2008 MERCEDES-BENZ CL-Class fuel

613 Practical hints
What to do if …?
Problem
Possible cause/consequence
Suggested solution
±
The yellow engine malfunc-
tion indicator lamp comes
on while driving.
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.
Your fuel tank is empty.

After refueling, 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.

619 Practical hints
What to do if …?
Warning!
G
Each tire, including the spare (if provided),
should be checked monthly when cold and
inflated to the inflation pressure recom-
mended by the vehicle manufacturer on the
vehicle placard or the tire inflation pressure
label. (If your vehicle has tires of a different
size than the size indicated on the vehicle
placard or the tire inflation pressure label,
you should determine the proper tire infla-
tion pressure for those tires).
As an added safety feature, your vehicle has
been equipped with a Advanced Tire Pres-
sure Monitoring System (Advanced TPMS)
that illuminates a low tire pressure telltale
when one or more of your tires is significant-
ly under-inflated. Accordingly, when the low
tire pressure telltale illuminates, you should
stop and check your tires as soon as possi-
ble, and inflate them to the proper pressure.
Driving on a significantly under-inflated tire
causes the tire to overheat and can lead to
tire failure.
Under-inflation also reduces fuel efficiency
and tire tread life, and may affect the vehi-
cle’s handling and stopping ability. Please
note that the Advanced TPMS is not a sub-
stitute for proper tire maintenance, and it is
the driver’s responsibility to maintain cor-
rect tire pressure, even if under-inflation has
not reached the level to trigger illumination
of the Advanced TPMS low tire pressure
telltale.
USA only
Your vehicle has also been equipped with a
Advanced TPMS malfunction indicator to in-
dicate when the system is not operating
properly. The Advanced TPMS malfunction
indicator is combined with the low tire pres-
sure telltale. When the system detects a
malfunction, the telltale will flash for approx-
imately 1 minute and then remain continu-
ously illuminated. This sequence will
continue upon subsequent vehicle start-ups
as long as the malfunction exists. When the
malfunction indicator is illuminated, the sys-
tem may not be able to detect or signal low
tire pressure as intended.
Advanced TPMS malfunctions may occur for
a variety of reasons, including the installa-
tion of replacement or alternate tires or
wheels on the vehicle that prevent the Ad-
vanced TPMS from functioning properly. Al-
ways check the Advanced TPMS
malfunction telltale after replacing one or
more tires or wheels on your vehicle to en-
sure that the replacement or alternate tires
and wheels allow the Advanced TPMS to
continue to function properly.

637 Practical hints
What to do if …?
Display
Possible cause/consequence
Possible solution
Tire Pressure Monitor
Currently Unavailable
The Advanced TPMS is unable to monitor
the tire inflation pressure due to:

a nearby radio interference source


the on-board voltage is too low


excessive wheel sensor temperatures
As soon as the causes for the malfunction are no longer present,
the Advanced TPMS automatically becomes active again after a
few minutes driving.
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.
Follow recommended tire inflation pres-
sures.
Do not underinflate tires. Underinflated tires
wear excessively and/or unevenly, adverse-
ly affect handling and fuel economy, and are
more likely to fail from being overheated. Do
not overinflate tires. Overinflated tires can
adversely affect handling and ride comfort,
wear unevenly, increase stopping distance,
and result in sudden deflation (blowout) be-
cause they are more likely to become punc-
tured or damaged by road debris, potholes
etc.

660 Practical hintsWhat to do if …?Display
Possible cause/consequence
Possible solution
Gas Cap Loose
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 (
page 550).
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.
Reserve Fuel
The fuel level has dropped below the re-
serve mark.

Refuel at the next gas station (
page 550).
You are driving with the hood open.

Stop your vehicle as soon as it is safe to do
so.

Engage the electronic parking brake
(page 412).

Close the hood (
page 554).
There is otherwise danger of an accident.

