ABS prevents
the wheels from locking.68
Driving safety systems
Safety

You will receive visual and acoustic locking con-
firmation if all components were able to be
locked.
When the locator lighting is activated via the
multimedia system, it lights up when it is dark
after the vehicle is unlocked with the SmartKey
(see the Digital Operator's Manual). X
To open the trunk lid automatically from
outside the vehicle: press and hold the T
button until the trunk lid opens. X
To open the trunk lid automatically from
outside the vehicle: if the SmartKey is loca-
ted in the immediate vicinity of the vehicle,
press the T button on the SmartKey.
When the trunk lid closes you can then
release the button.
KEYLESS-GO
General notes Bear in mind that the engine can be started by
any of the vehicle occupants if there is a Smart-
Key in the vehicle.
Locking/unlocking centrally You can start, lock or unlock the vehicle using
KEYLESS-GO. To do this, you only need carry the
SmartKey with you. You can combine the func-
tions of KEYLESS-GO with those of a conven-
tional SmartKey. Unlock the vehicle by using
KEYLESS-GO, for instance, and lock it using the
7 button on the SmartKey.
The driver's door and the door at which the han-
dle is used, must both be closed. The SmartKey
must be outside the vehicle. When locking or
unlocking with KEYLESS-GO, the distance
between the SmartKey and the corresponding
door handle must not be greater than 3 ft (1 m).
A brief radio connection between the vehicle
and the key determines whether a valid Smart-
Key is in, or in the direct vicinity of, the vehicle.
This occurs, for example: R
when starting the engine R
while driving R
when using HANDS-FREE ACCESS 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 C
or D .
Make sure that you do not touch the inner
surface of the door handle. X
Convenience closing feature: touch
recessed sensor surface D for an extended
period.
Further information on the convenience clos-
ing feature ( Y
page 96). X
To unlock the trunk lid: pull the handle on
the trunk lid.
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 SmartKey. The SmartKey will
then use very little power, thereby conserving
battery power. For the purposes of activation/
deactivation, the vehicle must not be nearby. X
To deactivate: press the 7 button on the
SmartKey twice in rapid succession.
The battery check lamp of the SmartKey
flashes twice briefly and lights up once, then
KEYLESS-GO is deactivated ( Y
page 84).X
To activate: press any button on the Smart-
Key.
or X
Insert the SmartKey into the ignition lock.
KEYLESS-GO and all of its associated features
are available again.82
SmartKey
Opening and closing

Problem
Possible causes/consequences and P Solutions
The engine cannot be
started using the Smart-
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 350).
or X
Jump-start the vehicle ( Y
page 352).
or X
Consult a qualified specialist workshop.
The engine cannot be
started using the Start/
Stop button. The Smart-
Key is in the vehicle. The vehicle is locked. X
Unlock the vehicle and try to start the vehicle again.
The SmartKey battery is discharged or nearly discharged. X
Check the SmartKey battery ( Y
page 84) and replace it if necessary
( Y
page 84).
If this does not work: X
Start your vehicle with the SmartKey in the ignition lock.
There is interference from a powerful source of radio waves. X
Start your vehicle with the SmartKey in the ignition lock.
You have lost a Smart-
Key. X
Have the SmartKey deactivated at a qualified specialist workshop. X
Report the loss immediately to the vehicle insurers. X
If necessary, have the locks changed as well.
You have lost the
mechanical key. X
Report the loss immediately to the vehicle insurers. X
If necessary, have the locks changed as well.
Doors
Important safety notes
G WARNING
If children are left unsupervised in the vehicle,
they could: R
open the doors, thus endangering other
people or road users. R
get out and disrupt traffic. R
operate the vehicle's equipment. Additionally, children could set the vehicle in
motion if, for example, they: R
release the parking brake. R
shifting the automatic transmission out of
park position P R
Start the engine.
There is a risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children. Doors 87
Opening and closing Z

Problems with the windshield wipers Problem
Possible causes/consequences and P Solutions
The windshield wipers
are jammed. Leaves or snow, for example, may be obstructing the windshield wiper
movement. The wiper motor has been deactivated. X
For safety reasons, you should remove the SmartKey from the igni-
tion 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 windshield wipers back on.
The windshield wipers
fail completely. The windshield wiper drive is malfunctioning. X
Select another wiper speed on the combination switch. X
Have the windshield wipers checked at a qualified specialist work-
shop.
The windshield washer
fluid from the spray noz-
zles no longer hits the
center of the windshield. The spray nozzles are misaligned. X
Have the spray nozzles adjusted at a qualified specialist workshop.128
Windshield wipers
Lights and windshield wipers

Starting the engine
Important safety notes
G WARNING
If children are left unsupervised in the vehicle,
they could: R
open the doors, thus endangering other
people or road users. R
get out and disrupt traffic. R
operate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they: R
release the parking brake. R
shifting the automatic transmission out of
park position PR
Start the engine.
There is a risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
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.
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.
! Do not depress the accelerator when start-
ing the engine. General notes The catalytic converter is preheated for up to
30 seconds after a cold start. The sound of the
engine may change during this time.
Automatic transmission X
Shift the transmission to position P
( Y
page 156).
The transmission position display in the mul-
tifunction display shows P ( Y
page 157).
i You can start the engine in transmission
position P and N .
Starting procedure with the SmartKey To start the engine using the SmartKey instead
of the Start/Stop button, pull the Start/Stop
button out of the ignition lock. X
Turn the SmartKey to position 3 in the ignition
lock and release it as soon as the engine is
running ( Y
page 146).
If the engine will not start: X
Remove the SmartKey from the ignition lock. X
Reinsert the SmartKey into the ignition lock
after a short waiting period. X
Turn the SmartKey to position 2 in the ignition
lock ( Y
page 146).
The indicator lamps in the instrument cluster
light up ( Y
page 286). X
Turn the SmartKey to position 3 in the ignition
lock ( Y
page 146) and release it as soon as the
engine is running.
Starting procedure with the Start/Stop
button The Start/Stop button is only available 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 SmartKey
into the ignition lock. The Start/Stop button
must be inserted in the ignition lock and the
SmartKey must be in the vehicle. This mode for
starting the engine operates independently of
the ECO start/stop automatic engine start func-
tion.
You can start the engine if a valid SmartKey is in
the vehicle. Switch off the engine and always
take the SmartKey with you when leaving the148
Driving
Driving and parking

Problems with the engine Problem
Possible causes/consequences and P Solutions
The engine does not
start. The starter motor
can be heard. R
There is a malfunction in the engine electronics. R
There is a malfunction in the fuel supply.
Before attempting to start the engine again: X
Turn the SmartKey back to position 0 in the ignition lock.
or X
Press the Start/Stop button repeatedly until all indicator lamps in
the instrument cluster go out. X
Try to start the engine again ( Y
page 148). Avoid excessively long
and frequent attempts to start the engine as these will drain the
battery.
If the engine does not start after several attempts: X
Consult a qualified specialist workshop.
The engine does not
start. You cannot hear
the starter motor. The on-board voltage is too low because the battery is too weak or
discharged. X
Jump-start the vehicle ( Y
page 352).
If the engine does not start despite attempts to jump-start it: X
Consult a qualified specialist workshop.
The starter motor was exposed to a thermal load that was too high. X
Try to start the engine again ( Y
page 148).
If the engine still does not start: X
Consult a qualified specialist workshop.
The engine is not running
smoothly and is misfir-
ing. 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.
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
gauge shows a value
above 248 ‡ (120 †). 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 333). Observe the warning notes
as you do so and add coolant if necessary. Driving 153
Driving and parking Z