2008 AUDI S6 check engine light

___ C_h_ e_ c_k _in --== g'-- a_n _d_ f_il _li _n ..:::g:::..- ___________________________________________ _
le as t 50% b ut not mor e th an 60 % to maintain antifreeze protection
and cooling efficiency . If the coo lant frost protection is too low, the
coo lant could freeze and damage the vehicle heating and engine
cooling system.
For year -round driving, antifreeze is added at the factory for temper­
atures down to:
• -31 °F ( -35 °C) USA
• -40 °F ( -40 °C) Canada.
You can m ix the
Gl 2 + coolant additive with other add itives (for
example
Gl 1 or Gl 2). A lways check with your authorized Audi
dea ler .
& WARNING
Before you check anyt hing in the engine comp artment , alw ays
re ad and heed all WARNINGS ~
& in "Working in the eng ine
co mpar tm ent " o n
pag e 297.
0 Note
• Before win ter sets in, have the coolant checked to see if the
coolant additive in your vehicle is sufficient to meet the climate
conditions. This is especia lly important if you live in a region where
the winter is extremely cold. I f necessary, increase the proportion of
coo lant additive to 60%.
• When adding coolant additive to your coo ling system,
remember:
-We recommend using only coolant additive
Gl 2+ (check the
label) for your vehicle. This coolant addit ive is available at autho ­
rized Audi dealers. Other types of antifreeze can significantly
reduce corrosion protect ion . T he resulting corrosion can cause a
loss of coolant and serious engine damage.
• Do not add any type of radiator leak sealant to your vehicle's
engine coolant. Adding radiator repair fluid may adversely affect the function and performance of your cooling system and cou
ld result
in damage not c overed by your New Vehicle Limited Warranty. •
Checking the engine coolant level
The engine coolant level can be checked with a quick
glance.
F ig . 235 Eng ine
c o mpartm ent : Cool ant
ex pa nsion tank
Before you check anything in the engine compartment,
always read and heed all WARNINGS~
& in "Working in
the e ngin e compa rtment" on
page 297 .
Turn off the ignition.
Re ad the en gine coo lant leve l from the coo lant exp an­
sio n ta n k~ fig. 235. With a cold eng ine, the coolan t leve l
sho uld be between the "m in" and "max" markings. W hen
t h e eng ine is warm, the level may be s lightly abov e the
"max" marking .
The location of the coolant expansion tank can be seen in the
engine compartment illustration~
page 298.
To obtain an accurate reading, the engine must be switched off .
T he expansion tank in your vehicle is equipped with an e lectric
coo lant leve l sensor.

_____________________________________________ C_h_ e_ c_k _in ~ g_ a_n _d_ f_il _li _n ~g __ _
•
When the coolant level is too low , the warning light in the Auto­
Check System =>
page 33will blink un til you add coo lant and the
level has been restored to normal. Even though there is an electric
coolant leve l sensor, we still recommend you check the coo lant level
from time to time .
Coola nt lo ss
Coolant loss may indicate a leak in the cooling system . In the event
of coolant loss, the coo ling sys tem should be inspected immedi ­
ately by your authorized Audi dealer . It is not enough merely to add
coolant.
In a
s ealed system, losses can occur only if the boiling po int of the
coolant is exceeded as a result of overheating.
0 Note
Do not add any type of radiator leak sea lant to your vehicle's engine
coolant . Adding radiator repair fluid may adversely affect the func ­
tion and performance of your cooling system and could resu lt in
damage not covered by your New Vehic le Limited War ranty .•
Adding coolant
Be very careful when adding engine coolant.
Before you check anything in the engine compartment,
always read and heed all WARNINGS => & in "Working in
the engine compartment" on
page 297 .
- Tu rn off the engine .
- L et the engine coo l dow n.
- Place a t hick rag over the coolant expansion tank
=> page 304, fig . 235 and carefully tw ist t he cap counter­
cloc kw ise
=> & .
- Add coolant. - Twist the cap
on agai n
tightly.
Replacement engine coolant must conform to exact specifications
=>
page 303, "Coolant". If in an emergency coolant additive G12 + is
not avai lable, do
not use a different additive . Use p lain water
instead until you can get the correct additive and can restore the
correct ratio . This should be do ne as soon as possible.
