2018 MERCEDES-BENZ CLA check engine

X
Press the lockin gb utton on the driver’s door
( Y
page 76).X
Check whether the lockin gk nobs on the
front-passenger door and the rear doors are
still visible. Press down the lockin gk nobs by
hand, if necessary. X
Close the driver's door. X
Take the mechanical key out of the SmartKey
( Y
page 72).X
Insert the mechanical key into the lock of the
driver's door as far as it will go.
X
Turn the mechanical key clockwise as far as it
will go to position G .X
Turn the mechanical key back and remove it. X
Make sure that the doors and the trunk lid are
locked. X
Insert mechanical key into the SmartKey
( Y
page 72).
i If you lock the vehicle as described above,
the fuel filler flap is not locked. The anti-theft
alarm system is not armed.
Trunk
Important safety notes
G WARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Exhaust
gases can enter the vehicle interior if the
trunk lid is open when the engine is running,
especially if the vehicle is in motion .T here is a
risk of poisoning.
Always switch off the engine before opening
the trunk lid. Never drive with the trunk lid
open. G WARNING
If objects, luggage or loads are not secured or
not secured sufficiently, they could slip, tip
over or be flung around and thereby hit vehicle
occupants. There is ar isk of injury, particu-
larly in the event of sudden braking or as ud-
den change in direction.
Always store object ssot hat they cannot be
flung around. Secure objects, luggage or
loads against slipping or tipping before the
journey.
! The trunk lid swings upwards when opened.
Therefore, make sure that there is sufficient
clearance above the trunk lid.
The opening dimensions of the trunk lid can be
found in the "Vehicle data" section
( Y
page 320).
You should preferably place luggage or loads in
the trunk .O bserve the loading guidelines
( Y
page 237).
Do not leave the SmartKey in the trunk .Y ou
could otherwise lock yourself out.
The trunk lid can be: R
opened and closed manually from outside R
opened automatically from outside R
opened automatically from inside R
released with the emergenc yr elease from the
inside
Opening/closing from outside
Opening
X
Press the 6 button on the SmartKey. X
Pull handle C . X
Raise the trunk lid.78
Trunk
Opening and closing

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 hea tu p. There is ar isk
of fire.
Carry out regular checks to make sure that
there are no flammable foreig nm aterials in
the engine compartment or in the exhaust
system.
General notes During ac old start, the engine runs at higher
speeds to enabl et he catalytic converter to
reach its operating temperature. The sound of
the engine may change during this time.
Automatic transmission X
Shift the transmission to position ]
( Y
pag e1 30).
The transmission position display in the mul-
tifunction display shows P ( Y
pag e1 30).
i You can start the engine in transmission
position ] and \\ .
Starting procedure with the SmartKey To start the engine using the SmartKey instead
of the Start/Stop button, pul lt he Start/Stop
button out of the ignitio nl ock.X
Turn the SmartKey to position I in the igni-
tion lock ( Y
pag e1 22) and release it as soon
as the engine is running.
Starting procedure with the Start/Stop
button The Start/Stop button can be used to start the
vehicl em anually without inserting the SmartKey
into the ignitio nl ock. The Start/Stop button
must be inserted in the ignitio nl ock 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 av ali dS martKey is in
the vehicle. Switch off the engine and always
take the SmartKey with you when leaving the vehicle, even if you only leave it for as hort time.
Pay attention to the important safety notes. X
Depress the brake peda la nd keep it
depressed. X
Press the Start/Stop button once
( Y
pag e1 22).
The engine starts.
Starting procedure via smartphone Observe the important safety notes on starting
the engine ( Y
pag e1 23).
You can als os tart you re ngine via you rs mart-
phone from outside the vehicle. In this case, the
previousl ys elected climate control setting is
activated. In this way you can cool or heat the
interior of the vehicl eb efore starting the jour-
ney.
Only start the engine via you rs martphone if it is
safe to start and run the engine where you rv ehi-
cle is parked.
Observe the lega ls tipulations in the area where
you rv ehicl eisp arked .E ngine start via smart-
phone may be limited to certain countries or
regions.
You can execute am aximu moft wo consecutive
starting attempts via you rs martphone. If you
insert the SmartKey into the ignitio nl ock, you
can carry out two more starting attempts.
Once you have started the engine, you can
switch the engine off via you rs martphone at any
time.
You can only start the engine via you rs mart-
phone if: R
the SmartKey is in the ignitio nl ockR
park position ] is selectedR
the accelerator peda lisn ot depressedR
the anti-theft alarm system is not activated R
the pani ca larm is not activated R
the hazard warning lamp sa re switched offR
the hood is closed R
the doors are closed and locked R
the windows and sliding sunroof are closed
Also make sure that: R
the fuel tank is sufficiently filled R
the starter battery is sufficiently charged
G WARNING
Limbs coul dbec rushe dort rappe dift he
engine is started unintentionally during ser-124
Driving
Driving and parking

