2008 AUDI S4 air filter

Driver information system35
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
5 seconds, but you can call it up again at any time by
pressing the button:
Ignition lock defective. Contact workshop!
– Do not switch off the engine.
– Drive the vehicle without delay to a qualified workshop and have the fault repaired.The ignition cannot be switched off if there is a fault in the elec-
tronic ignition lock. For this reason, you should drive the vehicle
without delay to a qualified work shop and have the cause of the
fault repaired.
If the vehicle is equipped with the advanced key* feature, you
should not switch off the engine with the Stop/Start button because
it cannot be started again after the ignition has been switched off.
Note
On some models the symbol may look slightly different.Yellow symbols
A yellow symbol indicates a malfunction or other item
requiring attention.
Yellow symbols indicate a Priority 2 fault.
Yellow symbols are accompanied by one warning chime. The
symbol is accompanied by a driver message giving you more infor-
mation about the fault. This me ssage will disappear after about
5 seconds, but you can call it up again at any time by pressing the button.
The function indicated should be checked as soon as possible. The
yellow symbol will only go out when the fault has been rectified.
If several Priority 2 faults are detected at the same time, the symbols
are displayed one after the other for about 2 seconds at a time.
SET
Fig. 26 Display: Yellow
warning symbol

Dynamic steering
⇒ page 36 and
⇒ page 159

Brake pads worn
⇒page 37

Battery power*
⇒page 38

Bulb monitor*
Bulb failure*
⇒page 37

Check engine oil level
⇒page 38 or
⇒ page 38

Engine oil sensor defective
⇒page 38

Fuel level low
⇒page 37

Washer fluid level low*
⇒page 37

advanced key*
Key not in vehicle
⇒page 36

Light sensor/rain sensor defec-
tive
⇒page 37

Diesel particulate filter*
obstructed
⇒page 38
SET
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Driver information system
38Applies to vehicles: with battery power warning systemBattery power

If battery power drops to a level at which you may encounter prob-
lems when starting the engine, th e display will show the symbol

and the driver message Low battery charge: Battery will be charged
while driving .
Please bear in mind that the star ting ability of the engine may be
impaired while this message is shown.
Message comes on and goes out again
If the message appears in the displ ay after the ignition is switched
on or while driving, and goes out again after a period of time, the
battery has been charged up again sufficiently while the vehicle was
being driven.
Message comes on and does not go out
If the message appears in the displ ay after the ignition is switched
on or while driving, and does not go out again, the battery is not
being maintained at the proper power level. Starting reliability may
be impaired. You should have the battery checked by a qualified
workshop as soon as possible.
Engine oil level (without dipstick)

 Add oil, max. 1L. You may continue driving.
If the  symbol lights up in conjunction with this driver message,
add not more than 1 litre of oil at the next opportunity
⇒ page 259 .
Check engine oil level (with dipstick)

 Please check oil level If the
 symbol lights up in conjunction with this driver message,
please check the engine oil level as soon as possible ⇒page 258 .
Top up the oil at the next opportunity ⇒page 259 .
Engine oil sensor defective


Oil level ! Sensor defective
If the 
symbol lights up, take the vehicle to a qualified workshop
and have the oil level sensor checked. Until then it is advisable to
check the oil level every time you fill up with fuel ⇒page 258 .
Applies to vehicles: with diesel engine and diesel particulate filterDiesel particulate filter obstructed


Particle filter. See Owner's Manual
When the symbol

lights up you can assist the self-cleaning func-
tion of the filter by driving accordingly. You should drive at a speed
of at least 60 km/h (engine speed about 2,000 rpm) for about
15 minutes in 4th or 5th gear, or with the selector lever in position S
on vehicles with automatic gearbox*. As a result of the increase in
temperature the soot in the filter will be burned off. The symbol will
disappear once the cleaning proce ss has been completed success-
fully.
If the symbol

