2008 AUDI S4 ron

Instruments and warning/indicator lamps15
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Caution
Never run the tank completely dry. The irregular supply of fuel can
cause misfiring, which would allow unburnt fuel to enter the
exhaust system. This can lead to overheating and damage to the
catalytic converter.Warning and indicator lampsOverview
The warning and indicator lamps indicate a number of
different functions and possible faults.Fig. 7 Instrument cluster with warning and indicator lamps

Dynamic steering
⇒page 16

Engine management (alternative
to)
⇒page 16

(alternative to
)
⇒page 16

Electronic stabilisation program (ESP)
⇒page 17

Airbag system
⇒page 17

Tyre pressure monitoring
⇒page 17

Left turn signals
⇒page 18

Trailer turn signals*
⇒page 18

Seat belt warning lamp
⇒page 18

Emission control system
⇒page 18

lane assist (active)
⇒page 18

lane assist (inactive)
⇒page 18

Main beam headlights
⇒page 18

Right turn signals
⇒page 18

Cruise control system*
⇒page 19
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Instruments and warning/indicator lamps
16Additional warning and indicator lamps are displayed on vehicles
equipped with the adap tive cruise control* ⇒page 134 .
Note
A number of functions are monitored by the auto-check control
⇒page 21 . If a malfunction should occur, this will be shown by the
display in the instrument cluster either with a red symbol (priority 1
– serious malfunction) or a yellow symbol (priority 2 – other
malfunction or item requiring attention).Applies to vehicles: with Audi drive selectDynamic steering

If the warning lamp
 lights up when you switch on the ignition and
goes out when the engine has starte d, the dynamic steering is acti-
vated.
If the warning lamp  stays on after the engine has started, this
indicates a malfunction in the system. You can continue driving
carefully at reduced speed to the next qualified workshop, however
the steering may feel heavier and its response may be more sensi-
tive than usual. In addi tion, it is possible that the steering wheel will
be off centre when driving in a straight line.
WARNING
Have the system malfunction in the dynamic steering repaired by
a qualified workshop as soon as possible – risk of accident.
Note
•
If the warning lamp
 flashes, this indicates that the dynamic
steering is being initialised. The message “Dynamic steering: Initial-
ising” ⇒page 36 will appear in the driver information system
display.
•
The stabilisation functions of the dynamic steering ⇒page 222
are not available in the event of a system malfunction.
Applies to vehicles: with petrol engineEngine management

This warning lamp monitors the engine management
system on petrol engines.The
 warning lamp (Electronic Power Control) lights up when the
ignition is switched on to show that the lamp is working properly.Note
If the warning lamp lights up while the vehicle is moving, this indi-
cates a fault in the engine management system. The engine should
be serviced by a qualified workshop without delay.Applies to vehicles: with diesel engineGlow plug system

The indicator lamp lights up to show that the glow plugs
are preheating.Your vehicle is equipped with an automatic glow plug system.
The indicator lamp
 lights up while the glow plugs are preheating.
If the engine fails to start imm ediately, the glow plugs have not
finished preheating. In this case, keep the clutch pedal depressed
(or keep your foot on the brake if your vehicle has an automatic
gearbox) until the engine starts.

Anti-lock brake system (ABS)
⇒ page 19

Electro-mechanical parking
brake/Audi hold assist*
⇒page 20

Fault in brake system
⇒page 20
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Instruments and warning/indicator lamps17
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Note
•
If the glow plug indicator lamp should start flashing while the
vehicle is moving, this indicates a fault in the engine management
system. The engine should be serviced without delay.
•
If the indicator lamp fails to light up when the ignition is
switched on, this can mean that the glow plug system is defective.
The engine should be serviced.
Electronic stabilisation program (ESP)

This warning lamp monitors the electronic stabilisation
program.The warning lamp
 has the following functions:
•
It flashes when the ESP or tracti on control system (ASR) inter-
venes while the vehicle is in motion.
•
The warning lamp will light up continuously if the ESP or the
traction control system (ASR) has been switched off using the ESP
OFF button ⇒page 222 .
•
It lights up when the ignition is switched on and should go out
again after about 2 seconds. This signals that the lamp is working
properly.
•
It will light up continuously if there is a malfunction in the ESP.
•
It will also come on if a fault should occur in the ABS because the
ESP operates in conjunction with the ABS.
If the battery has been disconnected , if the battery voltage is very
low, or if the engine has been started from an outside power source,
the ESP system will perform an initialisation of the various on-board
sensors while you drive the first few metres. The warning lamp will
light up during this period. It will go out when the initialisation has
been completed.
If the warning lamp lights up an d stays on after the engine is
started, this may mean that the control system has temporarily
switched off the ESP. In this case the ESP can be reactivated by switching the ignition off and then on again. If the warning lamp
goes out, this means the system is fully functional.
For further information on the ESP
⇒page 222 .
Airbag system

