Engine
Warning/
indicator
lamp
0051 0051
Signal type
Possible causes/consequences and 0050
0050Solutions 00B9
0051
The yellow Check Engine warning lamp lights up while the engine is running.
There may be a malfunction, for example:
R in the engine management
R in the fuel injection system
R in the exhaust system
R in the ignition system
R in the fuel system
The emission limit values may be exceeded and the engine may be in emergency
mode.
X Have the vehicle checked as soon as possible at a qualified specialist workshop.
In some states, you must immediately visit a qualified specialist workshop as soon as the yellow Check Engine warning lamp lights up. This is due to the legal require-ments in effect in these states. If in doubt, check whether such legal regulations
apply in the state in which you are currently driving. 00B6
0051
The yellow reserve fuel warning lamp lights up while the engine is running.
The fuel level has dropped into the reserve range.
X Refuel at the nearest gas station. 00B6
0051
The yellow reserve fuel warning lamp flashes while the vehicle is in motion.
In addition, the 00B9Check Engine warning lamp may light up.
The fuel filler cap is not closed correctly or the fuel system is leaking.
X Check that the fuel filler cap is correctly closed.
X If the fuel filler cap is not correctly closed: close the fuel filler cap.
X If the fuel filler cap is closed: visit a qualified specialist workshop.00AC
0051
The red coolant warning lamp lights up while the engine is running and the
coolant temperature gauge is at the start of the scale.
The temperature sensor for the coolant temperature gage is defective.
The coolant temperature is no longer being monitored. There is a risk of engine
damage if the coolant temperature is too high.
X Pull over and stop the vehicle safely and switch off the engine, paying attention
to road and traffic conditions. Do not continue driving under any circumstances.
X Secure the vehicle against rolling away (Y page 127).
X Consult a qualified specialist workshop. 204
Warning and indicator lamps in the instrument clusterOn-board computer and displays
Warning/
indicator
lamp
0051 0051
Signal type
Possible causes/consequences and 0050
0050Solutions 00AC
0051
The red coolant warning lamp comes on while the engine is running.
The coolant level is too low.
If the coolant level is correct, the airflow to the engine radiator may be blocked or the electric engine radiator fan may be malfunctioning.
The coolant is too hot and the engine is no longer being cooled sufficiently.
X Observe the additional display messages in the multifunction display.
X Pull over and stop the vehicle safely and switch off the engine, paying attention
to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 127).
X Leave the vehicle and keep a safe distance from the vehicle until the engine has
cooled down.
X Check the coolant level and add coolant, observing the warning notes
(Y page 239).
X If you need to add coolant more often than usual, have the engine coolant sys-
tem checked.
X Make sure that the air supply to the engine radiator is not blocked, e.g. by snow,
slush or ice.
X Do not start the engine again until the coolant temperature is below 248 ‡
(120 †). Otherwise, the engine could be damaged.
X Drive to the nearest qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in mountainous terrain,
and stop-and-go traffic. 00AC
0051
The red coolant warning lamp comes on while the engine is running. A warning
tone also sounds.
The coolant temperature has exceeded 248 ‡(120 †). The airflow to the engine
radiator may be blocked or the coolant level may be too low.
G WARNING
The engine is not being cooled sufficiently and may be damaged.
Do not drive when your engine is overheated. This can cause some fluids which
may have leaked into the engine compartment to catch fire.
Steam from the overheated engine can also cause serious burns which can occur just by opening the hood.
There is a risk of injury.
X Observe the additional display messages in the multifunction display.
X Pull over and stop the vehicle safely and switch off the engine, paying attention
to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 127).
X Leave the vehicle and keep a safe distance from the vehicle until the engine has
cooled down.
X Check the coolant level and add coolant, observing the warning notes
(Y page 239).
X If you need to add coolant more often than usual, have the engine coolant sys-
tem checked. Warning and indicator lamps in the instrument cluster
205On-board computer and displays Z
Warning/
indicator
lamp
0051
0051 Signal type
Possible causes/consequences and 0050 0050Solutions X
Make sure that the air supply to the engine radiator is not blocked, e.g. by snow,
slush or ice.
X At coolant temperatures below 248 ‡ (120 †), drive to the nearest qualified
specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in mountainous terrain,
and stop-and-go traffic. Driving systems
Warning/
indicator
lamp
0051
0051 Signal type
Possible causes/consequences and 0050 0050Solutions 00BA
0051
The red distance warning lamp lights up while the vehicle is in motion. A warning
tone also sounds.