If you have lost a considerable amount of coolant, then you should
add cold antifreeze and cold water only when the engine is cold .
Always use
new engine coolant when refilling .
Do not fil l coolant above the "MAX" mark. Excess coolant will be
forced out through the pressure relief va lve in the cap when the
engine becomes ho t.
& WARNING
• The cooling system is under pressure and can get ver y hot.
Redu ce the risk of sc alding from hot coolan t by follow ing the se
s tep s.
- Turn off th e en gine and allo w it to cool down .
- Protect your fa ce , ha nd s and arm s from e sc a pi ng fluid and
s tea m by cov ering the c ap with a large , thick rag.
- Tur n the cap slo wly an d very ca refully in a counter -clockw is e
dire ction whil e applying light , downward pres sure on the top
o f the cap.
- To av oid bei ng burn ed , do n ot spill antifree ze or cool ant on
the e xhau st sy stem or h ot e ngi ne part s. Under cert ain co ndi­
tion s, the ethylen e gl ycol in engin e co olant c an c atch fire .
• Antifr eeze is po iso nous. Alwa ys store antifree ze in its or igin al
c ontainer and well out of the reach of c hildren .
• If you dra in t he coola nt, it mu st b e ca ught and sa fel y stor ed in
a prop er container clearly mark ed "poi son ".
~
Vehicle care I t •

•---=C:.:h..:. e=-= c..:.k :..:.in :..:.:= g:.....= a..:.n :.:d::....:. f.:.:il .:.:li ..:.n :..::g~ --------------------------------------------
0 Not e
• Coolant pollutes the environment and cou ld cause an engine
fire. Excess coolant will be forced out through the pressure relief
valve in the cap when the engine becomes hot.
• If, in an emergency, only water can be added, the correct ratio
between water and antifreeze ~
page 303 must be restored as soon
as possible .
ci> For the sake of the environment
Dra ined coolant should not be reused . Always dispose of used
coolant whi le observing all environmental regulations. •
Radiator fan
The radiator fan switches on automatically by itself.
The rad iator fan is driven by the eng ine v ia the V-be lt . The v iscous
clutch regulates the speed of the fan according to the tempera ture
of the coo lant .
An auxiliary electric radiator fan * swi tches on and off depending on
coo lant temperature and other vehicle operating conditions.
After you switch the engine off, the auxiliary fan can continue running for up to 10 minut es -even with th e igni tion o ff. It can even
switch o n again later by itself~ & , if
• the temperature of the engine coo lant rises due to the heat
bui ld -up from the engine in the engine compartment, o r
• the engine compartment heats up because the vehic le is parked
in intense sun light.
& WARNING
• To reduce the ri sk of per sonal injury never tou ch the radiator
f a n.
& W AR N ING (continu ed )
• The auxiliary e le ctri c fan i s temperature controlled and can
s w itch on suddenly even when the engine is not running .
• The auxiliary radiator fan swit ches on automatically when the
engine coolant reache s a ce rtain temperature and will con tinue to
run until the coolant t emperatur e drop s. •
Brake fluid
Checking brake fluid level
Th e brake fluid level c an be checked with a quick glance.
Fig . 23 6 En gin e
co mp art m ent : B ra ke
fl uid re servoir
Befo re yo u c heck anything in th e en gin e compar tme nt,
always read and heed all WARNINGS~ & in "Working in
the eng ine compartment" on
page 297 .
Rea d the brake fl uid level from the bra ke fluid reservoir
~ fig . 236. T he b rake fluid leve l must be betwee n the
" M IN " and "MAX" markings.
The brake fluid reservoir is located at the rear parti tion of the engine
compartment on the left side~
page 298. .,_

lffl __ C _h_ e_ c_k _in --== g'-- a_n _d_ f_il _li _n ..:::g:::..- ___________________________________________ _
With certain types of airbag deployment, the battery is discon­
nected from the vehicle electrical system for safety reasons=>&. in
"Repair, care and disposal of the airbags" on
page 226.
Di sc o nnect ing the b attery t ermin als
Some vehic le functions (power window regulators, for example) are
lost if the battery terminals are disconnected. These func tions have
to be relearned after the battery terminals are connected again . To
prevent this, the battery should only be disconnected from the
vehic le electrical system when absolute ly necessary for repairs.