This warning lamp monitors the airbag and seat belt
tensioner system.The warning lamp
 should light up for a few seconds when the
ignition is switched on.
If the warning lamp does not go out, or if it lights up, flashes or
flickers when the vehicle is moving, this indicates a malfunction in
the system. This is also the case if the warning lamp does not light
up when the ignition is switched on.
WARNING
If a malfunction should occur, have the system checked immedi-
ately by a qualified workshop. If th is is neglected, there is a risk
that the airbag system and/or belt tensioners may not be acti-
vated in an accident.Tyre pressure monitoring

The tyre pressure should be corrected as soon as possible
if it is too low.If the
 symbol flashes for about a minute and then remains lit after
you switch on the ignition, there is a fault in the system. Please
contact the nearest qualified workshop as soon as possible.
For more detailed information on the tyre pressure monitoring
system, please refer to ⇒page 39 .
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Instruments and warning/indicator lamps
18Turn signals
 
Depending on which turn signal is operated, either the left
 or
right
 indicator lamp flashes. Both indicator lamps will flash when
the hazard warning lights are switched on.
If one turn signal should fail, the indicator lamp will start flashing
twice as fast.
This does not apply when towing a caravan or trailer. The indicator
lamp will stop flashing if one of the turn signals on the vehicle or the
caravan/trailer should fail. For further information on the turn
signals ⇒page 62 .
Applies to vehicles: with towing bracketTrailer turn signals

The indicator lamp flashes when the turn signals are
operated while towing a caravan or trailer.The indicator lamp
 flashes when the turn signals are operated,
provided a caravan or trailer is correctly attached and connected to
the vehicle.
The indicator lamp will not flash if one of the turn signals on the
trailer fails.
Seat belt warning lamp

The warning lamp acts as a reminder to fasten the seat
belts.After switching on the ignition, the warning lamp
 will remain lit
until the driver and front passenger (if applicable) have fastened
their seat belts. When the vehicle has gathered speed you will also
hear a warning chime.
For further information on the seat belts ⇒page 194 .
Emission control system

If the warning lamp lights up continuously you should take your
vehicle to a qualified workshop as soon as possible in order to have
the fault rectified.
If the warning lamp flashes drive on at reduced speed and seek
professional help in order to avoid damage to the catalytic
converter.
For further information on the catalytic converter ⇒page 229 .Applies to vehicles: with lane assistlane assist (active)

The indicator lamp confirms that the system is fully functional. You
will be warned if you are about to cross the lane markings detected
by the system.
For more information on the lane assist system, please see
⇒page 145 .lane assist (inactive)

The warning lamp indicates that the system is switched on.
However, you will not be warned if you cross the lane markings.
For more information on the lane assist system, please see
⇒page 145 .Main beam headlights

The indicator lamp
 lights up when the main beams are on or
when the headlight flasher is operated.
For further information on the main beam headlights ⇒page 62 .
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Instruments and warning/indicator lamps19
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Applies to vehicles: with cruise control systemCruise control

The indicator lamp
 in the instrument cluster lights up when the
cruise control system is operating.
Anti-lock brake system (ABS)

The warning lamp monitors the ABS and the electronic
differential lock (EDL).The warning lamp
 lights up for a few seconds when the ignition
is switched on and while the engine is being started. The lamp goes
out again once the system has run through an automatic test
sequence.
There is a fault in the ABS if:
•
the warning lamp
 does not light up when the ignition is
switched on,
•
the warning lamp does not go out again after a few seconds,
•
the warning lamp lights up when the vehicle is moving.
The vehicle can still be braked in the normal way (except that the
ABS control function is out of action). Please take the vehicle to a
qualified workshop as soon as po ssible. For further information on
the ABS ⇒ page 222.
If a fault occurs in the ABS, the ESP warning lamp will also light up.
Fault in the main brake system
If the ABS warning lamp
 lights up together with the brake
warning lamp
 ⇒ page 32 , this indicates a fault in the ABS func-
tion, and possibly a malfunction in the main brake system as well
⇒ .
If there is a malfunction in the brake system the symbol
 will light
up in the instrument cluster. Please refer to ⇒page 32 . Fault on the electronic differential lock (EDL)
The EDL works in conjunction with the ABS. If a malfunction should
occur in the EDL, this is indicated by the ABS warning lamp
.
Please take the vehicle to a qualified workshop as soon as possible.
For further information on the EDL ⇒page 222 .
WARNING
•
Before opening the bonnet and ch ecking the brake fluid level,
observe the warning information on ⇒page 255, “Working on
components in the engine compartment”.
•
If the brake warning lamp
 should light up together with the
ABS warning lamp
, stop the vehicle imm ediately and check the
brake fluid level in the reservoir. If the fluid level has dropped
below the "MIN" mark you must no t drive on - otherwise there may
be an increased acciden t risk. You should obtain professional
assistance.
•
If the brake fluid level is OK, the fault in the brake system may
have been caused by a failure of the ABS control function. As a
result the rear wheels can lock relatively easily when braking. This
could cause the tail of the vehicle to skid sideways. Drive carefully
to the nearest qualified workshop and have the fault rectified.
Applies to vehicles: with Audi hold assistAudi hold assist

