
Rinse any affected areas off with plenty of
clean water. Consult a doctor if necessary.
i If the DEF level has dropped below the
reserve range, add at least 2.0 US gal
(7.6 l) of DEF at the latest after receiving the second warning message (Y page 182).
i If you switch off the engine at a low out-
side temperature and add DEF, restart the
engine after refueling. If you leave the vehi- cle parked without restarting the engine
and the DEF freezes in the DEF tank, the on-
board computer will only be able to register the new fill level after a defrosting period of
up to 60 minutes. During this time the
engine may only be operated in neutral.
You will find further information on DEF in the "Service products" section (Y page 318).
Refueling procedure DEF filler neck
Non-lockable DEF filler cap
Example: DEF filler cap in the engine compartment
X To open: switch off the ignition.
X Open the hood (Y page 248).
X Turn filler cap 0043counter-clockwise and
remove it.
X To close: replace cap 0043on the filler neck
and turn it clockwise.
You will hear a click when cap 0043is fully
closed.
X Close the hood (Y page 249). Lockable filler cap
Example: DEF filler cap in the engine compartment
X
To open: switch off the ignition.
X Open the hood (Y page 248).
X Remove tool 0085for unlocking tank filler
cap 0043from the footwell on the co-driver's
side (Y page 274).
X Pull cover 0087up, turn 90° and release.
X Insert tool 0085into hole 0044of tank filler
cap 0043.
X Turn filler cap 0043counter-clockwise and
remove it. Make sure that tool 0085remains
in tank filler cap 0043while doing so.
X To close: replace filler cap 0043and turn it
clockwise until closed.
X Pull tool 0085out of tank filler cap 0043and
stow with the vehicle tool kit in the footwell
on the co-driver's side.
X Pull cover 0087up over hole 0044of tank filler
cap 0043, turn and release.
X Turn tank filler cap 0043.
If tank filler cap 0043turns freely, the DEF
tank is closed. 148
RefuelingDriving and pa
rking

Display messages
Possible causes/consequences and
0050
0050Solutions 003E
Hood open Hood open You are already driving at walking pace, even though the hood is
not closed.
X Close the hood. 0064
Please enter PIN: Please enter PIN: You have not yet entered your PIN in the mobile phone.
X Enter the PIN for the SIM card. 003E
Doors open Doors open You are already driving at walking pace, even though not all the
doors are closed.
X Close the doors. 00B1
Check wash. fluid Check wash. fluid
level level The washer fluid level is too low.
X Add washer fluid (Y page 255).Key
Display messages
Possible causes/consequences and
0050
0050Solutions 0039
Replace key Visit Replace key Visit
workshop workshop The key is no longer working.
X Visit a qualified specialist workshop. Indicator and warning lamps in the instrument cluster
When switching on the ignition, some systems carry out a self-test. Some indicator and warn- ing lamps may temporarily turn on or start to flash. This is not an indication of any problem.
Only when these indicator and warning lights turn on or start flashing after the engine has
started or during the journey has a malfunction occurred. Indicator and warning lamps in the inst
rumentcluster
217On-board computer and displays Z

Problem
Possible causes/consequences and
0050
0050Solutions 0076
The red seat belt
warning lamp
lights up contin-
uously or
flashes. A warn-
ing tone may
also sound. The warning lamp is to remind you to fasten your seat belt.
X Fasten seat belt (Y page 45). 0049
When the key is
turned to posi-
tion2in the igni-
tion lock, the
yellow bulb
warning lamp
lights up. One of the exterior lighting bulbs is faulty, with the exception of the
perimeter lamps and the trailer lighting.
i Depending on the equipment, the bulb failure indicator can fail
for all lamps with the exception of the turn signal lamps.
X Replace the faulty bulb as soon as possible (Y page 99).003E
The yellow "door
open" indicator
lamp is lit while
driving. The vehicle is moving without all doors or the hood being closed.
X Close the doors or hood. 003E
The yellow "door
open" indicator
lamp is lit. The electrical step has retracted or extended only partially or not
at all.
X Make sure there is sufficient free space for the electrical step.
X Open or close the sliding door again.
X If the electrical step still does not extend or retract fully, push
the step in manually (Y page 74). Before stepping out, remind
the passengers that the step is missing. Indicator and warning lamps in the instrument cluster
227On-board computer and displays Z

