
Display messagesPossible causes/consequences and M SolutionsFront
Passenger
Airbag
Disabled
See
Operator’s
ManualUSA only:
The front passenger front air bag is deactivated while driving
even though an adult or someone larger than a small
individual is occupying the front passenger seat. Forces
acting on the seat may make the system sense a decrease in
weight.XStop the vehicle in a safe location as soon as possible.XEngage the parking brake.XSwitch off the ignition.XHave the front passenger vacate the seat and exit the
vehicle.XKeep the seat unoccupied, close the front passenger door
and switch on the ignition.
Monitor the 45 indicator lamp in the center console
( Y page 45) and the multifunction display in the instrument
cluster ( Y page 28) for the following:
With the seat unoccupied and the ignition switched on,
R the 45 indicator lamp in the center console should
illuminate and remain illuminated, indicating that the OCS
( Y page 42) has deactivated the front passenger front air
bag.
R the message Front Passenger Airbag Enabled See
Operator’s Manual or the message Front Passenger
Airbag Disabled See Operator’s Manual should not
appear in the multifunction display at any time the seat is
unoccupied. Wait at least 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. Depending on the front passenger
classification sensed by the OCS, the 45 indicator
lamp will remain illuminated or go out.
If above conditions are not met, the system is not working
properly. Have the system checked at an authorized
Mercedes-Benz Center as soon as possible.
274Vehicle status messages in the multifunction displayPractical hints
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ProblemPossible causes/consequences and M SolutionsCanada only:
45
The front passenger
front air bag off
indicator lamp does not
illuminate or does not
remain illuminated with
a BabySmart TM
child
seat properly installed
on the passenger seat.The system is malfunctioning.XMake sure there is nothing between seat cushion and child seat.XCheck installation of the child seat ( Y page 57).
If the front passenger front air bag off indicator lamp remains out:
XHave the system checked as soon as possible at an authorized
Mercedes-Benz Center.
Do not use the BabySmart TM
restraint to transport children on the
front passenger seat until the system has been repaired.
USA only:
45
The front passenger
front air bag off
indicator lamp
illuminates and
remains illuminated
with the weight of a
typical adult or
someone larger than a
small individual on the
front passenger seat.The system is malfunctioning.XHave the system checked as soon as possible at an authorized
Mercedes-Benz Center.XRead and observe messages in the multifunction display and
follow corrective steps ( Y page 270).GWarning!
If the 45 indicator lamp illuminates
and remains illuminated with the weight of a
typical adult or someone larger than a small
individual on the front passenger seat, do not
have any passenger use the front passenger
seat until the system has been repaired.ProblemPossible causes/consequences and M SolutionsUSA only:
45
The front passenger
front air bag off
indicator lamp does not
illuminate and/or does
not remain illuminated
with the weight of a
typical 12-month-old
child in a standard child
restraint or less on the
front passenger seat.The system is malfunctioning.XMake sure there is nothing between seat cushion and child seat
and check installation of the child seat.XMake sure no objects applying supplemental weight onto the
seat are present.XIf the front passenger front air bag off indicator lamp remains
out, have the system checked as soon as possible at an
authorized Mercedes-Benz Center. Do not transport a child on
the front passenger seat until the system has been repaired.XRead and observe messages in the multifunction display and
follow corrective steps ( Y page 270).308What to do if …Practical hints
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GWarning!
If the 45 indicator lamp does not
illuminate or remains out with the weight of a
typical 12-month-old child in a standard child
restraint or less on the front passenger seat,
do not transport a child on the front
passenger seat until the system has been
repaired.
Unlocking/locking manually
Unlocking the vehicle
If you cannot unlock the vehicle with the
SmartKey or with KEYLESS-GO, unlock the
driver’s door and the trunk using the
mechanical key.
The anti-theft alarm system will trigger when
you
Runlock the driver’s door or the trunk with
the mechanical key
and
Ropen the driver’s door or the trunk
To cancel the alarm, insert the SmartKey into
the starter switch.
