2015 AUDI A8 check engine

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Spare wheel
Applies to vehicles: with spare wheel
The spare wheel is stored in the wheel well
underneath the floor panel in the luggage
compartment.
F ig. 220 Luggag e co mpartm ent : spar e wh eel
Taking out the sp are whee l
• Lift the cargo floor by the plast ic handle
c:::>fig . 220.
• Hook the hand le into the luggage compart­
ment weather strip .
• Turn the large screw
c:::> fig. 220 counter­
clockwise.
• Takeout the spare tire.
• Always store the vehicle tool kit , the jack*
and the replaced tire in the luggage com­
partment
c:::> page 139 .
• Unhook the ca rgo floor before closing the
rear lid.
& WARNING
-
Loose items in the passenger compart­
ment can cause serious pe rsonal in jury
during hard braking or in an accident.
- Never store the spare wheel or jack and
tools in the passenger compartment.
@ Tips
Check the inflat ion p ressu re of the spare
tire periodically to keep the tire ready for
use.
What do I d o now ? 269
Changing a wheel
Before changing a wheel
Observe the following precautions for your
own and your passenger's safety when chang ­
ing a wheel.
• After you experience a t ire failure, pull the
car well away from moving traffic and try to
reach
leve l ground before you stop c:::> ,&.
• All passengers should le av e t he ca r and
move to a safe location (for ins tance, behind
t he guardra il)
c:::> ,& .
• Engage the parki ng br ake to prevent your
vehicle from rolling unintentionally
c:::> ,& .
• Move sele ctor lever to po sit ion P c:::> ,&. .
• If you are towing a trailer, unhitch the trailer
from your ve hicle.
• Take the
jac k and the sp are tire out of the
luggage compartment
c:::> page 267,
c:::> page 268 .
& WARNING
You o r you r passengers could be i njured
while changing a wheel if you do not fo l­
low these safety precaut ions:
-I f you have a flat tire, move a safe d is­
tance off the road. Turn off the engine,
turn the eme rgency flashers on and use
other warning devices to a lert other mo­
torists .
- Make sure that passengers wait in a safe
place away from the vehicle and well
away from the road and traffic.
- To help prevent the vehicle from moving
suddenly and possibly slipping off the
jack, always f ully set the parking brake
and b lock the wheel d iagonally opposite
the wheel be ing changed. When one
front wheel is lifted off the ground, plac­ ing the Automatic Transmission in "P"
(Par k) will
not prevent the vehicle from
mov ing .
- Before you change a wheel, be sure the
ground is level and firm. If necessary,
use a sturdy board under the jac k.
-

-When connecting jumper cables, make
sure that they cannot get caught in any
moving parts in the eng ine compart­
ment .
- Before you check anything in the engine
compartment, always read and heed all
WARNINGS ¢
page 228.
(D Note
Improper hook-up of jumper cables can r u­
in the generator.
- Always connect POSITIVE( +) to POSI­
TIVE(+), and NEGATIVE(-) to NEGATIVE
( - ) gro und post of the battery manager
control unit .
- Check that all screw plugs on the battery
cells a re screwed in firmly . If not, tighten
pl ugs p rior to connecting clamp on nega ­
tive battery term inal.
- Please note that the procedure f or con­
nect ing a jump er cable as desc ribed
above appl ies spec ifically to the case of
you r vehi cle be ing jump started. When
you are giv ing a jump star t to an othe r ve­
hi cle, do
not connec t the negat ive (-) ca­
ble to the negat ive (-) terminal on the
discharged battery @¢
fig. 236. In ­
stead, securely connect the negative( -)
cable to e ithe r a solid metal component
that is firmly bolted to the engine block
or to the e ng ine block itse lf. If the bat­
te ry tha t is being charged does not vent
to the outside, escaping batte ry gas
could igni te and exp lode!
Emergency towing
with commercial tow truck
General hints
Your Audi requires special handling for tow ­
tng.
The follow ing information is to be used by
commercia l tow tr uck operators who know
h ow to ope rate thei r equipme nt safe ly.
