catalytic converter MERCEDES-BENZ B-CLASS HATCHBACK 2008 Owners Manual

Driving and pa
rking 88 Pulling away
! Warm up the engine quickly. Do not use
the engine's full performance until it has
reached operating temperature.
Only shift into reverse gear when the vehi-
cle is stationary.
Where possible, avoid spinning the drive
wheels when pulling away on slippery
roads. Otherwise, you could damage the
drive train.
i The vehicle locks centrally once you have
pulled away. The locking knobs in the doors
drop down.
You can open the doors from the inside at
any time.
You can also deactivate the automatic lock-
ing feature (Y page 110).
Manual transmission X
Depress the brake pedal.
X Depress the clutch pedal.
X Shift to either first or reverse gear.
X Release the parking brake (Y page 89).
X Slowly release the clutch pedal and
depress the accelerator pedal. !
Change gear in good time and avoid spin-
ning the wheels. Otherwise, you could dam-
age the vehicle.
AUTOTRONIC* i
It is only possible to move the selector
lever to the desired position if you depress
the brake pedal. Only then is the selector
lever lock released.
X Depress the brake pedal and keep it
depressed.
The selector lever lock is released.
X Release the parking brake.
X Move the selector lever to position Dor R.
i Wait until the shift process is completed
before pulling away.
X Release the brake pedal.
X Carefully depress the accelerator pedal.
i Upshifts take place at higher engine
speeds after a cold start. This helps the
catalytic converter to reach its operating
temperature more quickly. Hill start assist Hill start assist helps you when pulling away
on uphill gradients. It holds the vehicle for a
short time after you have removed your foot
from the brake pedal. This gives you enough
time to move your foot from the brake pedal
to the accelerator pedal and depress it before
the vehicle begins to roll.
G
Risk of accident
Never leave the vehicle when it is held by
hill start assist. After approximately one
second, hill start assist will no longer brake
your vehicle and it could roll away.
X Remove your foot from the brake pedal.
i Once you have taken your foot off the
brake pedal, the vehicle is held for around
one second.
X Pull away.
Hill start assist does not function if:
R you are pulling away on a level road or a
downhill gradient.
R on vehicles with AUTOTRONIC *,the selec-
tor lever is in the Nposition. Controls
* optional
245_AKB; 2; 7, en-GB
wdomann,
Version: 2.11.4 2008-10-17T11:22:31+02:00 - Seite 88Dateiname: 6515_1640_02_buchblock.pdf; preflight

Engine compartment
173
operating temperature (i.e. if you only star-
ted the engine briefly)
Using the on-board computer*
i Only possible on vehicles with a diesel
engine. A dipstick is used to check petrol
engines (Y page 174).
X Make sure that the key is in position
2(Y page 62) in the ignition lock.
X Press the jork button to select the
following message: The measurement takes a few seconds. You
will see one of the following messages in the
display: R
Engine oil level OK
R Add 1.0 litre to reach maximum oil
level
R Add 1.5 litres to reach maximum oil
level
R Add 2.0 litres to reach maximum oil
level
X Top up the oil if necessary ( Ypage 174).
Other messages in the multi-function dis-
play
If the engine is at normal operating tempera-
ture and there is too much oil, you will see the
following message:
Eng. oil level
Reduce oil level
X Have excess oil siphoned off.
! There is a risk of damage to the engine or
the catalytic converter if there is excess oil
in the engine.
If the Switch ignition on to check
engine oil level message appears:
X Turn the key to position 2(Y page 62) in
the ignition lock.
You will see the following message if you did
not observe the required waiting period: Observe waiting period
X
Repeat the measurement after about five
minutes if the engine is at normal operating
temperature.
X Repeat the measurement after about
30 minutes if the engine is not at normal
operating temperature (if the engine was
only started briefly).
The following message appears if the engine
is running:
Engine oil level Not when engine on
X Switch off the engine and wait for five
minutes if the engine is at normal operating
temperature, or for about 30 minutes if the
engine is not at normal operating temper-
ature (if the engine was only started
briefly), before measuring.
i If you wish to cancel the measurement,
press the korj button on the multi-
function steering wheel. Operation
* optional
245_AKB; 2; 7, en-GB
wdomann,
Version: 2.11.4 2008-10-17T11:22:31+02:00 - Seite 173 ZDateiname: 6515_1640_02_buchblock.pdf; preflight