Removing the mechanical key
XMove locking tab : in the direction of
arrow.
XSlide mechanical key ; out of the housing.Unlocking the driver’s doorXInsert mechanical key ; into the driver’s
door lock.
XTurn mechanical key ; counterclockwise
to position 1.
XPull the door handle to open the driver’s
door.
XTurn mechanical key ; back and remove
it from the driver’s door lock.
Unlocking the trunk
A minimum height clearance of 5.9 ft (1.8 m)
is required to open the trunk lid.
XInsert mechanical key ; into the trunk lid
lock.
XTurn mechanical key ; counterclockwise
to position 1.
! When you open the trunk, the trunk lid
swings open upwards. Always make sure
there is sufficient overhead clearance.
Unlocking/locking manually309Practical hints204_AKB; 5; 23, en-USd2ureepe,Version: 2.11.8.12009-07-16T17:54:06+02:00 - Seite 309Z

Lowering the vehicleXLower the vehicle by turning the crank
counterclockwise until the vehicle is
resting fully on its own weight.
XRemove the jack.XTighten the five wheel bolts evenly,
following the diagonal sequence illustrated
(: to A), until all bolts are tight. Observe
a tightening torque of 96 lb-ft (130 Nm).
GWarning!
Have the tightening torque checked after
changing a wheel. The wheels could come
loose if they are not tightened to a torque of
96 lb-ft (130 Nm).
XFully collapse the jack, with handle folded
in (storage position), see (Y page 269).
XStore the jack and the other vehicle tools
in the designated storage space.
For information on storing the spare wheel
after it has been replaced by a regular road
wheel, see (Y page 270).
iVehicles with TPMS:
Do not restart the tire inflation pressure
monitor until a full size wheel/tire with
functioning sensor has been placed back
into service on the vehicle.
Battery
Safety notes
A battery should always be sufficiently
charged in order to achieve its rated service
life. Refer to Maintenance Booklet for battery
maintenance intervals.
If you use your vehicle mostly for short-
distance trips, you will need to have the
battery charge checked more frequently.
When replacing a battery, always use a
battery approved by Mercedes-Benz.
If you do not intend to operate your vehicle
for an extended period of time, contact an
authorized Mercedes-Benz Center about
steps you need to observe.
GWarning!
Observe all safety instructions and
precautions when handling automotive
batteries.
Risk of explosion.Fire, open flames and
smoking are prohibited
when handling batteries.
Avoid creating sparks.
Battery acid is caustic. Do
not allow it to come into
contact with skin, eyes or
clothing.
Wear suitable protective
clothing, especially gloves,
apron and faceguard.
Wear eye protection.
Rinse any acid spills
immediately with clear
water. Contact a physician
if necessary.
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Vehicle specification C 250 (204.052)
The quoted data apply only to the standard
vehicle. Contact an authorized Mercedes-
Benz Center for the corresponding data of all
special bodies and special equipment.
i The C 250 is available in Canada only.Engine C 250Engine, type272Mode of operation4-stroke engine,
gasoline injectionNo. of cylinders6Bore3.46 in (88.00 mm)Stroke2.69 in (68.40 mm)Total piston
displacement152.3 cu in
(2 496 cm 3
)Compression
ratio11.4:1Output acc. to
SAE J 1349 21201 hp/6
100 rpm
(150 kW/6 100 rpm)Maximum torque
acc. to SAE J 1349181 lb-ft/
2 900 - 5 500 rpm
(245 Nm/
2 900 - 5 500 rpm)Maximum engine
speed6 500 rpmFiring order1-4-3-6-2-5Poly-V-belt2 401 mmElectrical system C 250Alternator14 V/150 AStarter motor12 V/1.4 kWBattery12 V/74 AhElectrical system C 250Spark plugs, typeBosch Y 7 MPP33Spark plugs,
electrode gap0.031 in (0.8 mm)Spark plugs,
tightening torque15 - 18 lb-ft
(20 - 25 Nm)Main dimensions C 250Overall vehicle
length182.3 in (4 630 mm)Overall vehicle
width 2279.5 in (2
020 mm)Overall vehicle
height56.9 in (1 444 mm)Wheelbase108.7 in (2 760 mm)Track, front60.7 in (1 541 mm)Track, rear60.8 in (1 544 mm)Turning circle35.4 ft (10.8 m)Weights C 250Roof loadmax. 220 lb (100 kg)Trunk loadmax. 220 lb (100 kg)
Vehicle specification C 250 Sport
(204.052)
The quoted data apply only to the standard
vehicle. Contact an authorized Mercedes-
Benz Center for the corresponding data of all
special bodies and special equipment.
