Fuel and exhaust gas cleaning
WARNING
Do not apply wax underneath the vehicle
around the area of the exhaust system: Fire
hazard!
Catalytic converter
To 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 ›››page359,
Checking and topping up the engine oil
level.
●
Never tow the vehicle to start it, use jump
leads if necessary ›››page339.
If you should notice misring, uneven running
or loss of power when the car is moving, have
the vehicle inspected by a specialised work-
shop. In general, the emissions warning lamp
will light up when any of these symptoms
occur. If this happens, any unburnt fuel can
enter the exhaust 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 irregular fuel supply can cause igni-
tion 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
working 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 lter
The particulate lter eliminates most of the
soot from the exhaust gas system. Under nor-
mal driving conditions the lter cleans itself.
If the lter 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 lter: cleaned while the vehi-
cle is moving. See Manual.
The particulate lter needs cleaning (regener-
ation).
Regeneration of the petrol particulate lter
(except TSI 2.0l petrol engines)
Requirements for the regeneration journey:
the engine must be at operating temperature.
●
Drive at a speed of between 50-120km/h
(31-75mph). This increases the temperature
and burns the soot in the lter ›››page335.
●
Consider the legal speed limits as well as the
recommended 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.
Regeneration of the particulate lter (only
for 2.0l TSI petrol engines)
Requirements for the regeneration journey:
the engine must be at operating temperature.
●
Drive at a speed of at least 80 km/h
›››page335.
●
Completely remove your foot from the ac-
celerator pedal for a few seconds to let the
vehicle roll with the gear engaged.
●
Consider the legal speed limits as well as the
recommended gears.
●
Repeat this procedure (accelerate and let
roll) until the control lamp turns o.