Page 397 of 521
396 Practical hintsWhat to do if …Display messages
Possible cause/con-
sequence
Possible solution
Front passenger
airbag
deactivated
See Operator’s Manual
Monitor the 75 indicator lamp on the center console (
page 27) and the
multifunction display in the instrument cluster (
page 26) for the following:
With the seat unoccupied and the ignition turned on,
the 75 indicator lamp on the center console should illuminate and re-
main illuminated, indicating that the OCS (
page 81) has deactivated the front
passenger front air bag.
the message
Front passenger airbag activated See Operator’s Manual
or
the message
Front passenger airbag deactivated See Operator’s Manual
should not appear in the multifunction display at any time the seat is unoccu-
pied. Wait at last 60 seconds for the system to complete the necessary check
cycles and to make sure neither message appears in the multifunction display.
If above conditions are met, you can occupy the front passenger seat again. De-
pending on the front passenger classification sensed by the OCS (
page 81), the
75 indicator lamp will remain illuminated or go out.
If above conditions are not met, the system is not working properly. Have the sys-
tem checked as soon as possible by an authorized Mercedes-Benz Center.
Warning!
G
If the 75 indicator lamp remains
illuminated with an adult occupant on the
front passenger seat even after performing
the above corrective steps, do not have any
passenger use the front passenger seat until
the system has been repaired.
Page 403 of 521
402 Practical hintsWhat to do if …Display symbol
Display messages
Possible cause/consequence
Possible solution
(USA only);(Canada only)3
Brake fluid
Visit workshop
There is insufficient brake fluid in the
reservoir.
Risk of accident! Stop the vehicle in a
safe location as soon as it is safe to do
so and notify an authorized
Mercedes-Benz Center. Do not add
brake fluid! This will not solve the
problem.
Warning!
G
Driving with the message
Brake fluid
Visit workshop
displayed can result in an
accident. Have your brake system checked
immediately.
If there is a malfunction in the electrohy-
draulic brake system, we recommend that
the vehicle be transported with all wheels
off the ground using flatbed or appropriate
wheel lift/dolly equipment.
A tow bar must be used if circumstances do
not permit the use of the recommended
towing methods and the vehicle requires
towing with all four wheels on the ground.
Towing the vehicle with all four wheels on
the ground is only permissible for distances
u p t o 3 0 m i l e s ( 5 0 k m ) a n d a t a s p e e d n o t t o
exceed 30 mph (50 km / h). For more infor-
mation, refer to “Towing the vehicle”
(page 457).
If the electrohydraulic brake system enters
its emergency operation mode, the driver
must apply significantly greater brake pedal
pressure and depress the pedal much fur-
ther than normal to obtain braking effect. If
necessary, apply full pressure to the brake
pedal. Brakes may only be applied to the
front wheels. Stopping distance is in-
creased!
Do not add brake fluid before checking the
brake system. Overfilling the brake fluid res-
ervoir can result in spilling brake fluid on hot
engine parts and the brake fluid catching
fire. You can be seriously burned.!If you find that the brake fluid in the
brake fluid reservoir has fallen to the
minimum mark or below, have the
brake system checked for brake pad
thickness and leaks.
Page 404 of 521
403 Practical hints
What to do if …
Display symbol
Display messages
Possible cause/consequence
Possible solution
ú
(USA only)
±
(Canada only)
Engine
Service
There may be a malfunction in the:
fuel injection system
ignition system (Gasoline engine)
exhaust system
fuel system
Have the measuring system checked
by an authorized Mercedes-Benz
Center.
B
Coolant
Check level
The coolant level is too low.
Add coolant (
page 325).
If you have to add coolant frequently,
have the cooling system checked by
an authorized Mercedes-Benz Center.
Warning!
G
Do not spill antifreeze on hot engine parts.
Antifreeze contains ethylene glycol which
may burn if it comes into contact with hot
engine parts. You can be seriously burned.
!Do not ignore the low engine coolant
level warning. Extended driving with
the message and symbol displayed
may cause serious engine damage not
covered by the Mercedes-Benz Limited
Warranty.
Do not drive without sufficient amount
of coolant in the cooling system. The
engine will overheat causing major en-
gine damage.
Page 405 of 521
404 Practical hintsWhat to do if …
During severe operation conditions and
stop-and-go city traffic, the coolant tem-
perature may rise close to 248°F (120°C).
Display symbol
Display messages
Possible cause/consequence
Possible solution
Ï
Coolant
Stop, engine off
The coolant is too hot.
Stop the vehicle in a safe location or
as soon as it is safe to do so.
Only start the engine again after the
message disappears. You could other-
wise damage the engine.
Warning!