Problem
Possible causes/consequences and P Solutions
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 278).
If the engine does not start despite attempt stoj ump-start it:X
Consult aq ualified specialist workshop.
The starter motor was exposed to at hermal load that was too high.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 aq ualified specialist workshop.
The engine is not running
smoothly and is misfir-
ing. There is am alfunction in the engine electronics or in am echanical
componen toft he 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 aq ualified specialist work-
shop.
The coolant temperature
gauge shows av alue
above 248 ‡( 120 †).
The coolant warning
lamp may also be on and
aw arning 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 260). Observe the warning notes
as you do so and add coolant if necessary.
DYNAMIC SELEC Tb utton (all vehicles
except Mercedes-AMG vehicles) Use the DYNAMIC SELECT button to change the
drive program. Depending on the drive program
selected the following vehicle characteristics
will change: R
the drive (engine and transmission manage-
ment) R
the suspension (vehicles with damping sys-
tem or AMG adaptive sport suspension sys-
tem) R
the steering R
the availability of the ECO start/stop function R
the climate control:
Each time you start the engine with the Smart-
Key or the Start/Stop button, drive program C is
activated. For further information about starting
the engine, see ( Y
page 125). X
Press DYNAMIC SELECT button C as many
times as necessary until the desired drive
program is selected.
The selected drive program appears in the
multifunction display .A fter five seconds the
display goes out and the status icon of the
selected drive program appears.128
DYNAMIC SELECT button (all vehicles except Mercedes-AMG vehicles)
Driving and parking

Transmission positions E Park position
Thi sp revents the vehicl ef ro mr olling
away when stopped.
Onl ys hift the transmission to posi-
tion ] when the vehicl eiss tation-
ary. The parkin gl oc ks houl dn ot be
used as ab rake when parking.
Alway sa pply the electronic parking
brake in additio ntot he parkin gl oc k
in order to secur et he vehicle.
In the event of am al functio noft he
vehicle's electronics ,t he transmis-
sion ma yl oc kinp osit ion ] .H ave
the vehicl ee le ctronics checked
immediatel yataq uali fied specialist
workshop.
Park position ] is automatically
engaged if: R
yo us wi tch off the engine using the
SmartKe ya nd remove the Smart-
Key R
yo us wi tch off the engine using the
SmartKe yoru si ng the Start/Stop
button and open the driver's door
or front-passenge rd oo rR
yo uo pe nt he driver's door when
the vehicl eiss tationar yorw he n
drivin gatav er yl ow spee da nd the
transmission is in position [ or
^
F Revers eg ea r
Onl ys hift the transmission into posi-
tion ^ when the vehicl eiss tation-
ary. D Neutral
Do not shift the transmission to \\
whil ed riving. The automatic trans-
mission could otherwis ebed am -
aged.
No powe rist ransmitted fro mt he
engine to the drive wheels.
Releasing the brakes will allo wy ou to
mov et he vehicl ef reely, e.g .top us h
it or tow it.
If ESP ®
is deactivated or faulty: shift
the transmission to position \\ if the
vehicl eisind an ge rofs kidding ,e .g.
on icy roads.
If yo us wi tch the engine off with the
transmission in position ^ or [ ,
the automatic transmission shifts to
\\ automatically.
! Coasting in neutral \\ may
cause damage to the drive train.
: Drive
The automatic transmission changes
gear automatically. All forward gears
ar ea vailable.
Driving tips
Changin gg ea rThe automatic transmission shifts throug ht he
individual gear sa ut omaticall yw he nitisint rans-
mission position [ .T hi sa ut omatic gear shift-
ing behavio risd et ermine db y:R
the selecte dd rive program R
the positio noft he accelerator pedal R
the roa ds peed
Accelerator peda lp ositionYour style of drivin gi nfluences how the auto-
matic transmission shifts gear: R
little throttle :e ar ly upshifts R
mor et hrottle :l at eu ps hiftsAutomati ct ransmission 133
Driving an dp arking Z

