Engine
Problem Possible causes/consequences and
0050
0050Solutions The engin
ewill not
start. The HOLD function or Distronic Plus* is activated.
X
Switch off HOLD (Y page 136) or Distronic Plus (Y page 131).
X Try to start th eenginea gain. The engin
ewill not
start .You can hear the
starter motor operat-
ing. R
Ther eisam alfunctio nintheengin eelectronics.
R Ther eisam alfunctio ninthefuel supply.
R The on-board voltage is to olow because th estarter battery is
to ow eak or discharged.
X Before th enexts tart attempt ,tur nt he keyb ack to position 0
(Y page 65 )intheignition loc korpressthe Start/Sto pbut-
ton* until all th eindicator light sintheinstrumen tcluste rhave
gon eout.
X Try to start th eenginea gain (Y page 98). When doin gso,
remembe rtha te xcessively lon gand frequen tattempt stostart
th ee nginew ill drain th ebattery.
If th eengined oes no tstart after several attempts:
X Consult aqualifie dspecialist workshop. The engin
ewill not
start .You can hear the
starter motor operat-
ing .The reserv efuel
warning lamp is on and
th ef uel gauge
shows 0. The fuel tan
khas been run dry.
X Refuel th evehicle. The engin
ewill not
start .You canno thear
th es tarter motor. The on-board voltage is to
olow because th estarter battery is too
weak or discharged.
X Jump-start th evehicle (Y page 276).
If th eengined oes no tstart despite attempting to jump-star tit:
X Consult aqualifie dspecialist workshop. The starter motor was exposed to
athe rmal load that was to ohigh.
X Allo wthe starter motor to coo ldown for approximately two
minutes.
X Try to start th eenginea gain.
If th eengines till does no tstart:
X Consult aqualifie dspecialist workshop. Troubleshooting
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Problem Possible causes/consequences and
0050
0050Solutions Vehicles with
apetrol
engine:
The engine is not run-
ning smoothly and is
misfiring. There is
amalfunction in the engine electronics or amechanical
componentoft he engine control unit.
X Only depress the accelerator pedal slightly.
X Have the cause rectified immediately at aqualified specialist
workshop.
Otherwise, non-combusted fuel may get into the catalytic con-
verter and damage it. The coolant tempera-
ture gauge shows a
value above 120 †.
The coolant warning
lamp may also light up
and awarning tone may
sound (Y page 107). 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 183). Observe the warning
notes as you do so and top up the coolant if necessary. If the coolant level is correct,t
he radiator fan may be faulty. The
coolant is too hot and the engine is no longer being cooled suffi-
ciently.
X If the coolant temperature is less than 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 on
mountain roads and stop/start driving. 242
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Problem Possible causes/consequences and
0050
0050Solutions You can no longer lock
or unlock the vehicle
using KEYLESS GO*.
KEYLESS GO* is in standby mode because the vehicle has not
been unlocked for an extended period.
X
Pull the door handle and then turn the key to position 2in the
ignition lock. KEYLESS-GO* is malfunctioning.
X
Lock/unlock the vehicle using the remote control function of
the key. Point the tip of the key at the driver's door handle from
close range and press the 0036/0037button.
X Have the key checked at aqualified specialist workshop. There is interference from
apowerful source of radio waves.
X Lock/unlock the vehicle as described in the "Opening and clos-
ing in an emergency" section (Y page 249).You have lost
akey. X
Have the key cancelled at aMercedes-Benz Service Centre.
X Report the loss immediately to the vehicle insurers.
X If necessary, have the manual locks changed too. You have lost the emer-
gency key element.
X
Report the loss immediately to the vehicle insurers.
X If necessary, have the manual locks changed too. The key cannot be
turned in the ignition
lock. The key has been in position
0for aconsiderable time.
X Remove the key and reinsert it into the ignition lock.
X Check the starter battery and charge it if necessary
(Y page 273).
X Start the engine. The on-board voltage is too low.
X
Switch off non-essential consumers, e.g. seat heating* or inte-
rior lighting, and try to turn the key again.
