engine AUDI A8 2017 Repair Manual

Checking and Filling
Coolant addit iv e
The coolant additive is made of anti-freezing and
corrosion protection agents. Only use the fo llow­
ing coolant additives .
Coolant additive Sp ecification
G13 TL 774)
G12++ TL 774 G
These additives may be mixed with each other.
The amount of coolant additive that needs to be
mixed w ith water depends on the climate where
the vehicle will be operated . If the coolant addi­
tive percentage is too low, the coo lant can freeze
and damage the engine.
Coolant addi- Freeze protec-
tive tion
Warm regions min
. 40%,
min. -13 °F
max. 45% (-25 °C)
Cold regions min . 50%, max. -40 °F
max. 55% (-40
°C)
(D Note
-Before the start of winter, have your author­
ized Audi dealer or authorized Audi Service
F ac ility check if the coolant additive in you r
vehicle matc hes the percentage appropriate
fo r the clim ate. This is espe cially important
when driving in colder climates .
-If the appropriate coolant addi tive is not
available in an emergency, do not add any
other additive for risk of damaging the en ­
gine. If this happens, only use water and re­
store the correct mixture ratio with the
specified coolant additive as soon as possi­
ble.
- Only refill with new coo lant.
- Radiator sealant must not be mixed with
the coo lant.
278
Adding coolant
Fig. 261 E n g in e compartment: coolant expansion tank
cover
Observe the safety precautions ¢ .&. in Working
in the engine compartment on page 2 71.
Check ing the engine coolant level
.,. Park the vehicle on a level surface.
.,. Switch the ignit ion off.
.,. Read the coolant level on the coolan t expansion
tank
¢page 274. The coolant leve l must be be­
tween the M IN and MAX markings when the en­
gine in cold . When the engine is warm it can be
slightly above the MAX marking .
Adding coolant
Requirement: there m ust be a residua l amount of
coolant in the expansion t ank
~ CD.
.,. Let the engine cool down .
.,. Place a cloth
over the coolant expansion tank
cap and unsc rew the cap cou nte rclockw ise
~ .&. -
.. Add coolant mixed in the correc t ratio
~ page 277 up to the MAX marking.
.,. Make sure that the fluid level remains stable.
Add more coolant if necessary .
.,. Close the cap securely .
Coo lant loss usually indicates there is a leak . Im­
med iate ly 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 leak ing, a loss can come
from the coolant boiling through overheat ing
and being pushed ou t of the cooling system .

C)
_& WARNING
-The cooling system is under pressure. Do
not open the coolant expansion tank cap
when the engine is hot. This increases the
risk of burns .
- The coolant add itive and the coolant can be
dangerous to your health. For this reason,
keep the coolant in the original container
and away from children. There is a risk of
poisoning.
- When working in the engine compartment,
remember that the radiator fan can sw itch
on even if the ignition is switched off, which
increases the risk of injury.
CD Note
Do not add coolant if the expansion tank is
empty. Air could enter the cooling system and
damage the engine. If this is the case, do not
continue driv ing. See an authorized Audi deal­
er or authorized Audi Service Facility for assis­
tance.
Brake fluid
N
N
-N
" co IXl
F ig. 262 Engine compartment: cap on brake fluid re servoir
Observe the safety precautions c:> &. in Working
in the engine compartment on page 2 71.
Checking the brake fluid level
" Read the brake fluid level on the brake fluid
reservoir
c:> page 2 74, fig. 259. The brake fluid
level must be between the MIN and MAX mark­
ings
c:> &_ .
~ The brake fluid level is mon itored automatically .
" N ...... 0 0 :r Checking and Filling
Changing the brake fluid
Have the brake fluid changed regularly by an au­
thorized Audi dealer or authorized Audi Service
Facility.
A WARNING
-
- If the brake fluid level is below the MIN
marking, it can impair the braking effect
and driving safety, which increase the risk of
an accident . Do not continue dr iving. See an
author ized Audi dealer or author ized Audi
Service Facility for assistance.
- If the brake fluid is old, bubbles may form
in the brake system dur ing heavy braking.
This would impair braking performance and
driving safety, which increases the r isk of an
accident.
- To ensure the brake system functions cor­
rectly, only use brake fluids that comply
with VW standard 50114 or FM VSS -116 DOT 4.
CD Note
-If the brake f luid level is above the MAX
marking, brake f luid may leak out over the
edge of the reservoir and result in damage
to the vehicle.
- Do not get any brake fluid on the vehicle
paint, because it wi ll corrode the paint.
Battery
General warnings about batteries
Because of the complex power supply, all wo rk
on batter ies such as disconnecting, replac ing,
etc. should
only be performed by an authorized
Audi dealer or authorized Audi Service Fac il ity
c:> & .
The term "vehicle battery" refers to the 12 Volt
battery in your vehicle.
Detailed warnings for the vehicle battery:
® Wear eye protection.
I.)._ Bat~ery acid is highly corrosiv~. Wear pro-
~ tect1ve gloves and eye protection. Ill-
279