Befor et he engine speed reaches the red area,
an upshift indicator will be show nint he multi-
function display. X
Shift to recommende dg ear C whe nm es-
sage D is show nint he multifunction display.
Kickdown X
For maximum acceleration, depress the
accelerator pedal beyond the pressure point.
The automatic transmission shifts to al ower
gea rd epending on the engine speed.X
Shift back up once the desire ds peed is
reached. During kickdown, yo uc annot shift gears using
the steering wheel paddl es hifters.
If yo ua pply ful lt hrottle ,t he automatic trans-
missio ns hifts up to the next gea rw he nt he
maximum engine speed is reached .T hi sp re-
vents the engine from overrevving.
Mercedes-AMG vehicles: it is only possible to
use kickdown in temporary manual drive pro-
gram M .W he nm anual drive program M is per-
manently activated, kickdown is not possible.
Problems with the transmission Problem
Possible causes/consequence sa nd P Solutions
The transmission has
problem ss hifting gear. The transmission is losing oil. X
Have the transmission checke dataq uali fied specialist workshop
immediately.
The acceleration ability
is deteriorating.
The transmission no lon-
ger shifts into al loft he
gears.
Revers eg ea rc an no lon-
ger be engaged. The transmission is in emergency mode. X
Stop the vehicle. X
Shift the transmission to position ] .X
Switch off the engine. X
Wait at least ten seconds before restarting the engine. X
Shift the transmission to position [ .X
Have the transmission checke dataq uali fied specialist workshop
immediately.
Refueling
Important safety notes
G WARNING
Fue lish ighly flammable. If yo uh andle fuel
incorrectly ,t here is ar is koff ire and explo-
sion. You mus ta void fire ,o pe nf lames, creating
sparks and smoking. Switch off the engine
and ,ifa ppli cable, the auxiliary heating before
refueling.
G WARNING
Fue lisp oisonou sa nd hazardou stoh ealth.
There is ar isk of injury.138
Refueling
Drivin ga nd parking

Warning/
indicator
lamp Q Signal type
Possibl ec auses/consequences and P Solutions
$I
Q I (USA only), $ (Canada only): 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 additiona ld isplay messages in the multifunction display.
u
Q The red restraint system warning lamp is lit while the engine is running.
The restraint system is malfunctioning.
G WARNING
The air bag sorE mergency Tensioning Devices may either be triggere du ninten-
tionally or, in the event of an accident, may not be triggered.
There is an increased risk of injury. X
Observe the additiona ld isplay messages in the multifunction display.X
Drive on carefully. X
Contact aq ualified specialist worksho pa nd have the restraint system checked.
For further information about the restraint system, see ( Y
pag e4 0).
Engine Warning/
indicator
lamp Q Signal type
Possibl ec auses/consequences and P Solutions

