Page 377 of 473

376 Practical hintsWhat to do if …When the message
Add 1 qt engine oil
at next refueling (Canada:
1l
) appears
while the engine is running and at
operating temperature, the engine 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.
If no oil leaks are noted, continue to drive
to the nearest service station where the
engine oil should be topped to the required
level with an approved oil specified in the
Factory Approved Service Products pam-
phlet.
Left display
Right display
Possible cause/consequence
Possible solution
N
Engine oil level
Cannot
measure
engine oil level
Vehicles with engine oil measuring
system only:
The measuring system is malfunc-
tioning.
Have the measuring system checked by an
authorized Mercedes-Benz Center.
Engine oil level
Check level
Vehicles with oil dipstick only:
The engine oil has dropped to a crit-
ical level.
Check the engine oil level (
page 276) and
add oil as required (
page 278).
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 dis-
played could result in serious engine damage
that is not covered by the Mercedes-Benz Limit-
ed Warranty.
Page 378 of 473
377 Practical hints
What to do if …
Left display
Right display
Possible cause/consequence
Possible solution
A
Fuel cap
open
A loss of pressure has been detect-
ed in the fuel system. The fuel cap
may not be closed properly or the
fuel system may be leaky.
Check the fuel cap (
page 271).
If it is not closed properly:
Close the fuel cap.
If it is closed properly:
Have the fuel system checked by an autho-
rized Mercedes-Benz Center.
K
being lowered
The retractable hardtop is not com-
pletely opened or closed. The roof
hydraulics will start to lose pres-
sure.
Make sure the retractable hardtop is com-
pletely opened or closed (
page 199).
locked
in driving mode
You have attempted to open the re-
tractable hardtop while driving.
Stop the vehicle in a safe location and try to
open the hardtop again.
O
You are driving with the hood open.
Risk of accident!
Stop the vehicle in a safe location or as soon
as it is safe to do so.
Close the hood (
page 275).
Page 379 of 473
378 Practical hintsWhat to do if …Left display
Right display
Possible cause/consequence
Possible solution
I
Remove
key
You have forgotten to remove the
SmartKey from the starter switch.
Remove the SmartKey from the starter
switch.
Replace
key
The SmartKey is no longer function-
al.
Contact an authorized Mercedes-Benz
Center.
F
Change
key batteries
The batteries in the SmartKey with
KEYLESS-GO* are discharged.
Replace the batteries (
page 395).
Page 380 of 473

379 Practical hints
What to do if …
Left display
Right display
Possible cause/consequence
Possible solution
F
Key
not detected
The SmartKey with KEYLESS-GO* is
not recognized while the engine is
running because:
The SmartKey with
KEYLESS-GO* is not in the vehi-
cle.
There is strong radio-frequency
interference.
Stop the vehicle in a safe location or as soon
as it is safe to do so.
Search for the SmartKey with KEYLESS-GO*.
Otherwise the vehicle cannot be centrally
locked nor can the engine be started again af-
ter the engine is stopped.
Operate the vehicle with the SmartKey with
KEYLESS-GO* in the starter switch
Key
not detected
The SmartKey with KEYLESS-GO* is
not recognized when attempting to
start the engine with the
KEYLESS-GO start/stop button* on
the gear selector lever because:
The SmartKey with
KEYLESS-GO* is not in the vehi-
cle.
The battery in the SmartKey
with KEYLESS-GO* is not insert-
ed properly or completely dis-
charged.
Change the position of the SmartKey with
KEYLESS-GO* in the vehicle.
Make sure the batteries in the SmartKey with
KEYLESS-GO* are properly inserted
(page 395) and are not discharged
(page 110).
Start the engine with the SmartKey with
KEYLESS-GO* in the starter switch if
necessary.
Page 381 of 473

