catalytic converter MERCEDES-BENZ C320 2004 W203 Owner's Manual

ContentsOperation......................................... 237
The first 1 000 miles (1 500 km) ......... 238
Driving instructions ............................ 239
Drive sensibly – save fuel ............. 239
Drinking and driving ..................... 239
Pedals .......................................... 239
Power assistance ......................... 239
Brakes .......................................... 240
Driving off..................................... 241
Parking ......................................... 241
Tires ............................................. 242
Hydroplaning ................................ 242
Tire traction .................................. 243
Tire speed rating .......................... 243
Winter driving instructions ........... 244
Standing water ............................. 245
Passenger compartment .............. 246
Driving abroad .............................. 246
Control and operation of radio
transmitters.................................. 246
Catalytic converter ....................... 247
Emission control........................... 247
Coolant temperature .................... 248At the gas station .............................. 249
Refueling ...................................... 249
Check regularly and before
a long trip ..................................... 251
Engine compartment ......................... 252
Hood ............................................ 252
Engine oil ..................................... 253
Transmission fluid level ................ 256
Coolant level ................................ 257
Battery ......................................... 258
Windshield washer system and
headlamp cleaning system* ......... 259
Tires and wheels ................................ 260
Important guidelines .................... 260
Life of tire..................................... 261
Direction of rotation ..................... 261
Checking tire inflation pressure ... 261
Rotating wheels ........................... 262Winter driving .................................... 263
Winter tires .................................. 263
Block heater (Canada only) .......... 264
Snow chains................................. 264
Maintenance...................................... 265
Clearing the service indicator ...... 265
Service term exceeded ................ 265
Calling up the service indicator .... 266
Resetting the service indicator .... 266
Vehicle care....................................... 267
Cleaning and care of the vehicle .. 267

46 Getting startedDrivingAfter a cold start, the automatic transmis-
sion shifts at a higher engine revolution.
This allows the catalytic converter to reach
its operating temperature earlier.
For more information on driving, see “Driv-
ing instructions” (
page 239).
Switching on headlamps
The exterior lamp switch is located on the
dashboard to the left of the steering wheel.Exterior lamp switch1Off
2Low beam headlamps on
Turn switch toB.
For more information on headlamps, see
“Lighting” (
page 102).
Warning!
G
On slippery road surfaces, never downshift
in order to obtain braking action. This could
result in drive wheel slip and reduced vehi-
cle control. Your vehicle’s ABS will not pre-
vent this type of loss of control.!Place the gear selector lever in
positionR only when the vehicle is
stopped in order to avoid damaging the
transmission.!Do not run cold engine at high engine
speeds. Running a cold engine at high
engine speeds may shorten the service
life of the engine.
Warning!
G
Vehicles with automatic transmission:
It is dangerous to shift the gear selector le-
ver out ofP orN if the engine speed is high-
er than idle speed. If your foot is not firmly
on the brake pedal, the vehicle could accel-
erate quickly forward or in reverse. You
could lose control of the vehicle and hit
someone or something. Only shift into gear
when the engine is idling normally and when
your right foot is firmly on the brake pedal.

49 Getting started
Driving
Problems while driving
The engine runs erratically and misfires

An ignition cable may be damaged.


The engine electronics may not be op-
erating properly.


Unburned gasoline may have entered
the catalytic converter and damaged it.

Give very little gas.

Have the problem repaired by an au-
thorized Mercedes-Benz Center as
soon as possible.
The coolant temperature is over 248°F
(120°C)
The coolant is too hot and is no longer
cooling the engine.

Stop the vehicle as soon as possible
and turn off the engine. Allow engine
and coolant to cool.

Check the coolant level and add cool-
ant if necessary (
page 257).In case of accident
If the vehicle is leaking gasoline:

Do not start the engine under any cir-
cumstances.

Notify local fire and/or police authori-
ties.
If the extent of the damage cannot be de-
termined:

Notify an authorized Mercedes-Benz
Center.
If no damage can be determined on the


major assemblies


fuel system


engine mount:

Start the engine in the usual manner.
!If anything blocks the windshield
wipers (leaves, snow, etc.), switch
them off immediately.

For safety reasons, withdraw
SmartKey from starter switch
before attempting to remove any
blockage.


Remove blockage.