671 Practical hints
What to do if …?
When the message “Check Engine Oil Level
at Next Refueling” (CL 550 and
CL 63 AMG) or “Check Engine Oil Level
(Add 1 quart). (Canada:1Liter)” (CL 600
and CL 65 AMG) 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 is at first in-
termittent and then remains on if the oil
level drops further.
Visually check for oil leaks. If there are no
obvious oil leaks, drive to the nearest ser-
vice station to refill engine oil to the re-
quired level with an approved oil.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/consequence
Possible solution
Check
Engine Oil Level
(Add 1 quart)
(USA only)
Check
Engine Oil Level
(Add 1 Liter)
(Canada only)
CL 600 and CL 65 AMG only:
The engine oil level is too low.

Check the engine oil level (
page 554) and
add engine oil as required (page 557).

If you must add engine oil frequently, have
the engine checked for possible leaks.
Check
Engine Oil Level
at Next Refueling
CL 550 and CL 63 AMG only:
The engine oil level has dropped to approx-
imately the minimum level.

Check the engine oil level (
page 554) and
add engine oil as required (page 557).

If you must add engine oil frequently, have
the engine checked for possible leaks.
!
Engine oil level warnings should not be ig-
nored. Extended driving with the symbol dis-
played could result in serious engine damage
that is not covered by the Mercedes-Benz Limit-
ed Warranty.

676 Practical hintsWhat to do if …?Display
Possible cause/consequence
Possible solution
Caution
Tire Defect
Advanced TPMS:
One or more tires are deflating. The respec-
tive tire is shown in the multifunction
display.

Carefully bring the vehicle to a halt, avoiding
abrupt steering and braking maneuvers.

Engage the electronic parking brake
(page 412).

If necessary, change the wheel (
page 696).
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.
Follow recommended tire inflation pres-
sures.
Do not underinflate tires. Underinflated tires
wear excessively and/or unevenly, adverse-
ly affect handling and fuel economy, and are
more likely to fail from being overheated. Do
not overinflate tires. Overinflated tires can
adversely affect handling and ride comfort,
wear unevenly, increase stopping distance,
and result in sudden deflation (blowout) be-
cause they are more likely to become punc-
tured or damaged by road debris, potholes
etc.

678 Practical hintsWhat to do if …?Display
Possible cause/consequence
Possible solution
Check Tires
Advanced TPMS:
The pressure is too low in one or more tires.
The respective tire is shown in the multi-
function display.

Carefully bring the vehicle to a halt, avoiding
abrupt steering and braking maneuvers.

Engage the electronic parking brake
(page 412).

Check and adjust tire inflation pressure as
required (
page 575).

If necessary, change the wheel (
page 575).
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.
Follow recommended tire inflation pres-
sures.
Do not underinflate tires. Underinflated tires
wear excessively and/or unevenly, adverse-
ly affect handling and fuel economy, and are
more likely to fail from being overheated. Do
not overinflate tires. Overinflated tires can
adversely affect handling and ride comfort,
wear unevenly, increase stopping distance,
and result in sudden deflation (blowout) be-
cause they are more likely to become punc-
tured or damaged by road debris, potholes
etc.

685 Practical hints
Unlocking/locking in an emergency
Unlocking the trunk
A minimum height clearance of 6.0 ft
(1.8 m) is required to open the trunk lid.
Insert the mechanical key2 into the
trunk lid lock until it stops.

Turn mechanical key2 all the way
counterclockwise to position 1.
The trunk opens.

Turn the mechanical key2 back and
remove it from the trunk lid lock.
Locking the vehicle
If you cannot lock the vehicle with the
SmartKey or KEYLESS-GO*, do the
following:
Open the passenger door.

Close the driver’s door and the trunk.

Press down the locking knob of the
driver’s door manually.

Press down the locking knob of the
passenger door.

Exit the vehicle.

Lock the trunk with the mechanical key
(page 505).

Close the passenger door.
The vehicle is locked.
1
Unlocking in an emergency
2
Mechanical key
!
The trunk lid swings open upwards automat-
ically. Always make sure that there is sufficient
overhead clearance.
i
If you cannot close the trunk with the re-
mote trunk opening/closing switch, lower the
trunk lid manually and close it with hands placed
flat on the trunk lid until it is engaged in its lock.
!
To prevent inadvertent lockout, make sure
to have the SmartKey or SmartKey with
KEYLESS-GO* with you before proceeding with
the next step. The next step will lock the vehicle.
i
This procedure does not arm the anti-theft
alarm system nor does it lock the fuel filler flap.