check engine AUDI S8 2009 Owner's Manual

Opening and closing
Switches for front door windows
@ operates the window in the driver's door.
@ operates the window in the front passenger's door.
Switches for rear windows
© operates the left rear window.
@ operates the right rear window .
Safety switch
© Safety switch for rear window operation.
& WARNING
• Do not leave children unattended in the vehicle, especially with
access to vehicle keys. Unsupervised use of the keys can result in
starting of the engine and use of vehicle systems such as power
windows, etc. which could result in serious injury.
• Remember -you can still open or close the power windows for
about ten minutes after the ignition is switched off. Only when
either of the front doors are opened are the power windows
switched off.
• Be careful when closing the windows. Check to see that no one
is in the way, or serious injury could result!
• Always remove the ignition key whenever you leave your
vehicle.
• If you lock your vehicle from the outside, no one, especially chil­
dren, should remain in the vehicle.
• Do not stick anything on the windows or the windshield that
may interfere with the driver's field of vision.
[ i] Tips
• In addition to the switches in the driver's door there is a separate
switch in each door for the power window in that door=>
page 63,
fig.
50 .
• The driver can lower or raise the power side blinds * in the side
windows by using switches © and
@. •
Switches in the driver's door
The driver can operate all windows.
If the respective switch is pushed or pulled the window will
open or close. The power window switches have a
two-posi­
tion function:
Opening the windows
- Push the switch to the first stop and hold it there until the
window has lowered to the desired position.
- Push the switch briefly to the
second stop: the window
will automatically open all the way.
Closing the windows
-Pull the switch up to the first stop and hold it there until
the window has risen to the desired position.
- Pull the switch quickly to the
second position: the
window will automatically close all the way=>
& in
"Controls" on
page 61.
Activating/deactivating rear windows
- Push the switch ®=> page 61, fig. 48 to the depressed
position to activate the rear windows - the light in the
switch will go out.
- Briefly press the switch ® to
deactivate the rear
windows - the switch will return to the safety position
and the light
I will illuminate.

Opening and closing
-In position @, briefly press the control to tilt the roof up
completely.
- To tilt the roof open to any intermediate position press
and hold the switch until the roof reaches the desired
position.
Sliding the roof open
- Turn the switch to position (D to open the roof all the
way.
- Turn the switch to any other position to open the roof to
any intermediate position.
When the glass roof opens, the sun visor, which is designed to ward
off strong sunlight, opens along with it. The visor can be closed
manually when the sunroof is closed.
[ i J Tips
• Be aware that the sunroof may actually be open when the sun
visor is closed. Check and make sure that the sunroof is shut when
parking the car or if it suddenly starts raining.
• If the sunroof is not fully closed but you have pressed and held
the switch for the tilt position, the sunroof will not tilt. •
Closing the power sunroof
Sliding the roof shut
- Turn the rotary switch to position®=> page 65, fig. 53
=> & .
Tilting the roof shut
-Briefly pull the rotary switch to close the roof. -
To tilt the roof down to any intermediate position pull and
hold the switch until the roof reaches the desired posi­
tion.
& WARNING
Improper use of the power sunroof can cause serious personal
injury.
• Be careful when closing the power sunroof. Not paying atten­
tion could cause you or others to be trapped and injured as the
roof closes.
• Always take the key with you when you leave the vehicle to
prevent injuries caused by the roof closing.
• Never leave children or persons requiring assistance alone in
the vehicle, especially when they could access the vehicle keys. Unsupervised use of the keys can result in the engine being
started or use of vehicle systems such as the power windows, etc.
which could result in serious injury. The doors could be locked
with the remote key, delaying help in an emergency.
• The power sunroof will continue to operate until the ignition
key has been removed and one of the front doors has been
opened. •
Power emergency closing
The sunroof can still be closed electrically if for some
reason the overload protection function becomes acti­
vated.
The power sunroof is equipped with an overload protection
feature. If, under normal conditions, the power sunroof will
not close, you can close it using this feature.
- Turn the rotary switch to position ®=>page 65, fig. 53 . .,_