This warning lamp monitors the Audi hold assist function.Audi hold assist helps the driver to keep the vehicle stationary while
the engine is running, for instance on steep gradients, at traffic
lights or in stop-and-go traffic. When the Audi hold assist function
is on, you don't have to keep your foot on the brake to prevent the
vehicle from accidentally rolling away. Once it detects that the
vehicle is stopped, Audi hold assist keeps the vehicle stationary. The
green symbol
 in the instrument cluster indicates that the func-
tion is activated. You can now take your foot off the brake pedal.
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Instruments and warning/indicator lamps
20When the vehicle has been stationary for an extended period, Audi
hold assist will automatically appl y the parking brake. In this case,
the green symbol
 will change to red
.
Electro-mechanical parking brake

This warning lamp monitors the electro-mechanical
parking brake.The warning lamp
 lights up when the parking brake is applied
with the ignition on. After the ig nition has been switched off the
lamp will stay on for about 30 seconds. The warning lamp will light
up for about 30 seconds if the parking brake is applied with the igni-
tion switched off.
The warning lamp should go out when the parking brake is released.
If the warning lamp flashes continuously after the parking brake has
been applied , the brake may not be strong enough to hold the
vehicle on a slope. This may be due to the brakes overheating.
Please note the following points:
•
If the gradient is too steep to park the vehicle safely, the display
will show the message Caution: Vehicle parked too steep .
•
In the event of a fault in the parking brake system the symbol

will also appear in the instrument cluster display together with the
message Parking brake! You should have the fault corrected by a
qualified workshop without delay.
Brake system

The warning lamp flashes if the brake fluid level is too low
or if there is a fault in the ABS system or the parking
brake.If the warning lamp
 flashes, there is a fault in the brake system.
The symbol
 in the instrument cluster display will flash at the same time. You can press the button to obtain a message
explaining the fault
⇒page 32 .
If a failure should occur in the ABS, the ABS warning lamp
 will
light up together with the brake warning lamp
 ⇒ .
WARNING
•
Before opening the bonnet and ch ecking the brake fluid level,
observe the warning information on ⇒page 255, “Working on
components in the engine compartment”.
•
If the brake warning lamp does not go out, or if it lights up
when driving, the brake fluid level in the reservoir is too low – this
may cause an increased accident risk. Stop the vehicle and do not
drive on. You should obtain professional assistance.
•
If the brake warning lamp lights up together with the ABS
warning lamp, this can mean that the control function of the ABS
is out of action. As a result the rear wheels can lock relatively
easily when braking. This could caus e the tail of the vehicle to skid
sideways. Drive carefully to the nearest qualified workshop and
have the fault rectified.
SET
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Driver information system
34
will disappear after about 5 seconds, but you can call it up
again at any time by pressing the button:Switch off engine and check oil level
– Stop the vehicle.
– Switch off the engine.
– Check the engine oil level ⇒page 258 .
– Obtain professional assistance if necessary.If the engine oil level is too low
If the engine oil level is too low, add more oil ⇒page 259 .
If the engine oil level is correct
If the

symbol flashes and the engine oil level is correct, obtain
professional assistance. Do not drive on. Do not continue to run the
engine, not even at idle speed .
Note
The oil pressure warning lamp

is not an indicator for the oil
level. The oil level should therefore be checked regularly.
Add engine oil immediately

 WARNING! Please add oil immediately
If the  symbol lights up, you must add oil immediately
⇒ page 259 .
Fault in the steering system

The steering wheel cannot be unlocked if there is a fault
in the electronic steering lock.If the symbol

flashes in the display, there is a malfunc-
tion in the electronic steerin g lock. The symbol is accompa-
nied by a driver message giving you more information
about the fault. This message will disappear after about
5 seconds, but you can call it up again at any time by
pressing the button:
Do not drive vehicle. Steering defective
– You should obtain professional assistance.
– Do not have the vehicle towed away.
WARNING
The vehicle must not be towed if th ere is a fault in the electronic
steering lock: the steering will be locked and the vehicle cannot be
steered. Towing a vehicle with lo cked steering can cause an acci-
dent.
Note
On some models the symbol may look slightly different.Ignition lock defective

A fault in the ignition lock must be rectified immediately.If the symbol

flashes in the display, there is a malfunc-
tion in the electronic ignition lock. The symbol is accompa-
nied by a driver message giving you more information
about the fault. This message will disappear after about
SET
SET
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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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