check engine light MERCEDES-BENZ CLA COUPE 2016 User Guide

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.
General notes Vehicles with a petrol engine:
the engine runs
at a higher engine speed during the cold start
procedure so that the catalytic converter can
reach operating temperature more quickly. The
sound of the engine may change as a result.
Manual transmission You can only start the engine when the clutch
pedal is fully depressed.
X Depress the brake pedal and keep it
depressed.
X Depress the clutch pedal fully.
X Shift to neutral N.
Automatic transmission X
Shift the transmission to position
P(Y page 144).
The transmission position indicator in the
multifunction display shows P(Y page 144).
i You can start the engine in transmission
position Pand N. 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 in the instru-
ment cluster lights up.
X Turn the key to position 3(Y page 133) in the
ignition lock and release it as soon as the
engine is running.
Starting procedure using the Start/
Stop button 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 only leave it for a short time. Pay attention
to the important safety notes.
X Vehicles with automatic transmission:
depress the brake pedal and keep it
depressed.
X Vehicles with manual transmission:
depress the clutch 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:
If the engine speed is above the engine idling speed and you then engage transmission Driving
135Driving and parking
Z

Problem
Possible causes/consequences and
M
MSolutions The engine does not
start. The starter motor
is turning audibly. The
reserve fuel warning
lamp is lit and the fuel
gauge display shows 0. The fuel tank is empty.
X Refuel the vehicle. The engine does not
start. The starter motor
is not turning audibly. The on-board voltage is too low because the battery is too weak or
discharged.
X Jump-start the vehicle (Y page 301).
If the engine does not start despite attempts to jump-start it:
X Consult a qualified specialist workshop. The starter motor was exposed to excessively high thermal load.
X Allow the starter motor to cool down for approximately two minutes.
X Try to start the engine again.
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 †. The coolant warning lamp may also
be on and a warning 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 283). 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. 140
DrivingDriving and parking

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 the Start-Stop button:
remove the Start-Stop button from the igni-
tion 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 Shift to 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. Electric parking brake
General notes G
WARNING
If you leave children unattended in the vehi-
cle, they may be able to set the vehicle in
motion if, for example, they:
R release the parking brake
R shift the automatic transmission out of park
position Por shift manual transmission into
neutral
R start the engine
In addition, they may operate vehicle equip-
ment and become trapped. 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. The function of the electric parking brake is
dependent on the on-board voltage. If the on-
board voltage is low or if there is a malfunction
in the system, it may not be possible to apply the
released parking brake.
X If this is the case, park the vehicle only on
level ground and secure it to prevent it from
rolling away.
X Vehicles with automatic transmission:
shift the automatic transmission to position
P.
X Vehicles with manual transmission:
engage first gear.
It may not be possible to release an applied
parking brake if the on-board voltage is low or if
there is a malfunction in the system. Contact a
qualified specialist workshop.
The electric parking brake carries out a function check at regular intervals when the engine is
switched off. Noises that occur are normal.
Applying or releasing manually X
To apply: push handle :.
When the electric parking brake is applied,
the red !indicator lamp lights up in the
instrument cluster.
The electric parking brake can also be applied when the key is removed.
X To release: pull handle:.
The red !indicator lamp in the instrument
cluster goes out.
The electric parking brake can be released
only:
R when the key is in position 1or 2in the
ignition lock (Y page 133) or
R if the ignition was switched on using the
Start/Stop button Parking
157Driving and parking Z