V ehicle s not driven for long period s
If you do not drive your vehicle over a period of several days or
weeks, electrical components are gradually cut back or switched off .
This reduces energy consumption and maintains starting capability
over a longer period =>
page 265.
Take into consideration that when you un lock your vehicle, some
convenience functions, such as the master key remote function or
power seat adjustment, may not be available. The convenience
functions will be availab le again when you turn on the ignition and
start the engine .
Winter oper ation
During the w inter months, battery capacity tends to decrease as
temperatures drop. This is because more power is also consumed
while s tarti ng, an d the headlights, rear wi ndow defogger, etc ., are
used more often.
Avoid unnecessary p ow er consumption, particularly in ci ty traffic or
when trave ling only short distances. Let your authorized Audi dea ler
check the capacity of the vehicle battery before winter sets in
=> page 310. A we ll charged battery wil l not on ly prevent starting
problems when the weather is cold, but wi ll also last longer.
[ i J Tips
If your vehicle is left standing for severa l weeks at extremely low
t empera tures, the vehicle ba ttery should be r emoved and stored where it will not freeze
. This will prevent it from being damaged and
having to be replaced .•
Working on the battery
B e espec ially caref ul when working on or near the battery.
Fi g. 23 7 Lugg age
compartm ent : B attery
The battery is located in the luggage compartment under
the floor. Before you check a nything in the l uggage
com partme nt,
read and heed all WARNINGS=>& .
-Lift the floor by the plastic handle.
Hook t he hand le in to the luggage compartment weather
st rip.
Always heed the safety warnings , when working on the vehicle
ba ttery or the vehicle e lectrical system to prevent injury.

Checking and filling 111111
---------------------------=----
•
The following WARNINGS are very important when
working on the battery:
Always heed the following WARNING SYMBOLS and safety pre­
cautions when working on the battery .
Always wear eye protection.
Battery acid contains sulfuric acid. Always wear
gloves and eye protection.
No
- sparks
- flames
- smoking.
When a battery is charged, it produces hydrogen
gas which is explosive and could cause personal
injury.
Always keep the battery well out of reach of chil ­
dren.
& WARNING
Whenever working on the battery or on the electrical system,
there is the risk of injury, accident and even fire. Read and heed the
following WARNINGS:
• Always wear eye protection. Do not let battery acid or any lead
particles get on your skin or clothing. Shield your eyes. Explosive
gases can cause blindness or other injury.
• Battery acid contains sulfuric acid. Sulfuric acid can cause
blindness and severe burns.
- Always wear gloves and eye protection. Do not tilt the
battery because acid could leak out of the ventilation openings.
- If you get battery acid in your eyes or on your skin, immedi­
ately rinse with cold water for several minutes and get medical
attention.
& WARNING (continued)
-If you should ingest any battery acid, seek medical attention
immediately.
• Do not expose the battery to an open flame, electric sparks or
an open light.
• Do not smoke.
• Do not interchange the positive and negative cables .
• When working on the battery, be sure not to short -circuit the
terminals with tools or other metal objects. This would cause the battery to heat up very quickly, which could lead to damage or
explosion and personal injury.
• When a battery is charged, it produces hydrogen gas which is
explosive and could cause personal injury.
• Always keep the battery well out of the reach of children.
• Before work is done on the electrical system, disconnect the
negative ground cable.
• Before performing any work on the electrical system, switch off
the engine and ignition as well as any electrical equipment. The
negative cable on the battery must be disconnected.
If you are just
going to replace a light bulb, then it is enough to switch off the
lights.
• Before disconnecting the battery, switch off the anti-theft
alarm system! Otherwise you will set off the alarm.
• When disconnecting the battery, first disconnect the negative
cable and then the positive cable.
• Before reconnecting the battery, make sure all electrical
consumers are switched off. Reconnect the positive cable first and
then the negative cable . Never interchange the cables - this could
start a fire!
