engine AUDI A8 2020 Repair Manual

Checking and Filling

Applies to: Audi tablet: Select on the home
screen: VEHICLE > Service intervals.
Resetting the indicator
An authorized Audi dealer or authorized Audi
Service Facility will reset the service interval dis-
play after performing service.
If you have changed the oil yourself, you must re-
set the oil change interval.
Applies to: MMI: To reset the display, select on
the home screen: VEHICLE > Settings & Service
> Service intervals.
@) Note
— Only reset the oil change indicator if the oil
was changed.
— Following the service intervals is critical to
maintaining the service life and value of
your vehicle, especially the engine. Even if
the mileage on the vehicle is low, do not ex-
ceed the time for the next service.
288

4N0012721BD
Wheels

Make sure that the tire designa- The following table lists recom-
tion on your tire matches the des- mended tire pressures in cold
ignation on the tire pressure label tires according to the load and





and the tire pressure table. the size of the tires installed.
Model/ Tire designation Tire pressure
Engine Normal load Maximum load
(up to 2/3* people)”
Front Rear Front Rear
PSI | kPA | PSI | kPA | PSI | kPA | PSI | kPA
AB L: 255/45 R19104H | 35 240 | 32 | 220 | 38 | 260 | 38 | 260
3.0L 255/45 R19104Y | 35 240 | 32 | 220 | 35 | 240 | 35 | 240
6-cylinder
265/40 R20 104H 35 240 32 220 38 260 38 260
265/40 R20 104Y 35 240 32 220 35 240 35 240
275/35 R21 103Y 35 240 32 220 35 240 35 240




A8L: 255/45R19104H| 38 | 260 | 33 | 230 | 41 | 280 | 41 | 280
4.0L 255/45 R19104Y | 35 240 | 32 | 220 | 38 | 260 | 38 | 260
8-cylinder
265/40R20104H| 38 | 260 | 33 | 230 | 41 | 280 | 41 | 280
265/40 R20104Y | 35 | 240 | 32 | 220 | 38 | 260 | 38 | 260
275/35 R21103Y | 35 | 240 | 32 | 220 | 38 | 260 | 38 | 260
A8LTFSIe: |255/45R19104H| 36 | 250 | 36 | 250 | 39 | 270 | 42 | 290
3.0L 255/45 R19104Y | 35 240 | 35 | 240 | 38 | 260 | 41 | 280








Groytinder 265/40R20104H| 36 | 250 | 36 | 250 | 39 | 270 42 | 290
265/40R20104Y | 35 | 240 | 35 | 240 | 38 | 260 41 | 280
275/35R21103Y | 35 | 240 | 35 | 240 | 38 | 260 41 | 280
S8L: 265/40R20104Y | 38 | 260 | 33 | 230 | 42 | 290) 39 | 270
4.0L 265/35R21101Y | 42 290 | 36 | 250 | 46 | 320 | 44 | 300
8-cylinder
275/35 R21 103Y 39 270 35 240 44 300 41 280

@) Vehicles with four seating positions: two people in the front, Vehicles with five seat-
ing positions: two people in the front, one person in the rear

JN WARNING Tires and vehicle load limits
Please note the important safe- | There are limits to the amount of
ty precautions regarding tire load or weight that any vehicle
pressure > page 299 and load and any tire can carry. A vehicle
limits > page 301. that is overloaded will not handle

well and is more difficult to stop.
Overloading can not only lead to >
301

Emergency assistance

>» Slide the wheel wrench from the vehicle tool kit
all the way onto the wheel bolt).
> Turn the wheel bolt approximately one turn to
the left. To achieve the required torque, hold
the end of the wheel wrench. If the wheel bolt
will not loosen, press carefully on the wheel
wrench with your foot. Hold onto the vehicle se-
curely while doing this and make sure your foot-
ing is stable.