does not go out, please contact a qualified work-
shop and have the fault rectified.
For further information on the diesel particulate filter ⇒page 229 .
WARNING
It is essential that you adjust your speed to suit the weather, road,
terrain and traffic co nditions. The recommended driving speed
must never lead to the driver disregarding the traffic regulations.
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Heating and cooling93
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Heating and coolingDeluxe automatic air conditionerApplies to vehicles: with deluxe automatic air conditionerDescription
The air conditioner can be used to set a comfortable inte-
rior temperature in the vehicle.The air conditioner provides heatin g and ventilation and also cools
and dehumidifies the air inside the vehicle.
The air conditioner is fully automatic and will maintain the desired
temperature at a constant level. To achieve this, the temperature of
the air supplied to the interior, the blower speed (volume of air
delivery) and the air distribution are regulated automatically. The
system also allows for the effect of strong sunlight, so there is no
need for manual adjustment. For these reasons it is advisable to use
the automatic mode for the comfort of all the passengers in virtually
all conditions throughout the year ⇒page 95 .
Please note:
The humidity of the air is automatically reduced when the system
cools the interior of the vehicle. This helps to prevent condensation
on the windows.
If the humidity and temperature outside the vehicle are high,
condensation can drip off the evaporator in the air cooling system
and form a pool underneath the vehicle. This is normal and does not
indicate a leak.
If the outside temperature is low, the blower normally only switches
to a higher speed once the coolant has warmed up sufficiently (this
does not apply to the defrost setting).
In order to achieve maximum engine power, the air conditioner
compressor is temporarily switched off when pulling away from a
standstill with full throttle. The compressor also switches of
f if the coolant temperature is
excessively high, to ensure adequate engine cooling under extreme
loads.
Pollution filter
The pollution filter (a particle filt er) serves as a barrier against impu-
rities in the outside air, including dust and pollen, and odours. The
air is also filtered when the air recirculation mode is activated.
For the air conditioner to work with maximum efficiency, the pollu-
tion filter element must be replaced at the intervals specified in the
Service Schedule.
If the vehicle is driven in areas with a high level of air pollution and
the filter is no longer fully effective, it may be necessary to change
the filter element more frequently.
Key-coded settings
The currently selected air conditioner settings are automatically
stored and assigned to the remote control key.
Power management
To prevent the battery from becoming discharged and to maintain
the necessary power level, the syst em will temporarily shut off the
electrical components that are usin g a lot of power, or reduce the
current they are consuming ⇒page 226 . Heating systems in partic-
ular use a large amount of electrical power. If you notice, for
instance, that the rear window heater is not working, it may have
been temporarily switched off by the power management function,
or regulated to a lower heat output. These systems will be available
again as soon as sufficient electrical power is available.
WARNING
For safety reasons it is important that all the windows are kept
free of ice, snow and condensation. These can cause poor visibility
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Heating and cooling97
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
The blower speed will be shown on the screen
⇒page 96, fig. 107
for a few seconds if the sound system or MMI* is switched on.
Note
•
The blower speed may change automatically. This ensures that
the selected temperature is reached as quickly as possible.
•
The blower speed cannot be regulated separately for the driver
and front passenger sides of the vehicle.
Applies to vehicles: with deluxe automatic air conditionerAir recirculation mode
The air recirculation setting prevents fumes etc. from
entering the interior.Switching on the air recirculation mode
– Press the button ⇒.
Switching off the air recirculation mode
– Press the button again, or
– Press the button, or
– Press the button.In this setting, the air is drawn from the interior of the vehicle,
filtered and continuously recirculated. We recommend using the air
recirculation mode in the following circumstances:
When driving through a tunnel or in queues of traffic, to prevent
fumes entering the interior of the vehicle.
WARNING
For reasons of safety you should not leave the air recirculation
switched on for too long. This mode prevents fresh air from entering the vehicle, so the windows can mist over if the air
cooling is switched off. Bad visibility can cause an accident.
Applies to vehicles: with deluxe automatic air conditioner Air distribution

The automatically programmed air distribution can be
altered manually if required.– Press the button for
Distribution

.
– Turn the rotary control to the desired setting.