Emergenc y situ ation s 283
-Ne ver tow your Audi. Towing will cause
damage to the engine and tran smission.
- Never wrap the safety chain s or w inch ca­
ble s around the brake lines.
- To prevent unnece ssary damage , your Audi
must be transported with a flat bed tru ck.
- To load the vehicle on to the fl at bed , use
the towing loop found in the vehicle tools
a nd attach to the front or rear anchora ge
¢ page 283 and ¢ page 284 .
_& WARNING
A vehicle being towed is not safe for pas ­
sengers. Never allow anyo ne to ride in a
vehicle be ing towed, for any reason.
Front towing loop
Only install the front towing loop when it is
needed.
Fig. 237 Fr ont bu mpe r: cove r
Fig. 238 Fr ont bu mpe r: sc rew ing in t he tow ing loop
-
The towing loop f its into the threaded hole lo ­
cated on the right s ide of the front bumpe r
and cove red by a sma ll cove r when not in use .
.. Remove the tow ing loop from the vehicle
too l kit .

286 Emergency situations
- When removing heavy components like
these, ancho r vehicle to ho ist o r add cor­
responding weig hts to ma inta in the cen ­
ter of g ravity. Othe rwise, the vehicle
m ight tilt o r slip off t he hoist, causi ng
serious p erson al inju ry .
@ Note
- Be awa re of the following points befo re
li fting the vehicle:
- The vehicle should never be lifted or
jacked up from underneath the engine
oil pan, the transmission housing , the
front or rear axle or the body side membe rs. This could lead to serious
damage.
- To avoid damage to the underbody or
chassis frame, a rubber pad must be
inserted between the floor jack and
the lift points.
- Before driving over a workshop hoist,
check that the veh icle weight does not
exceed the permissible lifting capacity
of the hoist .
-Before driving over a workshop hoist,
ensure that there is sufficient clear­
ance between the hoist and low parts
of the vehicle.

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complexity of today's automobi les, have
steadi ly reduced the scope of maintenance
and repairs which can be carried out by vehicle
owners.
Also, safe ty and e nvir onm en tal con­
cerns p lace very strict limits on the na ture of
repairs and adjustments to engine and trans ­
miss io n pa rts which an owner can perform .
Maintenance, adjustments and repa irs u sua lly
require special tools, testing dev ices and oth­
er equipment avai lab le to specially trained
workshop personnel in order to assure prope r
performance, reliab ility and safety of the vehi­
cle and its many systems .
Improper ma intenance, adjustments and re ­
pa irs can impair the operation and reliability
of your vehicle and even void your vehicle war­ ranty. The refo re , proof of servici ng in accord­
ance w ith the maintenance sched ule may be a
condition for upholding a poss ible war ranty
cla im made within the warranty period.
Above all, operational safety can be adversely
affected, crea ting unnecessary risks for you
and your passengers.
If in doubt about any servicing, have it done
by your authorized Audi dealer or any other
properly equipped and q ualified workshop .
We strong ly urge you to give you r a uthorized
Audi dealer the opportun ity to perform all
schedu led maint enance and necessary repairs .
Your dea ler has the facilities, or iginal parts
and t rained spec ialists to keep your vehicle
running properly .
Performing limit ed m aintenance you rself
The following pages describe a limited num­
ber of procedur es which can be performed on
your vehicle with ordinary too ls, should the
need arise and trained personnel be unavaila­
b le. Before performing any of these proce­
dures, always thoroughly read all of the app li­
cable text and carefully follow the instruc­
tions given . Always rigorously obse rve the
WARNINGS provided .
Before you check anything in th e engine
compartment, a lway s re ad and heed all
Con sumer In formation 29 1
WARNINGS ¢ & and¢ & in Working in the
engine comportment on page 228 .
A WARNING
-Ser ious personal injury may occur as a re­
sult of improperly performed mainte­ nance, adjustments or repa irs.
-Always be extremely careful when work­ ing on the vehicle. Always follow com­
mon ly accepted safety pract ices and gen­
eral common sense . Never r isk personal
lnJU ry .