i The C 250 Sport is available in Canada
only.
21 Premium fuel required. Performance may vary with fuel octane rating.
22 Exterior rear view mirrors folded out.334Vehicle specification C 250 Sport (204.052)Technical data
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Engine C 250 SportEngine, type272Mode of operation4-stroke engine,
gasoline injectionNo. of cylinders6Bore3.46 in (88.00 mm)Stroke2.69 in (68.40 mm)Total piston
displacement152.3 cu in
(2 496 cm 3
)Compression
ratio11.4:1Output acc. to
SAE J 1349 23201 hp/6
100 rpm
(150 kW/6 100 rpm)Maximum torque
acc. to SAE J 1349181 lb-ft/
2 900 - 5 500 rpm
(245 Nm/
2 900 - 5 500 rpm)Maximum engine
speed6 500 rpmFiring order1-4-3-6-2-5Poly-V-belt2 401 mmElectrical system C 250 SportAlternator14 V/150 AStarter motor12 V/1.4 kWBattery12 V/74 AhSpark plugs, typeBosch Y 7 MPP33Spark plugs,
electrode gap0.031 in (0.8 mm)Spark plugs,
tightening torque15 - 18 lb-ft
(20 - 25 Nm)Main dimensions C 250 SportOverall vehicle
length182.8 in (4 630 mm)Overall vehicle
width 2479.5 in (2
020 mm)Overall vehicle
height57.0 in (1 449 mm)Wheelbase108.7 in (2 760 mm)Track, front60.4 in (1 533 mm)Track, rear59.6 in (1 514 mm)Turning circle35.4 ft (10.8 m)Weights C 250 SportRoof loadmax. 220 lb (100 kg)Trunk loadmax. 220 lb (100 kg)
Vehicle specification C 250 4MATIC
(204.085)
The quoted data apply only to the standard
vehicle. Contact an authorized Mercedes-
Benz Center for the corresponding data of all
special bodies and special equipment.
i The C 250 4MATIC is available in Canada
only.
Engine C 250 4MATICEngine, type272Mode of operation4-stroke engine,
gasoline injectionNo. of cylinders6Bore3.46 in (88.00 mm)Stroke2.69 in (68.40 mm)23 Premium fuel required. Performance may vary with fuel octane rating.
24 Exterior rear view mirrors folded out.Vehicle specification C 250 4MATIC (204.085)335Technical data204_AKB; 5; 23, en-USd2ureepe,Version: 2.11.8.12009-07-16T17:54:06+02:00 - Seite 335Z

Engine C 250 4MATICTotal piston
displacement152.3 cu in
(2 496 cm 3
)Compression
ratio11.4:1Output acc. to
SAE J 1349 25201 hp/6
100 rpm
(150 kW/6 100 rpm)Maximum torque
acc. to SAE J 1349181 lb-ft/
2 900 - 5 500 rpm
(245 Nm/
2 900 - 5 500 rpm)Maximum engine
speed6 500 rpmFiring order1-4-3-6-2-5Poly-V-belt2 401 mmElectrical system C 250 4MATICAlternator14 V/150 AStarter motor12 V/1.4 kWBattery12 V/74 AhSpark plugs, typeBosch Y 7 MPP33Spark plugs,
electrode gap0.031 in (0.8 mm)Spark plugs,
tightening torque15 - 18 lb-ft
(20 - 25 Nm)Main dimensions C 250 4MATICOverall vehicle
length182.8 in (4 630 mm)Overall vehicle
width 2679.5 in (2
020 mm)Overall vehicle
height56.9 in (1 445 mm)Main dimensions C 250 4MATICWheelbase108.7 in (2 760 mm)Track, front60.7 in (1 541 mm)Track, rear60.8 in (1 544 mm)Turning circle35.4 ft (10.8 m)Weights C 250 4MATICRoof loadmax. 220 lb (100 kg)Trunk loadmax. 220 lb (100 kg)
Vehicle specification C 250 4MATIC
Sport (204.085)
The quoted data apply only to the standard
vehicle. Contact an authorized Mercedes-
Benz Center for the corresponding data of all
special bodies and special equipment.