engine. This relieves the load on the brake sys-
tem and prevents the brakes from overheating
and wearing too quickly.
When the engine is running, you can use the
cruise control lever to limit the speed to any
speed between 30 km/h and the technically
permitted maximum speed of the vehicle. If the
set value of the permanent limiter is lower, then this value applies (Y page 166).
Use cruise control only if road and traffic con-
ditions are appropriate for maintaining a steady speed for a prolonged period.
The speed indicated in the speedometer may
differ slightly from the speed stored.
Important safety notes If you fail to adapt your driving style, cruise con-
trol can neither reduce the risk of an accident
nor override the laws of physics. Cruise control
cannot take into account road, weather or traffic conditions. Cruise control is only an aid. You are
responsible for the distance to the vehicle in
front, for vehicle speed, for braking in good time and for staying in lane.
Do not use cruise control:
R in road and traffic conditions which do not
allow you to maintain a constant speed, e.g. in
heavy traffic or on winding roads.
R on smooth or slippery roads. Braking or accel-
erating can cause the drive wheels to lose
traction and the vehicle could then skid.
R in poor visibility, e.g. due to fog, heavy rain or
snow.
If a new driver takes over, advise the new driver
of the speed stored.
Cruise control lever :
To activate or increase speed
; LIM indicator lamp =
To activate at the current speed/last stored
speed
? To activate or reduce speed
A To switch between cruise control and the
variable speed limiter
B To deactivate cruise control
You can operate cruise control and the variable speed limiter with the cruise control lever.
The LIM indicator lamp on the cruise control
lever indicates which system you have selected:
R LIM indicator lamp off: cruise control is
selected
R LIM indicator lamp on: variable limiter is
selected.
When you activate cruise control, the stored
speed is shown in the multifunction display for
five seconds.
Selecting cruise control X
To select cruise control: check whether LIM
indicator lamp ;is on or off.
If it is off, cruise control is already selected.
X 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.
Activation conditions To activate cruise control, all of the following
activation conditions must be fulfilled:
R the electric parking brake must be released.
R you are driving faster than 30 km/h.
R ESP ®
must be switched on, but not interven-
ing.
R on vehicles with automatic transmission, the
selector lever must be in position D.
R on vehicles with manual transmission, a gear
must be engaged.
R cruise control must be selected.
Storing, maintaining and calling up a
speed Storing and maintaining the current
speed
You can store the current speed if you are driv-
ing faster than 30 km/h. Driving systems
163Driving and parking Z

If cruise control is deactivated, you will hear a
warning tone. You will see the Cruise con‐
Cruise con‐
trol off
trol off message in the multifunction display
for approximately five seconds.
i The last speed stored is cleared when you
switch off the engine. Speed limiter
General notes The limiter restricts the speed of the vehicle. The
limiter brakes automatically in order to adjust
the vehicle's speed to the stored speed.
You must select a lower gear in good time on
long and steep downhill gradients, especially if
the vehicle is laden or towing a trailer. On vehi-
cles with automatic transmission, you need to
have selected the manual drive program
M (Y page 150). By doing so, you will make use
of the braking effect of the engine. This relieves
the load on the brake system and prevents the
brakes from overheating and wearing too
quickly.
You can set a variable or permanent limit speed:
R Variable for maximum permissible speeds,
e.g. in built-up areas
R Permanent for a technically permitted max-
imum vehicle speed, e.g. when driving with
winter tyres fitted (Y page 166)
i The speed indicated in the speedometer
may differ slightly from the stored maximum
permissible speed.
Important safety notes If you fail to adapt your driving style, the speed
limiter can neither reduce the risk of an accident
nor override the laws of physics. The limiter can-
not take into account road, weather or traffic
conditions. The limiter is only an aid. You are
responsible for the distance to the vehicle in
front, for vehicle speed, for braking in good time
and for staying in lane.
If a new driver takes over, advise the new driver of the speed stored. Variable speed limiter General notes
:
Activates or increases speed
; LIM indicator lamp
= Activates at the current speed/last stored
speed
? Activates or reduces speed
A Switches between cruise control and the
variable speed limiter
B Switches off the speed limiter
With the cruise control lever, you can operate
cruise control or Distance Pilot DISTRONIC and
the variable speed limiter.
The LIM indicator lamp on the cruise control
lever indicates which system you have selected:
R LIM indicator lamp off: cruise control or Dis-
tance Pilot DISTRONIC is selected.
R LIM indicator lamp on: variable speed lim-
iter is selected.
When the engine is running, you can use the
cruise control lever to limit the speed to any
speed between 30 km/h and the maximum
design speed of the vehicle. If the set value of
the permanent limiter is lower then this value
applies (Y page 166).
Selecting the variable speed limiter
X Check whether LIM indicator lamp ;is on.
If it is on, the variable speed limiter 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. The variable limiter is selected. Driving systems
165Driving and parking Z

