2021 AUDI A8 hood open

4N0012721BF
Checking and Filling

> Push the release button again and remove the
cap completely.
> Add coolant mixed in the correct ratio
=> page 281 up to the MAX marking.
> Make sure that the fluid level remains stable.
Add more coolant if necessary.
> Turn the cap to the right to tighten it until you
feel resistance a second time.
Coolant loss usually indicates that there is a leak.
Immediately drive your vehicle to an authorized
Audi dealer or authorized Audi Service Facility
and have the cooling system inspected. If the
cooling system is not leaking, coolant loss can re-
sult from the coolant boiling due overheating
and then being forced out of the cooling system.

der any circumstances > page 277, fig. 181.
If the coolant expansion tank for the high-
voltage system is not sealed, please contact
an authorized Audi dealer or authorized
Audi Service Facility.
— When adding coolant, it may leak into the
inside of high-voltage components and
cause a short circuit, increasing the risk of

fire.


ZA WARNING
— The engine compartment in any vehicle is a
potentially dangerous area. Stop the engine,
switch the ignition off, and allow the engine
to cool before working in the engine com-
partment. Always follow the information
found in > page 274, General information.
— Never open the hood if you can see or hear
steam or coolant escaping from the engine
compartment. This increases the risk of
burns. The cooling system is under pressure.
When you no longer see or hear steam or
coolant escaping, you may open the engine
compartment with caution.
— When working in the engine compartment,
remember that the radiator fan can switch
on even if the ignition is switched off, which
increases the risk of injury.
— Coolant additive and coolant can be danger-
ous to your health. For this reason, store the
coolant in the original container and away
from children. There is a risk of poisoning.
CG) Note
Do not continue driving if the coolant expan-
sion tank is empty. Do not add any coolant,
because air could enter the cooling system
and damage the engine. See an authorized
Audi dealer or authorized Audi Service Facility
for assistance.
Brake fluid

BFV-0229|




ZA WARNING
Applies to: vehicles with plug-in hybrid drive
The coolant expansion tank for the high-volt-
age system may only be opened or filled by an
authorized Audi dealer or authorized Audi
Service Facility.
— The coolant expansion tank cap is equipped
with a seal that must never be removed un-


Fig. 184 Engine compartment: cap on brake fluid reservoir
Observe the safety precautions > page 274, Gen-
eral information.
Checking the brake fluid level
> Slide the cover that is located below the wind-
shield wipers on the driver's side toward the
windshield and remove the cover.
> Read the brake fluid level on the brake fluid res-
ervoir > page 277, fig. 181. The brake fluid lev-
el must be between the MIN and MAX markings
oA.
The brake fluid level is monitored automatically.
Messages
EG 7 @ Brakes: stop vehicle and check brake
fluid level
283
>

Checking and Filling


Always keep children away from battery
acid and the battery. @
@/
oo

Always follow the instructions in the oper-
ating manual.

@ For the sake of the environment
2 ¥ Lead-acid batteries must be disposed of
using methods that will not harm the environ-
ment. Do not dispose of them in household
trash. They contain harmful substances, such
as sulfuric acid and lead, and also recyclable
raw materials. Contact an authorized Audi
dealer or authorized Audi Service Facility for
more information.
Other battery types
Explanation of warnings:
® ®
@/
oo

Fire, sparks, open flame, and smoking are
forbidden.
Always keep children away from battery
acid and the battery.
Always follow the instructions in the oper-
ating manual.




ZA WARNING
All work on the batteries must only be per-
formed by an authorized Audi dealer or au-
thorized Audi Service Facility.
— Gases that escape from these different bat-
tery types can be poisonous or flammable.
— The contents of these battery types can be
corrosive. If any battery contents come into
contact with the skin, flush the affected
area for at least 15 minutes with clean wa-
ter. Then wash the affected area with soap.
Have the affected area examined by a medi-
cal professional.
@) Note
Components must not be connected to the
battery terminals and wires on these battery
types because this increases the risk of dam-
age, for example due to overvoltage.

