2008 MERCEDES-BENZ C300 4MATIC Owner's Manual

408 Practical hints
What to do if …?
Display Possible cause/consequencePossible solution
IReplace
Key BatteryThe batteries in the SmartKey with
KEYLESS-GO* are discharged.Replace the batteries (page 428).
Key Detected
In VehicleA SmartKey with KEYLESS-GO* (Canada
only) left in the vehicle was recognized
while locking the vehicle from the outside.Take the SmartKey with KEYLESS-GO* out of
the vehicle.
Obtain
A New KeyThe SmartKey with KEYLESS-GO* (Canada
only) must be replaced.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Remove "Start"
Button
And Insert KeyThe KEYLESS-GO* system (Canada only) is
malfunctioning.Remove KEYLESS-GO* button (Canada only)
from the starter switch (
page 83).
Operate the vehicle with the SmartKey in the
starter switch.
IClose Doors
To Lock VehicleYou wanted to lock the vehicle but not all
doors were closed.Close doors and lock vehicle again.
Key Does Not
Belong to VehicleYou have insert an incorrect key in the start-
er switch.Remove key and insert the correct key.
Don’t Forget
Your KeyThis display appears (for a maximum of
60 seconds) if the driver’s door is opened
with the engine turned off and no SmartKey
in the starter switch.
This message is only a reminder.Take the SmartKey or SmartKey with
KEYLESS-GO* (Canada only) with you when
leaving the vehicle.

409 Practical hints
What to do if …?
ITake Your Key
From IgnitionYou have forgotten to remove the
SmartKey.Remove the SmartKey from the starter
switch.
.AUTO Lamp Function
InoperativeThe light sensor is malfunctioning. Daytime
driving lamps are switched on.In the instrument cluster control system, set
lamp operation to manual mode.
Switch on headlamps using the exterior lamp
switch.
Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Center Brake LampThe high mounted brake lamp is malfunc-
tioning. This message will only appear if all
light emitting diodes have stopped working.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Left Brake LampThe left brake lamp is malfunctioning.Replace the bulb as soon as possible
(
page 436).
Check
Right Brake LampThe right brake lamp is malfunctioning.Replace the bulb as soon as possible
(
page 436).
Display Possible cause/consequencePossible solution

410 Practical hints
What to do if …?
Display Possible cause/consequencePossible solution
.Check Left
Cornering LightThe left-hand corner-illuminating lamp is
malfunctioning.Contact an authorized Mercedes-Benz
Center as soon as possible.
Check Right
Cornering LightThe right-hand corner-illuminating lamp is
malfunctioning.Contact an authorized Mercedes-Benz
Center as soon as possible.
Check
Left Fog LampThe left front fog lamp is malfunctioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Right Fog LampThe right front fog lamp is malfunctioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Rear Left
Fog LampThe left rear fog lamp is malfunctioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Left High BeamThe left high beam lamp is malfunctioning.Replace the bulb as soon as possible
(
page 433).
Check
Right High BeamThe right high beam lamp is malfunctioning.Replace the bulb as soon as possible
(
page 433).

411 Practical hints
What to do if …?
Display Possible cause/consequencePossible solution
.Check Left
License Plate LampThe left license plate lamp is malfunction-
ing.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check Right
License Plate LampThe right license plate lamp is malfunction-
ing.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Left Low BeamThe left low beam lamp is malfunctioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Right Low BeamThe right low beam lamp is malfunctioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Front Left
Parking LampThe left front parking lamp is malfunction-
ing.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Front Right
Parking LampThe right front parking lamp is malfunction-
ing.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Left Reverse LampThe left reverse lamp is malfunctioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Right Reverse LampThe right reverse lamp is malfunctioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.

412 Practical hints
What to do if …?
Display Possible cause/consequencePossible solution
.Check
Front Left
Side Marker LampThe front left side marker lamp is malfunc-
tioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Front Right
Side Marker LampThe front right side marker lamp is malfunc-
tioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Rear Left
Side Marker LampThe rear left side marker lamp is malfunc-
tioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Rear Right
Side Marker LampThe rear right side marker lamp is malfunc-
tioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check Left
Tail and Brake
LampsThe left tail lamp/brake lamp is malfunc-
tioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check Right
Tail and Brake
LampsThe right tail lamp/brake lamp is malfunc-
tioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.

413 Practical hints
What to do if …?
Display Possible cause/consequencePossible solution
.Check Left
Tail LampThe left tail lamp is malfunctioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check Right
Tail LampThe right tail lamp is malfunctioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Front Left
Turn SignalThe left front turn signal lamp is malfunc-
tioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Front Right
Turn SignalThe right front turn signal lamp is malfunc-
tioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Rear Left
Turn SignalThe left rear turn signal lamp is malfunction-
ing.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.
Check
Rear Right
Turn SignalThe right rear turn signal lamp is malfunc-
tioning.Contact an authorized Mercedes-Benz Cen-
ter as soon as possible.

414 Practical hints
What to do if …?
Display Possible cause/consequencePossible solution
.Check
Left Mirror
Turn SignalThe turn signal in the left exterior rear view
mirror is malfunctioning. This message will
only appear if all light emitting diodes have
stopped working.Have the LEDs replaced as soon as possible.
Check
Right Mirror
Turn SignalThe turn signal in the right exterior rear view
mirror is malfunctioning. This message will
only appear if all light emitting diodes have
stopped working.Have the LEDs replaced as soon as possible.
Switch Off LightsYou are getting out of the vehicle and the
lights are still switched on.Switch off the headlamps (page 108).
Turn Lights Off
Or
Remove KeyThe exterior lamp switch is set to * and
you have forgotten to take out the
SmartKey. The parking lamps remain
switched on.Switch off the headlamps (page 108).
or
Remove the SmartKey from the starter
switch.

415 Practical hints
What to do if …?
When the message Check Engine Oil At
Next Refueling
appears while the engine
is running and at operating temperature,
the engine oil level has dropped to approx-
imately 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, 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 Facto-
ry Approved Service Products pamphlet.
For information on approved engine oils,
refer to the Factory Approved Service
Products pamphlet (USA only) or contact
an authorized Mercedes-Benz Center.
Display Possible cause/consequencePossible solution
ùCheck
Engine Oil
At Next RefuelingThe engine oil level has dropped to approx-
imately the minimum level.Check the engine oil level (page 327) and
add engine oil as required (
page 328).
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.