the househol dr ubbish .T hey
must be collected separately
and recycle dtop rotect the
environment.
Dispose of batteries in an
environmentall yf riendly
manner. Take discharged
batteries to aq uali fied spe-
cialist workshop or as pe cial
collectio np oi nt for used bat-
teries.
! Hav et he battery checked regularly at a
qualified specialis tw or kshop.
Observe the service intervals in the Mainte-
nanc eB ookle torc ontact aq uali fied specialist
workshop for mor ei nformation.
! Yo us houl dh av ea ll work involvin gt he bat-
tery carrie do ut at aq uali fied specialis tw or k-
shop. In the exceptiona lc as et ha titi sn eces-
sary for yo utod is connect the battery your-
self, make sure that: R
yo us wi tch off the engine and remove the
key .Onv ehicles with KEYLESS-GO, ensure
tha tt he ignition is switched off .C he ck that
al lt he indicator lamps in the instrument
cluste ra re off .O therwise, electronic com-
ponents ,s uc hast he alternator, ma yb e
damaged. R
yo uf irst remove the negative terminal
clamp and the nt he positive terminal
clamp. Never swap the termina lc lamps.
Otherwise, the vehicle' se le ctronic system
ma ybed amaged .R
in vehicles with automatic transmission,
the transmission is locked in position P
after disconnecting the battery .T he vehicle
is secur ed a gainst rolling away .Y ou ca
n
the nnol on ge rm ov et he vehicle.
The battery and the cove roft he positive ter-
minal clamp must be installe ds ec urel yd ur ing
operation.
Compl yw it hs af ety precautions and take pro-
tective measures when handling batteries. Risk of explosion.
Fire, open flames and smoking are
prohibited when handling the bat-
tery .A voi dc reating sparks.
Battery aci disc austic. Avoi dc ontact
with skin, eyes or clothing.
Wear suitabl ep rotective clothing,
especiall yg lo ves, apron and face-
guard.
Rinse any aci ds pills immediately
with clear water. Contact ap hysician
if necessary.
Wear ey ep rotection.
Kee pc hildren away.
Observe thi sO pe rator' sM an ual.
For safety reasons, Mercedes-Benz recom-
mend st ha ty ou onl yu se batteries which have
been tested and approved for your vehicl eb y
Mercedes-Benz. Thes eb at teries provide
increase di mpact protection to prevent vehicle
occupants fro ms uf ferin ga ci db ur ns shoul dt he
battery be damage dint he event of an accident.
In order for the battery to achieve the maximum
possibl es er vice life, it must always be suffi-
ciently charged.
Like othe rb at teries ,t he vehicl eb at tery may
discharge ove rt im eify ou do not us et he vehicle.
In thi sc ase, have the battery disconnecte data
qualified specialis tw or kshop .Y ou can also
charge the battery with ac harge rr ecommended
by Mercedes-Benz. Contact aq uali fied special-
is tw or kshop for furthe ri nformation.
Hav et he battery condition of charge checked
mor ef requentl yify ou us et he vehicl em ai nl yf or
short trip sorify ou leav eits tanding idle for a
length yp er iod. Consult aq uali fied specialist
workshop if yo uw is htol eave your vehicle
parked for al on gp er io doft ime.
Onl yr eplace ab at tery with ab at tery tha th as
been recommended by Mercedes-Benz.Battery (vehicle) 277
Breakdow na ssistance Z

G WARNING
During charging and jump-starting, explosive gase sc an escap ef rom the battery .T here is ar isk
of an explosion.
Particularl ya voi df ire, open flames, creating sparks and smoking. Ensure there is sufficient ven-
tilation while charging and jump-starting. Do not lea no ver ab attery.
G WARNING
During the charging process ,ab attery produces hydrogen gas. If as hort circui to ccurs or sparks
are created ,t he hydrogen gas can ignite. There is ar isk of an explosion.R
Make sure that the positive terminal of ac onnected battery does not come into contact with
vehicl ep arts.R
Never place metal objects or tools on ab attery.R
It is important that you observe the described order of the battery terminal sw hen connecting
and disconnecting ab attery.R
When jump-starting, make sure that the battery pole sw ith identical polarity are connected.R
It is particularl yi mportant to observe the described order when connecting and disconnecting
the jumper cables. R
Never connect or disconnect the battery terminal sw hile the engine is running.
G WARNING
Ad ischarged battery can freeze at temperatures below freezing point. When jump-starting the
vehicl eorc harging the battery ,g ase sc an escap ef rom the battery .T here is ar isk of an explosion.
Allow the frozen battery to thaw out before charging it or jump-starting.
! Avoid repeated and lengthy starting attempts. Otherwise, the catalytic converter coul db e
damaged by the non-combusted fuel.
If the indicator/warning lamp sdon ot light up in the instrument cluster at low temperatures, it is very
likel yt hat the discharged battery has frozen. In this case you may neither jump-start the vehicl en or
charge the battery .L et the battery thaw first. The service life of at hawed-out battery may be shorter.
The starting characteristics can be impaired ,p articularl yatl ow temperatures. Have the thawed-out
battery checked at aq ualified specialist workshop.
Do not start the vehicl eu sing ar api dc harging device. If you rv ehicle's battery is discharged, the
engine can be jump-started from another vehicl eorf rom as econd battery using jumper cables.
Observe the following points: R
The battery is not accessible in all vehicles. If the other vehicle's battery is not accessible ,j ump-
start the vehicl eu sing as econd battery or aj ump-starting device.R
You may only jump-start the vehicl ew hen the engine and exhaust system are cold.R
Do not start the engine if the battery is frozen. Let the battery thaw first. R
Only jump-start from batterie sw ith a12Vv oltag er ating.R
Only use jumper cables that are not damaged and have as ufficient cross-section and insulated
terminal clamps. R
Make sure that the two vehicles do not touch. Jump-starting 279
Breakdown assistance Z