0 co .... N ,..... N .... 0 0 :c ' ~ Clamp the charger terminal clamps to the jump
start pins according to the instructions. (pin un­
der the cover= "pos it ive", pin with hexagonal
head
= "negative").
~ 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 cab le out of the
socket.
~ Now remove the charg ing device terminal
clamps.
~ Close the cover @on the positive terminal and
re-install the cover
(D.
~ Close the hood c:> page 2 73.
A drained battery can freeze at temperatures
around 322F (OQC). A frozen or thawed out bat­
tery must no longer be used. The battery housing
could be cracked by the formation of ice, which
could cause battery acid to leak out
c:> A .
Charg ing the b att ery
On ly use chargers with a ma ximum cha rg ing
voltage of 14.8 V. The battery connecting cables
do not need to be disconnected. Do not open the
battery when charg ing .
Read a ll of the manufact urer 's instructions for
the charger before charging the battery.
A WARNING
- A highly exp losive mixture of gases can form
when charging batter ies. Only charge the
vehicle battery in well-vent ilated areas.
- A drained battery can freeze at tempera­
tures around 32 °F (0 °C). A frozen or
thawed ve hicle battery must not be charged
and must not be used anymore. The battery
housing can crack and battery acid can leak
o ut if ice fo rms, wh ic h in creases the r is k of
an exp losion and chemica l burns. Conta ct an
au thori zed Aud i dealer o r autho rized Aud i
Service Facility fo r mo re information.
- Do not connect o r disconnect the charg ing
cable while charg ing because th is increases
the risk of an exp losion.
Ch eck ing and Filling
{!) Tips
-Only charge the vehicle battery through the
connect ions in the engine compartment.
- Read all of the manufacturer's instructions
for the charger before charging the vehicle battery.
Windshield washer system
F ig . 2 64 Engine compartmen t: was her fluid reservo ir cap
M N ~ N
"' co m
The windshield washer fluid reservoir O contains
the cleaning solution for the w indshield and the
headlight washer system¢
fig. 264, ¢ page 2 74.
The reservoir capacity is found in c:> page 334 .
To reduce the risk of lime scale deposits on the
spray nozzles, use clean water with low amo unts
of calcium. Always add window cleaner to the wa­
ter. When the outside temperatures are cold, an
anti-freezing agent should be added to the water
so that it does not freeze .
(D Note
-The concentration of ant i-freez ing agent
must be adjusted to the veh icle operat ing
conditions in the respective climate . A con­
centration that is too high can lead to vehi­
cle damage.
- Never add radiator anti-free ze or other addi­
tives to the washer fluid.
- Do not use a glass cleaner that con ta ins
pai nt so lvents, because t his could damage
t he paint.
281

Checking and Filling
Service interval display
The service interval display detects when your ve­
hicle is due for service.
The service interval display works in two stages:
-Inspection or oil change reminder: after a cer-
tain distance driven, a message appears in the
instrument cluster display each time the igni ­
tion is switched on or off . The remaining dis­
tance or time is displayed briefly.
- Inspection or oil change due: if yo ur vehicle
has reached an inspection or oi l change interval
or both intervals at the same time, the mes­
sage
Inspection due! or Oil change due! or Oil
change and inspection due!
appears briefly af­
ter switching the ignition on/off .
Checking service intervals
You can check the remaining distance or time un­
til the next oil change or next inspection in the
Car menu. To do this, select : the
ICARI function
but ton
> Car systems control button > Servicing
& checks > Service intervals .
Resetting the indicator
Your authorized Audi dealer or authorized Audi
Serv ice Facility will reset the serv ice interval dis­
p lay after performing serv ice.
If you have changed the oil yourself, you must re­
set the oil change interva l.
To reset the indicator, select : the
ICARI function
button
> Car systems contro l button > Servicing
& checks > Service intervals. Turn the control
knob downward to
Reset oil change interval and
press the control knob.
([) Note
-Only reset the oil change indicator if the oil
was changed .
- Following the service intervals is critical to
maintain ing the service life and va lue of
your vehicle, especially the engine. Even if
the m ileage on the vehicle is low, do not ex­
ceed the time for the next service.
282