ZA WARNING
To reduce the risk of an accident, only loosen
the wheel bolts gently one turn before raising
the vehicle with the vehicle jack*.
Raising the vehicle
Applies to: vehicles with vehicle jack



> Find the marking on the sill that is closest to
the tire that will be changed > fig. 201. Behind
the marking, there is a lifting point on the side
sill for the vehicle jack.
> Turn the vehicle jack located under the lifting
point on the sill to raise the jack until its arm @
=> fig. 202 is located under the designated plas-
tic mount.
> Align the vehicle jack so the arm (@) engages in
the designated Lifting point in the door sill and
the movable base (2) lies flat on the ground.
The base @) must be directly under the mount-
ing point @.
> Continue raising the vehicle jack until the wheel
lifts off the ground slightly.



RAZ-0257,

Fig. 202 Sill: positioning the vehicle jack
> Place the vehicle jack from the vehicle tool kit
ona firm surface. Use a flat, stable support if
necessary. On a slippery surface such as tile,
you should use a non-slip pad such as a rubber
mat > /A\.

D_ You need the matching adapter in order to loosen and
tighten anti-theft wheel bolts* > page 319.
320

Z\ WARNING
—To reduce the risk of injury, make sure no
one is in the vehicle before raising it.
— Make sure the vehicle jack is stable. The risk
of injury is increased when the ground is
slippery or soft, because the vehicle jack
could slide or sink.
— Only raise your vehicle with the vehicle jack
provided by the factory. If you use a vehicle
jack designed for another vehicle, your vehi-
cle could slip and cause injury.
— Position the vehicle jack only at the desig-
nated mounting points on the side sill and
align the jack. Otherwise, the vehicle jack
could slip and cause an injury if it does not
have sufficient hold on the vehicle.
—To reduce the risk of injury, do not raise any
other vehicles or other loads using the vehi-
cle jack provided by the factory.
— Changes in temperature or load can affect
the height of the vehicle.
— To reduce the risk of an accident, never start
the engine when the vehicle is raised.
—To reduce the risk of injury, no work should
be performed under the vehicle while it is

raised.

Emergency assistance

To benefit fully from the advantages of the uni-
directional tire design, you should replace faulty
tires as soon as possible and restore the correct
running direction on all of the tires.
> Reinstall the caps on the wheel bolts if necessa-
ry.
> Store the vehicle tool kit in its designated
place.
> If the removed wheel does not fit in the spare
wheel well, store it securely in the luggage
compartment > page 100.
> Check the tire pressure on the installed wheel
as soon as possible.
> Correct the tire pressure and store it in the MMI
=> page 308.
> The wheel bolt tightening specification must be
90 ft lbs (120 Nm). Have it checked as soon as
possible with a torque wrench. Drive carefully
until then.
> Have the faulty wheel replaced as quickly as
possible.
Space-saving spare tire
Applies to: vehicles with space-saving spare tire (compact
spare tire)
The spare tire is intended for short-term use only.
Have the damaged tire checked and replaced if
necessary by an authorized Audi dealer or author-
ized Audi Service Facility as soon as possible.
There are some restrictions on the use of the
compact spare tire. The compact spare tire has
been designed specifically for your type of vehi-
cle. Do not replace it with the spare tire from an-
other type of vehicle.
The compact spare tire is located in the luggage
compartment under the cargo floor cover
> page 316.
The tire pressure must be 61 PSI (420 kPA).
Snow chains
For technical reasons, the use of snow chains on
the compact spare tire is not permitted.
322
If you have to drive with snow chains and a front
tire fails, mount the spare tire in place of a rear
tire. Install the snow chains on the rear tire that
you removed, and install that in place of the
front tire that failed.

ZA\ WARNING
— After installing a spare tire, the tire pressure
must be checked as soon as possible.
— Do not drive faster than 50 mph (80 km/h)
with a compact spare tire. Driving faster
than that increases the risk of an accident.
— To reduce the risk of an accident, avoid hard
acceleration or braking and driving fast
around curves with the compact spare tire.
— To reduce the risk of an accident, never drive
with more than one compact spare tire.
— Normal summer or winter tires must not be
mounted on the compact spare wheel rim.