• Never charge a frozen or a thawed-out battery. It could
explode! If a battery has frozen, then it must be replaced. A
discharged battery can freeze over at 32 °F (0 °CI. .,,_
Vehicle care
I t •

llffl __ A_ l..:,. p _ h_ a_ b_e _t_ic _ a_l _in _ d_e_ x ____________________________________________ _
Brake system . . . . . . . . . . . . . . . . . . . . . . . 306
Anti-lock brake system . . . . . . . . . . . . . 22
Brake fluid . . . . . . . . . . . . . . . . . . . . . . 306
Brake fluid specifications for refill and replacement . . . . . . . . . . . . . . . . . . . 307
Brake pads . . . . . . . . . . . . . . . . . . . . . . 268
Electromechanical parking brake ... 129
General information .............. 261
How does moisture or road salt affect the brakes? ....................... 261
Malfunction ........ ... ...... .... . 32
Warning/indicator lights ........... 23
Worn brake pads symbol . . . . . . . . . . . 37
Break -in period . . . . . . . . . . . . . . . . . . . . . 267
Brake pads . . . . . . . . . . . . . . . . . . . . . . 268
Tires .... ... .. .... .... .......... 267
Bu lbs ... .... .. ... ...... ....... .... 349
Bumper cover Caution when parking near a parking bar -
rier or curb ...... ... .... .... ... 130
C
Ca lifornia Proposition 65 Warning 298
Battery specific . . . . . . . . . . . . . . . . . . 310
Capacities ......................... 363
Car care ................. .... .... .. 278
Interior .......... .... .... ...... . 285
Plastic and vinyl .. .... ........... 282
Weatherstrips ....... ........ .... 283
Care of exterior .... ....... .......... 278
Cargo area
See Loading the luggage compartment ..
199 Cargo net
.... .... ... ........ ...... .. 98
Catalytic converter . ........ .... .... . 268
CD changer . . . . . . . . . . . . . . . . . . . . . . . . 107
Central locking Emergency locking . . . . . . . . . . . . . . . . 57
Changing a flat tire ........ .... ... ... 338
Changing a wheel .... .. ..... .. .. .... 338
Changing engine oi l ....... .... ... ... 302
Chassis Undercoating ... .. .... .... .... ... 284
See also Adaptive Aar Suspension . . . 182
CHECK button . . . . . . . . . . . . . . . . . . . . . . . 16
Checking Engine coolant level .............. 304
Checking tire pressure .. ........... .. 319
Child restraints Danger of using child restraints in the front seat ......... ... .... ...... 214
What types of chi ld restraint anchors are
available? . .... ..... ...... .... .. 247
Where can I get additional information
about child restraints? ...... ... .. 248
Child safety ...... ...... .... ... . 234, 239
Additional information ............ 253
Booster seats ................. ... 242
Convertible chi ld safety seats .. .... 240
Convertible locking retractor ....... 244
Guidance fixtures for lower anchorages
250
Important safety instructions for using
child safety seats .... ...... ... .. 237
Important things to know when driving with children ................... 234 Infant
seats ... .... .... ....... .. . 239
Install ing a child restraint using the
LATCH system .. ...... ..... .. ... 252
Lower anchorages ... .. .... .... ... 249
Mounting and releasing the anchorage
hook . ............ ....... .... .. 253
Older children and safety belts ..... 243
Safety belts and older children ..... 243
Tether anchors .. ...... .... ...... 253
Tether strap ... .... .... ...... .... 254
Which restraint system should my older
chi ld wear? ....... ........... .. 243
Child safety lock
rear doors {power) . .... ........ .... 59
Child safety seats .. .... ...... .... ... 239
Convertible locking retractor .. ..... 244
Danger of using child restraints in the
front seat ...................... 214
How do I properly install a child safety
seat in my vehicle? .... ... .... ... 237
Installing .. .. .. .... .... ... .... ... 244
LATCH system ....... ........ .... 252
Safety instructions ............... 237
Cigarette I ig hter . . . . . . . . . . . . . . . . . . . . 105
Cleaning Alcantara {synthetic suede) . ....... 288
Engine compartment ...... .... ... 289
Fabrics and fabric coverings . ...... 285
Instrument panel ....... ........ .. 286