If this does not work:
X Check the starter battery and charge it if necessary
(Y page 273).
or
X Jump-start the vehicle (Y page 276).
or
X Consult aqualified specialist workshop. 248
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X
Push the emergenc ykey into two
holes 0046between the head restraints until
cover 0047releases.
X Remove cover 0047. X
Turn handwheel 0046in the direction of the
fronts eat to lower the head restraints. AIRCAP*
-fitting/removing the wind
deflector (Cabriolet)
You will need a4mmhex-socket wrench to
fit and remove the AIRCAP draught stop. Removing the AIRCAP draught stop
X Turn the key to position 2in the ignition
lock.
X Open the soft top fully (Y page 160).
X Extendt he head restraints in the rear com-
partmen t(Y page 69). Bolts on the AIRCAP draught stop between the
head restraints in the rear compartment
X
Use the 4mmhex-socket wrench to turn
the bolts on both sides anti-clockwise by
about 90° and loosen them.
X Pull the bolts out of the mountings on the
head restraints. X
Pull the AIRCAP draught stop out of the
guide rails in the direction of the arrow.
Make sure that you pull the AIRCAP draught
stop forwards slightly when doing so. Fitting the AIRCAP draught stop
X Turn the key to position 2in the ignition
lock.
X Open the soft top fully (Y page 160).
X Extendt he head restraints in the rear com-
partmen t(Y page 69). 258
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X
Keeping the AIRCAP draught stop horizon-
tal, guide it into the slot betwee nthe head
restraints in the direction of the arrow with
both racks straight down.
X Push the AIRCAP draught stop down until
the bolts are at the same heigh tasthe
mountings on the head restraints.
X Insert the bolts into the mountings on both
sides.
X Turn the bolts firmly with the 4mmhex-
socket wrench until they engage.
The markings on the bolts are vertical. Changing batteries (key)
Notes
It is advisabletoh ave the batteries replaced
at aq ualified specialist workshop, e.g. at a
Mercedes-Benz Service Centre. G
Risk of poisoning
Batteries contain toxic and caustic substan-
ces. For this reason, keep batteries awayf rom
children.
If ab attery is swallowed, consult adoctor
immediately. H
Environmental note
Do not dispose of batteries with the house-
hold rubbish. They contain highl ytoxic sub-
stances.
Take discharged batteries to aqualified spe-
cialist workshop, e.g. aMercedes-Benz Service Centre, or to
aspecia lcollection point
for old batteries. Key
Checking the battery X
Press the 0037or0036 button.
The battery is working properl yifthe bat-
tery charge indicator lamp lights up briefly.
Removing/installing the battery You require
aCR20253Vc ell battery.
X Remove the emergency key element from
the key (Y page 249). X
Press the emergency key element into the
opening in the key in the direction of
arrow 0047until cover 0046of the battery tray
opens. Be sure that yourf ingers are not
stopping the cover from opening. Changing batteries (key)
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X
Remove th ecover of th ebattery tray.
X Repeatedly tap th ekeyagainst your palm
until battery 008Afallsout of th ekey.
X Inser tthe newb attery wit hthe positive
pole facin gupwards. Use alint-free cloth to
do so.
X Inser tthe fron ttab soft hebattery tray's
cover first and then press to close it.
X Chec kthe function of all ke ybuttons on the
vehicle. Changin
gbulbs Notes on changin
gbulbs
i If you need assistanc einchangin gthe
bulbs ,contac taqualified specialist work-
sho pwhichh as th eneces saryspecialist
knowledge and tools to carry out th ework
required. Mercedes-Ben zrecommends
that you use aMercedes-Ben zServi ce
Centr efor this purpose .Inparticular, work
relevan ttosafetyoro nsafety-related sys-
tems mus tbecarriedout at aqualified spe-
cialist workshop.
Bulb sand lamp sare an important aspect of
vehicl esafety. You mus tthe refor emakes ure
that these function correctl yatall times.
Hav ethe headlamp setting schecked regu-
larly. Only use th etypes of bulbs specified
here. If th enew bulb still does no tligh tup,
consult aqualified specialist workshop.