286
@) For the sake of the environment

OE These types of batteries must be dis-
posed of using methods that will not harm
the environment. Do not dispose of them in
household trash. They contain harmful sub-
stances and recyclable raw materials. Contact
an authorized Audi dealer or authorized Audi
Service Facility for more information.
arging the 12 Volt vehicle battery

Fig. 185 Engine compartment: connectors for a charger or
jump start cables
Observe the safety precautions > page 274, Gen-
eral information, > /\ in Battery general infor-
mation on page 285 and > /\.
Requirement: only use chargers with a maximum
charging current of 14.8 volts. The battery ca-
bles remain connected.
The charging cable connections are located in the
motor compartment. The ground point ©) is al-
ways located on the vehicle body.
> Switch off the ignition and all electrical equip-
ment.
> Open the hood > page 276.
» Press the release lever on the positive terminal
and fold the cover upward > fig. 185.
> Clamp the charger terminal clamps to the jump
start pins according to the instructions. (Hex
head bolt under a cover (), ground point on the
vehicle body ©)).
> Insert the power cable for the charging device
into the socket and switch the device on.
> At the end of the charging process, switch the
charger off and pull the power cable out of the
socket.
» Remove the charging device terminal clamps. >

4N0012721BF
Index


Cleaning carbon components........ 312, 314
Cleaning control « sisi + wee x x deere se mane 313
Cleaning decorative parts andtrim........ 312
Cleaning exhaust tail pipes.............. 312
Cleaning plastic parts.................. 313
Cleaning textiles..................000, 313
Climate control system..............00. 100
Climate control system controls in the rear
Child Safety \OCKicw: ¢ : nee 5 2 cones ¥ 2 owen gy 51
Closing
Automatic luggage compartment lid...... 49
Convenience Closingtos « a sss « sazene w © enuvee 53
HOOd .. 0... cece eee 276
Luggage compartment lid............... 49
Luggage compartment lid with foot motion . 50
Panoramic glass roof................... 53
Rear window sunshade...............-. 55
Sunshades(roof)' « seissies wo sense ow amnion oo oyeu 53
Sunshade (windows). ...........5250005 52
WINGOWS = say = : wees ss eam ¢ tees a ee 52
Closing aid (power closing doors).......... 41
Coasting .... 0.0.6.0 cece eee eee eee 114
Cockpit dimming..............0ee eee eee 63
Cockpit (overview) ......... 0. cee eee ee eee 6
ColoreOdetin. « a sas + « cnewere + rises w ¥ aveanee wo 343
COMBUSHONCNGING cscs: ss wees se ewes oe wa 114
Combustion engine startup.............. 112
Comfort auxiliary climate control......... 105
Comfort:entty © sees ¢ seems sv een cv ewe ve 125
Coming home/Leaving home
refer to Entry/exit lighting «cis. eecs es vs 61
Compact Spare tire = sexs sy sews « ¢ ees g x os 323
GOMmpartiietits's « : wowy = : mews 2 : eeees 2 2 ee 95
Compass inthe mirror............-...0-- 68
Compliance ........ 0... eee eee eee eee 341
Conference call...............-.-.2.20005 217
Configuration wizard.............0...00- 20
COMMC Cina +o auveara wo wivaens ao aweiie a awa oa ae 222
Data plans...... 2... eee eee eee ee 225
Data Privaey'ss: s & seis s ¢ aces s ences se mee 336
Emergency:¢alll. sscsscx 2 cane # een + waver « 227
Infotainment
Infotainment services. ............0005 223
Online roadside assistance............. 228
Vehicle control services............200- 224
Connected devices
Device overvieW......... 0.00. cece eee 265
Connections
referto Media............eeeeeee 250, 253
Consumer information...............005 338
Consumption
Reducing ; = ess < sex ¢ s ween e x see «ee 116
Consumption (uel) « « was « asses os say & se 16
Contacts
IMPOFtlNG sews 2 « wees 2 aoe 2 BORE & e Gow 219
Updating inthe MMI...............06 219
also refer to Directory................. 216
Convenience key..........-..0 eee eee eee 41
CONVENIENCE CLOSING iss & same a 2 Hace § x HOR 53
also refer to Vehicle key..............0. 45
Convenience opening and closing
SUMSHAGE cmwsces wa ceowems «x amernte mo meneME aw one 53
Windows or panoramic glass roof........ 53
Coolant temperature display.............. 14
Cooled glove compartment............... 95
Gooling MMO eke... cesses + wenn as aineins ow te 101
Cooling system
Adding
coolant ............00 ee eee eee 282
Checking the coolant level.............- 282
GOOLANE cessawe se sevens eo seo ow oumORI wa aeRO 281
Cornering lights: « » eaves x s wewe a e mews 2 s pew 58
Cross traffic assist (intersection assistant) .. 185
Cruise Control’ system: « s wm sv esex s oes 163
Cup
holders. ...... 00... cee eee eee eee 95
Current consumption..................0. 16
Curve tilting function.................0. 125
D
Data module
Serial number (IMEI) .................. 219
Data plans........ 0... eee eee eee eee 225
Data Privacy. ... 00... cee cece eee 336
DAES ccaseus so anzee 0 0 emecen 4m cnneeis a memati © sxetone 16
Setting............ 0.0.2 263
Daytime running lights.................. 58
Declaration of compliance............... 341
DEF (instrument cluster)...............0. 12
Demo mode
refer to Presentation mode............. 240
Destination onthe map................. 233
347