tires according to the load and
the size of the tires installed .
Wheels
Tire pressure
Model/ Tire designation Normal load Maximum load
Engine (up to
2*/3 people)al
front rear front rear
PSI kPA PSI kPA PSI kPA PSI kPA
A8/A8 L: 235/55 Rl8 104H
35 24
0 30 210
36 250
38 260
3.0L
255/45 Rl9 104H 35 240 30 210 36 250 38 260
6 cylinders 265/40 R20 104H 35 24
0
30 21
0
36 2
50
38 26
0
265/40 R20 104V 35 240 30 210 33 230 35 240
265/35 R21 101 Y 38 260
35 240 36 250
38 2
60
275/35 R21 103V 35 240 30 210 36 250 35 240
AS/ASL: 235/55 Rl8 104H 36 250 30 210 38 260 38 2
60
4.0L
255/45 Rl9 104H 36 250 30 210 38 260 38 260
8 cylinders 265/40 R20 104H 36 250 30 210 38 260 38 260
265/40 R20 104V 36 250 30 210 35 2
40
35 2
40
275/35 R21 103V 36 250 30 210 38 260 38 260
58: 265/40 R20 104V 36 250 3 0 21 0 39 27
0
38 260
4.0L 265/35 R21101 Y 39 270 33 230 44 300 42 290
8 cylinders 275/35 R21103Y 36 250 30 210 44
300 4
2
29 0
58 plus: 265/40 R20 104V 38 260 32 220 39 270 38 260
4.0L
275/35 R21 103V
8
cylinders 45 310 39 270 49 340 48 330
a ) Vehicles with 4 seating positions: two people in the front, Vehicles with 5 seating
positions:
two people in the front , one person in the rear
A WARNING
Please note the important safe­
ty precautions regarding tire pressure
¢ page 293 and load
limits
¢ page 295.
Tires and vehicle load limits
There are limits to the amount of
~ load or weight that any vehicle that is
overloaded will not handle
well and is more difficult to stop .
Overloading can not only lead to
loss of vehicle control, but can al­
so damage important parts of the
vehicle and can lead to sudden
tire failure, including a blowout
and sudden deflation that can
cause the vehicle to crash.
N
~ and any tire can carry. A vehicle
0 0 :c ' Your safety and that of your pas­
sengers also depends on making ..,.
295

Wheels
@ For the sake of the environment
Low tire pressure inc reases fuel consumption
and tire wear.
@ Tips
- The pressure of the spare tire * is not moni ­
tored.
- If t ires are re pla ced, the sensors/valves do
not need to be removed or rep laced . Ju st re­
placed the valve stem and, if necessary, the
valve and the wheel e lectron ics . If you have
quest ions, see your autho riz ed Aud i dea ler
or authorized Audi Service Facility.
Displaying tire pressures/temperatures
App lies to : 58 plus
Req uirement: the ign ition must be switched on .
.,. Select : the
ICARI function button > C ar s ystems
> Serv icing & checks > Tire pressure mon itor ­
ing
> Display tire pressures.
The current tire pressures are shown in green and
yellow numbers in the Infotainment system:
- Green : the current tire pressure and the speci­
fied tire pressure are approximately the same .
-Yellow: the c urrent tire press ure is too low
compared to the specified tire pressure.
The spe cified t ire press ure is the la st tire pres­
sure th at was s tored
c::> page 305.
No te that the tire pressure also depends on the
t emperature of the ti re . The ti re pressu re in­
creases as the engine becomes wa rmer wh ile
d riving.
& WARNING
R ea d and follow t he important information
and notes
c::> page 303 .
@ Tips
The tire pressure or tem per ature are not dis­
pl ayed in ada ptation mode. D ashe s·-.·- are
shown i n place of the press ure and tempera ­
ture .
304
-
Tire pressure loss
Applies to: 58 plus
Fig. 2 70 Dis pla y: ind icator light w it h a mess age
If the [I] ind icator light turns on, the pressure in
at least one tire is too low or new sensors were
not adapted:
RE indicator light s turn s on after turning the
ignition on
The tire pressure is too low compared to the
spec ified press ure .
.. Check and store the tire press ure(s) the next
time it is possible
c::> page 305.
RE indicator light turns on while dr iving
Wheels with new sensors we re not adapted or
the tire p ressure has reached a critica l level com­
pared to the specif ied pressure.
.. Avoid unnecessary s teering and brak ing maneu-
vers .
.. Adapt your driving sty le to the s ituation.
.. Stop as soon as possib le and check the tire(s).
.. If it is possib le to cont inue dr iv ing, see an au-
thorized Audi dealer or authorized Audi Service
Facility immediately and have your tire(s) re ­
pai red or rep laced .
& WARNING
Read and f ollow the impo rtant inform ation
and notes
c::>p age 303.
-