- Do not attempt any of the ma intenance ,
checks or repairs descr ibed on the fol­
lowing pages if you are not fully fam iliar
with these or othe r procedures with re­
spect to t he veh icle, or are uncerta in how
to p roceed .
- Do not do any work without the proper
too ls and equipment. Have the necessary
work done by your authorized A udi deal ­
er or another proper ly equipped and
qualified workshop .
- The engine compartment o f any motor
veh icle is a potentially hazardous area.
Never reach into the area around or
touch the rad iator fan. It is temperature
contro lled and can switch on suddenly -
even when the engine is
off . The radiator
fan switches on automat ically when the
coo lant reaches a certain temperature
and will cont inue to run until the coo lan t
tempera ture drops.
- Always sw itch
off the ignition before any­
one gets under the vehicle.
- Always support your veh icle with safety
stands if it is necessary to work under­ neath the vehicle . The j ack supplied with
the vehicle is not adequate for this pur­
pose and cou ld collapse causing serio us
personal injury .
- I f you must work unde rneath the vehicle
with the wheels on the ground , a lways
make sure the vehicle is on leve l ground,
that the wheels are a lways securely
blocked and that the engine cannot be
started.
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29 2 Con sum er Inf ormation
-Always make sure the transmission se­
lector lever (automatic transmiss ion) is
in "P" (Park position) and the park brake
is applied .
@) For the sake of the environment
-Changing the engine settings wi ll ad­
versely affect em iss ion levels. This is det­
rimental to the environment and increas­
es fuel consumption .
- Always observe env ironmental regula­
tions when dispos ing of old engine oil,
used brake fluid, dirty engine coolant,
spent batteries or worn o ut tires.
- Undeployed airbag modules and preten­
s ioners might be classified as Perchlo ­
rate Material -spec ial handling may ap­
ply, see www.dtsc.ca .gov/hazardous­
was te/perch lorate . When the veh icle or
parts of the res traint system including
airbag modules safety belts wit h preten ­
sioners are scrapped, all applicable laws
and regulations must be observed. Your
authori zed Aud i dea ler is familiar with
these requirements and we recommend
that you have your dealer perform this
serv ice for you .
Additional accessories,
modifications and
parts replacement
Additional accessories and parts
replacement
Always consult an authorized Audi dealer be­
fore purchasing accessories.
Your veh icle incorporates the latest safety de­
sig n featu res ensu ring a high standard of a c­
tive and passive safety .
This safety could be comp romised by non-ap­
proved changes to the ve hicle. For this reason ,
if pa rts have to be replaced , please obse rve
the following points when install ing addition­
a l accessories: Approved Audi accesso
ries and genuine Aud i
parts are available from authorized A udi deal­
ers.
T hese dea le rs a lso have the necessary facili­
ties, tools and tra ined specialists to install the
parts and acc essories proper ly .
A WARNING
-Using the wrong spare parts or using non-
approved accessories can cause damage to
the veh icle and ser ious persona l injury.
- Use on ly accessories express ly approved
by Audi and ge nuine Audi spare parts
- These parts and accessories have been
specia lly designed to be used on yo ur ve­
h icle .
- Never install accessor ies such as tele­
phone crad les or beverage ho lders on a ir­
bag covers or within the airbag deploy­
ment zones . Do ing so will increase the
risk of injury if a irbags are triggered in an
accident!
- Before you check anything in the engine
compa rtment, always read and heed a ll
WARNI NGS
9 page 228 .
(D Note
-If items other than genu ine Audi spare
parts, add-on equipment and accessory
items are used or if repair work is not
performed accord ing to specified meth­
ods, this can resu lt in seve re damage to
your vehicle's eng ine and body (such as
corrosion) and adversely affect yo ur vehi ­
cle's warranty .
- The innovative a luminium concept of
your Audi AB means that all servicing, re­
pairs or other work on the vehicle body
must be carr ied out exclusive ly by an
Audi workshop .
- If emergency repairs must be performed
elsewhere, have the veh icle examined by
an authorized Audi dealer as soon as
possible .
