2003 MERCEDES-BENZ CLK320 CABRIOLET catalytic converter

2 ContentsMultifunction steering wheel,
multifunction display ................. 84
Trip and main odometer and sub
menu ............................................. 88
Audio systems .................................. 89
Radio .............................................. 89
CD player ....................................... 90
Cassette player ............................. 91
Telephone .......................................... 92
Telephone book ............................ 92
Redialing ....................................... 94
Incoming call ................................ 96
Navigation system ............................ 97
Trip computer ................................... 98
Malfunction/warning message
memory ...................................... 100
Individual settings ......................... 102
Setting the audio volume .............. 104
Flexible service system (FSS) ...... 105
Engine oil level indicator .............. 108
Engine oil consumption ................ 109
Exterior lamp switch ......................110
Night security illumination ..........111
Headlamp cleaning system .......... 112Combination switch ....................... 113
Hazard warning flasher switch .... 115
Automatic climate control ............. 116
Display and controls .................. 118
Basic setting ................................ 118
Economy ....................................... 119
Special settings ........................... 119
Rear window defroster .............. 120
Air recirculation .........................121
Residual engine heat
utilization .....................................121
Dust filter .................................... 122
Audio and telephone, operation .. 123
Power windows .............................. 142
Interior lighting ............................. 145
Sun visors ....................................... 146
Illuminated vanity mirrors .......... 146
Interior ............................................ 147
Storage compartments, armrest and
cup holder .................................. 147
Glove box ..................................... 147
Ashtray .............................................150
Lighter .............................................. 151
Cargo tie down rings .....................152Parcel net in front passenger
footwell ....................................... 152
Armrest, rear bench ...................... 152
Telephone, general ........................ 153
Cellular telephone ......................... 153
Garage door opener ....................... 154
Soft top ............................................ 158
Wind screen .................................... 166
Roller blind (horizontal) ............... 170
Roller blind (vertical) .................... 171
DrivingControl and operation of radio
transmitters ............................... 174
The first 1 000 miles
(1 500 km) ................................. 175
Maintenance ................................... 175
Catalytic converter ........................ 176
Emission control ............................ 177
Tele Aid ........................................... 178
Steering lock ................................... 188
Starting and turning off the
engine ......................................... 190
Automatic transmission ............... 191

10 Introduction
Operating your vehicle outside the USA or Canada
If you plan to operate your vehicle in foreign countries, please be aware that:
•Service facilities or replacement parts may not be readily available,
•unleaded gasoline for vehicles with catalytic converters may not be available; the use of leaded fuels will damage
the catalysts,
•gasoline may have a considerably lower octane rating, and improper fuel can cause engine damage.
Certain Mercedes-Benz models are available for delivery in Europe under our European Delivery Program. For details,
consult your authorized Mercedes-Benz Center or write to:
In the USA: In Canada:
Mercedes-Benz USA, LLC
European Delivery Department
One Mercedes Drive
Montvale, NJ 07645-0350Mercedes-Benz Canada, Inc.
European Delivery Department
849 Eglinton Avenue East
Toronto, Ontario M4G 2L5

109 Engine oil level indicator
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index One of the following messages will subsequently appear
on the indicator:
“ENGINE OIL LEVEL – O.K.”
No oil needs to be added.
“ENGINE OIL LEVEL – ADD 1.0 QUART”
(Canada: 1.0 L)
“ENGINE OIL LEVEL – ADD 1.5 QUART”
(Canada: 1.5 L)
“ENGINE OIL LEVEL – ADD 2.0 QUART”
(Canada: 2.0 L)
See page 252 for instructions on adding engine oil.
“ENGINE OIL LEVEL – REDUCE OIL LEVEL”
Do not overfill the engine.
Excessive 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.
The message “MEASURING NOT POSSIBLE” will be
displayed if a proper oil level check cannot be
performed. The engine oil level check can be repeated
after a short time.Perform the engine oil level check with the dipstick, if it
cannot be completed via the multifunction display.
Seepage252.
In this case we recommend that you have the system
checked at a Mercedes-Benz Center.
Note:
See malfunction and warning messages on page 230
and page 240 if an engine oil level indicator appears on
the multifunction display when the engine is running.
The engine oil level cannot be checked while the engine
is running. The “ENGINE OIL LEVEL – NOT WHEN
ENGINE ON” message will appear.
Engine oil consumption
Engine oil consumption checks should only be made
after the break-in period. During the break-in period,
higher oil consumption may be noticed and is normal.
Frequent driving at high engine speeds results in
increased consumption.