0 co .... N ,..._
N .... 0 0 :c ' use the hex head, potentially causing an ac­
cident.
- The factory-supplied jack is intended only
for your vehicle model. Under no circum­
stances should it be used to lift heavy
vehicles or other loads; you r isk injuring
yourself .
- Never start the engine when the vehicle is
ra ised, which could cause an accident.
- Support the veh icle secure ly with appropri­
ate stands if work is to be performed under­
neath the vehicle; otherwise, there is a po ­
tent ial risk for injury .
- Never use the jack supplied with your Audi
on anothe r vehicle, particularly on a heav ier
one . The jack is only suitable for use on the
vehicle it came w ith.
(D Tips
The vehicle jack* in your vehicle is mainte­
na nee-free.
Replacing wheels
Before changing a wheel
Observe the following precautions for your own
and your passenger's safety when changing a
wheel .
.,. After you experience a tire fail ure, pull the car
well away from moving t raff ic and try to reach
le vel ground before you stop¢,&. .
.,. All passengers should
lea ve the ca r and move
to a safe location (for instance, behind the
guardrail) ¢,&. .
.,. Engage the
parking brake to prevent your vehi­
cle from rolling unintentionally¢,&. .
.,. Move
sel ecto r le ve r to pos it ion P ¢ ,&. .
.,. If you a re towing a trailer, unh itch the trailer
from your veh icle.
.,. Take the
jack and the s pare tir e out of the lug ­
gage compartment
¢ page 312.
WARNING
You or your passengers co uld be injured while
chang ing a wheel if you do not follow these
safety precautions:
Em ergenc y ass is tanc e
-If you have a flat tire, move a safe distance
off the road. Turn off the eng ine, turn the
emergency flashers on and use other warn­ ing dev ices to alert other motorists .
- Make sure that passengers wait in a safe
p lace away from the vehicle and well away
from the road and traff ic .
- To help prevent the veh icle from moving
suddenly and possib ly slipping off the jack,
always fully set the park ing brake and block
the wheel d iagonally opposi te the wheel be­
ing changed. When one front whee l is lifted
off the groun d, p lacing the Automatic
Transmission in "P" (Park) w ill
not prevent
the vehicle from mov ing.
- Before you change a wheel, be sure the
g round is leve l and firm. If necessary, use a
sturdy board under the jack .
- Always s tore the vehicle tool kit, the jack
and the replaced tire in the luggage com­
partment
r::> page 213 .
(D Tips
Befo re c hanging the w heel, you must activate
t he jacking mode, so that the a utomat ic co n ­
tro ls for the Adaptive Air Suspension do not
make it more difficult to lift the vehicle with
the jack
¢ page 315.
Changing a wheel
When you change a wheel, follow the sequence
described below step-by-step and in exactly that
order .
1. Activate the vehicle jack mode ¢ page 315 .
2. Remove the decorative wheel cover *. For
more detai ls see also
r:::> page 314, Decora­
tive wheel covers
or ¢ page 314, Wheels
with wheel bolt caps.
3. Loosen the wheel bolts r:=> page 315 .
4. Locate the proper mounting point for the
jack a nd align the jack below that point
r:::> page 315 or ¢page 316.
5. Raise the ca r wi th the jack ¢ page 315 or
r:::> page 316 .
6. Remove the whee l with the flat tire and then
insta ll
the spare r:::>page 318 . IJII>
313