Clear vision
Lights
Switching the headlights on and off ·'t!-·
In the "AUTO " position, a light sensor automatically
s w itches t he head- and tailligh ts on and off in response to
l ight con ditio ns.
Fig . 56 Instrument
p an el: light switch
Switching on automatic headlight control
- T urn th e lig ht switch to AUTO => fig. 56 .
Switching on the side marker lights
- T urn the light switch to ~oo~.
Switching on the headlights and high beam
- T urn th e li ght swit ch to fD.
- Pu sh the high beam leve r forw ard towa rds t he instru -
m ent panel
=> page 73 .
Switching off the lights
- T urn t he light switch to 0 .
Con tro ls and eq uip­
ment
Clear vision
The headlights only work when the ignition is switched on . While
starting the engine or when switching off the ignition, the head ­
lights will go off and only the side marker lights will be on.
After starting the engine, the xenon headlights are automa tically
adjus ted to the load and a ngle of the vehic le (for example, during
acceleration , braking) . This prevents oncoming traffic from exper i­
encing unnecessary headl ig ht g la re from your xenon head ligh ts .
If the system is not operating properly, a warning symbol in the
Auto -Check Contro l is displayed => page
36.
With the side marke r lights or head ligh ts switched on, the sym bol
next to the light switch illuminates
:oo:.
Daytime running lights
• USA models : The daytime running lights wi ll come on automati­
ca lly when the ig nition is turned on and the ligh t swi tch => fig. 56 is
in the
O position or the AUTO position (only in daylight conditions).
The
Daytime running lights func tio n can be tur ned on and off in the
MMI menu
E xterior lighting => page 70 => & .
• Canada models: The dayti me ru nn ing lights wi ll come on au to ­
matically when the ignition is turned on and the light switch
=> fig. 56 is i n the
O po sitio n or the AUTO po siti on (only in dayligh t
condi tions) => & .
Automatic headligh t control
In the switch posi tion AUTO the automatic headlight cont ro l is
t urned on . The low beams are turned on automa tica lly through a
light sensor as soon as ambient brightness (e .g . when driving into a
t unnel) fa lls below a value preset at the factory . When ambient
brightness increases again, the low beams are turned off again
aut omatically =>& .
I n the
AUTO posit io n the low beams are switched off automatically
when the ignition is turned off. If the high beams were switched on,
they w ill come o n again the ne xt time the a utomatic head ligh t
~
Vehicle care I I irechnical data

_________________________________________________ O_ n_ t_h _e _ ro_ a_d _ __._
0 Not e
If the warning/indicator light (U.S. models : BRAKE, Canadian models:
CCD) ) flashes in the instrument cluster, there is a brake system
malfunction. By pressing the
I CHECK] button, you can bring up a
driver m essage which explains the malfunction in more detail. If the
message
P arking br ake ! Plea se contact work shop appears, there is
a parking brake malfunction which you should have repaired imme ­
diate ly by an au thorized dealership ~
page 30. •
Cruise control
Switching the system on
The cruise control system makes it possible to drive at a
constant speed starting at 20 mph (30 km/h).
Con tro ls and eq uip­
ment
F ig . 149 Contro l le v er
w ith set butt on F
ig . 150 D ispla y:
Se lecte d sp ee d
Pull the lever to positi on G) => fig. 149 to swi tc h the
system on .
Drive a t th e speed yo u w ish to set .
Press button
© to set that speed.
The display ~ fig. 150 will show the set speed. The display may vary
depe nding on the type of display in your vehic le. The indicator light
CRUISE (US model)/ 0" (Canadian model) will a lso light up in the
instrument cluster.
The speed is kept constant via an engine output adjustment or active brake intervention .
& WARNING
• Alway s pa y attention to traffic even when the crui se control is
s w itched o n. You are alwa ys respo nsible f or your speed and the
d is tan ce bet ween your vehicl e and other vehi cle s.
• For safety reason s, the cruise con trol s hould not be used in the
c ity , in stop -and -go tra ffi c, o n twi sting road s and when road condi ­
tion s are po or (s uch a s ice, fog, gr avel , he avy rain and h ydro ­
pl anin g) -ris k of a ccident.
• Turn off the crui se co ntro l te mpo rarily whe n ente rin g turn
lan es, highwa y exit la ne s or in con stru ction zon es.
Vehicle care
I I irechnical data

