Page 357 of 506
355 Practical hints
What to do if …
Where will I find ...?
Unlocking/locking in an emergency
Opening/closing in an emergency
Replacing SmartKey batteries
Replacing bulbs
Replacing wiper blades
Flat tire
Bleeding the fuel system (Diesel engine only)
Batteries
Jump starting
Towing the vehicle
Fuses
Page 360 of 506

358 Practical hintsWhat to do if …Problem
Possible cause
Suggested solution
;
(USA only)
3
(Canada only)
The red brake warning lamp
comes on while driving and you
hear a warning sound.
You are driving with the parking brake set.
Release the parking brake.
Observe the additional message in
the display.
;
(USA only)
3
(Canada only)
The red brake warning lamp
comes on while driving.
There is a malfunction in the SBC brake
system.
There is insufficient brake fluid in the res-
ervoir.
Risk of accident! Do not drive any fur-
ther. Consult a Mercedes-Benz
Service Center. Under no circum-
stances should you top up the brake
fluid. This will not solve the problem.
Warning!
G
Driving with the brake warning lamp illumi-
nated can result in an accident. Have your
brake system checked immediately if the
brake warning lamp stays on. Do not add
brake fluid before checking the brake
system.
Overfilling the brake fluid reservoir can re-
sult 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 361 of 506

359 Practical hints
What to do if …
Problem
Possible cause
Suggested solution
?
(USA only)
±
(Canada only)
The yellow engine malfunction
indicator lamp comes on while
driving.
There is a malfunction in:
The fuel management system
The ignition system (Gasoline engine)
The emission control system
Systems which affect emissions
Such malfunctions may result in excessive
emissions values and may switch the engine
to its limp-home (emergency operation)
mode.
Have the vehicle checked as soon as
possible by an authorized
Mercedes-Benz Center.
An on-board diagnostic connector is
used by the service station to link the
vehicle to the shop diagnostics system.
It allows the accurate identification of
system malfunctions through the read-
out of diagnostic trouble codes. It is lo-
cated in the front left area of the
footwell next to the parking brake.
A loss of pressure has been detected in the
fuel system. The fuel cap may not be closed
properly or the fuel system may be leaky.
Check the fuel cap.
If it is not closed properly:
Close the fuel cap.
If it is closed properly:
Have the fuel system checked by an au-
thorized Mercedes-Benz Center.
Page 362 of 506
360 Practical hintsWhat to do if …?
(USA only)
±
(Canada only)
The yellow engine malfunction
indicator lamp comes on while
driving.
Your fuel tank is empty.
After refuelling start, turn off and re-
start the engine three or four times in
succession.
The limp-home mode is canceled. You do
not need to have your vehicle checked.
Diesel engine: The fuel tank is empty. The en-
gine is running in emergency operation
mode.
Bleed the fuel system (
page 432).
The limp-home mode is canceled. You do
not need to have your vehicle checked.
Diesel engine: The diesel engine electronics
are malfunctioning.
Full engine performance is not available.
Have the fuel system checked by an au-
thorized Mercedes-Benz Center.
Problem
Possible cause
Suggested solution
Page 363 of 506

361 Practical hints
What to do if …
Problem
Possible cause
Suggested solution
D
The red coolant warning lamp
comes on when the engine is
running.
There is insufficient coolant in the reservoir.
If this warning lamp comes on frequently,
there is a leak in the cooling system.
If the coolant level is correct, the electric ra-
diator fan may be broken.
Immediately add coolant to prevent
engine from overheating
(page 308).
Have the cooling system checked.
If the coolant temperature is below
257°F (125°C), you can continue
driving to the nearest authorized
Mercedes-Benz Center.
Avoid high engine loads (e.g. driving
uphill) and stop-and-go driving.
D
The red coolant warning lamp
comes on while driving and you
hear a warning sound.
The coolant temperature has exceeded
257°F (125°C).
Stop as soon as possible and allow
the engine and coolant to cool down.
l
The red DTR warning lamp
comes on while driving.
You are too close to the vehicle in front of you
to maintain selected speed.
Apply the brakes immediately to in-
crease the following distance.
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.
Page 364 of 506

362 Practical hintsWhat to do if …Problem
Possible cause
Suggested solution
l
The red DTR warning lamp
comes on while driving and you
hear a warning chime sound.
You are gaining too rapidly on the vehicle
ahead of you.
The distance warning system has recog-
nized a stationary obstacle on your prob-
able line of travel.
Apply the brakes immediately.
Carefully observe the traffic situation.
You may need to brake or maneuver
to avoid hitting an obstacle.
W
The yellow fuel tank reserve
warning lamp comes on while
driving.
The fuel level has gone below the reserve
mark.
Refuel at the next gas station
(page 299).
<
The red seat belt telltale comes
on after starting the engine with
all doors closed.
The seat belt telltale reminds you and your
front passenger to fasten your seat belts be-
fore driving off.
Fasten your seat belts.
The red seat belt telltale flashes
and you additionally hear an in-
termittent warning signal with in-
creasing intensity for a maximum
of 60 seconds when the vehicle’s
speed exceeds 15 mph
(25 km/h).
You and/or your front passenger have for-
gotten to fasten your seat belts.
There are items placed on the front passen-
ger seat and therefore the system senses the
front passenger seat as being occupied.
Fasten your seat belts.
Remove the items from the front pas-
senger seat and put them in a safe
place.
Page 373 of 506
371 Practical hints
What to do if …
Display
Display message
Possible cause
Possible solution
Distronic
Currently unavailable
See Operator’s Manual
DISTRONIC* is switched off if:
the DISTRONIC cover in the area
of the radiator grille is dirty
the functionality is impaired by
heavy rain or thick fog
If necessary, clean the DISTRONIC cover in
the area of the radiator grille.
Restart the vehicle.
or
DISTRONIC* becomes operational again with-
out the engine being restarted when:
dirt on the grille falls off while driving (e.g.
slush or snow)
the system recognizes full sensor availabili-
ty (due to lessening rain or the road surface
drying)
the message in the multifunction display
disappears
the speed last stored flashes in the display
for five seconds.
You can operate DISTRONIC* as usual again.
Page 375 of 506
373 Practical hints
What to do if …
Display
Display message
Possible cause
Possible solution
ESP
Display malfunction
Visit workshop
The ESP or the ESP display is mal-
functioning.
Continue driving with added caution.
Have the system checked at an authorized
Mercedes-Benz Center as soon as possible.
Failure to follow these instructions increases
the risk of an accident.
P
Gear selector lever
in Park
You have attempted to turn off the
engine with the KEYLESS-GO*
start/stop button with the gear se-
lector lever not inP. You have
opened the driver's door with the
gear selector lever not inP.
Place the gear selector lever in positionP.
P/N
Shift to Neutral or Park
You have attempted to start the en-
gine with the KEYLESS-GO*
start/stop button while the gear se-
lector lever was in positionR orD.
Place the gear selector lever in positionP
orN. Make sure the brake pedal is de-
pressed.