Problem Possible causes/consequences and
0050
0050Solutions 00B2
The yellow
engine oil level
warning lamp
flashes and the
warning buzzer
sounds after the
engine is started
or while the vehi-
cle is in motion. On vehicles with a diesel engine, the oil level display additionally
appears in the display, e.g.
– 2.0 qts
– 2.0 qts (Canada:– 2.0 ltr – 2.0 ltr).
There is not enough or no oil in the engine.
There is a danger of engine damage.
X Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Check the oil level with the oil dipstick (Y page 253).
X If the engine oil level is correct: have the malfunction rectified
immediately at a qualified specialist workshop.
X If the engine oil level is too low: have the vehicle towed to a
qualified specialist workshop. 00B2
The yellow
engine oil level
warning lamp
lights up and the
warning buzzer
sounds after the
engine is started
or while the vehi-
cle is in motion. The engine oil level is above the maximum level.
There is a risk of damaging the engine or catalytic converter.
X
Check the oil level.
X If the oil level is too high: have the engine oil extracted as soon
as possible at a qualified specialist workshop.
X If the oil level is correct: have the malfunction rectified as soon
as possible at a qualified specialist workshop. 00B2
On vehicles with
a diesel engine,
the yellow
engine oil level
warning lamp
lights up repeat-
edly during the
journey. There is a malfunction in the engine oil level display.
X
Have the vehicle checked immediately at a qualified specialist
workshop. 003F
The yellow cool-
ant level warning
lamp lights up
while the engine
is running. The coolant level is too low.
Never run the engine if the coolant level is too low. The engine
could overheat and be damaged.
X
Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Switch off the engine and let it cool down.
X Add coolant and be sure to observe the warning notes
(Y page 255).
X If you need to add coolant frequently, have the engine cooling
system checked at a qualified specialist workshop. 226
Indicator and warning lamps in the instrument clusterOn-board computer and displays
Problem Possible causes/consequences and
0050
0050Solutions 00AC
The red coolant
warning lamp is
lit while the
engine is run-
ning. The coolant temperature is too high.
X
Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Consult a qualified specialist workshop. 00AC
The red coolant
warning lamp is
lit while the
engine is run-
ning. The coolant temperature is too high.
If the vehicle is stopped after being subjected to extreme loads,
the coolant warning lamp may come on when the ignition is
switched on or the engine is restarted. Such loads can be, for
example, driving in mountainous terrain or driving with a trailer.
X
Run the engine for approximately 1 minute at idling speed.
X Consult a qualified specialist workshop if the display message
continues to be shown. 00B5
0077
The yellow
reserve fuel
warning lamp is
on. At the same
time,
0 0, appears
in the fuel tank
content display
while the engine
is running,
although there is
fuel in the fuel
tank. The fuel filler cap is not closed.
X
Close the fuel filler cap.
You will hear a click when the fuel filler cap is closed fully.
X If the malfunction continues to be displayed, have it rectified
immediately at a qualified specialist workshop. 00B9
The yellow
engine diagnos-
tic indicator
lamp is lit up or
flashes while the
engine is run-
ning. You have used up all fuel in the tank.
The engine is running in emergency mode.
X
Refuel at the nearest gas station (Y page 148).
X Bleed the fuel system (Y page 143).
X Start the engine three to four times in succession after refueling.
Emergency running mode will be canceled. The vehicle does not
need to be checked. 00B9
The yellow
engine diagnos-
tic indicator
lamp is lit up or
flashes while the
engine is run-
ning. The injection control is malfunctioning.
The engine is running in emergency mode.
Engine power output may be reduced.
X
Have the vehicle checked at a qualified specialist workshop as
soon as possible.
In some states it is legally prescribed that after the check engine
indicator lamp lights up you must contact a qualified specialist
workshop immediately. Observe the legal requirements. Indicator and warning lamps in the instrument cluster
227On-board computer and displays Z
Problem Possible causes/consequences and
0050
0050Solutions 00B9
The yellow
Check Engine
indicator lamp is
lit while the
engine is run-
ning. The exhaust gas aftertreatment is malfunctioning or an emission
relevant malfunction has occurred. This malfunction or defect can
damage the exhaust gas aftertreatment.
After the first message and under normal operating conditions,
you can drive on for up to approximately 500 mi (800 km). Then
a warning tone sequence sounds and the engine can only be
started another 16 times.
