2021 AUDI A8 check engine light

4N0012721BF
Fuses and bulbs


This can cause damage to the electrical sys-
tem and increases the risk of fire.

Fuse panel (2) (brown)


() Note
If a new fuse burns out again shortly after you
have installed it, have the electrical system
checked as soon as possible by an authorized
Audi dealer or authorized Audi Service Facili-
ty.
@ Tips
— The following table does not list fuse loca-
tions that are not used.
— Some of the equipment listed in the follow-
ing tables applies only to certain model ver-
sions or certain optional equipment.
Fuse assignment - left footwell
Fig. 209 Left footwell: fuse panel with plastic clip

Fuse panel @ (brown)
No. | Equipment

Engine ignition coils

Engine start, electric drive clutch

Windshield wiper control module

Left headlight electronics


Ul
WIN)
eR
Climate control system blower

6 | Instrument panel

Windshield wipers

Zz
8 |High-voltage heating, compressor
9 Panoramic glass roof

Fuse panel (2) (black)
No. | Equipment

1 |Engine mount

N Left rear door control module

Windshield washer system/headlight
washer system




4 |Right headlight electronics
5 | Front seat heating
6 |Right rear door control module
7 |Sockets
8 | Left front door control module
9 |Parking heater
Fuse panel @) (red)

No. | Equipment

Anti-theft alarm system

Engine control module

Horn

Parking brake

Diagnostic interface

Roof electronics control module

WOlLOINI
DI
WIN]
rR
Driver assistance systems control module

10 | Airbag control module

Electronic Stabilization Control (ESC), An-
LL
ti-Lock Braking System (ABS)

Rear climate control unit, diagnostic con-
12
nector, light/rain sensor


Climate control system, vehicle electrical
13
system control module

14 | Right front door control module

Climate control system compressor, vehi-
15
cle electrical system control module

16 | Brake system pressure reservoir

Fuse panel (@) (black)

No. | Equipment


1 |Engine components

329

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