You are approaching a vehicle or a stationary obstacle in your line of travel at too high a speed.
X Be prepared to brake immediately.
X Pay careful attention to the traffic situation. You may have to brake or take
evasive action.
Further information on the distance warning function of Active Brake Assist
(Y page 59). 206
Warning and indicator lamps in the instrument clusterOn-board computer and displays
Vehicle
Warning/
indicator
lamp
0051 0051
Signal type
Possible causes/consequences and 0050
0050Solutions 00CC
0051
The red power steering warning lamp is lit while the engine is running.
The power steering is malfunctioning.
A warning tone also sounds.
G WARNING
You will need to use more force to steer.
There is a risk of an accident.
X Check whether you are able to apply the extra force required.
X If you are able to steer safely: carefully drive on to a qualified specialist work-
shop.
X If you are unable to steer safely: do not drive on. Contact the nearest qualified
specialist workshop. 208
Warning and indicator lamps in the instrument clusterOn-board computer and displays
Stowage areas
Loading guidelines
G
DANGER
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Exhaust
gases can enter the vehicle interior if the
trunk lid is open while the engine is running,
especially if the vehicle is in motion. There 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 a risk of injury, particu-
larly in the event of sudden braking or a sud-
den change in direction.
Always store objects so that they cannot be
flung around. Secure objects, luggage or
loads against slipping or tipping before the
journey. G
WARNING
The exhaust tail pipe and tail pipe trim can
become very hot. If you come into contact
with these parts of the vehicle, you could burn
yourself. There is a risk of injury.
Always be particularly careful around the
exhaust tail pipe and the tail pipe trim. Allow
these components to cool down before touch-
ing them.
! This vehicle is not designed to transport any
items on the trunk lid or to allow luggage car-
riers or equipment of any kind to be installed
to the trunk lid. Otherwise the vehicle and the
retractable hardtop could be damaged. The handling characteristics of a laden vehicle
are dependent on the distribution of the load
within the vehicle. For this reason, you should
observe the following notes when transporting a load:
R Never exceed the maximum permissible
gross vehicle mass or the gross axle weight
rating for the vehicle (including occupants).
The values are specified on the vehicle iden-
tification plate on the B-pillar of the driver's
door.
R The trunk is the preferred place to carry
objects.
R Position heavy loads as far forwards as pos-
sible and as low down in the trunk as possible.
R The load must not protrude above the upper
edge of the seat backrests.
R Secure the load with sufficiently strong and
wear-resistant tie-downs. Pad sharp edges for
protection. Stowage spaces
Important safety notes G
WARNING
If objects in the passenger compartment are
stowed incorrectly, they can slide or be
thrown around and hit vehicle occupants. In
addition, cup holders, open stowage spaces
and mobile phone brackets cannot always
retain all objects they contain. There is a risk of injury, particularly in the event of sudden
braking or a sudden change in direction.
R Always stow objects so that they cannot be
thrown around in such situations.
R Always make sure that objects do not pro-
trude from stowage spaces, parcel nets or
stowage nets.
R Close the lockable stowage spaces before
starting a journey.
R Always stow and secure heavy, hard, poin-
ted, sharp-edged, fragile or bulky objects in
the trunk.
Observe the loading guidelines (Y page 218).218
Stowage areasStowage and features
Glove compartment
X
To open: pull handle 0043and open glove box
flap 0044.
X To close: fold glove box flap 0044up until it
engages. The glove box can be locked and unlocked using
the mechanical key.
X To lock: insert the mechanical key into the
lock and turn it to key position 0048.
X To unlock: insert the mechanical key into the
lock and turn it to key position 0047.
Stowage compartment in front of the
armrest X
To open: slide cover 0043forwards.
Stowage compartment under armrest X
To open: press button 0043.
The stowage compartment opens from the
rear.
Depending on the vehicle's equipment, the fol-
lowing may be in the stowage space: R a multimedia connector unit with an SD card
slot and two USB ports, for example, for use
with an iPod ®
, iPhone ®
or MP3 player (see the
Digital Operator's Manual).
The ignition lock for starting the engine with the
SmartKey is in the stowage compartment
(Y page 111). Additional stowage space
Depending on the equipment, the following
additional stowage areas are available in the
vehicle:
R open stowage compartments in the doors
R stowage net in the front-passenger footwell
R a net on the rear wall behind the driver's seat
provides stowage space for small objects
such as a reflective safety jacket
i Reflective safety jackets can be stored in
the door stowage compartments.