Engine compartment
174
Using the oil dipstick
Example: vehicles with a petrol engine
1
Oil dipstick
2 Maximum mark
3 Minimum mark Example: vehicles with a turbo/diesel engine
1
Oil dipstick
2 Maximum mark
3 Minimum mark
X Pull oil dipstick 1out of the oil dipstick
tube.
X Wipe off oil dipstick 1.
X Insert oil dipstick 1into the oil dipstick
tube to the stop, and take it out again.
The oil level is correct if the level is between
minimum mark 3and maximum mark
2.
X Top up the oil if necessary. Topping up the engine oil Example: vehicles with a petrol/diesel engine
1
Cap
X Unscrew cap 1and remove it.
X Top up with the required amount of oil
(Y page 295).
i The difference in quantity between the
minimum mark and the maximum mark is
approximately 1.5 litres.
! Do not add too much oil. If too much oil
is added and the oil level is above the max-
imum mark on the dipstick, the engine or
catalytic converter could be damaged.
Have excess oil siphoned off.
X Screw cap 1onto the filler neck. Operation
245_AKB; 2; 7, en-GB
wdomann, Version: 2.11.4
2008-10-17T11:22:31+02:00 - Seite 174 Dateiname: 6515_1640_02_buchblock.pdf; preflight

Display
messages 220 Display messages Possible cause/consequence Possible solution
N Eng. oil level
Check level Vehicles with a petrol engine: the oil level
is too low. X
Check the oil level (Y page 172).
X If necessary, top up the motor oil.
X Have the engine checked for leaks if the engine
oil needs topping up more often than usual. N Eng. oil level Stop
car, turn eng. off Vehicles with a diesel engine: the oil level
is too low. There is a risk of engine dam-
age. X
Stop in accordance with traffic conditions.
X Switch off the engine.
X Top up the engine oil and check the level
(Y page 172). N Engine oil level
Reduce oil level Vehicles with a diesel engine: you have
added too much engine oil. There is a risk
of damage to the engine or to the catalytic
converter. X
Siphon off excess engine oil until it is at the
specified level. Observe the legal require-
ments. N Cannot measure oil
level Vehicles with a diesel engine: the meas-
uring system is faulty. X
Visit a qualified specialist workshop. I Key does not belong
to vehicle You have put the wrong key in the ignition
lock. X
Use the correct key. I Remove key The key is in the ignition lock. X
Remove the key. I Replace key The key needs to be replaced. X
Visit a qualified specialist workshop. Ñ SPEEDTRONIC inop-
erative
Speedtronic* and cruise control* are
faulty. X
Visit a qualified specialist workshop. Practical advi
ce
* optional
245_AKB; 2; 7, en-GB
wdomann,
Version: 2.11.4 2008-10-17T11:22:31+02:00 - Seite 220Dateiname: 6515_1640_02_buchblock.pdf; preflight

Troubleshooting
234 Problem Possible cause/consequence Suggested solutions
Vehicles with a petrol engine:
The engine is not running
smoothly and is misfiring. There is a malfunction in the
engine electronics or a mechani-
cal component of the engine con-
trol unit. X
Only depress the accelerator pedal slightly.
X Have the cause rectified immediately at a qualified specialist work-
shop.
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it. A coolant temperature of over
120 °C is displayed. The coolant
warning lamp may also be on and
a warning tone may sound
(Y
page 97). The coolant level is too low. The
coolant is too hot and the engine
is no longer being cooled suffi-
ciently. X
Stop as soon as possible and allow the engine and the coolant to
cool down.
X Check the coolant level (Y page 175). Observe the warning notes
as you do so and top up the coolant if necessary. If the coolant level is correct, the
radiator fan may be faulty. The
coolant is too hot and the engine
is no longer being cooled suffi-
ciently. X
If the coolant temperature is less than 120 °C, you can continue
driving to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving on
mountain roads and stop/start driving. Practical advice
245_AKB; 2; 7, en-GB
wdomann,
Version: 2.11.4 2008-10-17T11:22:31+02:00 - Seite 234Dateiname: 6515_1640_02_buchblock.pdf; preflight