Useful information
This Operator's Manual describes all models
as well as standard and optional equipment of your vehicle that were available at the time of going to print. Country-specific variations are
possible. Note that your vehicle may not be
equipped with all of the described functions.
This also applies to systems and functions
relevant to safety.
Read the information on qualified specialist
workshops (Y page 25). Engine compartment
Hood
Important safety notes G
WARNING
If the hood is unlatched, it may open up when the vehicle is in motion and block your view.
There is a risk of an accident.
Never unlatch the hood while driving. G
WARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department. G
WARNING
The engine compartment contains moving
components. Certain components, such as
the radiator fan, may continue to run or start
again suddenly when the ignition is off. There is a risk of injury. If you need to do any work inside the engine
compartment:
R switch off the ignition
R never reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
R remove jewelry and watches
R keep items of clothing and hair, for exam-
ple, away from moving parts G
WARNING
The fuel injection system operates with a high voltage. If you touch the live components, you could receive an electric shock. There is a risk
of injury.
Never touch components of the fuel injection
system when the ignition is switched on.
The live components of the fuel injection sys-
tem are, for example, the injectors. G
WARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very hot.
Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down and touch only the components described in the
following.
If you have to carry out work in the engine
compartment, only touch the following com-
ponents:
R Hood
R Oil dipstick
R Engine oil filler neck cap
R Washer fluid reservoir cap
R Coolant expansion tank cap
Opening the hood !
Make sure that the windshield wipers are
not folded away from the windshield. You
could otherwise damage the windshield
wipers or the hood. 248
Engine compartmentMaintenance and care

Hood release lever in the driver's footwell
Observe the safety notes when you open the
hood.
X Stop your vehicle as far away from traffic as
possible on level ground.
X Switch off the engine.
X Secure the vehicle to prevent it from rolling
away.
X Pull release handle 0043on the hood.
The hood is released. X
Reach into the gap and push lever 0044on the
hood catch up. X
Swing the hood upwards until support strut
0087 engages and the hood is supported.
Closing the hood G
WARNING
If the hood is unlatched, it could tip forward
during rapid deceleration of the vehicle and
hit persons or objects within its path. There is
a risk of an accident and injury.
Therefore, always make sure that the hood is closed and locked completely before driving
off.
If the hood is not locked and you are already
driving at walking pace:
R the yellow 003Eindicator lamp in the
instrument cluster goes on for vehicles
without steering-wheel buttons.
R the 003E Hood open
Hood open display appears for
vehicles with steering-wheel buttons.
! When you press the support strut back,
make sure that you do not press it against
the detent position and cause it to bend.
! Do not use your hands to push the hood
down. You could damage it otherwise.
X Lift the hood slightly.
X Press support strut 0087towards the back.
X Lower the hood and allow it to fall with
momentum from a height of approximately
1 ft (30 cm).
The hood locks audibly.
X Check that the hood is correctly locked.
If the hood can be raised slightly, it is not
properly engaged. If the hood is not cor-
rectly engaged, open the hood again. Let
the hood fall with a little more momentum. Engine compartment
249Maintenance and care Z

Example: 6-cylinder diesel engine
For vehicles with a red oil dipstick, only checkthe oil level when the engine is at normal
operating temperature:
X Stop your vehicle as far away from traffic as
possible on level ground.
X Secure the vehicle to prevent it from rolling
away.
X Switch off the engine.
X Wait 5 minutes.
For vehicles with a yellow oil dipstick, only
check the oil level when the engine is cold.
X Stop your vehicle as far away from traffic as
possible on level ground.
X Secure the vehicle to prevent it from rolling
away.
X Open the hood (Y page 248).
X Pull out oil dipstick 0043.
X Wipe oil dipstick 0043using a lint-free cloth.
X Insert oil dipstick 0043back into the guide
tube as far as it will go and remove it again.
If the level is between minimum mark 0087
and maximum mark 0044, the oil level is cor-
rect.
X If the oil level has dropped to or below min-
imum mark 0087, open cap 0085and add
engine oil (Y page 252).
The difference in quantity between
marks 0044and 0087is approximately
2 US quarts (2 liters).
X Insert the oil dipstick into the guide tube as
far as it will go.
X Close the hood (Y page 249). OM651 4-cylinder diesel engine:
At outside temperatures between 32 ‡
(–0 †) and 86 ‡ (30 †), the oil level can be
checked when the engine is cold.
Measuring the engine oil when the engine is
cold is less precise than measuring when the
engine is at normal operating temperature.
When the appropriate warning is shown in the
display
X Add engine oil (Y page 252)
or X Have engine oil siphoned off.
Add engine oil G
WARNING
If engine oil comes into contact with hot com- ponents in the engine compartment, it may
ignite. There is a risk of fire and injury.
Make sure that engine oil is not spilled next to
the filler neck. Let the engine cool down and
thoroughly clean the engine oil off the com-
ponents before starting the engine.
! The alternator is located below the engine
oil filler neck. If engine oil spills onto the
alternator, there is a danger of alternator
damage. Be very careful when adding
engine oil. H
Environmental note
When adding oil, take care not to spill any. If
oil enters the soil or waterways, it is harmful to the environment.
! Do not add too much oil. adding too much
engine oil can result in damage to the
engine or to the catalytic converter. Have
excess engine oil siphoned off.
! Do not use any additives in the engine oil.
This could damage the engine.
X Open the hood (Y page 248).
X Unscrew and remove cap 0085.
X Add engine oil. 252
Engine compartmentMaintenance and care