- The manufacturer cannot be held liable
for damage wh ich occurs due to failure
to comply with these stipulations .

296 Index
AUTO Automatic cl imat e control . ... ... ... .. 79
Automatic headlights ....... .. .... . . 46
Auto Lock 33
Automatic belt retractor . . . . . . . . . . . . . 146
Automatic climate control Air vents ... ................ ..... .. 80
Automatic recirculation .............. 81
Operation . . . . . . . . . . . . . . . . . . . . . . . . . 79
Se tup . .. .. .. . .......... .. .. .... .. 81
Automatic climate control system synchronizing ................ .... .. 80
Automatic t ransmission ... .. .. .. .. .. . 114
Automatic transmission (tiptronic)
Eme rgency mode .............. .... 118
Kick-down . . . . . . . . . . . . . . . . . . . . . . . . 117
Manual shifting ........... ... .. ... 117
Parking lock emergency release . .... . 119
Selector lever posit ions ............. 114
Automatic wipers . . . . . . . . . . . . . . . . . . . . 53
Auto Safety Hotline ................ . 141
Average consumption ........... .. .. .. 25
Average speed . . . . . . . . . . . . . . . . . . . . . . . 25
Avoid damaging the vehicle ...... .... . 207
B
Batt ery . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
Charging . ............... .. .. .... . 242
I mportant warnings ....... ... .. .. . 241
Loc ation ... ................ ..... . 241
low .. ... .................. ..... . 202
Replacing the battery ..... .. .. .. .. . 243
State of charge ........... .. .. .... . 202
Winter operation .................. 240
Working on the battery ............. 241
Before driving .............. ... .... . 133
Blended gasoline ........ .. .. .. .. .. . 220
Blower (automatic climate control) . . . . . . 80
Boost er seats .............. ... .... . 182
Brake assist : Post-collision ..... .. .. .. . 198
Brake fluid Changing the brake flui d ... .. .. .. .. . 239
Checking the brake fluid level . .. ..... 239
What is the correct brake fluid level? .. 239
What should I do if the brake fluid warn-
ing light comes on? ............... . 239 Brake system
Anti- lock braking system ............. 19
Brake assist system ................ 197
Brake booster ..................... 200
Brake fluid .... .. ............. .... 239
Brake fluid specifications for refill and re -
placement .. .. .. .. ..... ........ .. 239
Brake light defective . . . . . . . . . . . . . . . . 22
Brake pads .. .. . .. ............ .. .. 205
El ec tromechanical parking brake ...... 85
Fluid reservoir ... ................. 239
How does moisture or road salt affect the
brakes? ......... .. .............. . 199
Warning/indicator lights ........ .... . 14
Worn brake pads symbol . . . . . . . . . . . . . 20
braking guard Messages ..... .. .. .............. .. 99
Braking guard ..... ................ .. 92
Settings . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Break-in period .. .. ............. .. .. 205
Brake pads .. .. .. ...... .... .... ... 205
Tires 205
Bu lbs ..... ..... .. .. .............. . 280
C
California Proposition 65 Warning ... .. 229
Battery specific . . . . . . . . . . . . . . . . . . . 242
Capacities .. .. .. .. ............. .. .. 288
Engine oil ..... ... .............. .. 231
Carbon parts
Cleaning .................... 216,217
Car carrier Transporting your vehicle ........... 285
Care ... .. .. .. .. .. ............. .. .. 214
Cargo are a
refer to Luggage compartment ...... .
Catalytic converter
Center armrest 139
206
Cockpit ... .... .. ............. .... . 61
Rear
Central locking .. .................. . .