AUTO
WARNING (continued)
Fig. 108 Air distribu-
tion button and rotary
controlFig. 109 Display: Air
distribution
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Heating and cooling101
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Applies to vehicles: with diesel engineSupplementary heater– Set the Supplementary heater to auto or off .Models with a diesel engine are equipped with a supplementary
heater to help warm up the interior more quickly. At outside temper-
atures below about +5 °C the supple mentary heater is switched on
(and off) automatically when the engine is running, depending on
the coolant temperature, the temperature in the vehicle interior and
the temperature the heater is set to.Deluxe automatic air conditioner plusApplies to vehicles: with deluxe automatic air conditioner plusDescription
The air conditioner is designed to keep the passenger
compartment at the temperature you find most comfort-
able at all times of the year.The air conditioner provides heatin g and ventilation and also cools
and dehumidifies the air inside the vehicle.
The air conditioner is fully automatic, and will maintain the desired
temperature at a constant level. To achieve this, the temperature of
the air supplied to the interior, the blower speed (volume of air
delivery) and the air distribution are regulated automatically. The
system also allows for the effect of strong sunlight, so there is no
need for manual adjustment. For these reasons it is advisable to use
the automatic mode for the comfort of all the passengers in virtually
all conditions throughout the year ⇒page 103 .
Please note:
The humidity of the air is automatically reduced when the system
cools the interior of the vehicle. This helps to prevent condensation
on the windows. If the humidity and temperature outside the vehicle are high,
condensation
can drip off the evaporator in the air cooling system
and form a pool underneath the vehicle. This is normal and does not
indicate a leak.
If the outside temperature is low, the blower normally only switches
to a higher speed once the coolan t has warmed up sufficiently (this
does not apply to the defrost setting).
In order to achieve maximum engine power, the air conditioner
compressor is temporarily switch ed off when pulling away from a
standstill with full throttle.
The compressor also switches of f if the coolant temperature is
excessively high, to ensure adequate engine cooling under extreme
loads.
Pollution filter
The pollution filter (a combined particle filter and activated charcoal
filter) serves as a barrier against impurities in the outside air,
including dust and pollen, and against unpleasant smells. The air is
also filtered when the air recirculation mode is activated.
For the air conditioner to work with maximum efficiency, the pollu-
tion filter element must be replaced at the intervals specified in the
Service Schedule.
If the vehicle is driven in areas with a high level of air pollution and
the filter is no longer fully effective, it may be necessary to change
the filter element more frequently.
Key-coded settings
The currently selected air conditioner settings are automatically
stored and assigned to the remote control key.
Power management
To prevent the battery from becoming discharged and to maintain
the necessary power level, the syst em will temporarily shut off the
electrical components that are usin g a lot of power, or reduce the
current they are consuming ⇒page 226 . Heating systems in partic-
ular use a large amount of electrical power. If you notice, for
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Heating and cooling105
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
– Press the button for the blower .
– Turn the rotary control to set the blower to the desired speed (and regulate the volume of air delivery).The air conditioning system automatically regulates the blower
speed according to the interior te mperature. However, you can also
adjust the blower speed manually.
The blower speed will be shown on the screen ⇒fig. 116 for a few
seconds if the sound system or MMI* is switched on.
Note
•
The blower speed may change automatically. This ensures that
the selected temperature is reached as quickly as possible.
•
The blower speed cannot be regulated separately for the driver
and front passenger sides of the vehicle.
Applies to vehicles: with deluxe automatic air conditioner plusAir recirculation mode
The air recirculation setting prevents fumes etc. from
entering the interior.Switching on the air recirculation mode
– Press the button ⇒.
Switching off the air recirculation mode
– Press the button again, or
– Press the button, or
– Press the button.In this setting, the air is drawn fr om the interior of the vehicle,
filtered and continuously recirculated. We recommend using the air
recirculation mode in the following circumstances:
When driving through a tunnel or in queues of traffic, to prevent
fumes entering the interior of the vehicle.
WARNING
For reasons of safety you should not leave the air recirculation
switched on for too long. This mo de prevents fresh air from
entering the vehicle, so the windows can mist over if the air
cooling is switched off. Bad visibility can cause an accident.
Fig. 116 Display:
Blower setting