-Intelligent technology --=---=-=-------------
Overheating
of brakes
To prevent the disc brake of the braked wheel from overheating if
subjected to excessive loads, the EDL cuts out temporarily . The
vehicle remains operational and behaves in the same way as a
vehicle without EDL.
As soon as the brake has cooled down, EDL switches on again auto ­
matically.
& WARNING
• When accelerating on slippery surfaces, such as on ice or snow,
always be careful when depressing the accelerator pedal. Even
with the EDL working, the drive wheels can spin and reduce your ability to control your car. Risk of crash!
• The increased safety afforded by EDL does not mean that you
can take safety risks . Always adapt your driving style to the road
conditions and traffic situation.
[ i] Tips
If a fault occurs in the ABS, the EDL is also not functioning. This is
indicated by the ABS warning light=>
page 21. •
Anti-Slip Regulation System (ASR)
The Anti-Slip Regulation System prevents the driven
wheels from spinning when the car is accelerating.
General notes
The Anti-Slip Regulation System (ASR) is integrated in the electronic
stabilization program (ESP). When the vehicle starts up and acceler­
ates, the wheels are prevented from spinning by adjusting the
engine power to match the amount of grip available from the road
surface.
How the system works
ASR performs automatically, i.e. without the driver's intervention.
With the aid of the ABS sensors=>
page 274, ASR monitors the
speed of the driven wheels. If the wheels start to spin, the engine
power is reduced automatically until the tires find enough grip to
lock onto the road surface. The system is active across the entire
speed range.
The ASR works in conjunction with the ABS. If a malfunction should
occur in the ABS, the ASR will also be out of action.
& WARNING
The increased safety afforded by ASR does not mean that you can
take safety risks. Always adapt your driving style to the road
conditions and traffic situation.
[ i] Tips
To ensure that the ASR works properly, all four wheels must be fitted
with identical tires Any differences in rolling radius of the tires can
cause the system to reduce engine power when this is not desired.
See also=>
page 338, "New tires and replacing tires and wheels".
Braking
General information
What affects braking efficiency?
Operating conditions and driving habits
The brakes on today's automobiles are still subject to wear,
depending largely on operating conditions and driving habits=>& .
On vehicles that are either driven mostly in stop-and-go city traffic
or are driven hard, the brake pads should be checked by your autho ­
rized Audi dealer more often than specified in the
Warranty & Main- ~

tenance boo klet. Failure to have your brake pads inspected can
r esult i n reduce d brake pe rfor mance .
On steep slopes , you s hou ld use the braking effect of the engine .
T his way, you prevent unnecessary wear on the bra ke system . If you
must use your brakes, do not hold the brakes down con tinuo usly.
P ump the brakes at intervals.
Moisture or road salt
U nder ce rtain conditions, for example, when driving through water
or very heavy rain, or even after washing your vehicle, the brak ing
effect can be reduced due to moisture (or in freezing conditions ice)
on the b rake pads. A few carefu l brake appl icat io n s sh ould d ry o ff
the brake pads or remove any ice coatings.
Th e eff ectiveness of the b rakes ca n b e re d uce d whe n the ve hicle is
driven on a salt -covered road and the brakes are not used . Here too,
you sh ould clean off acc umulated sa lt coat ing from brake d iscs and
pads with a few careful app lications of the brake~&.
Corrosion
T here may be a tendency for dirt to build up on the brake pads and
co rrosion to form o n the discs if the car is not d rive n regu lar ly or
only for short trips with little use of the brakes .
I f the brakes are not used frequently, or if corrosion has fo rmed on
t he d iscs, i t is a dv isab le to clea n off th e pads an d discs by braking
firmly a few times from a moderate ly high speed~& .
Faults in the brake system
I f you shou ld notice a sudden increase in brake pedal trave l, then
one of the two brak e circu its may have failed~ &.
Low brake fluid level
Ma lfunctions can occur in the brake system if the brake fluid leve l is
t oo low. T he b rake fl uid level is mon ito red e lect ro nica lly .
Controls and equip­ ment Safety first
Vehicle operation
Intelligent technology
Brake lining wear status
Brake l ini ng w ear may be checke d by visua l ins pec tion of the co nd i­
tion of the brake pads throu gh the open ings in the wheel. If neces ­
sa ry, the wheel may be removed for this i nspectio n
~ page 353,
"Changin g a whee l".
& WARNING
• You should perform braking maneuvers for the purpose of
cleaning the brake system only if road conditions permit . Other
road use rs must not be put at r isk -you may cause an accident !
• Before descending a steep grade , reduce speed and shift trans ­
mi ssion into a lower gear or lower driving range . Do not ride the
brakes or hold the pedal down too long or too often . This could
cau se the brakes to get hot and diminish braking efficiency .
• Do not "ride the brakes" by resting your foot on the pedal when
you do not intend to brake. This may cause the brakes to overheat ,
premature wear and increased stopping distance.
• Under certain climati c and operating conditions such as
passing through water , driving in heavy rain or after washing the
vehi cle , the effectiveness of the brakes can be reduced. In winter ,
ice can accumulate on the brake pads , linings , discs and drums .
Carefully apply brakes for a test. Brakes will dry and ice coatings
will be cleaned off after a few careful brake applications .
• Driving for an extended period of time on salt -covered roads
without using your brakes can also affect braking efficiency. Clean off accumulated salt coating from brake disc s and pads with a few
careful brake applications .
• If you damage the front spo iler , or if you install a different
spoiler, be sure the air flow to the front brakes is not obstructed.
Otherwise the brake sy stem could overheat reducing the effective ­
ness of the entire brake system.
• Failure of one brake cir cuit will impair the braking capability
resulting in an increased stopping distance. Avoid driving the
Vehicle care Do-it-yourself service Technical data