X
Replace cap 0085on the filler neck and
tighten.
When doing so, make sure that the cap
engages correctly.
X Check the oil level with the oil dipstick
(Y page 251) or on the display
(Y page 250).
X Close the hood. Coolant
G
WARNING
The engine cooling system is pressurized, par- ticularly when the engine is warm. When
opening the cap, you could be scalded by hotcoolant spraying out. There is a risk of injury.
Let the engine cool down before opening the
cap. Wear eye and hand protection when
opening the cap. Open the cap slowly half a
turn to allow pressure to escape.
Only check the coolant level and/or fill the
coolant if the vehicle is on a level surface and the engine has cooled down. The coolant tem-
perature must be below 122 ‡ (50 †).
! Check the engine cooling and heating sys-
tem regularly for leaks.
If a large quantity of coolant is lost, have the
cause traced and rectified at a qualified
specialist workshop. G
WARNING
Coolant contains glycol and is therefore toxic. Do not swallow the coolant. See a doctor
immediately if you swallow coolant.
Make sure that coolant does not come into
contact with skin, eyes or clothing. In case of
contact with eyes, rinse immediately with
plenty of clean water. Clean affected areas of skin and clothing with soap and water imme-
diately. Change any affected clothing imme-
diately. G
WARNING
If antifreeze comes into contact with hot com- ponents in the engine compartment, it may
ignite. There is a risk of fire and injury.
Let the engine cool down before you add anti-
freeze. Make sure that antifreeze is not spilled
next to the filler neck. Thoroughly clean the
antifreeze from components before starting
the engine.
! Take care not to spill any coolant on pain-
ted surfaces. You could otherwise damage
the paintwork. Example: cap and coolant expansion tank
Checking the coolant level
X Stop your vehicle as far away from traffic as
possible on level ground.
X Switch off the engine.
X Secure the vehicle to prevent it from rolling
away.
X Open the hood (Y page 248).
X Slowly turn cap 0043half a turn counter-
clockwise to allow excess pressure to
escape.
X Turn cap 0043further and remove it.
X Check the coolant level.
If the coolant reaches the maximum mark
on coolant expansion tank 0044, there is
enough coolant in coolant expansion
tank 0044. Engine compartment
253Maintenance and care Z

Adding coolant
X If the coolant drops under the minimum
mark on coolant expansion tank 0044, add
coolant to the maximum mark.
Observe the information on coolant mix-
ture ratio and water quality in the "Techni-
cal data" section (Y page 325). To prevent
damage to the engine cooling system, use
only approved corrosion inhibitor/anti-
freeze that comply with the Mercedes-Benz Specifications for Service Products.
X Replace cap 0043and turn it clockwise to
tighten.
X Start the engine.
X After approximately 5 minutes, switch off
the engine and allow it to cool down.
X Check the coolant level again and add cool-
ant if necessary.
X Close the hood. Brake fluid
G
WARNING
Service products may be poisonous and haz-
ardous to health. There is a risk of injury.
Comply with instructions on the use, storage
and disposal of service products on the labels of the respective original containers. Always
store service products sealed in their original containers. Always keep service products out
of the reach of children.
Brake fluid is hazardous to health. Also
observe the safety notes in the "Service prod-
ucts and capacities" section (Y page 318).G
WARNING
The brake fluid constantly absorbs moisture
from the air. This lowers the boiling point of
the brake fluid. If the boiling point of the brake fluid is too low, vapor pockets may form in the brake system when the brakes are applied
hard. This would impair braking efficiency.
There is a risk of an accident. You should have the brake fluid renewed at
the specified intervals.
! Brake fluid corrodes paint, plastic and
rubber. If paint, plastic or rubber has come into contact with brake fluid, rinse with
water immediately.
Have the brake fluid renewed every 2 years at
a qualified specialist workshop. Observe the
information on brake fluid in the "Technical
data" section (Y page 324). Check the brake fluid level regularly, e.g.
weekly or when refueling.
Checking the brake fluid level
X Stop your vehicle as far away from traffic as
possible on level ground.
X Switch off the engine.
X Secure the vehicle to prevent it from rolling
away.
X Open the hood (Y page 248).
X Check the brake fluid level.
The brake fluid level is correct if the level is
between the MIN mark and MAX mark on
brake fluid reservoir 0043.
X Close the hood.
! If the brake fluid level in the brake fluid
reservoir has fallen to the MIN mark or
below, check the brake system immedi-
ately for leaks. Also check the thickness of the brake linings. Visit a qualified specialist
workshop immediately.
Do not add brake fluid. This does not cor-
rect the malfunction. 254
Engine compartmentMaintenance and care