Emergency locking .......... ..... .. . 68
33
37
Certification .... .. ............. .... 293
Changi ng a wheel .. ... .......... .. .. 269
Ch . . 'l
angmg engine
01 ....••....•..... • 235

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Checking
Engin e coolant leve l .... ... .. .. .. .. . 237
r ,re pressure . ... ...... ... .. .. .. .. . 25 1
Ch ild restra ints
Danger o f using ch ild restra ints in the
front seat .. .... .. .... ... .. .. .. ... 153
Where can I get additional information
about child restraints and their use? .. 193
Ch ild restra int system anchors . .. .. .. . 187
Ch ild sa fety .. ............. .... .. ... 174
Convertible locking retractor . . . . . . . . . 184
Guidance fixtures for lower anchorages 189
I mportant safety instructions fo r us ing
child safety seats ......... .. .. .. .. . 177
I mportan t th ings to know when dr iv ing
with chi ldren ... .. .... ... .. .. .. ... 174
Tether anchors
Tether straps
Ch ild safety loc k 191
191
Rear doors (mechan ic al ) ... .. .. .. .. .. 4 1
Rear doors (power) .... ... .. .. .. .. .. 41
Ch ild safety seat
Unused safety belts on the rea r seat . . 179
Ch ild safety seats .......... .... .. .. .
180
Booster seats . . . . . . . . . . . . . . . . . . . . . 182
Convertible ch ild seats ........... .. 181
Convertible locking retractor .. .. .. .. . 184
H ow do I properly install a child safety
seat in my vehicle? ........ .. .. .. .. . 177
I nfant seats . . . . . . . . . . . . . . . . . . . . . . 180
I ns tall ing .. ... .. ..... ... .. .. .. ... 184
Instal ling a chi ld restraint using the
L ATCH system ..... .... ... .. .. .. ... 190
LATCH system ............ .... .. .. . 190
Lower anchorages ........ .. .. .. .. .
Mounting and releasing the anchorage
hook
. . ' . ... ................... . '
188
190
Safety instructions . ..... .. .. .. .. .. . 177
Cleaning 214
Climate con trols . . . . . . . . . . . . . . . . . . . . . 78
Climate control system Supp lementary heater .......... .... . 81
Clock ..... .. .. .. .. .. .... ... .. .. .... 27
C losing
Panorami c sun roof ........ .. .. .. .. .. 44
Sliding/ tilting sun roof .. ... .. .. .. .. .. 43
Sun shade (panoramic sunroof) ... .. .. 45 Co
ld tire inflation pressure ..... ... .. .. 249
Coming home Compact spare tire 48
268
Compartments . . . . . . . . . . . . . . . . . . . . . . 7 4
Compass in the m irror .............. .. S6
Compliance ... .. .... . ... ...... ... .. 293
Consumer Information . . . . . . . . . . 141, 290
Consumption (fuel) ............. .... . 25
Contacting NHT5A
Controls Cleaning
Convenience key . .. ................. . 141
216 35
Starting the engine ................ . 83
Stopping the eng ine (START ENGIN E
STOP button) . . . . . . . . . . . . . . . . . . . . . . 83
Switching the ignition on ............ 83
Un locking and lock ing vehi cle .... .. .. . 35
Convertible child safety seats ....... .. 181
Convertib le locking retractor
Activating ... .... .. . .. .. ..... ... .. 186
Deactivating ..... .. . .. ... .... ... .. 186
Using to secure a child safety seat 1.84, 186
Coolant
refer to E ng ine coolant . ..... ... .. .. 236
Cooler ....... .. .... .......... ...... 76
Cleaning 217
Operation . . . . . . . . . . . . . . . . . . . . . . . . . 76
Cooling mode (automat ic climate control) 79
Cruise contro l
Changing speed ..... .. ..... ... .. .. . 91
Presett ing your speed .......... .... . 91
Switching off .. .. .... .... ....... .. . 91
Switching on . .. .. ...... ........... . 90
( upholder . ... .... .. . .. .. ..... ... .. . 74
Cu rve light ........ .. ..... .......... 108
Cylinder management
refer to Cylinder on demand System . . . 25
Cylinder on demand System ... ... .. .. . 25
D
Data recorde r
Date d isp lay 196
27
Daytime runn ing lights . .. ..... ... .. .. . 46
Decla rat io n of compliance
Adaptive cruise cont rol .... ..... .. .. 293
A udi s ide ass ist .. .. ........... .... 293
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Index 299
-----------------------------------.......