Detailsts » swccu © x wweove ox seivean a x seme 2 2 wees 233)
Determining correct load limit........... 303
Digital compass ..............0 eee eee 68
DIMENSIONS): « : wees « « wees sg eas ge eR ae 343
Dimming the exterior mirrors............. 64
Dimming the rearview mirror............. 64
Directory .... 2... eee cee eee eee 216
BUSINGSS;Card wen = waam 2 2 weien x > mane a o 216
SeOttiNQS: css « serene ¢ v suewas ev ere Sw eee & 219
Display
CLEARTITG Ae = «: susnens a oi urea ao cieeie « 0) anetine 0 i 313
DispOSalecie «+ sssoee a 0 ensues wo mezess vv arate @ 338
DistamC@ enc o «vse ov wasen a a oawe 2 a wm ¥ os 16
Distance warning sews so ssc + awson 9 & secon 175
Doors
Ghildisafiety lOGk seccas x 0 neue x cnemen « 0 aseasin 3 51
Door contact switch...............200-. 62
Mechanically unlocking and locking....... 44
Power closing/closing aid............... 41
Driver information system................ 13
Drives
refer to Media...............0-4- 250, 253
Drive select
refer to Audi drive select............... 124
Drive systeM.... 0.0... ee eee eee eee 114, 118
Audi drive select .............0.000008 124
Driving down hills.............2.-00 eee 122
Driving program........ see e eens 110,174
Driving through water.................. 122
Drivingueiime’, so sxeusie «i coissen © a onmvire © eaten wo 2 16
Driving tips
Driving through water...............-- 122
Efficient driving : see: sy esse ss ores 5 ces 116
Uphill and downhill................... 122
Driving UpHillsss « » sess x = wavs a & saws 2 5 wee 122
DVDidfivein: « « saves 2 = cms 5 2 ewes & ese Fe 251
Dynamic all-wheel steering.............. 127
E
| 220
S@CtiNGS news « woes © s woos 4 & ween & 3 rane 220
EDL
refer to Electronic Differential Lock...... 129
EDR
refer to Event Data Recorder (EDR)...... 333
348
Efficiency assiStccc «sows 6 = meee ow eeaee ¥ o 164
Predictive control...............00005 170
Electrical system ..... 0.0... 0. eee eee ee 284
Electric range... . 2... eee eee eee 238
Electromechanical parking brake......... 121
Electronic Differential Lock.............. 129
Electronic immobilizer sss. 5 s een so mayen 4 os 46
Electronic Stabilization Control........... 129
Embedded SIM card s « saga « ¢ secon ae was ¢ 3 223
Emergency assist. ..........00-.0ee eee 186
Emergency assistance.................. 317
Emergency braking function............. 121
Emergency call...............-00. 218, 227
Emergency flashers.............---000-- 61
Emergency Mode w icies saw es cee ee een 112
Emergency operation
DOORS iss secwous « os exewans = x caamene = exanems = > wR & = 44
Fuel filler door... ..... 00... eee eee eee 273
Luggage compartment lid............... 51
Panoramic:glass rOOF sre. 6 2 sree «2 severe o oe 54
Emissions control system.........-.0005 273
Eneroy COnsUMMersios se neww + wen a s eee a sg 16
Enéroy flow display’: sce: ss swam + s aes vee 115
Energy management............--...0- 117
Energy recovery.............0..0.0000. 114
Engine
Breakinigniti's « seus « segues x ¢ awe 3 eee Ze 114
Coolant. ascvons vs acne wo awcvces 0 a semana w stamese 281
Emergency stop.......--..00-.ee eee 107
JUMP StACING « ¢ gems + a eee gy eS 8s ee 323
Start/Stop system « secs so sews oe enews ¥ oo 117
Starting/stopping.............0.-000 107
Engine braking effect
refer to Recuperation................. 114
Engine compartment
Opening and closing the hood.......... 276
OVERVIEW « cscs +o soeces «a sserens wo aewens © a ow 277
Safety precautions..............0000 0 274
Engine oil
AGING « xsins < = cevan ¢ § Sates 7 5 Ee FS ESR 277
CHANGING ie: @ 2 ween 2s eee sa ee oe ewe 2 280
Checking oil level... .. 0... . cee ee eee eee 277
Consumption....................200- 277
Indicator lights. 5 ws s ewes » s wwe as eens 278
Replacement interval................. 287
Temperature display................0-. 1s