X
Observe the messages in the display.
X Have the exhaust gas aftertreatment checked immediately at a
qualified specialist workshop.
In some states it is legally prescribed that after the check engine
indicator lamp lights up you must contact a qualified specialist
workshop immediately. Observe the legal requirements. 0028
If you turn the
key to posi-
tion2in the igni-
tion lock, the
yellow preglow
indicator lamp
remains lit for
approximately
1 minute. Or the
yellow preglow
indicator lamp
lights up for
approximately
1 minute while
the engine is
running. At extremely low temperatures, the engine may not start.
There is a malfunction in the preglow system.
X
Have any malfunction rectified at a qualified specialist work-
shop. 009F
The yellow air fil-
ter indicator
lamp is lit while
the engine is
running. The service limit for the air filter has been reached. The air filter
is dirty.
X
Have the air filter element replaced as soon as possible at a
qualified specialist workshop. 228
Indicator and warning lamps in the instrument clusterOn-board computer and displays
Problem Possible causes/consequences and
0050
0050Solutions 0076
If you turn the
key in the igni-
tion lock to posi-
tion2, the red
seat belt warn-
ing lamp lights
up for approx-
imately
6 seconds. The warning lamp is to remind you to fasten your seat belt.
X
Fasten seat belt (Y page 48).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 100).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. 230
Indicator and warning lamps in the instrument clusterOn-board computer and displays
Washer fluid
G
WARNING
Windshield washer concentrate is highly flam-
mable. If it comes into contact with hot engine
components or the exhaust system it could
ignite. There is a risk of fire and injury.
Make sure that no windshield washer con-
centrate is spilled next to the filler neck.
! Only use washer fluid that is suitable for
plastic lamp lenses, e.g. MB SummerFit or
MB WinterFit. Unsuitable washer fluid
could damage the plastic lenses of the
headlamps. Example: washer fluid reservoir
Add windshield washer concentrate to the
washer fluid all year round. Observe the infor-
mation on washer fluid in the "Technical data"
section (Y
page 330).
Adding washer fluid
X Mix the washer fluid to the appropriate mix-
ing ratio in a container beforehand.
X Open the hood (Y page 250).
X Pull cap 0043on the washer fluid reservoir
upwards at the tab.
X Add the premixed washer fluid.
X Press cap 0043onto the filler neck until it
engages audibly.
X Close the hood. Fuel system
Draining the fuel filter G
WARNING
Fuel is highly flammable. Improper handling
of fuel creates a risk of fire and explosion.
Avoid fire, open flames, smoking and creating
sparks under all circumstances. Switch off the
ignition and auxiliary heating before carrying
out work to the fuel system. Always wear pro-
tective gloves. H
Environmental note
Dispose of the water-fuel mixture in an envi-
ronmentally responsible manner.
! When the 00B8indicator lamp lights up,
drain the fuel filter with water separator
immediately. Otherwise, the engine may be
damaged. If the
00B8 indicator lamp in the instrument
cluster goes on, drain the fuel filter with water
separator 0087immediately.
i We recommend that you have this main-
tenance work carried out at a qualified spe-
cialist workshop.
X Park the vehicle safely and secure it from
rolling away.
X Switch off the auxiliary heating system .
X Switch off the engine.
X Open the hood (Y page 250).
X Place a suitable receptacle under drain
hose 0043. Engine compartment
257Maintenance and care Z
notes on the recommended tire pressure
(Y
page 290).
The tire pressure monitor is not able to warn
you of a sudden loss of pressure, e.g. follow-
ing penetration by a foreign object. In this
event, brake the vehicle until it comes to a
standstill. Do not carry out any sudden steer-
ing maneuvers.
The tire pressure monitor has a yellow 0077
warning lamp in the instrument cluster for
indicating pressure loss/malfunctions (USA)
or pressure loss (Canada). Depending on how
the warning lamp flashes or lights up, an
underinflated tire or a malfunction in the tire
pressure monitor is displayed:
R if the 0077 warning lamp is lit continuously,
the tire pressure on one or more tires is
significantly too low. The tire pressure mon-
itor is not malfunctioning.
R USA only: if the 0077warning lamp flashes
for 60 seconds and then remains lit con-
stantly, the tire pressure monitor is mal-
functioning.