G
Driving when your engine is badly overheat-
ed can cause some fluids which may have
leaked into the engine compartment to
catch fire. You could be seriously burned.
Steam from an overheated engine can cause
serious burns and can occur just by opening
the engine hood. Stay away from the engine
if you see or hear steam coming from it.
Turn off the engine, get out of the vehicle
and do not stand near the vehicle until the
engine has cooled down.
!The engine should not be operated with
the coolant temperature above 248°F
(120°C). Doing so may cause serious
damage which is not covered by the
Mercedes-Benz Limited Warranty.
Page 407 of 521
406 Practical hintsWhat to do if …Display symbol
Display messages
Possible cause/consequence
Possible solution
G
Display malfunction
Visit workshop
The displays for several systems have
malfunctioned. Some systems them-
selves may also have malfunctioned.
Continue driving with added caution.
When the display is malfunctioning,
warnings and malfunction messages
might not be displayed.
Have the electronic systems checked
by an authorized Mercedes-Benz
Center.
±
Display malfunction
Visit workshop
Certain electronic systems are unable to
relay information to the control system.
The following systems may have failed:
Coolant temperature display
Tachometer
Cruise control display
Have the electronic systems checked
by an authorized Mercedes-Benz
Center.
J
Doors open
You are attempting to drive with one or
more doors open.
Close the doors.
Page 408 of 521
407 Practical hints
What to do if …
When the message
Add 1 Qt.
(Canada:
1 Liter
) engine oil at next
refueling
(E320CDI, E500, E55AMG)
or
Check oil level at next refueling
(E 350) appears while the engine is run-
ning and at operating temperature, the en-
gine oil level has dropped to approximately
the minimum level.When this occurs, the warning will first
come on intermittently and then stay on if
the oil level drops further.
Visually check for oil leaks. If no obvious oil
leaks are noted, drive to the nearest ser-
vice station where the engine oil should be
topped to the required level with an ap-
proved oil specified in the Factory Ap-
proved Service Products pamphlet.
Display symbol
Display messages
Possible cause/consequence
Possible solution
:
USA only:Add 1 Qt. engine oil
at next refuelingCanada only:Add 1 Liter engine oil
at next refueling
E 320 CDI, E 500, E 55 AMG only:
The engine oil level is too low.
Check the engine oil level
(page 321) and add engine oil as re-
quired (
page 323).
If you must add engine oil frequently,
have the engine checked for possible
leaks.
Check oil level
at next refueling
E 350 only:
The engine oil has dropped to a critical
level.
Check the engine oil level
(page 322) and add oil as required
(page 323).
If you must add engine oil frequently,
have the engine checked for possible
leaks.!The engine oil level warnings should
not be ignored. Extended driving with
the symbol displayed could result in
serious engine damage that is not
covered by the Mercedes-Benz Limited
Warranty.
Page 417 of 521
416 Practical hintsWhat to do if …Display symbol
Display messages
Possible cause/consequence
Possible solution
H
Please rectify
tire pressure
The pressure is too low in one or
more tires.
Check and correct tire inflation pressure as
required (
page 339).
Tire pressure
Caution, tire defect
One or more tires are deflating.
Carefully bring the vehicle to a halt, avoiding
abrupt steering and braking maneuvers.
If necessary, change the wheel (
page 441).
Tire pressure
Check tires
The tire pressure in one or more
tires is already below the mini-
mum value.
Carefully bring the vehicle to a halt, avoiding
abrupt steering and braking maneuvers.
Check and adjust tire pressure as required.
If necessary, change the wheel (
page 441).
Warning!
G
Do not drive with a flat tire. A flat tire affects
the ability to steer or brake the vehicle. You
may lose control of the vehicle. Continued
driving with a flat tire will cause excessive
heat build-up and possibly a fire.
Page 419 of 521
418 Practical hintsWhat to do if …Display symbol
Display messages
Possible cause/consequence
Possible solution
L
Tele Aid malfunction
Drive to workshop
One or more main functions of the
Tele Aid system are malfunctioning.
Have the Tele Aid system checked by
an authorized Mercedes-Benz Center.
1
Restraint system
malfunction
Visit workshop
The system is malfunctioning.
Drive with added caution to the near-
est authorized Mercedes-Benz Cen-
ter.
Warning!
G
In the event a malfunction of the SRS is indi-
cated as outlined above, the SRS may not be
operational.
For your safety, we strongly recommend
that you visit an authorized Mercedes-Benz
Center immediately to have the system
checked; otherwise the SRS may not be
activated when needed in an accident,
which could result in serious or fatal injury,
or it might deploy unexpectedly and unnec-
essarily which could also result in injury.
