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Display messages Possible causes/consequences and
0050
0050Solutions 00BC
Coolant Coolant
Check
Checklevel
level 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 329).
X If you need to add coolant frequently, have the engine cooling
system checked at a qualified specialist workshop. 00B5
Reserve Reserve
fuel
fuelDrive
Drive
to a filling stat.
to a filling stat. The fuel level has fallen into the reserve range.
X
Refuel at the nearest gas station ( Ypage 148). 00B8
Water in fuel Water in fuel
Visit workshop Visit workshop The water that has collected in the water separator has reached
the maximum level.
X
Drain the water separator (Y page 257).00B2
Engine Engine
oil
oilAdd
Add 1.0
1.0
quart(Canada: 1.0
quart(Canada: 1.0
liter) liter) The oil level is too low.
X
Check the oil level the next time you refuel (Y page 252), and
add oil. 00B2
Engine oil level Engine oil level
Not when eng. run‐ Not when eng. run‐
ning ning You want to check the oil level even though the engine is running.
X
Switch off the engine.
X Check the oil level (Y page 252).00B2
Engine oil level Engine oil level
Reduce oil level Reduce oil level You have added too much engine oil. 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 at the
next qualified specialist workshop.
X If the oil level is correct: have the malfunction rectified at the
next qualified specialist workshop. Display
messages
215On-board computer and displays Z
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Display messages Possible causes/consequences and
0050
0050Solutions 00B2
Engine oil level Engine oil level
Stop, turn engine Stop, turn engine
off off 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
Oil sensor Visit Oil sensor Visit
workshop workshop There is a malfunction in the engine oil level display.
X
Have the vehicle checked immediately at a qualified specialist
workshop. Driving systems
Display messages Possible causes/consequences and
0050 0050Solutions Limit
Limit
... km/h
... km/h The speed display flashes.
The vehicle has exceeded the speed set for variable
SPEEDTRONIC, e.g. on a steep downhill gradient (overrun mode).
X Apply the brakes yourself as required. Cruise control Cruise control
Visit workshop
Visit workshop Cruise control has been deactivated due to a malfunction.
X
Have cruise control checked at a qualified specialist workshop. 216
Display
messagesOn-board computer and displays
Page 219 of 338

Display messages Possible causes/consequences and
0050
0050Solutions Lane
Lane
Keep.
Keep. Assist
Assist
temporarily
temporarily
unavailable unavailable and the
00B0indicator lamp lights up.
Lane Keeping Assist is deactivated and temporarily inoperative.
Possible causes are:
R There are no lane markings present.
R The camera's functionality is impaired due to heavy rain, snow
or fog.
R The camera cannot recognize the road markings:
-It is too dark.
- The lane markings are worn or are covered, for example, by
dirt or snow.
R The windshield is dirty in the camera's field of vision.
X Stop the vehicle paying attention to road and traffic conditions.
X Secure the vehicle to prevent it from rolling away
(Y page 151).
X Clean the windshield (Y page 269), particularly in the camera's
field of vision.
If the 00B0 indicator lamp goes out, Lane Keeping Assist is
operational again. Lane Lane
Keep.
Keep. Assist
Assist
inoperative
inoperative Lane Keeping Assist is faulty.
X
Have Lane Keeping Assist checked at a qualified specialist
workshop. Blind Spot Assist Blind Spot Assist
inoperative inoperative Blind Spot Assist is faulty.
X
Have Blind Spot Assist checked at a qualified specialist work-
shop. Collision Preven‐ Collision Preven‐
tion tion
Assist
Assist inoper‐
inoper‐
ative
ative Collision Prevention Assist is faulty.
X
Have Collision Prevention Assist checked at a qualified special-
ist workshop. Recognition by the radar sensor system can be impaired in the
case of:
R
dirt on the sensors or anything else covering the sensors
R it is snowing or raining heavily
R there is interference from other radar sources
R there are strong radar reflections, for example in parking
garages
R a narrow vehicle is traveling in front, e.g. a motorbike
R a vehicle is traveling in front on a different line
X Clean the radar sensor system area. Display
messages
217On-board computer and displays Z
Page 220 of 338

Tires
Display messages Possible causes/consequences and
0050
0050Solutions Tire pres. Adjust
Tire pres. Adjust
pres. pres.
0054 The pressure is insufficient in one or more tires, or the pressures
of the individual tires differ significantly.
X Check the tire pressure at the next opportunity and correct it if
necessary (Y page 293). Tire pres. Tire pres.
monitor inopera‐ monitor inopera‐
tive tive The tire pressure monitor has malfunctioned.
X
Have the tire pressure monitor and the wheels checked at a
qualified specialist workshop. Tire pres. Tire pres.
monitor currently monitor currently
unavailable unavailable The tire pressure monitor function is temporarily unavailable due
to radio interference or undervoltage.
X Once the causes have been remedied, the tire pressure monitor
is automatically activated. Tire pres.- Tire pres.-
monitor inopera‐ monitor inopera‐
tive No wheel sen‐ tive No wheel sen‐
sors sors The tire pressure monitor is not receiving signals from one or more
wheels because:
R a wheel has been replaced with the spare wheel without wheel
electronics.
R the maximum temperature on one of the wheel electronics units
has been exceeded.
R the wheel electronics are malfunctioning.
X Have the tire pressure monitor and the wheels checked at a
qualified specialist workshop. 218
Display
messagesOn-board computer and displays
Page 221 of 338