until the vehicle has braked to the required speed. The brake assis­
tant switches itself off as soon as you release the brake pedal.
The brake assistant will not be operative if there is a malfunction in
the ABS.
& WARNING
Please remember that the accident risk always increases if you
drive too fast, especially in corners or on a slippery road, or if you
follow the vehicle ahead of you too closely. Increased risk of an
accident cannot be compensated for even by the brake assistant,
so always maintain a safe speed. •
Servotronic® -advanced power
steering system
The power steering systems uses the power of the
running engine to allow precise steering with little effort.
The advanced Servotronic ® power steering system senses the road
speed and electronically adjusts power assistance to provide
comfortable and safe steering response exactly matched to the
vehicle speed.
Power steering will not work if the engine is off. As a result, the
steering whee l wil l be hard to turn.
The power steering fluid level is checked during the scheduled
maintenance services.
0 Note
If there is an electronic malfunction, servotronic will sti ll function
like a conventional power steering system, providing a constant
steering support force that is no longer proportionate to the vehicle
speed. This is most noticeable when turning the steering whee l at
Controls and equip­
ment Safety first Vehicle operation
Intelligent technology
low speeds (for examp
le when parking), -more effort will be
requ ired than usual.
• Be aware of the different than usual steering response and
adjust your steering force accordingly .
• Have the problem checked and set right by an Audi dealer as
soon as possible.
[ i ] Tips
• When the engine is running, never hold the steering whee l
turned all the way to the right or to the left for longer than 15
seconds. The power steering pump will overheat the hydraulic fluid
if you keep holding the steering whee l turned a ll the way. This is
likely to damage the power steering system.
• If the power steering system shou ld fail entire ly, or if the engine
is not running (for examp le, while being towed), you will still be able
to steer the vehicle . However,
considerably more effort will be
required to do so.
• If the power steering system shou ld have a leak, or is not func ­
t ioning properly, contact your authorized Audi dealer immediately.
• The power steering system requires a special ly formulated
hydraulic fluid. The power steering reservoir is the one located most
forward on the left side of the engine compartment=>
page 310. The
correct fluid level in the reservoir is important for proper func­
tioning of the power steering .•
Driving with your q attro®
With All Wheel Drive, all four wheels are driven.
General information
With All Whee l Drive, power is distributed to all four wheels. This
happens automatically depending on your dr iving style and the
road conditions at the time. See also=>
page 271, "Electronic differ ­
entia l lock (EDU".
Vehicle care Do-it-yourself service Technical data