Jump-starting
266 Reconnecting the battery
! Always reconnect the battery in the
sequence described below. Never swap the
terminal clamps. You may otherwise dam-
age the vehicle electronics.
X Switch off all electrical consumers.
X Connect the positive terminal clamp and
secure the cover.
X Connect the negative terminal clamp.
X Connect the breather hose. Make sure that
a cell cap is fitted on the side.
i If the battery power supply has been inter-
rupted (e.g. if it has been reconnected), you
must carry out the following tasks:
R set the time (Y page 108).
R reset the function for folding the exterior
mirrors in/out automatically* by folding
the mirrors out once (Y page 71).
R reset the side windows (Y page 84) Jump-starting
If your vehicle's battery is discharged, the
engine can be jump-started from another
vehicle or from an external battery using jump
leads.
Observe the following points:
R Jump-starting may only be performed when
the engine and catalytic converter are cold.
R Do not start the engine if the battery is fro-
zen. Let the battery thaw first.
R Jump-starting may only be performed from
batteries with a nominal voltage of 12 V.
R Only use jump leads which have a sufficient
cross-section and insulated terminal
clamps.
i Jump leads and further information about
jump-starting can be obtained from any
Mercedes-Benz Service Centre.
! Avoid repeated and lengthy starting
attempts.
Never start the vehicle using a rapid battery
charger. G
Risk of injury
There is a risk of acid burns when jump-
starting a vehicle due to the gases which
escape from the battery. Do not lean over
the battery while the engine is being jump-
started. G
Risk of explosion
Gases escaping from the battery during
jump-starting may cause minor explosions.
Avoid creating sparks. Keep naked flames
away from the battery, and do not smoke.
Comply with safety precautions and take
protective measures when handling batter-
ies. You will find these under "Battery" in
the index.
X Make sure that the two vehicles do not
touch.
X Apply the parking brake.
X Manual transmission: engage neutral.
X AUTOTRONIC*: move the DIRECT SELECT
selector lever to P.
X Switch off all electrical consumers.
X Open the bonnet (Y page 171). Practical advice
* optional
245_AKB; 2; 7, en-GB
wdomann,
Version: 2.11.4 2008-10-17T11:22:31+02:00 - Seite 266Dateiname: 6515_1640_02_buchblock.pdf; preflight

Towing and tow-starting
269
Opening the rear cover
1
Cover
X Press cover 1back in the direction of the
arrow.
X Take cover 1off the opening.
Securing the towing eye X
Take the towing eye and the wheel wrench
from the vehicle tool kit ( Ypage 200).
X Screw in the towing eye clockwise to the
stop.
X Insert the wheel wrench handle into the
towing eye and tighten it. Towing the vehicle
! You may tow the vehicle for a maximum
of 50 km. A towing speed of 50 km/h must
not be exceeded.
For towing distances over 50 km, the entire
vehicle needs to be lifted up and transpor-
ted.
! The engine must be switched off (key in
ignition lock in position 0or position 1) if
the vehicle is being towed with the front
axle raised or if the parking brake is being
tested on a dynamometer. Otherwise,
intervention by ESP ®
could damage the
brake system.
Vehicles with manual transmission X
Turn the key to position 2(Y page 62) in
the ignition lock.
X Fully depress the clutch pedal.
X Shift to neutral. Vehicles with AUTOTRONIC* X
Turn the key to position 2in the ignition
lock.
X Move the selector lever to N. Tow-starting (emergency engine
starting)
Please note:
R Vehicles with AUTOTRONIC* must not be
tow-started.
R The battery must be connected.
R The engine and catalytic converter must be
cold.
R Avoid repeated and lengthy starting
attempts.
Vehicles with manual transmission X
Turn the key to position 2(Y page 62) in
the ignition lock.
X Fully depress the clutch pedal.
X Shift to neutral. Practical advice
* optional
245_AKB; 2; 7, en-GB
wdomann, Version: 2.11.4 2008-10-17T11:22:31+02:00 - Seite 269 ZDateiname: 6515_1640_02_buchblock.pdf; preflight