Do no ttou ch th eglasstub eofn ewbulbs with
your bare hands. Even minor contamination
can burn into th eglasssurfac eand reduce th
es ervic elife of th ebulbs .Always use alint-
free cloth or only touch th ebase of th ebulb
when fitting. G
Ris
kofi njury
Bulb sand lights can become ver yhot.F or this
reason ,allow them to cool down before
changin gthem. Otherwise ,you could burn
yourself when you touch them.
Kee pbulbs out of th ereac hofc hildren .Oth-
erwise, they could damage them, for example,
and injur ethemselves.
Never use abulb whic hhas been dropped.
Suc hab ulb may explod eand injur eyou.
Halogen bulbs are pressurised and could
explod ewhen you chang ethem, especially if
they are ver yhot.Y ou should therefor ewear
eye protection and gloves when you are
changin gthem. G
Ris
kofi njury
Xenon bulbs carry ahigh voltage. You could
get an electric shock and be seriously or even
fatally injured if you touch th eelectric con-
tacts on xeno nbulbs .Therefore ,never
remove th ecover from xeno nbulbs.
Do no tcha ng ex enon bulbs yourself ,but have
them replaced at aqualified specialist work-
sho pwhichh as th eneces saryspecialist
knowledge and tools to carry out th ework
required.
Mercedes-Ben zrecommends that you use a
Mercedes-Ben zServic eCentr efor this pur-
pose. In particular, wor krelevan ttosafetyor
on safety-related systems mus tbecarriedout
at aq ualified specialist workshop. 260
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Overview: changing bulbs/bulb types
You can replace the following bulbs: Halogen headlamps Bulb type
0046
Dipped-beam headlamps 43
:H755W
0047Main-beam headlamp: H7 55 W
008A Side lamp/parkin glamp: W5W
0088Turn signal lamp 43
:PY21W Bi-xenon headlamps* Bulb type
0046
Cornerin glight*: H7 55 W Changing bulbs
Dipped-beam headlamps( halogen
headlamps) Due to their location
,have the bulbs in the
left-hand headlamp changed at aqualified
specialist workshop, e.g. aMercedes-Benz
Service Centre.
X Switc hoff the lights.
X Open the bonnet.
X Turn housing cover 0046anti-clockwise and
remove it.
X Turn bulb holder 0047anti-clockwise and
remove it.
X Remove the bulb from bulb holder 0047.
X Inser tthe new bulb intob ulb holder0047.
43 Due to their location ,have the bulbs in the left-hand headlamp changed at aqualified specialist workshop,
e.g. aMercedes-Benz Servic eCentre. Changing bulbs
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X
Insert bulbh older0047and turn it clockwise.
X Align housing cover 0046and turn it clock-
wise.
Main-beam headlamps (halogen head-
lamps)/cornering lamp* (Intelligent
Light System*) X
Switch off the lights.
X Open the bonnet.
X Turn housing cover 0046anti-clockwise and
remove it.
X Turn bulbh older0047anti-clockwise and
remove it.
X Remove the bulbf rom bulbholder0047.
X Insert the new bulbi nto bulbholder0047.
X Insert bulbh older0047and turn it clockwise.
X Align housing cover 0046and turn it clock-
wise.
Side lamp/parking lamp (halogen head-
lamps) X
Switch off the lights.
X Open the bonnet.
X Turn housing cover 0046anti-clockwise and
remove it.
X Pullo ut bulbh older0047.
X Remove the bulbf rom bulbholder0047.
X Insert the new bulbi nto bulbholder0047.
X Insert bulbh older0047.
X Align housing cover 0046and turn it clock-
wise.
Turn signal lamp (halogen headlamps) Due to their location, have the bulbs in the
left-hand headlamp changed at
aqualified
specialist workshop, e.g. aMercedes-Benz
Service Centre.
X Switch off the lights.
X Open the bonnet.
X Turn bulbh older0046anti-clockwise and
remove it.
X Turn the bulba nti-clockwise, applying
slight pressure, and remove it from bulb
holder 0046.
X Insert the new bulbi nto bulbholder0046and
turn it clockwise.
X Insert bulbh older0046and turn it clockwise. 262
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