Jump starting
You should only perform the steps that follow if
you have the necessary tools and technical ex-
pertise.
If the engine does not start because the vehicle
battery is drained, you can jump start your vehi-
cle using another vehicle. Jump start cables are
needed to do this.
Both vehicle batteries must have 12 V nominal
voltage. The voltage capacity (Ah) of the vehicle
battery that is giving power must not be less
than the capacity of the drained vehicle battery.
Jump start cable
Only use a jump start cable with a large enough
diameter. Note the manufacturer's specifica-
tions.
Only use a jump start cable with insulated termi-
nal clamps.
Positive cable - usually red.
Negative cable - usually black.

4N0012721BD
Emergency assistance



ZA\ WARNING
— A drained battery can freeze at tempera-
tures around 32 °F (0 °C). If the vehicle bat-
tery is frozen, it must be thawed before con-
necting the jump start cables. If it is not,
the risk of an explosion and chemical burns
increases. After jump starting the vehicle,
drive to an authorized Audi dealer or author-
ized Audi Service Facility immediately to
have the vehicle battery checked.
— Read the warnings when working in the en-
gine compartment > page 274.
— Handling the jump start cables incorrectly
may cause the vehicle battery to explode
and lead to serious injuries.

() Note
— Jump start cables can cause considerable
damage to the vehicle electrical system if
they are connected incorrectly.
— Plug-in hybrid drive: You must not give a
jump start with your vehicle. This could
cause significant damage to the electrical
system in your vehicle.
G) Tips
— There must be no contact between the
vehicles, or else voltage could flow when
connecting the positive terminal and drain
the vehicle battery of the vehicle providing
the jump start.
— The drained vehicle battery must be con-
nected correctly to the electrical system.
— Switch off electrical equipment that is not
needed.
aoe aalale]
Both jump start cables must be connected in the
correct order.

Fig. 205 Engine compartment: connectors for jump start
cables or a charger



Fig. 206 Connecting the jump start cables
The jump start cable connections are located in
the engine compartment.
Follow the information about the vehicle battery
=> page 284.
Connecting the positive cable (red) to the
positive terminal
> Open the red cover on the positive terminal
> fig. 205.
1. Attach one end of the positive cable (red) to
the jump-start pin @ 9° fig. 206 on your vehi-
cle.
2. Attach the other end of the positive cable
(red) to the positive terminal @) on the pow-
er source.
Connecting the negative cable (black) to the
negative terminal
3. Attach one end of the negative cable (black)
to the negative terminal @) on the power
source. >
323

Emergency assistance

4. Attach the other end of the negative cable
(black) to the jump-start pin @) on the vehi-
cle.
Starting the engine
> Start the engine in the vehicle giving the charge
and let it run at idle.
> Now start the engine in your vehicle, which has
the
drained battery.
> If the engine does not start, stop the starting
procedure after 10 seconds and then repeat it
after approximately 30 seconds.
> Turn on the rear window defogger in your vehi-
cle in order to reduce any voltage peaks that
may occur when disconnecting the jump start
cables. The headlights must be switched off.
> With the engines running, remove the cables in
reverse order of the way they were installed.
> Close the red cover on the positive terminal.

ZA WARNING
— Never connect the jump start cable directly
to your vehicle battery. Only use the connec-
tions in the engine compartment.
— Do not touch the non-insulated parts of the
terminal clamps. The cable must also not
come into contact with vehicle components
that conduct electricity when it is connected
to the positive vehicle battery terminal. This
can cause a short circuit.
— The plugs on the battery cells must not be
opened.
— Keep ignition sources (such as open flames,
burning cigarettes, etc.) away from the vehi-
cle batteries to reduce the risk of an explo-
sion.
— Route the jump start cables so they cannot
get caught in the moving parts in the other
vehicle's engine compartment.