Interior ........... .... .......... 285
Leather ... .... .................. 287
MMI display .............. .... ... 285
MMI terminal .. .... .... ... .... ... 285
Plastic and vinyl ... .... .... .... ... 282

llffl __ A_l.:,. p _h_ a_ b_e _t _ic _ a_l _in _ d_e _x ____________________________________________ _
Driver seat
See Seating position . . . . . . . . . . . . . . 194
Driver's seat . . . . . . . . . . . . . . . . . . . . . . . . 88
Driver's seat memory . . . . . . . . . . . . . . . . . 91
Activating remote control key .. ... .. 92
Recalling a seat posit ion ...... .... . 91
Storing a seat position . ........ .... 91
Driving messages ...... .... .... .... .. 30
Driving safely .... .... .... ...... .... 192
Driving time . ...... .. .... .... .... .... 40
Dup licate key ........... .... ... .... .. 48
DVD player for navigation system . . . . . . 99
Dynamic shift program .............. 163
E
Easy entry feature 124
Electric seat adjustment
S ee Power seat . . . . . . . . . . . . . . . . . . . 88
Electromechanica l parking brake
Emergency braking .. ...... ...... . 131
Malfunction ...... .... .... ....... 131
Operation . . . . . . . . . . . . . . . . . . . . . . . 129
Parking . . . . . . . . . . . . . . . . . . . . . . . . . 130
Rel easing and app lying .... ... .... 129
Starting off with a trailer ... ..... .. 131
Warning /indicator ligh ts ... .... .... 23
Electronic differential lock (EDU
How the system works . . . . . . . . . . . . 259
Warning /indicator lights ....... .... 22
Electronic immobilizer . ... .... .. . .. 15, 51
Electronic power contro l
(EPC) warning/indicator light ...... .. 19 Electronic stabili
zation program (ESP)
How the system works . ...... ..... 258
Wa rning/indicator lights ......... .. 19
Emergency braking . . . . . . . . . . . . . . . . . 131
Emergency closing Power sunroof ......... .... ... . 68, 69
Emergency flasher . . . . . . . . . . . . . . . . . . . 73
Wa rning/indicator lights ..... ...... 20
Emergency locking of doors ....... ... . 57
Emergency starting .. ... .... .... .... 351
Emergency towing ..... .... .... ... .. 354
Energy management ... .. .... .... ... 265
Battery power . . . . . . . . . . . . . . . . . . . 266
Driver notification 266
Engine Compartment . .... .... .... .... .. 298
Coolant ......................... 303
Hood ... .. .... .... .... .... .... .. 296
Starting ...... ........ .... .. 124, 125
Starting with jumper cables .. ..... 351
Stopping ........................ 126
Engine compartment Safety instructions .... ...... ..... 297
Working the engine compartment .. 297
Engine coolant system ........ .... ... 303
Adding coolan t ..... ........ .... . 305
Checking coo lant level .. ....... ... 304
Check ing the engine coolant level .. 304
Malfunction ......... .... .. .. .... . 33
Radiator fan ...... .. .. .... .... ... 306
Engine coolant temper .ature
Temperature gauge ...... ...... ... 13
Engine data .. ... ... .. .... .... ...... 363 Engine hood
Clos ing ... .... ... ... ... .. .... ... 297
How to release the hood . . . . . . . . . . 296
Engine oi l ..... ... .... .... .. .. ..... . 299
Adding ... .... .... .... .... ... ... 302
Additiv es .. ...... ..... .. .. .... ... 302
Changing . ....... .... ... .. ...... 302
Checking the engine oil level . .... .. 301
Indications and conditions requiring extra
checking .. ...... .... .......... 301
Oil consumption ... .... .... .... .. 300
Oil grades . ...... ... ... .... ..... . 299
Recommended oil che ck in tervals .. 301
Specif ication and viscosity .. .. .. ... 299
Engine oil leve l ... .... .... .. .. ..... .. 37
Engine oil pressure Malfunction .. .. .. .... .... .... .... 34
Eng ine oi l sensor defective .... .... .... 37
Environment Break -in period ........ ..... ..... 267
Catalytic converter .... .... ..... .. 268
Disposing of your vehicle battery .. . 311
Driving a t high speeds ............ 269
Driv ing to minimize pollution and noise .
269
Fuel .... .. .... .... .............. 293
Fuel economy ...... .... .. .. .... .. 269
Leaks under your vehicle ....... ... 297
Letting the vehicle stand and warm up ..