Turn the windshield wipers on
again.
If windshield wipers fail to function at
all in switch positionI,


set the combination switch to the
next highest wiper speed


have the windshield wipers
checked at the nearest authorized
Mercedes-Benz Center

142 Controls in detailAutomatic transmission*
Automatic transmission*Automatic transmission is standard
equipment on select models and available
as optional equipment on other models
Information on driving with an automatic
transmission is found in the “Getting
started” section (
page 44).
Your vehicle’s transmission adapts its gear
shifting process to your individual driving
style by continually adjusting the shift
points up or down. These shift point adjust-
ments are performed based on current
operating and driving conditions.
If the operating conditions change, the
automatic transmission reacts by
adjusting its gear shift program.The automatic transmission selects indi-
vidual gears automatically, depending on:


the gear selector lever positionD with
gear ranges4, 3, 2, 1 (
page 144)


the selected shift program (C/S)
(page 146)


the position of the accelerator pedal
(page 147)


the vehicle speed
The current gear selector lever position
and shift program (
C/S) appear in the
multifunction display (page 113).
An additional indication of the current gear
selector lever position can be found on the
cover of the shifting-gate. The indicators
come on when you activate a switch (e.g.
unlocking the vehicle or opening a door)
and go out after approximately
15 minutes.When the gear selector lever is in
positionD, you can influence transmission
shifting by:


limiting the gear range


changing gears manually
iDuring the brief warm-up, transmission
upshifting is delayed. This allows the
catalytic converter to heat up more
quickly to operating temperature.
Warning!
G
It is dangerous to shift the gear selector
lever out ofP orN if the engine speed is
higher than idle speed. If your foot is not
firmly on the brake pedal, the vehicle could
accelerate quickly forward or reverse. You
could lose control of the vehicle and hit
someone or something. Only shift into gear
when the engine is idling normally and when
your right foot is firmly on the brake pedal.

247 Operation
Driving instructions
Catalytic converter
Your Mercedes-Benz is equipped with
monolithic-type catalytic converters, an
important element in conjunction with the
oxygen sensors to achieve substantial
control of the pollutants in the exhaust
emissions. Keep your vehicle in proper
operating condition by following our
recommended maintenance instructions
as outlined in your Service Booklet.
Emission control
Certain systems of the engine serve to
keep the toxic components of the exhaust
gases within permissible limits required by
law.
These systems, of course, will function
properly only when maintained strictly
according to factory specifications. Any
adjustments on the engine should,
therefore, be carried out only by qualified
Mercedes-Benz Center authorized techni-
cians. Engine adjustments should not be
altered in any way. Moreover, the specified
service jobs must be carried out regularly
according to Mercedes-Benz servicing
requirements. For details refer to the
Service Booklet.
!To prevent damage to the catalytic
converters, only use premium unleaded
gasoline in this vehicle.
Any noticeable irregularities in engine
operation should be repaired promptly.
Otherwise, excessive unburned fuel
may reach the catalytic converter,
causing it to overheat and start a fire.
Warning!
G
As with any vehicle, do not idle, park or
operate this vehicle in areas where combus-
tible materials such as grass, hay or leaves
can come into contact with the hot exhaust
system, as these materials could be ignited
and cause a vehicle fire.

255 Operation
Engine compartment
If you see the message:OBSERVE WAITING PERIOD
If engine is at normal operating
temperature, wait five minutes before
repeating check procedure.

If engine is not yet at normal operating
temperature, wait 30 minutes before
repeating check procedure.
If you see the message:
ENGINE OIL LEVEL
NOT WHEN ENGINE ON!
Turn off the engine.

If the engine is at normal operating
temperature, wait five minutes before
checking oil.

If the engine is not yet at normal
operating temperature, you must wait
30 minutes before checking oil.If there is excess engine oil with the engine
at normal operating temperature, the
following message will appear:
ENGINE OIL LEVEL
REDUCE OIL LEVEL
Have excess oil siphoned or drained
off. Contact your authorized
Mercedes-Benz Center.
More information on messages in the
display concerning engine oil can be found
in the “Practical hints” section
(
page 291). Adding engine oil!Excess oil must be siphoned or drained
off. It could cause damage to the
engine and catalytic converter not
covered by the Mercedes-Benz Limited
Warranty.
!Only use approved engine oils. For a
listing of approved engine oils, refer to
the Factory Approved Service Products
pamphlet in your vehicle literature
portfolio.
In addition, check the oil filler cap for
important information pertaining to the
engine oil needing to meet a specific
Mercedes-Benz specification
(e.g. MB 229.5). If such information is
printed on the oil filler cap, only use an
engine oil from the list of approved
engine oils in the Factory Approved
Service Products pamphlet that meets
the specification indicated on the oil
filler cap. Using engine oils of other
specification may cause the FSS to
incorrectly determine the next service
interval and will result in engine dam-
age not covered by the Mercedes-Benz
Limited Warranty.

256 OperationEngine compartmentC 230 Kompressor Sport1Filler cap
Unscrew filler cap1 from filler neck.

Add engine oil as required. Be careful
not to overfill with oil.
Be careful not to spill any oil when adding.
Avoid environmental damage caused by oil
entering the ground or water.

Screw filler cap1 back on filler neck.
C 240 , and C 320 (all models), C 32 AMG1Filler cap
Unscrew filler cap1 from filler neck.

Add engine oil as required. Be careful
not to overfill with oil.Be careful not to spill any oil when adding.
Avoid environmental damage caused by oil
entering the ground or water.

