Page 195 of 292

Problem Possible causes/consequences and
0050 Solutions00B4
The yellow
engine oil level
warning lamp
lights up
repeatedly while
the vehicle is in
motion. There is a malfunction in the engine oil level display.
X
Have the vehicle checked immediately at a qualified specialist
workshop. 0041
The yellow
coolant 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 169).
X If you need to add coolant frequently, have the cooling system
checked at a qualified specialist workshop. 00AE
The red coolant
warning lamp
lights up while
the engine is
running. 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. 00AE
The red coolant
warning lamp
lights up while
the engine is
running. The coolant temperature is too high.
If the vehicle is stopped after being subjected to extreme loads
(e.g. driving in mountainous terrain, trailer towing), the coolant
warning lamp may
light up when the ignition is switched on or the
engine is restarted.
X Run the engine for approximately one minute at idling speed.
X Consult a qualified specialist workshop if the coolant warning
lamp remains lit. 00B7
0080
The yellow
reserve fuel
warning lamp
lights up while
driving. The fuel level has fallen into the reserve range.
X
Refuel at the nearest gas station ( Y page 142). Troubleshooting
193
Practical advice Z
Page 196 of 292

Problem Possible causes/consequences and
0050 Solutions00B7
0080
The yellow
reserve fuel
warning lamp
lights up while
the engine is
running and the
display for the
tank content
shows 0, even
though there is
still fuel in the
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. 0028
The yellow
preglow
indicator lamp
lights up while
the engine is
running. There is a malfunction in the preglow system.
X
Consult a qualified specialist workshop. 00BB
The yellow
check engine
indicator lamp
lights up or
flashes while the
engine is
running. 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 142).
X Bleed the fuel system .
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. 00BB
The yellow
check engine
indicator lamp
lights up or
flashes while the
engine is
running. The injection system is malfunctioning.
The engine is running in emergency mode.
Engine power output may be reduced.
X
Have the vehicle checked as soon as possible 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 legal requirements. 194
Troubleshooting
Practical advice
Page 210 of 292

Display messages Possible causes/consequences and
0050 Solutions0063
Check tire(s) 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 Pull over immediately, paying attention to road and traffic
conditions.
X Check the tires.
X Repair or change the wheel if necessary ( Y page 222).
X Check the tire pressure and correct it if necessary
(Y page 280).
The display message disappears automatically after driving for
a few minutes with the corrected tire pressure. 0063
Warning Tire
defect One or more tires is losing air rapidly. If the tire pressure monitor
has detected the affected wheel, the wheel position is also
displayed.
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 222). 0039
Check Immobilizer
Visit workshop The key is no longer working.
X
Visit a qualified specialist workshop. 00B7
Reserve fuel
Drive
to a gas station The fuel level has fallen into the reserve range.
X
Refuel at the nearest gas station ( Y page 142).003E
Doors open You are already driving at walking pace, even though not all the
doors are closed.
X
Close the doors. 00BA
Water in fuel
Visit workshop The water that has collected in the water separator has reached
the maximum level.
X
Drain the water separator ( Y page 221).00BD
Check wash. fluid
level The washer fluid level has dropped to approximately
1
/ 3 of the
reservoir capacity.
X Add washer fluid ( Y page 171).208
Troubleshooting
Practical advice
Page 215 of 292

Problem Possible causes/consequences and
0050 SolutionsThe engine does not
start.
The starter motor can
be heard. There is air in the fuel system.
X
Turn the key back to position 0 in the ignition lock before
attempting to start the engine again.
X Start the engine again.
Please bear in
mind that lengthy and frequent starting attempts
will drain the battery.
If the engine does not start after several attempts:
X Consult a qualified specialist workshop. The engine does not
start.
The starter motor can
be heard. The reserve
fuel warning lamp is lit
and the
fuel
gauge is at
0. The fuel tank has been run dry.
X
Refuel the vehicle.
X Bleed the fuel system . The engine does not
start.
The starter motor
cannot be heard.
The
00BB yellow engine
diagnostic lamp and
the yellow DEF
indicator lamp 00E48
lights up. The exhaust gas aftertreatment is faulty, an emission-relevant
malfunction has occurred or the DEF reserve has been used up.
The engine management prevents the engine from starting.
This malfunction or malfunction can damage the exhaust gas
aftertreatment.
X
Observe the messages in the display:
R
on vehicles without steering-wheel buttons (Y page 199)
R on vehicles with steering-wheel buttons (Y page 202) and
(Y page 204). The engine does not
start.
The starter motor
cannot be heard. The battery isolating switch is switched off.
X
Switch on the power supply ( Y page 88).The engine does not
start.
The starter motor
cannot be heard. The on-board voltage is too low (the battery is too weak or
discharged).
X
Jump-start the vehicle (Y page 247).
If the engine does not start despite attempts to jump-start it:
X Consult a qualified specialist workshop. 8
Only vehicles without steering-wheel buttons. Troubleshooting
213
Practical advice Z
Page 289 of 292
Capacities
Engine with oil
filter Fuel tank DEF tank Cooling
system Windshield/
headlamp
cleaning
system
Engine oil ULTRA-LOW
SULFUR DIESEL Diesel Exhaust
Fluid (DEF)
19 Coolant
20 Washer fluid
with windshield
washer
concentrate
13.21 US qt
(12.5 l) 25.0 US gal
(100 l)
21 3.2 US gal
(12.0 l)/
4.9 US gal
(18.5 l)/
5.8 US gal
(22.0 l)
22 10.75 US qt
(10.0 l) Approx. 6.3 US qt
(6.0 l) 19
DEF according to ISO 22241 . Observe MB Specifications for Service Products,
Sheet No. 352.0.
20 When the coolant is being renewed, the coolant must contain 50 % by volume of anticorrosion/antifreeze
agent. This is equivalent to antifreeze protection down to –34.6 ‡ (–37 †). Do not exceed a ratio of
55 % by volume (antifreeze protection down to approximately –49.0 ‡ (–45 †). Heat dissipation is otherwise
insufficient. Observe the MB Specifications for Service Products, Sheet No. 310.1.
21 Including a reserve of 5.3 US gal (20 l).
22 Chassis Cab only. Capacities
287
Technical data Z