AUTO
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Heating and cooling109
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Deluxe automatic air conditioner plus
- basic settingsApplies to vehicles: with deluxe automatic air conditioner plusGeneral notes
The basic settings for the air conditioner can be adjusted
via the sound system or MMI*.– Select: Function selector button > control button
AC.The following functions are available:•
Automatic air recirculation ⇒page 109
•
Synchronisation ⇒page 109
•
Auxiliary heating* ⇒page 110
•
Auxiliary ventilation* ⇒page 110
•
Running time* ⇒page 112
•
Timer status* ⇒page 111
•
Timer 1* ⇒page 111
•
Timer 2* ⇒page 111
•
Timer 3* ⇒page 111
•
Supplementary heater* ⇒page 110
Applies to vehicles: with deluxe automatic air conditioner plusAutomatic recirculation
If the outside air is polluted, an air purity sensor in the
vehicle will automatically switch on the air recirculation.To prevent fumes, etc. in the outside air from entering the interior,
we recommend that the automati c air recirculation should be
switched on at all times.
If the air purity sensor in the air conditioner system detects a certain
concentration of fumes in the outside air, the control unit will either
pass the incoming air through the pollution filter or automatically
switch on the air recirculation. If there is a high concentration of
pollution in the outside air, the air conditioner automatically
switches to air recirculation and cuts off the supply of air from the
outside. As soon as the level of pollution decreases, air is fed into
the vehicle from the outside again.
If the windows mist up when the automatic air recirculation is on,
press the
 button immediately.
The automatic air recirculation can switch itself off in certain condi-
tions. If the outside temperature is less than about +10 °C, the auto-
matic air recirculation will only operate for 30 seconds. If the air
conditioner is switched to the ECON mode, or if the outside temper-
ature is less than about -1 °C, th e automatic air recirculation will
only operate for 15 seconds.
Applies to vehicles: with deluxe automatic air conditioner plusSynchronisation
The air conditioner settings can be synchronised for all
passengers.When the synchronisation function is switched on, all subsequent
air conditioner settings made on the driver's side (except for the
seat heating*) are also applied to the front passenger's side.
Fig. 120 Display:
Setup AC
CAR
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Fuel and filling the tank251
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Fuel and filling the tankPetrolApplies to vehicles: with petrol enginePetrol grade
The correct grade of petrol is listed inside the fuel tank
flap.The vehicle is equipped with a catalytic converter and must only be
run on unleaded petrol . Unleaded petrol must comply with the
European EN 228 standard. The petrol grades have different octane
ratings (RON). If, in exceptional circumstances, the correct octane
rating is not available, please note the following:•
For engines which require Premium unleaded petrol (95 RON)
according to ⇒page 323, “Performance, weights and dimensions”:
Regular unleaded fuel with 91 RON can also be used. This will,
however, result in a slight loss of power.
•
For engines which require Super Plus unleaded petrol (98 RON)
according to ⇒page 323, “Performance, weights and dimensions”:
Premium unleaded fuel with 95 RON can also be used. This can,
however, result in a slight loss of power under certain driving condi-
tions. – If premium unleaded petrol is not available, the engine can
be run on regular unleaded petrol with 91 RON as an emergency
measure . In this case only use moderate engine speeds and a light
throttle. Fill up with premium or Super Plus petrol as soon as
possible.Caution
•
Petrol complying with the EN 228 standard can contain small
quantities of ethanol. However, “bioethanol fuels”, which are
retailed under various different names such as E50 and E85, and
which contain a large proportion of ethanol, must not be put into
the vehicle, as this would damage the fuel system.
•
Even one tankful of leaded fuel would permanently impair the
efficiency of the catalytic converter.
•
High engine speed and full throttle can damage the engine when
using petrol with an octane rating lower than the correct grade for
the engine.
DieselApplies to vehicles: with diesel engineDiesel fuel
Please note the information on the inside of the fuel tank
flap.Diesel fuel must comply with the European EN 590 standard. It must
have a cetane number (CN) of at least 51. The cetane number indi-
cates the ignition quality of the diesel fuel.
Winter-grade diesel
Diesel fuel can thicken in winter. For this reason petrol stations in
some countries also offer winter diesel.
Caution
•
The vehicle is not designed for the use of biodiesel (FAME fuel).
The fuel system would be damaged if you used biodiesel.
•
Do not mix fuel additives (“thinners”, petrol or similar additives)
with the diesel fuel.
•
If poor-quality diesel fuel is used, it may be necessary to drain
the water separator on the fuel filter more frequently than is speci-
fied in the Service Schedule. We recommend having this done by a
specialist workshop. If water is allowed to collect in the filter, this
can cause engine performance problems.
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