i The C 250 4MATIC Sport is available in
Canada only.
Engine C 250 4MATIC SportEngine, type272Mode of operation4-stroke engine,
gasoline injectionNo. of cylinders6Bore3.46 in (88.00 mm)Stroke2.69 in (68.40 mm)Total piston
displacement152.3 cu in
(2 496 cm 3
)Compression
ratio11.4:1Output acc. to
SAE J 1349 27201 hp/6
100 rpm
(150 kW/6 100 rpm)25
Premium fuel required. Performance may vary with fuel octane rating.
26 Exterior rear view mirrors folded out.
27 Premium fuel required. Performance may vary with fuel octane rating.336Vehicle specification C 250 4MATIC Sport (204.085)Technical data
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Engine C 250 4MATIC SportMaximum torque
acc. to SAE J 1349181 lb-ft/
2 900 - 5 500 rpm
(245 Nm/
2 900 - 5 500 rpm)Maximum engine
speed6 500 rpmFiring order1-4-3-6-2-5Poly-V-belt2 401 mmElectrical system C 250 4MATIC SportAlternator14 V/150 AStarter motor12 V/1.4 kWBattery12 V/74 AhSpark plugs, typeBosch Y 7 MPP33Spark plugs,
electrode gap0.031 in (0.8 mm)Spark plugs,
tightening torque15 - 18 lb-ft
(20 - 25 Nm)Main dimensions C 250 4MATIC SportOverall vehicle
length182.8 in (4 630 mm)Overall vehicle
width 2879.5 in (2
020 mm)Overall vehicle
height57.0 in (1 449 mm)Wheelbase108.7 in (2 760 mm)Track, front60.4 in (1 533 mm)Track, rear59.6 in (1 514 mm)Turning circle35.4 ft (10.8 m)Weights C 250 4MATIC SportRoof loadmax. 220 lb (100 kg)Trunk loadmax. 220 lb (100 kg)
Vehicle specification C 300 (204.054)
The quoted data apply only to the standard
vehicle. Contact an authorized Mercedes-
Benz Center for the corresponding data of all
special bodies and special equipment.
Engine C 300Engine, type272Mode of operation4-stroke engine,
gasoline injectionNo. of cylinders6Bore3.46 in (88.00 mm)Stroke3.23 in (82.10 mm)Total piston
displacement182.8 cu in
(2 996 cm 3
)Compression
ratio11.3:1Output acc. to
SAE J 1349 29228 hp/6
000 rpm
(170 kW/6 000 rpm)Maximum torque
acc. to SAE J 1349221 lb-ft/
2 500 - 5 000 rpm
(300 Nm/
2 500 - 5 000 rpm)Maximum engine
speed6 500 rpmFiring order1-4-3-6-2-5Poly-V-belt2 401 mm28
Exterior rear view mirrors folded out.
29 Premium fuel required. Performance may vary with fuel octane rating.Vehicle specification C 300 (204.054)337Technical data204_AKB; 5; 23, en-USd2ureepe,Version: 2.11.8.12009-07-16T17:54:06+02:00 - Seite 337Z