Only vehicles with steering wheel buttons: the
on-board computer displays information on
tire pressure. After a few minutes of driving,
the current tire pressure of each tire is shown
in the on-board computer.
USA only: if the tire pressure monitor is mal-
functioning, it may be more than 10 minutes
before the malfunction is shown. The 0077
tire pressure warning lamp flashes for
60 seconds and then remains lit. When the
malfunction has been rectified, the 0077tire
pressure warning lamp goes out after a few
minutes of driving.
The tire pressure values indicated by the on-
board computer may differ from those meas-
ured at a gas station with a pressure gauge.
The tire pressures shown by the on-board
computer refer to those measured at sea
level. At high altitudes, the tire pressure value
indicated by a pressure gauge are higher than
those shown by the on-board computer. In
this case, do not reduce the tire pressures. If radio transmitting equipment (e.g. wireless
headphones, two-way radios) is operated
inside the vehicle or in the vicinity of the vehi-
cle, this can interfere with the operation of
the tire pressure monitor.
Checking the tire pressure electroni-
cally (vehicles with steering wheel but-
tons) Tire pressure display
Using the steering wheel buttons
X
Turn the key to position 2in the ignition
lock.
X Press the 0080or007F button repeatedly
until the standard display is shown
(Y page 189).
X Press the 0041or0068 button repeatedly
until the current pressure of the individual
tires is shown in the display.
If the vehicle is parked for longer than
20 minutes or you then drive at less than
18 mph (30 km/h), the Tire pres. dis‐
Tire pres. dis‐
played after driving for several played after driving for several
minutes minutes message appears.
i The tire pressure value shown in the dis-
play may differ from those measured at a
gas station using a pressure gauge. The on-
board computer will generally give you a
more exact value.
Tire pressure loss warning system Vehicles with steering wheel buttons
If the tire pressure monitor detects a signifi-
cant pressure loss on one or more tires, the
on-board computer displays a warning mes-
sage. The 0077tire pressure loss warning 294
Tire pressureWheels and tires
lamp in the instrument cluster (Y
page 229)
lights up.
The tire pressure is shown in 2 red rectangles.
The pressure of the tire concerned is shown
in one of the two rectangles (Y page 199).
Additionally, a warning tone sounds.
Each tire that is affected by a significant loss
of pressure is highlighted in the pressure dis-
play.
Restarting the tire pressure monitor When you restart the tire pressure monitor,
the currently set tire pressure are taken as
reference values for monitoring.
In most cases, the tire pressure monitor
detects the new reference values automati-
cally, e.g. after you have:
R changed the tire pressure
R mounted
R mounted new wheels or tires
However, you can also define reference val-
ues manually as described here.
Before restarting the tire pressure moni-
tor:
X Set the tire pressure to the value recom-
mended on the Tire and Loading Informa-
tion placard or the tire pressure table on
the B-pillar on the driver's side
(Y page 290).
Observe the notes on tire pressure when
doing so (Y page 290).
X Make sure that the tire pressure is correct
on all four wheels. Restarting the tire pressure monitor
(vehicles without steering wheel but-
tons):
X
Turn the key to position 2in the ignition
lock.
X Press the 0079menu button on the instru-
ment cluster repeatedly until the display
shows the following message:
+CAL- TPMS
+CAL- TPMS
X Press the 0074button on the instrument clus-
ter.
The display shows:
OK TPMS OK TPMS
The tire pressure monitor activation proc-
ess has begun. The tire pressures meas-
ured for the individual wheels are stored as
the new reference values, provided that the
tire pressure monitor considers them to be
plausible.
If you wish to cancel the restart:
X Press the 0075button or the 0079menu button
on the instrument cluster.
The activation process is canceled auto-
matically if 30 seconds elapse without
input.
Restarting the tire pressure monitor
(vehicles with steering wheel buttons):
X Turn the key to position 2in the ignition
lock.
X Press the 0080or007F button on the steer-
ing wheel repeatedly until the standard dis-
play is shown ( Ypage 189).
X Press the 0041or0068 button on the steer-
ing wheel repeatedly until the current pres-
sure of the individual tires is displayed or
the display shows the following message:
Tire Tire pres.
pres. displayed
displayed after
afterdriving
driving
for several minutes
for several minutes
X Press the 0045reset button on the instru-
ment cluster.
The display shows the following message: Tire pressure
295Wheels and tires Z