___ ln_ t _e_ ll-'"ig ...,_ e_ n_t _t_ e_ c_ h _ n_o _ l_o _,.g= y,_ __________________________________________ _
This notification reminds you that the starting capability of the
engine may be limited . As soon as you s tart driv ing again, the
battery wi ll be recharged and the notification wi ll go out .
Driver notification appears and goes out again
If this driver notification appears after the ignition is turned on or
wh ile dr iving and i t go es out again after a w hile, the ba ttery has
been adequately recharged .
Driver notification appears and does not go out again
If this driver notification appears after the ignition is turned on or
w hile driving and d oes not go out aga in, the batte ry's s tate of
charge is not in the optimal range . Starting abi lity is restricted . Have
t he battery checke d as soon as p ossi ble at a deale rship .•

_____________________________________________ C_ l_ e _a_ n_ in_ g_a _ n_d_ p_ r_ o_ t _e_ c_t _io _ n __ _
•
prevent it from fading. Slight color variations will develop in normal
use and are not an indication of material deterioration.
0 Note
• Never use chemical solvents (e.g. lighter fluid, turpentine),
waxes, shoe polish or similar products on Alcantara ® surfaces.
• To avoid damage, have stubborn stains removed by a commer­
cial cleaning specialist.
• Do not use brushes, stiff sponges or similarly abrasive cleaning
aids .•
Safety belts
Only well-maintained safety belts work reliably when
needed.
- Keep belts clean.
- For cleaning, use a mild soap and water solution . Let
belts dry thoroughly and away from direct sunlight .
- Do not allow inertia reel safety belts to retract before
they are completely dry.
- Check the condition of your safety belts
regularly.
Heavily soiled safety belts may not retract properly.
& WARNING
Damaged safety belts can break in a crash.
• Anything that might damage your safety belts could mean that
you and your passengers would not be adequately protected in an
accident.
• Safety belt performance depends on correct installation. Never
remove belts from the vehicle to clean them.
& WARNING (continued)
• Do not use chemical cleaning agents, bleach or dyes. They have
corrosive properties which weaken the webbing.
• When cleaning your safety belts, inspect them for damage. If
you discover damage, see your Audi dealer.
• Always read and heed all WARNINGS and other information
~ page290. a
Engine compartment
Be especially careful when cleaning the engine compart­
ment.
Always switch off the ignition before cleaning the engine ~ &.
Plenum panel
Remove leaves from the plenum panel in front of the windshield
under the engine hood. This prevents the water drain holes from
becoming blocked, and it prevents debris from entering the vehicle
interior through the heating and ventilation ducts.
Corrosion protection
The engine compartment and transmission have been corrosion­
protected at the factory.
Good anti -corrosion treatment is very important, particularly in the
winter. If the vehicle is frequently driven on salt treated roads, the
entire engine compartment and plenum panel should be thor­
oughly cleaned at the end of winter and retreated to prevent salt
damage. At the same time, the underside of the vehicle should be
washed as well.
If the engine compartment is cleaned at any time with grease
removing solutions
2 l, or if you have the engine washed, the anti­
corrosion treatment is almost always removed as well. It is therefore .,_
21 Use only th e correct cleaning solut ions. N ev er us e gasolin e or di ese l fu el.
Vehicle care I t •

lffl __ C _h_ e_ c_k _in --== g'-- a_n _d_ f_il _li _n ..:::g:::..- ___________________________________________ _
Checking and filling
Engine hood
Releasing the engine hood
The engine hood is released from inside the vehicle.
Fig. 261 Driver's side
footwell: engine hood
release lever
-Pull the release lever on the left under the instrument
panel ~ fig. 261 in the direct ion of the arrow.
Th e hood pops up slightly under spring pressure .•
Opening the engine hood
Fig . 262 Release lever
under the engine hood
Before opening the engine hood, make sure that the wind­
shield wipers are flat against the windshield. Otherwise,
they could damage the paint on the hood.
Lift the hood slightly ~&, .
- Pull up on the release under the hood ~ fig. 262. This
releases the catch.
- Open the hood all the way.
The hood is kept in the open position by two gas struts.
& WARNING
Hot engine coolant can burn you.
• To reduce the risk of being burned, never open the hood if you
see or hear steam or coolant escaping from the engine compart­
ment. Wait until no steam or coolant can be seen or heard before
carefully opening the hood. •