Observe the safety guidelines for stowage
spaces (Y page 218). Stowage areas
219Stowage and features Z
Cigarette lighter
G
WARNING
You can burn yourself if you touch the hot
heating element or the socket of the cigarette lighter.
In addition, flammable materials can ignite if:
R the hot cigarette lighter falls
R a child holds the hot cigarette lighter to
objects, for example
There is a risk of fire and injury.
Always hold the cigarette lighter by the knob.
Always make sure that the cigarette lighter is
out of reach of children. Never leave children unsupervised in the vehicle.
Your attention must always be focused on the
traffic conditions. Only use the cigarette lighter when road and traffic conditions permit. X
Select key position 0048with the Start/Stop
button (Y page 111).
X To open: slide cover 0043forward until it
engages.
X Press in cigarette lighter 0044.
Cigarette lighter 0044will pop out automatically
when the heating element is red-hot.
X To close: briefly press cover 0043at the front. 12 V sockets
General notes X
Select key position 0047with the Start/Stop
button (Y page 111).
The sockets can be used for accessories with a
maximum draw of 180 W (15 A). Accessories include such items as chargers for mobile
phones.
If you use the sockets for long periods when the
engine is switched off, the battery may dis-
charge.
An emergency cut-out ensures that the on-
board voltage does not drop too low. If the on-
board voltage is too low, the power to the sock- ets is automatically cut. This ensures that there
is sufficient power to start the engine.
Socket in the trunk X
Lift up the cover of socket 0043. mbrace
General notes The mbrace system is only available in the USA.
A license agreement must be in place in order to
activate the mbrace service. Make sure that
your system is activated and operational. To
register, press the 00D9Info call button. If any of
the steps mentioned are not carried out, the
system may not be activated.
If you have questions about the activation, con- tact one of the following telephone hotlines:
Mercedes-Benz Customer Assistance Center at
1-800 FOR-MERCEDE S(1-800-367-6372) or
1-866-990-9007
Shortly after successfully registering with the
mbrace service, a user ID and password will be
sent to you by mail. You can use this password
to log onto the mbrace area under "Owners
Online" at http://www.mbusa.com. 222
FeaturesStowage and features
Problem
Possible causes/consequences and
0050
0050Solutions The rear spoiler cannot
be retracted again after
manually extending it. You have opened the trunk lid while manually extending the rear
spoiler.
X Close the trunk lid. The rear spoiler does not
extend or retract auto-
matically. The rear spoiler's movement is blocked, e.g. by an object jammed
between the body and the rear spoiler.
X Remove the object. Garage door opener
General notes The HomeLink
®
garage door opener integrated
in the rear-view mirror allows you to operate up
to three different door and gate systems.
Use the integrated garage door opener only on
garage doors that:
R they are equipped with a safety stop and
reverse feature
R they conform to the current U.S. safety stand-
ards
When it has been programmed, the integrated
garage door opener in the rear-view mirror will
assume the function of the garage door sys-
tem's remote control. Please also read the oper-
ating instructions for the garage door system.
When programming a garage door opener, park the vehicle outside the garage. Do not leave the
engine running while programming it.
Certain garage door drives are incompatible
with the integrated garage door opener. If you
have difficulty programing the integrated garage
door opener, contact a Mercedes-Benz Service
Center.
Alternatively, you can call the following tele-
phone assistance services:
R USA: Mercedes-Benz Customer Assistance
Center at 1-800-FOR-MERCedes
R Canada: Customer Service at
1-800-387-0100
R HomeLink ®
hotline 1-800-355-3515 (free of
charge)
More information on HomeLink ®
and/or com-
patible products is also available on the Internet
at http://www.homelink.com.
Notes on the declaration of conformity
(Y page 27).
USA: FCC ID: CB2HMIHL4 Canada: IC: 279B-HMIHL4
Important safety notes G
WARNING
When you operate or program the door with
the integrated garage door opener, persons in the range of movement of the door may
become trapped or be struck by the door.
There is a risk of injury.
When using the integrated garage door
opener, always make sure that nobody is
within the range of movement of the door. G
DANGER
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Inhaling
these exhaust gases is hazardous to health
and can result in poisoning. There is a risk of
fatal injury. Therefore, never leave the engine running an enclosed space without adequate
ventilation.
Programming Programming the buttons
Pay attention to the "Important safety notes"
(Y page 231). Features
231Stowage and features Z