@ Note
Please note that the connecting process previ-
ously described for the jump start cables is in-
tended for when your vehicle is being jump
started.
324
G) Tips
Make sure that the connected jump start ca-
bles have sufficient contact with metal.
Towing
General information
You should only perform the steps that follow if
you have the necessary tools and technical ex-
pertise.
Towing requires a certain amount of practice.
Audi recommends contacting a towing company
to have the vehicle transported.
You should only have your vehicle towed by an-
other vehicle when disabled in exceptional cir-
cumstances. Inexperienced drivers should not
tow.
Notes on towing
When the engine is stopped, the transmission
will not be sufficiently lubricated if traveling at
high speeds and long distances:
— The maximum permitted towing speed is 30
mph (50 km/h).
— The maximum permitted towing distance is 30
miles (50 km).
Additional information on towing with a tow
truck
The vehicle may only be towed with the front axle
raised. Do not wrap any chains or cables around
the brake lines.
Tow bar and towing cable
The vehicle can be towed with a tow bar or tow-
ing cable. Both drivers should be familiar with
the
special considerations when towing, especial-
ly when using a towing cable.
Always make sure the traction force does not ex-
ceed the permitted level and there are no shock
loading conditions. There is always the risk of the
coupling becoming overloaded when driving off-
road.
For the most safety and security, drive with a tow
bar. You should use a towing cable only ifatow >

Fuses and bulbs


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


- 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 side of cockpit


Fig. 211 Left side of the cockpit: fuse panel with plastic
clip

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


Climate control system, interior air sensor

N Phone, roof antenna

Climate control system, fragrance system,
particulate matter sensor

Head-up display

Audi music interface, USB sockets

Steering column lock
Front MMI display
Instrument cluster


Ol/aOIN/uys

10 | Volume control

11 | Light switch, switch panels


12 | Steering column electronics

328
Fuse panel (@ (black)

14 MMI Infotainment system control module

15 Steering column adjustment

16

Steering wheel heating

Fuse assignment - left footwell

lo} | He
ia i, L



. | Equipment

Engine ignition coils

Engine start

Electric motor coupling

Windshield wiper control module

Left headlight electronics

Climate control system blower

Instrument panel

Windshield wipers

OND)
OMA)
WININI]
eR
Panoramic glass roof

Fuse panel (2) (black)
No. Equipment

Engine mount


Left rear door control module

4N0012721BD
Fuses and bulbs


Windshield washer system/headlight
washer system

Right headlight electronics

Front seat heating

Right rear door control module

Sockets

Left front door control module

Parking heater



. | Equipment

Anti-theft alarm system

Engine control module

Horn

Parking brake

Gateway control module (diagnosis)

Interior headliner lights

Driver assist systems control module

Airbag control module

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

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

13) Climate control system

14 Right front door control module

15 Climate control system, body electronics

16 Brake system



13 | Radiator fan

14 | Engine control module

15 | Engine sensors


16 | Fuel pump

Fuse assignment - luggage compartment



Fig. 213 Luggage compartment: fuse panel with plastic
bracket


No. Equipment





Fus 1 |Thermal management
No. | Equipment 5 |Air suspension
2 |Engine components 6 |Automatic transmission
3 | Engine components 7 |Right rear seat adjustment
4 | Engine components 8 |Rear seat heating
5 | Brake light sensor 9 |Central locking, left tail light
6 |Engine components 10 | Front belt tensioner on driver's side
7 |Engine components 11 | Central locking, rear blind, fuel filler door
8 | Engine components 12 |Luggage compartment lid
9 | Engine components
10 | Oil pressure sensor, oil temperature sensor