270
Proper disposal of drained brake fluid 307
P roper disposal o f drained engine
coo lant ..... .. .. .... .... ....... 305

______________________________________________ A_ l:.!: p :...:h..:. a= b..:e :...: t:..:..i c.::....:.: a..:..l ..:.in :....:..:: d:.:e :.: x-=---"'
Leather . .... ....... ... . .... .. .. .... 286
Cleaning . .... .... ....... ........ 287
Leve l adjustment
See Adaptive Air Suspension . .... .. 182
Lifting jack . .... ........ ... .... .... . 341
Lifting vehicle ...................... 356
Light Exterior lighting in the mirror housing 73
leaving home ...... ..... .... .... .. 73
Light sensor defective ... .... ... .... .. 36
Lighting in the mirror housing ......... 73
Lights ........ .... .... .... ...... .... 70
Coming home ... .... .... .......... 71
Daytime running lights . .... .... .... 71
Emergency flashers . ... .. .... .... .. 73
Exterior lights . .... .... ... .... .... . 71
Front fog lights ...... .... ..... .. ..
72
Headlights .. ... ... .. .... .... .... . 70
High beam .................... 70, 74
High beam warning/indicator light . .. 22
Leaving home .... .... .... .... ..... 71
Rear fog lights ... .... .... .... .... . 72
Side marker lights .. ...... ...... ... 70
Turn signals .... .... .... .... .... .. 74
Xenon headlights ... ..... .. .. .... .. 70
Loading the luggage compartment .... 199
Loading the roof rack .... ....... .... . 102
Lockable backrest .... ....... .... .... . 96
Locking Power locking switch .... .... .... .. 56
Rear lid/trunk lid .................. 58
Remote control key .......... .... .. 54
Using the key .... .... ... ....... ... 55
Controls and equip­
ment Safety first
Lower anchorage locator button
..... .. 249
Lower universa l anchorage bars (Canada) ..
249
Lower universal anchorages (Canada) .. 249
Luggage Stowing . .... ....... .... .... .... . 199
Luggage compartment ................ 96
Cargo net .... .... ...... ........ .. 98
DVD player for navigation system ... . 99
Expanding .... .... .... .... .... ... . 96
Fastening eyelets ... .... ....... .... 97
Side Compartment .. ....... .... ... 99
Ski sack . .... ....... .. .. .... .... . 100
See also Loading the luggage
compartment ..... .. ... ... .. .... 199
Lumbar support .... ....... .... .... ... 90
M
Maintenance ... ....... .... .... .... . 366
Malfunction Indicator Lamp (MIU .. .. 20, 29
Master key ... ........... ....... .... . 49
Battery replacemen t .. .... .... .. 49, 50
Check light ..... ........... .... ... 49
Mi leage
Average .. ..... ... .... .... .... ... . 40
Instantaneous ... ...... ... .. .... .. 40
Mirrors Activating the digital compass .... ... 85
Adjusting the anti -glare . .... ..... .. 82
Automatic dimming for the outside mirrors . .... .... .... ........ ... . 84
Automatically dimming inside mirror . 82
Inside day -night m irror .... .... .... . 82 Interior mirror
... .. .... .... ..... .. . 82
Outside mirrors ... .... .... .... .... 83
Recalling position of outside mirrors . 91
Storing position of outside mirrors . .. 91
Monitoring the Advanced Airbag System ..
223
multitronic® ........................ 159
Automatic Shift Lock (ASU ....... .. 162
Driving the multitronic® ... .... .... 160
Dynamic shift program .... .... .... 163
Fail-safe mode .... .... ... .... .... 165
Kick-down ....................... 163
Manual shift program ... .... .... .. 164
Se lector lever ... ... .. .... .... .... 161
Steering wheel with tiptronic® .... . 165
tiptronic .... .... .... .... .... ..... 164
N
Natural leather .... .... ... .. .... .... . 286
New tires and wheels . .... ..... ...... 325
NHTSA Contacting ..... .. ... ... .... .... . 201
Number of seats ...... ... .. .... .... . 202
0
Occupant seating positions .. ... .. .... 194
Octane rating .... .... .... .... ... .... 291
Odometer ... .... .... .... ... .... .... . 15
Oil
See Engine oil ... ...... .. . ... ..... 299
Older children and safety belts .... .... 243
Vehicle operation Vehicle care Do-it-yourself service Technical data