4N0012721BF
Index

Online services
refer toconnect.......... cece eee eee 222
Online system update.................. 264
Online traffic information............... 239
OPeniing sc» « swesius © o cwcwew w eeewesens vt euswens we eaewoue 41
Automatic luggage compartment lid...... 49
Convenience opening...............0405. 53
Fuel-fillerdoor's « s sve ¢ « weeoa ¢ 0 wanes ¥ ane 271
HOOd .... cece eee 276
Luggage compartment lid............... 49
Luggage compartment lid with foot motion . 50
Panoramic glass roof..............2000. 53
Rear window sunshade................. 55
Surishaden(root) « scons «a accuse 2 x emma oo ose 53
Sunshade (windows) ..............00005 52
Windows ......... 20. eee eee eee 52
Opening and closing
refer to Unlocking and locking........ 41, 46
Opening the charging port door.......... 134
Operating
Head-up display’: « « seis ie gees + eres + eo 33
Instrumenticluste tienes» « secre a sangse « = snees T3'
Multifunction steering wheel............ 13
Multi Media Interface............... 18,21
Rear Seat Remote..............0005 18, 28
Text input... 6.2... eee eee eee eee 25
Towchdisplay's = 2 sews « s sews & «ee ¢ eee 2 18
Voice recognition system.............-. 34
Operating¢mModes « sein «sows + wae w ¥ wae 114
Optional equipment number............. 343
Options
Medias a scasss i a susaas « o: anmwons 4 nmnuans 4 aseatas 257
Radio... ieee eee 248
Outside noise... eee eee eee eee 116
Overview: (GOCKpit):. « swine o « creme a simone « 0 scene 6
P
PaiMtCOde la . o sccvam aw seauewe & avevane & o voeaun a os 343
Paintdamagess « « wseas 6 www ve sees & o renee 312
PANIC BUGLON': ¢ mess ss wenu s y eens « ¥ ene 5 2 45
PANIG fUNCtION Se: = = sews = ¢ aeupe ¢ o ee 3 eee 45
Panoramic glass roof.......... eee ee eee 53:
Convenience opening and closing......... 53
Emergency closing............-..20-005 54
Quick opening and closing.............. 54
Parental control
DVD... oes 257
Rear Séat REMOtes s acaw 5 « meme ay wens 2 oe 28
Parkassist plUS « scas + < xan 4 e eee eRe 198
Parking... ... cece cece eee e eee 108
Parking aid... . 1.0... eee cece eee eee eee 188
Adjusting the volume................. 190
Automatic activation.................. 189
Cleaning the sensors and camera........ 311
Deactivating rear cross-traffic assist .... . 195
Parkcassist:plusiac ss scoaa «waa a 3 wien ooo 198
Parking aid plus...............02-.00. 188
Parking space search.................. 196
Peripheral
cameras............-0000-- 191
REARVICWHGAIMIEF Alcan x exessene so acenece a 0 eonsere 191
Remote controlled parking............. 202
Switching off maneuver assist.......... 208
Parking and maneuvering.............-- 188
Parking brake
refer to Electromechanical parking brake. 121
Parking heater
refer to Auxiliary climate control........ 104
Parking light Sie 2 o ccs + venues eo rece eo eoeneee 58
Parking lock emergency release.......... 112
Pass=through cscs x ¢ ogee y ees yo ewes so oe 98
Pédalsteius + 2 qeme = © aime < Roe 5 BURN FE HORE 111
Pedestrian detection..............-.00. 159
Perchlorate. ... 2.2.0.0... cece eee eee eee 338
Peripheral cameras............--0000-- 191
Phone
Connecting a second mobile device...... 210
Disconnecting a mobile device.......... 211
SO TEIIGS ssenosw 2 0 cmemeioe « oxsuemen © sitanems a oexints 218
Phonebook
refer to Directory............002--005- 216
PIN
A-digit myAudi PIN...............000488 38
Protection wssine s+ sce ww inne 6 6 anrsass ww anes 39
Playback (media) ..... 0... cess eee eee eee 253
Plug-inmhybrid drive’s « sss x x cages x « emcee a 114
Coolant.......... 00.0. e eee eee 281, 282
Power meter...........0 cece eee eee 15
Plug-in hybrid mode.................0.. 114
Podcast
refer to Online radio.............. 246, 247
Polishing ....... 0... c cece cece 312
353