380 Practical hintsWhat to do if …Left display
Right display
Possible cause/consequence
Possible solution
F
Key
still
in vehicle
A SmartKey with KEYLESS-GO* left
in the vehicle was recognized while
locking the vehicle from the out-
side.
Take the SmartKey with KEYLESS-GO* out of
the vehicle.
.
3rd brake lamp
The high mounted brake lamp is
malfunctioning.
Contact an authorized Mercedes-Benz Center
as soon as possible.
AUTO light
inoperative
The light sensor is malfunctioning.
The headlamps switch on automati-
cally.
In the control system, set lamp operation to
manual mode (
page 159).
Switch on headlamps using the exterior lamp
switch.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Brake lamp
left
Auxiliary bulb on
The left brake lamp is malfunction-
ing. An auxiliary bulb has been
brought into use.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Brake lamp
Right
Substitute
bulb on
The right brake lamp is malfunction-
ing. A substitute bulb has been
brought into use.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Front foglamp
left
The left front fog lamp or left cor-
ner-illuminating front fog lamp is
malfunctioning.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Page 382 of 473

381 Practical hints
What to do if …
Left display
Right display
Possible cause/consequence
Possible solution
.
Front foglamp
right
The right front fog lamp or right cor-
ner-illuminating front fog lamp is
malfunctioning.
Contact an authorized Mercedes-Benz Center
as soon as possible.
High beam
left
The left high beam lamp is malfunc-
tioning.
Replace the bulb as soon as possible
(page 397).
High beam
right
The right high beam lamp is mal-
functioning.
Replace the bulb as soon as possible
(page 397).
License plate
lamp – left
The left license plate lamp is mal-
functioning.
Replace the bulb as soon as possible
(page 397).
License plate
lamp – right
The right license plate lamp is mal-
functioning.
Replace the bulb as soon as possible
(page 397).
Low beam
left
The left low beam lamp is malfunc-
tioning.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Low beam
right
The right low beam lamp is malfunc-
tioning.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Marker lamp
front left
The front left side marker lamp is
malfunctioning.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Marker lamp
front right
The front right side marker lamp is
malfunctioning.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Marker lamp
rear left
The rear left side marker lamp is
malfunctioning.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Page 383 of 473

382 Practical hintsWhat to do if …Left display
Right display
Possible cause/consequence
Possible solution
.
Marker lamp
rear right
The rear right side marker lamp is
malfunctioning.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Parking lamp
front left
Auxiliary bulb on
The front left parking or standing
lamp is malfunctioning. An auxiliary
bulb has been brought into use.
Replace the bulb as soon as possible
(page 397).
Parking lamp
front right
Auxiliary bulb on
The front right parking or standing
lamp is malfunctioning. An auxiliary
bulb has been brought into use.
Replace the bulb as soon as possible
(page 397).
Rear foglamp
left
The left rear fog lamp is malfunc-
tioning.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Reverse lamp
left
The left backup lamp is malfunc-
tioning.
Replace the bulb as soon as possible
(page 397).
Reverse lamp
right
The right backup lamp is malfunc-
tioning.
Replace the bulb as soon as possible
(page 397).
Turn signal
left mirror
The turn signal in the driver’s side
exterior rear view mirror is malfunc-
tioning. This message will only ap-
pear if all light emitting diodes have
stopped working.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Page 384 of 473

383 Practical hints
What to do if …
Left display
Right display
Possible cause/consequence
Possible solution
.
Turn signal
right mirror
The turn signal in the passenger
side exterior rear view mirror is mal-
functioning. This message will only
appear if all light emitting diodes
have stopped working.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Tail lamp
left
Auxiliary bulb on
The left tail lamp is malfunctioning.
An auxiliary bulb has been brought
into use.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Tail lamp
right
Auxiliary bulb on
The right tail lamp is malfunction-
ing. An auxiliary bulb has been
brought into use.
Contact an authorized Mercedes-Benz Center
as soon as possible.
Turn off
lights
You have removed the SmartKey
from the starter switch and opened
the driver’s door or removed the
SmartKey with KEYLESS-GO* from
the vehicle and left the headlamps
on.
Turn the exterior lamp switch toM
orU.
Turn signal
front left
Auxiliary bulb on
The left front turn signal lamp is
malfunctioning. An auxiliary bulb
has been brought into use.
Replace the bulb as soon as possible
(page 397).
Turn signal
front right
Auxiliary bulb on
The right front turn signal lamp is
malfunctioning. An auxiliary bulb
has been brought into use.
Replace the bulb as soon as possible
(page 397).