bh BR Engine start

Bb N

Engine components


No. | Equipment

1 | Rear climate control system blower >

329

Fuses and bulbs






































Fuse panel @) (red) Fuse panel (4) (black)
3 | Exhaust treatment, sound actuator 8 | Night vision assist, active suspension
4 |Rear climate control system control panel 9 | Adaptive cruise assist
5 |Right trailer hitch light ll Intersection assistant, driver assist sys-
6 | Trailer hitch positioning motor tems
7 |Trailer hitch 12 | Exterior sound
8 |Left trailer hitch light 14 | Right headlight
9 |Trailer hitch socket 15 [Left headlight
10 | Sport differential Fuse panel (5) (red)
11 | Exhaust treatment No. | Equipment
Fuse panel (8) (brown) 1 |Active suspension
No. | Equipment 2 |Service disconnect switch
1 | Driver assist systems control module 3_ | Refrigerator
2 |Rear Audi phone box 4 | Electric motor
3 | Rear seat adjustment 5 | Brake system
4 |Side assist 6 |High-voltage battery water pump
5 | Rear seat entertainment 7 |Interior climate control
6 |Tire pressure monitoring system 8 |A/C compressor
7 | Emergency call system 9 | Auxiliary battery control module
g | Parking heater radio receiver, fuel tank 10 |High-voltage battery
monitoring 11 |High-voltage battery
9 |Automatic transmission selector lever 14 | Thermal management
10 |TV tuner, data exchange control module 15 | Thermal management
11 | Vehicle opening/start (NFC) Fuse panel © (white)
12 | Garage door opener No. Equipment
13 | Rearview camera, peripheral cameras 1 | Reamecenter armrest heanng
14 | Central locking, tail lights 2 | Rear sliding sunroof
15 | Left rear seat adjustment 3 | CD/DVD player
16 trent belt tensioner on front passenger's 5 lac socket
6 | Passenger’s side rear safety belt tensioner
Fuse panel (4) (black) 7 |Front center armrest heating
No. | Equipment 8 |Rear footrest heating
Seat ventilation, rear seat heating, rear- 11 |Rear Seat Remote
1 |viewsmirror,.cefrigerator, diagnostic:con- 12 |Driver’s side rear safety belt tensioner
nector
2 |Gateway control module (communication) Bulbs
3 |Sound actuator
4 | Transmission heating valve Cs
5 | Engine start, electric motor Your vehicle is equipped with maintenance-free
7 |Active accelerator pedal headlights and tail lights. However, if a light bulb >

330

Data privacy

Data privacy
Image recording
Surrounding area monitoring
Applies to: vehicles with surrounding area monitoring
Some vehicle functions require the vehicle’s path
to be detected and evaluated. This is done by
cameras installed permanently on the vehicle
that detect objects in the vehicle's surroundings
(such as obstacles or guard rails). The live images
from the cameras are transmitted to the applica-
ble control module.
The camera images are transferred to the respon-
sible control module for processing and may be
stored, depending on vehicle equipment. The
control
module analyzes the current camera im-
age using image evaluation software. This image
evaluation software detects anonymized techni-
cal measurements, such as distances to objects.
The control module evaluates these technical
measurements and makes it possible for the as-
sist systems to control the vehicle, if necessary.
Data memories
Vehicle control modules
rt 1 oO g|
= +
a


Fig. 214 Driver's side footwell: connection port for the On
Board Diagnostic System (OBD)
Your vehicle is equipped with electronic control
modules for various vehicle systems such as the
airbags. These vehicle control modules store data
while driving normally that is required by an au-
thorized Audi dealer or authorized Audi Service
Facility for diagnosis and repair purposes. Only
certain types of data are recorded for a very short
period of time if a control module has detected a
332

system event. No noises, conversations, or im-
ages will be recorded in the vehicle.
The data may include information such as the ve-
hicle speed, the direction of travel, and informa-
tion about the brake system, or also the behavior
of the restraint system in the event of an acci-
dent. The stored data can be exported and down-
loaded with special devices, which must be con-
nected directly to the vehicle.
On Board Diagnostic System (OBD)
There is a diagnostic connector socket in the driv-
er's side footwell to read out the various control
modules and the event data recorder. Data re-
garding the function and condition of the elec-
tronic control modules is stored in the event
memory. Only have an authorized Audi dealer or
authorized Audi Service Facility read out and de-
lete the event memory.

Z\ WARNING
— Incorrect use of the connection port for the
On Board Diagnostic System can cause mal-
functions, which can then result in accidents
and serious injuries.
— Only allow an authorized Audi dealer or au-
thorized Audi Service Facility to read out the
engine data.
(rune rie M-leelcel-1g
Event Data Recorder

This vehicle is equipped with an Event Data Re-
corder (EDR). The main purpose of an EDR is to
record, in certain crash or near crash-like situa-
tions,
such as an airbag deployment or hitting a
road obstacle, data that will assist in understand-
ing how a vehicle's system performed. The EDR is
designed to record data related to vehicle dynam-
ics and safety systems for a short period of time,
typically 30 seconds or less. The EDR in this vehi-
cle is designed to record such data as:
— How various systems in your vehicle were oper-
ating;
— Whether or not the driver and passenger safety
belts were buckled/fastened;