173
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
DrivingControl and operation of radio
transmitters ............................... 174
The first 1 000 miles
(1 500 km) ................................. 175
Maintenance ................................... 175
Catalytic converter ........................ 176
Emission control ............................ 177
Tele Aid ........................................... 178
Steering lock ................................... 188
Starting and turning off the
engine ......................................... 190Automatic transmission ................ 191
Parking brake ................................ 200
Driving instructions ...................... 201
Drive sensibly – save fuel ........ 201
Drinking and driving ................ 201
Pedals .......................................... 201
Power assistance ........................ 202
Brakes .......................................... 202
Driving off ................................... 203
Parking ........................................ 204
Tires ............................................. 204
Snow chains ............................... 207
Winter driving instructions ..... 207
Standing water ........................... 209
Passenger compartment ........... 209
Traveling abroad ........................ 209Cruise control ................................. 210
Brake assist system (BAS) ............ 212
Antilock brake system (ABS) ....... 214
Electronic stability program
(ESP) ........................................... 216
What you should know at the gas
station .........................................220
Check regularly and before a long
trip ...............................................222

176 Catalytic converter
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
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.Caution!
To prevent damage to the catalytic converters, use only
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, which could start a fire.
Wa r n i n g !
As with any vehicle, do not idle, park or operate
this vehicle in areas where combustible 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.

196 Automatic transmission
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Press and hold selector lever in the æ direction:
The transmission will shift from the current gear
directly to gear range “D”.
Important!
With transmission in gear range “D”, “4” or “3”,
upshifting from 1st to 2nd to 3rd gear is delayed
depending on vehicle speed and engine temperature.
This allows the catalytic converter to heat up more
quickly to operating temperatures.During the brief warm-up period this delayed upshift
and increased engine noise might be perceived as a
malfunction. However, neither the engine nor
transmission are negatively affected by this mode of
operation.
The delayed upshift is effective with vehicle speeds
below 31 mph (50 km/h) at partial throttle and engine
temperatures below 95
°F (35
°C).
To avoid overrevving the engine when the selector lever
is m ove d to a lower gear range , t he tran smi ss ion will n ot
shift to a lower gear, if the engine's max. speed would be
exceeded. In this case there will be no downshift, even
when the vehicle speed reaches the engine’s RPM limit
of that gear, e.g. by applying the service brakes.
To prevent the engine from laboring at low RPM when
driving uphill gradients or with your vehicle heavily
loaded, the automatic transmission will downshift when
necessary to maintain engine RPM within the best
torque range.
Wa r n i n g !
On slippery road surfaces, never downshift in order
to obtain braking action. This could result in drive
wheel slip and reduced vehicle control. Your
vehicle’s ABS will not prevent this type of loss of
control.

240 Malfunction and warning messages
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hints Car care Index
ENGINE OIL LEVEL
1 The engine oil level must be checked immediately. See Engine oil
level indicator on page 108
2 There is no oil in the engine. There is a danger of engine damage.3 There is a risk of damaging the engine or catalytic converter. The
engine oil level must be checked immediately. See Engine oil level
indicator on page 108.
4 The engine oil level has dropped to a critical level.
Check the engine oil level immediately. See Engine oil level
indicator on page 108 and check the engine for visible leakage
(loss of oil).
5 The measuring system is malfunctioning.
6 It may be that there is water in the engine oil. Have the engine oil
checked.
When the “ENGINE OIL LEVEL – CHECK LEVEL”
message appears while the engine is running and at
operating temperature, the engine oil level has dropped
to approximately the minimum mark on the dipstick.
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 “full” mark on the dipstick with an approved oil.
The engine oil level warnings should not be ignored.
Extended driving with the symbol displayed could
result in serious engine damage that is not covered by
the Mercedes-Benz Limited Warranty.
Line 1 Line 2
ENGINE OIL LEVEL CHECK LEVEL!
1
ENGINE OIL LEVEL STOP, ENGINE OFF!
2
ENGINE OIL LEVEL REDUCE OIL LEVEL!
3
ENGINE OIL LEVEL VISIT WORKSHOP!
4
ENGINE OIL SENSOR VISIT WORKSHOP!
5
ENGINE OIL VISIT WORKSHOP!
6

252 Engine compartment
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index
Checking engine oil level (CLK 320 shown)
1Oil dipstick
2Oil filler cap
To check the engine oil level, park vehicle on level
ground, with engine at normal operational temperature.
Check engine oil level approximately 5 minutes after
stopping the engine, allowing for the oil to return to the
oil pan.Wipe oil dipstick clean prior to checking the engine oil
level. Fully insert dipstick in tube, and remove after
three seconds to obtain accurate reading.
Oil level must be between the
lower (min) and upper (max) mark of
the dipstick.
Fill quantity between upper and lower dipstick marking
level is approximately 2.0 US qt (2.0 l).
Do not overfill the engine.
Excessive oil must be drained
or siphoned. It could cause damage to engine and
catalytic converter not covered by the Mercedes-Benz
Limited Warranty.
See malfunction and warning messages on page 230 if
an engine oil level display appears on the multifunction
display when the engine is running.
Note:
See page 108 for engine oil level indicator.
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