Screw filler cap1 back on filler neck.
More information on engine oil can be
found in the “Technical data” section
(
page 349) and (
page 352).
Transmission fluid level
The transmission fluid level does not need
to be checked. If you notice transmission
fluid loss or gear shifting malfunctions,
have an authorized Mercedes-Benz Center
check the transmission.
!Excess oil must be siphoned or drained
off. It could cause damage to the
engine and catalytic converter not
covered by the Mercedes-Benz Limited
Warranty.
!Excess oil must be siphoned or drained
off. It could cause damage to the
engine and catalytic converter not
covered by the Mercedes-Benz Limited
Warranty.

291 Practical hints
What to do if …
Display symbol
Display messages
Possible cause
Suggested solution
:
USA only:ADD 1.0 Qt. ENGINE OIL
WHEN NEXT REFUELING!Canada only:ADD 1.0 LITER ENG. OIL
WHEN NEXT REFUELING!
The engine oil level is too low.

Add engine oil (
page 255) and check
the engine oil level (
page 254).
ENGINE OIL LEVEL
STOP, ENGINE OFF!
There is no oil in the engine. There is a
danger of engine damage.

Carefully bring the vehicle to a halt as
soon as possible.

Turn off the engine.

Add engine oil (
page 255) and check
the engine oil level (
page 254).
ENGINE OIL LEVEL
REDUCE OIL LEVEL
You have added too much engine oil.
There is a risk of damaging the engine or
the catalytic converter.

Have oil siphoned or drained off.
Observe all legal requirements with
respect to its disposal.
ENGINE OIL
VISIT WORKSHOP!
It may be that there is water in the engine
oil.

Have the engine oil checked.

326 Practical hintsJump starting
Jump starting
If the battery is discharged, the engine can
be started with jumper cables and the
battery of another vehicle. Observe the
following:

Jump starting should only be performed
when the engine and catalytic con-
verter are cold.


Do not start the engine if the battery is
frozen. Let the battery thaw out first.


Only jump start from batteries with the
same voltage rating (12 V). Jump
starting with a more powerful battery
could damage the vehicle’s electrical
system, which will not be covered by
the Mercedes-Benz Limited Warranty.


Only use jumper cables with sufficient
cross-section and insulated terminal
clamps.


Always make sure the jumper cables
are not on or near pulleys, fans, or oth-
er parts that move when an engine is
started or running.
Warning!
G
Failure to follow these directions will cause
damage to the electronic components, and
can lead to a battery explosion and severe
injury or death.
Never lean over batteries while connecting
or jump starting, you might get injured.
Battery fluid contains sulfuric acid. Do not
allow this fluid to come in contact with eyes,
skin or clothing. In case it does, immediately
flush affected area with water, and seek
medical help if necessary.
A battery will also produce hydrogen gas,
which is flammable and very explosive. Keep
flames or sparks away from battery, avoid
improper connection of jumper cables,
smoking, etc.
Attempting to jump start a frozen battery
can result in it exploding, causing personal
injury.
Read all instructions before proceeding.
!Jump starting may only be performed
on the battery installed in the engine
compartment.
Avoid repeated and lengthy starting
attempts.
Do not attempt to start the engine
using a battery quick charge unit.
If engine does not run after several
unsuccessful starting attempts, have it
checked at the nearest authorized
Mercedes-Benz Center.
Excessive unburned fuel generated by
repeated failed starting attempts may
damage the catalytic converter and
may present a fire risk.
Make sure the jumper cables do not
have loose or missing insulation.
Make sure the cable clamps do not
touch any other metal part while the
other end is still attached to a battery.

371 Index
Bi-Xenon headlamps* 361
Bi-Xenon type*
Front lamp bulbs 313
Block heater 264
Blocking
Rear door window operation 70
Bolts
For Minispare wheel 304
Brake Assist System see BAS
Brake fluid 352
Checking 251
Message in display 286
Brake lamp bulbs 311
Brake lamp, high mounted 311
Brake pads
Message in display 286
Brakes 240
Warning lamp 275
Break-in period 238Bulbs, replacing 310
Additional turn signals 310
Backup lamps 311
Brake lamps 311
Fog lamps 310
Front lamps 310
High beam 310
High beam flasher 310
High mounted brake lamp 311
License plate lamps 311, 315
Low beam 310
Parking lamps 310, 311, 313, 314
Rear fog lamp 311, 315
Rear lamps 311
Side marker lamps 310, 314
Standing lamps 310, 311, 313, 314
Tail lamp assemblies 311, 315
Turn signal lamps 310, 311
Button
Audio system 176C
CAC 361
California
Important notice 11
Calling up
Range (distance to empty) 138
Service indicator 266
CAN system 361
Capacities
Fuels, coolants, lubricants, etc. 349
Cargo area see Trunk
Cassette operation
Playing cassettes 186
Cassette player
Operating 121
Catalytic converter 247
CD changer* 189
CD player*
Operating 120
CD* operation 189