Display messages Possible causes/consequences and
0050
0050Solutions Check tire(s)
Check tire(s)
0054 The pressure of one or more tires has dropped significantly. If the
tire pressure monitor has detected the affected wheel, the wheel
position is also displayed.
X
Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Check the tires.
X Repair or change the wheel if necessary (Y page 307).
X Check the tire pressure and correct it if necessary
(Y page 293).
The display message disappears automatically after driving for
a few minutes with the corrected tire pressure. Warning Warning
Tire
Tiredefect
defect
0054 One or more tires is losing air rapidly. If the tire pressure monitor
has detected the affected wheel, the wheel position is also dis-
played.
X
Stop the vehicle without making any sudden steering or braking
maneuvers, paying attention to the traffic conditions as you do
so.
X Repair or change the wheel (Y page 307).Vehicle
Display messages Possible causes/consequences and
0050 0050Solutions 003D
Battery/Alterna‐ Battery/Alterna‐
tor Visit workshop tor Visit workshop The battery is not being charged. Possible causes are a defective
alternator or a torn poly-V-belt.
X
Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Check the poly-V-belt.
X If the poly-V-belt is torn: do not continue driving. Consult a
qualified specialist workshop.
X If the poly-V-belt is not damaged: have the vehicle checked as
soon as possible by a qualified specialist workshop. 00E6
Electrical Step Electrical Step 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. Display
messages
219On-board computer and displays Z
Page 222 of 338
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 ( Ypage 257). 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. 220
Display
messagesOn-board computer and displays
Page 223 of 338

Indicator and warning lamps in the instrument cluster
Problem Possible causes/consequences and
0050
0050Solutions 0072
The yellow ASR/
ESP®
warning
lamp flashes
while the vehicle
is in motion. G
WARNING
ESP ®
or ASR is intervening because at least one of the wheels has
reached its tire grip limit.
Cruise control is deactivated for the duration of the intervention.
X Adapt your driving style to suit the road and traffic conditions.
Do not use too much throttle.
X Drive slowly. 0072
The yellow ASR/
ESP®
warning
lamp is lit while
the engine is
running. ASR is deactivated.
G WARNING
The driven wheels can spin when accelerating.
There is an increased risk of skidding and accidents.
X Activate ASR again. Exceptions (Y page 60).0089
0025003D0065
The yellow ESP ®
, ABS
and ASR/BAS indicator
lamps and the red
brake system indicator
lamp are lit while the
engine is running. EBD is malfunctioning or deactivated due to undervoltage or mal-
function.
The battery may not be being charged.
G WARNING
The rear wheels could lock sooner than expected when you apply
the brakes. The braking distance can increase in emergency brak-
ing situations.
There is an increased risk of skidding and accidents.
X Vehicles with steering wheel buttons: also observe the mes-
sages in the display (Y page 199).
X Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Do not drive on.
X Consult a qualified specialist workshop. Indicator and warning lamps in the instrument cluster
221On-board computer and displays Z
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Problem Possible causes/consequences and
0050
0050Solutions 0065
The red brake
system indicator
lamp is lit while
the engine is
running. There is insufficient brake fluid in the expansion tank.
G WARNING
Braking performance can be impaired.
There is a risk of an accident.
X Vehicles with steering wheel buttons: also observe the mes-
sages in the display (Y page 199).
X Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Check the brake fluid level in the expansion tank
(Y page 256).
X If the brake fluid is below the MIN mark: do not drive on!
X Do not add brake fluid. This does not solve the problem.
X Consult a qualified specialist workshop. 0065
When towing a
trailer: the red
brake system
indicator lamp is
lit while the
engine is run-
ning.
Additionally, a
warning tone
sounds. G
WARNING
The brake force booster in the trailer is faulty.
The driving and braking characteristics of your vehicle could
change. There is a risk of the trailer overbraking and of you losing
control over the truck/trailer combination.
There is a risk of an accident.
X Vehicles with steering wheel buttons: also observe the mes-
sages in the display (Y page 199).
X Stop the vehicle as soon as possible, paying attention to road
and traffic conditions.
X Do not drive on.
X Consult a qualified specialist workshop. 003D
The yellow ASR/
BAS indicator
lamp is lit while
the engine is
running. ASR has been deactivated due to a malfunction.
The engine power output may be reduced.
G WARNING
The driven wheels can spin when accelerating.
There is an increased risk of skidding and accidents.
X Drive on with care.
X Consult a qualified specialist workshop as soon as possible. 222
Indicator and warning lamps in the instrument clusterOn-board computer and displays