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Fuel and exhaust gas cleaning
249
Engine management and emissions control system
Catalytic converter
T
o maintain the useful life of the catalytic
converter
●
Only use unleaded petrol with petrol en-
gines.
●
Never run the fuel tank dry.
●
When changing or adding engine oil, do not
exceed the necessary amount ›››page276,
Checking and topping up the engine oil level.
●
Never tow the vehicle to start it, use jump
leads if necessary ›››page253.
If you should notice misfiring, uneven running or
loss of power when the car is moving, have the
vehicle inspected by a specialised workshop.
In general, the emissions warning lamp
will
light up when any of these sympt
oms occur. If
this happens, any unburnt fuel can enter the ex-
haust system and escape into the atmosphere.
The catalytic converter can also be damaged
by overheating.
NOTICE
Never run the fuel tank completely dry be-
cause an irr
egular fuel supply can cause ig-
nition faults. This allows unburnt fuel to enter
the exhaust system, which could cause over-
heating and damage the catalytic converter.
For the sake of the environment
Even when the emission control system is
w
orking perfectly, there may be a smell of
sulphur from the gases on occasions. This
depends on the sulphur content of the fuel
used. This can quite often be avoided by
changing to another brand of fuel.
Particulate filter
The particulate filter eliminates most of the
soot from the exhaust gas system. Under nor-
mal driving conditions the filter cleans itself.
If the filter does not clean itself (e.g. if short
journeys are made continuously), it becomes
blocked with soot and the following indication is
displayed to the driver:
Particulate filter: cleaned
while the vehicle is moving. See
Manual.
The particul
ate filter needs cleaning (regenera-
tion).
Regeneration of the petrol and diesel partic-
ulate filter
Requirements for the regeneration journey: the
engine is at operating temperature.
●
Drive at a speed of between 50120 km/h
(31-
75mph). This increases the temperature
and burns the soot in the filter ›››page249.
●
Consider the legal speed limits as well as the
r
ecommended gears.
●
End the regeneration journey once the con-
trol warning lamp has gone out.
If the warning lamp stays on after 30 minutes
of running in regeneration mode, have a speci-
alised workshop repair the fault.
WARNING
Always adjust your speed to suit the weather
conditions, r
oads, braking distance and traf-
fic if the particulate filter is in its regeneration
phase. Route recommendations should never
make you disregard each country's specific
trac regulations.
NOTICE
●
When the exhaust system detects that the
par
ticulate filter is close to saturation, the
self-cleaning function of this system recom-
mends optimal driving for this function.
●
Due to the high temperatures caused by
the regeneration of the particulate filter, it is
possible that the radiator fan will activate af-
ter stopping the engine, even it its operating
temperature has not been reached.
●
Noise, smells and high idle speeds can oc-
cur during regeneration.
●
Always use the correct engine oil and the
correct fuel to make sure the useful life of the
particulate filter is not aected. Also avoid
making short trips all the time.
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