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Operation
lower and you will prevent the clutch plate
from being d
amaged.
●
On descents, use the engine brake, chang-
ing to the gear that is more suitable for the
slope. Fuel consumption will be “zero” and
the brakes will not suffer.
Engine management and emis-
sion contr
ol system
Introduction
WARNING
●
Becau
se of the high temperatures which
can occur in the exhaust purification system
(catalytic converter or diesel particulate fil-
ter), do not park the vehicle where the ex-
haust can come into contact with flammable
materials under the car (e.g. on grass or at
the forest edge). Fire hazard!
●
Do not apply wax underneath the vehicle
around the area of the exhaust system: Fire
hazard!
Note
While the control lamps , , or or
remain lit, ther
e may be engine problems,
fuel consumption may increase and the en-
gine may lose power.
Catalytic converter
To maintain the useful life of the catalytic
conv
erter
–
Use only unleaded petrol with petrol en-
gines, as lead damages the catalytic con-
verter.
–
Do not let the fuel get too low in the tank.
–
For engine oil changes, do not replenish
with too much engine oil ››› page 268, Top-
ping up engine oil.
–
Never tow the vehicle to start it, use jump
lea
ds if necessary
›››
page 71.
If you notice misfiring, uneven running or
loss of power when the vehicle is moving, re-
duce speed immediately and have the vehi-
cle inspected at the nearest specialised
workshop. In general, the exhaust warning
lamp will light up when any of the described
symptoms occur
›››
page 122. If this hap-
pens, unburnt fuel can enter the exhaust sys-
tem and escape into the environment. The
catalytic converter can also be damaged by
overheating.
CAUTION
Never run the fuel tank completely dry be-
cause the irr
egularity of the fuel supply may
cause ignition problems. This allows unburnt
fuel to enter the exhaust system, which could
cause overheating and damage the catalytic
converter.
For the sake of the environment
Even when the emission control system is
workin
g perfectly, there may be a smell of
sulphur from the exhaust gas under some
conditions. This depends on the sulphur con-
tent of the fuel used. Quite often the problem
can be solved by changing to another brand
of fuel.
Diesel particulate filter
3 Applies to vehicles with diesel engine
The die
sel engine particulate filter eliminates
most of the soot from the exhaust gas sys-
tem. Under normal driving conditions, the fil-
ter cleans itself. The diesel particulate filter is
cleaned automatically without need for indi-
cation by the warning lamp . This may be
noticed because the engine idle speed in-
creases and an odour may be detected.
If automatic filter purification cannot be car-
ried out (because only short trips are taken,
for example), soot will accumulate on the fil-
ter and the Diesel particulate filter warning
lamp will switch on.
Facilitate the automatic filter cleaning proc-
ess by driving in the following manner: drive
for approximately 15 minutes at a minimum
speed of 60 km/h (37 mph) in 4th or 5th gear
(automatic gearbox: gear S). Maintain the en-
gine speed at approximately 2,000 rpm. The
rise in temperature causes the soot on the
202
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