Emergency warning triangle ... .. .. .. . 266
Energy management ................ 202
Engine Compartment ..................... 230
Coolant .. ............... ......... 236
Data .. .. ..... ........... ...... .. 289
Start-Stop-System . . . . . . . . . . . . . . . . . . 87
start ing .. .. ................. .. .. .. 83
Starting wi th jumper cab les ......... 281
S topping . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Eng ine compartment ................ 230
C losing the hood ................ .. 229
Opening the hood ............ .. ... 228
Safety in structions .......... .. .. ... 228
Wo rking in the engine compa rtment .. 22 8
Eng ine coolant ..................... 236
Adding coolant ............ ...... .. 237
Checking the eng ine coolant leve l ... .. 237
E xpansion ta nk .................... 237
M alf unc tion symbo l ................. 15
Radiato r fan . ..... .... ... .. .. .. ... 238
Temperature ga uge .... ... .. .. .. .. .. 10
E ng ine oil . .. ..... ........ ...... .. . 23 1
Adding . ... ................ ... .. . 234
Addit ives . .. ................. .. .. . 234
Changing . ... ... ..... ... .. .. .. ... 235
C hecking oil level . ..... ... .. .. .. .. . 234
C hec king the engine oil level . ... .. .. . 233
Consumpt ion .................. ... 234
Indications and condit ions requ iring ex-
tra check ing ...................... 233
Indicator light . . . . . . . . . . . . . . . . . . . . . 17
O il consumption .... ... ... .. .. .. .. . 233
O il grades .. ................. .. ... 23 1
P ressu re malfunction ................ 17
Recommended oil check in tervals .. ... 233
Sensor defective . . . . . . . . . . . . . . . . . . . . 21
Specification and viscosity . ... .. .. .. . 23 1
E ng ine sound ............. .... .. .. . 108
Eng ine speed limitat io n ............... 21
E ng ine start -stop mode
refer to Sta rt-Stop -Sys tem ... .. .. .. .. 89
E ntry assistance . . . . . . . . . . . . . . . . . . . . . 64
Environment Break- in period ............... .. ... 205
Catalytic converter ............... .. 206
D iese l part icu late filter ............. 206
Di sposing of yo ur vehicle batte ry 2 43 Driving at high speeds
.. ..... ... .. .. 208
Drivi ng to minimize poll ution and noise 207
Fuel . ... .. .. .. .. .. . .. ... .... ... .. 223
Fuel economy ..................... 207
Leaks under your vehicle ............ 228
Letting the vehicle stand and warm up . 208
Proper disposal of dra ined brake fl uid . 239
Proper disposal of d ra in ed eng ine cool-
an t ............................. 237
P roper disposal of dra ined eng ine
o il . . . . . . . . . . . . . . . . . . . . . . . . . 234, 235
Recycling used engine oil ..... ... .. .. 234
U nl eaded fuel .. .. .. . ... ...... ... .. 220
What shou ld I do with an o ld battery? . 243
E PC
refer to Elect ron ic power control (EPC) . 20
ESC Post-coll is ion b ra ke assist .......... . 198
also refer to Electronic Stab ili zation Con-
t ro l (E SC) ... .. ................... 197
Event Data Recorder (EDR) ............ 196
Exhaust tail pipes Cleaning . ... .... .. . .. .. ..... ... .. 216
E xpansion tank .. ... ................ 237
Exterior lighting ..................... 46
Exterior mi rrors
Adjusting ... .... .. . .. .. ..... ... .. . 55
Dimming ...... ................... . 56
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
E xterior tempera ture display ........... 23
F
Fastening
B oos ter sea ts .. ................... 182
Convertib le child sa fety seats . ... .. .. 18 1
Infant seats ... .... . ... ...... ... .. 180
Floor mats .. ... .... ........... ..... 139
Fo lding table .... .................... 69
Foot ped als . .... ................... 138
For the sake of the environment
Gasoline fumes and the env ironment .. 223
Reduc ing engine nois e by ea rly upshift-
i ng ............................... 10
Ref uell ing ... .. ................... 22 3
Saving f uel by early upsh ifting ... .. .. . 10
Four zone automat ic climate control ..... 79
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