up to a speed of 30 km/h. At speeds above
30 km/h, the indicator lamp goes out and Blind
Spot Assist is operational.
If a vehicle is detected within the monitoring
range of Blind Spot Assist at speeds above
30 km/h, warning lamp :on the correspond-
ing side lights up red. This warning always
occurs when a vehicle enters the blind spot
monitoring range from behind or 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 deac- tivated.
The brightness of the indicator/warning lamps
is adjusted automatically according to the ambi-
ent light.
Collision warning
If a vehicle is detected in the blind spot moni-
toring range and you switch on the correspond-
ing turn signal, a double warning tone sounds.
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.
Activating Blind Spot Assist X Make sure that Blind Spot Assist is activated
in the on-board computer (Y page 209).
X Turn the key to position 2in the ignition lock.
Warning lamps :in the exterior mirrors light
up red for approximately 1.5 seconds and
then turn yellow.
Towing a trailer
If you couple up a trailer, make sure that you
have correctly established the electrical con-
nection. This can be accomplished by checking
the trailer lighting. Blind Spot Assist is then
deactivated. The indicator lamps in the exterior
mirrors light up yellow and the Blind Spot
Blind Spot
Assist not available when towing a Assist not available when towing a
trailer See Owner's Manual trailer See Owner's Manual message
appears in the multifunction display.
i You can deactivate the indicator lamps in
the exterior mirrors. To do so, you will need to deactivate 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 General notes
Lane Keeping Assist monitors the area in front of
your vehicle by means of multifunction cam-
era :attached at the top of the windscreen.
Lane Keeping Assist detects lane markings on
the road and can warn you before you leave your lane unintentionally.
This function is available in a speed range
between 60 km/h and 200 km/h.
A warning may be given if a front wheel passes
over a lane marking. It will warn you by means of intermittent vibration through the steering
wheel for up to 1.5 seconds.
Important safety notes G
WARNING
Lane Keeping Assist cannot always clearly
identify lane markings.
In these cases, Lane Keeping Assist may:
R give an unnecessary warning
R not give a warning
There is a risk of an accident.
Always pay particular attention to the traffic
situation and keep in lane, especially if Lane
Keeping Assist alerts you. Driving systems
193Driving and parking Z

Important safety notes
G
WARNING
Operating the integrated information systems and communications equipment in the vehicle
while driving will distract you from traffic con-
ditions. You could then lose control of the
vehicle. There is a risk of an accident.
Only operate these devices if road traffic con-
ditions permit. If you are unsure about the
surrounding conditions, pull over to a safe
location and make entries only while the vehi-
cle is stationary.
You must observe the legal requirements for the country in which you are currently driving whenoperating the on-board computer. G
WARNING
If the instrument cluster has failed or mal-
functioned, you may not recognise function
restrictions relevant to safety. The operating
safety of your vehicle may be impaired. There is a risk of an accident.
Drive on carefully. Have the vehicle checked
at a qualified specialist workshop immedi-
ately.
The on-board computer only shows messages or warnings from certain systems in the multifunc-tion display. You should therefore make sure
your vehicle is operating safely at all times.
If the operating safety of your vehicle is
impaired, park the vehicle safely as soon as pos- sible. Contact a qualified specialist workshop.
For an overview, see the instrument panel illus-
tration (Y page 32). Displays and operation
Instrument cluster lighting
The light sensor in the instrument cluster auto-
matically controls the brightness of the multi-
function display. In daylight, the displays in the
instrument cluster are not illuminated.
The lighting in the instrument cluster, in the dis- plays and the controls in the vehicle interior can
be adjusted using the brightness control knob. The brightness control knob is located on the
bottom left of the instrument cluster
(Y
page 32).
X Turn the brightness control knob clockwise or
anti-clockwise.
If the light switch is set to the Ã,Tor
L position, the brightness is dependent
upon the brightness of the ambient light. Speedometer with segments
The speedometer is divided into segments on
vehicles with Distance Pilot DISTRONIC.
The segments in the speedometer indicate
which speed range is available. R Variable speed limiter is activated
(Y page 165):
The segments light up from the start of the
scale to the selected speed limitation.
R Distance Pilot DISTRONIC is activated
(Y page 167):
One or two segments in the stored speed
range light up.
R Distance Pilot DISTRONIC detects a vehicle in
front moving more slowly than the stored
speed:
The segments between the speed of the vehi- cle in front and the stored speed light up. Rev counter
! Do not drive in the overrevving range. Doing
so will damage the engine.
The red band in the rev counter indicates the
engine's overrevving range.
The engine is limited within a range to protect
the engine when the red band is reached. Outside temperature display
You should pay special attention to road condi-
tions when temperatures are around freezing
point.
Bear in mind that the outside temperature dis-
play indicates the measured air temperature
and not the road surface temperature.
The outside temperature display is in the multi-
function display (Y page 202).200
Displays and operationOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions J
Check brake fluid Check brake fluid
level level There is insufficient brake fluid in the brake fluid reservoir.
In addition, the red Jwarning lamp lights up on the instrument
cluster and a warning tone sounds.
G WARNING
Braking efficiency may be impaired.
There is a risk of an accident.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving.
X Secure the vehicle against rolling away (Y page 155).
X Consult a qualified specialist workshop.
X Do not top up the brake fluid. This does not correct the fault. #
Check Check
brake
brakepad
padwear
wear The brake pads/linings have reached their wear limit.
X Consult a qualified specialist workshop. G
Inoperative
Inoperative One or more main features of the Mercedes-Benz Contact system are
malfunctioning.
X Consult a qualified specialist workshop. Active
Active
Brake
BrakeAssist
Assist
Functions
Functions currently
currently
limited
limited See
SeeOwner's
Owner's
Manual
Manual Active Brake Assist is temporarily inoperative.
Possible causes:
R The radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio stations or other sources of electromagnetic radiation.
R The system is outside the operating temperature range.
R The on-board voltage is too low.
Once the causes listed above no longer apply, the display message
goes out.
Active Brake Assist is operational again.
If the display message does not disappear:
X Stop the vehicle, paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 155).
X Restart the engine. Active Brake Active Brake
Assist: Assist:
System
Systeminop‐
inop‐
erative
erative Active Brake Assist is unavailable due to a malfunction. The situation-
dependent braking assistance function may also have failed.
X Consult a qualified specialist workshop immediately. PRE-SAFE inopera‐
PRE-SAFE inopera‐
tive See Owner's tive See Owner's
Manual Manual
Important PRE-SAFE
®
functions have failed. All other occupant safety
systems, e.g. airbags, remain available.
X Consult a qualified specialist workshop immediately. Display
messages
223On-board computer and displays Z

Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions å
N
The yellow ESP ®
OFF warning lamp is lit while the engine is running.
ESP ®
is deactivated. ESP ®
will not stabilise the vehicle if it starts to skid or if a
wheel starts to spin.
G WARNING
If ESP ®
is deactivated, ESP ®
is unable to stabilise the vehicle.
Further driving systems or driving safety systems are thus restricted.
Increased risk of skidding and/or accident!
X Reactivate ESP ®
.
In exceptional cases (Y page 71) it may be better to deactivate ESP ®
.
Observe the important safety notes on ESP ®
(Y page 70).
X Adapt your driving style to suit the road and weather conditions.
If ESP ®
cannot be activated:
X Drive on carefully.
X Contact a qualified specialist workshop immediately and have the ESP ®
system
checked. M
N
Mercedes-AMG vehicles only:
The yellow SPORT handling mode warning lamp lights up while the engine is run-
ning.
SPORT handling mode is activated.
G WARNING
When SPORT handling mode is activated, ESP ®
is unable to stabilise the vehicle.
Increased risk of skidding and/or accident!
X Only switch to SPORT handling mode in accordance with the conditions descri-
bed in the "Activating/deactivating ESP ®
" section (Y page 71). ֌
N
The yellow ESP ®
and ESP ®
OFF warning lamps are lit while the engine is running.
ESP ®
, ESP ®
trailer stabilisation, BAS, Active Brake Assist, the HOLD function, hill
start assist, the adaptive brake lights and PRE‑SAFE ®
are not available due to a
malfunction.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to function normally, but without the functions listed above.
The braking distance may thus increase in an emergency braking situation.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
Increased risk of skidding and/or accident!
X Observe the additional display messages in the multifunction display.
X Drive on carefully.
X Consult a qualified specialist workshop immediately. Warning and indicator lamps in the instrument cluster
253On-board computer and displays Z

Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
M Solutions ֌
N
The yellow ESP ®
and ESP ®
OFF warning lamps are lit while the engine is running.
ESP ®
, ESP ®
trailer stabilisation, BAS, the HOLD function, hill start assist and PRE-
SAFE ®
are temporarily unavailable.
The adaptive brake lights and Active Brake Assist may also have failed.
ATTENTION ASSIST is deactivated.
Self-diagnosis is not yet complete.
G WARNING
The brake system continues to function normally, but without the functions listed above.
The braking distance may thus increase in an emergency braking situation.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
Increased risk of skidding and/or accident!
X Carefully drive on a suitable stretch of road, making slight steering movements
at a speed above 20 km/h.
The functions mentioned above are available again when the warning lamp goesout.
If the warning lamp is still on:
X Observe the additional display messages in the multifunction display.
X Drive on carefully.
X Consult a qualified specialist workshop immediately. !
N
The red indicator lamp for the electric parking brake flashes or lights up and/or
the yellow warning lamp for the electric parking brake lights up.
X Observe the additional display messages in the multifunction display. 6
N
The red restraint system warning lamp is lit while the engine is running.
The restraint system is malfunctioning.
G WARNING
The airbags or belt tensioners may either be triggered unintentionally or, in the
event of an accident, may not be triggered.
This poses an increased risk of injury.
X Observe the additional display messages in the multifunction display.
X Drive on carefully.
X Contact a qualified specialist workshop immediately and have the restraint sys-
tem checked.
Further information about the restraint system (Y page 39).254
Warning and indicator lamps in the instrument clusterOn-board computer and displays