C) C0 ....
"' " "' .... 0 0 :r Driver's side cockpit fuse assignment
Fig. 287 Driver side cockpi t: fuse panel with plastic bracket
Fuse panel @ (brown)
No. Equipment
1 Light switch
2 Eme rgency start coil (driver identification)
3 Left rear door control module
4 Head-up display
5 Horn
6 Interior lights (headliner)
Steering column lever, multifunction
8 steering whee l controls, steering wheel
heating
10 Power steering column adjustment
11 Driver door control module
12 Diagnostic connector, light/rain sensor
14 Power steering column adjustment
lS Power steering, A/C compressor
16 Brake booster
Fuse panel © (black)
No. Equipment
1 Front seat heating
2 Windshield wipers
Fuses and bulbs
Fuse panel © (black)
3
Front exterior lighting
4 Sliding/tilting sunroof
s Driver power window
6 Driver's seat (pneumat ic)
7 Panorama roof
8 Dynamic steering
9 Front exterior lighting
10 Windshield/headlight washer system
11 Left rear power window
12 Panorama roof
Front passenger side cockpit fuse
assignment
Fig. 288 Fro nt passenger side cockpit: fuse panel with
plastic bracket
Fuse panel @ (black)
No. Equipment
1 Anti-theft alarm system
2 Transmission control module
3 Front climate control fan
4 Engine supply
6 Engine control module
7 Front passenger door control module
323

Fuses a nd bul bs
Bulbs
Replacing light bulbs
For your safety, we recommend that you have
your authorized Audi dealer replace burned out
bulbs for you.
It is becoming increasingly more and more diffi­
cult to replace vehicle light bulbs since in many
cases, other parts of the car must first be re­
moved before you are able to get to the bu lb .
This applies espec ially to the light bulbs in the
front of your car wh ich you can only reach
through the engine compartment .
Sheet metal and bulb holders can have sharp
edges that can cause ser ious cuts, and parts
m ust be correctly taken apa rt and then p roperly
put back together to help prevent breakage of
parts and long term damage from water that can
enter housings that have not been properly re­
sealed.
For your safety, we recommend that you have
your authorized Audi dealer replace any bu lbs for
you, since your dealer has the proper tools, the correct bulbs and the expertise.
G as di sc harg e l am ps (Xe non li ghts):
Due to the high electrical voltage, have the bulbs
replaced by a qua lified technic ian . Headlights
with Xenon light can be identified by the high
voltage sticker.
LED headlights* require no maintenance. Please
contact your authorized Aud i dealer if a bulb
needs to be replaced.
A WARNING
Contact w ith high-voltage components of the
electrical system and improper rep lacement
of gas discharge (Xenon) headlight bulbs can
cause serious personal injury and death.
- Xenon bulbs are pressurized and can ex­
plode when being changed.
- Changing Xenon lamps requires the special training, instructions and equipment.
- Only an a uthorized Audi dea ler or other
qualified workshop should change the bulbs
in gas discharge lamps .
326
A WARNING
-
There are parts with sharp edges on the open-
ings and on the bulb holders that can cause
serious cuts.
- If you are uncertain about what to do, have
the work performed by an authorized Audi
dealer or other qualified workshop. Ser ious
pe rsonal injury may resu lt from improperly
pe rformed wor k.
@ Tips
- If you must replace the light bulbs yourself,
always remember that the eng ine compart­
ment of any vehicle is a hazardous area to
work in. Always read and heed all WARN­ INGS
'* page 271.
-It is best to ask your authorized Audi dealer
whenever you need to change a bulb.

0 co .... N ,..... N .... 0 0 :c ' Emergency situations
General
This chapter is intended for trained emergency
crews and working personnel who have the nec­
essary tools and equipment to perform these
ope rations.
Starting by pushing or
towing
CD Note
Veh icles with an automatic transmission can­
not be started by pushing or towing.
Starting with jumper
cables
If necessary, the engine can be started by con­
necting it to the battery of another vehicle.
If the engine shou ld fail to start because of a dis ­
charged or weak battery, the battery can be con­
nected to the battery of
another vehicle, using a
pair of jumpe r cables to start the engine.
Jumper cables
Use only jumper cables of suffic iently large cross
section
to carry the starter current safely. Refer
to the manufacturer's specifications.
Use only jumper cables with
insulated term inal
clamps which are dis tinct ly marked:
plus (+) cable in most cases colored re d
minus( -) cable
in most cases colored black.
A WARNING
Batteries contain electricity, acid, and gas.
Any of these can cause very serious or fatal in­
jury. Follow the instructions below for safe
handling of your vehicle's battery.
- Always shield your eyes and avo id leaning
over the battery whenever poss ible.
- A dead battery can freeze at temperatures
around 32 °F (0 °C). If the vehicle battery is
frozen, you must thaw it before connecting
the jump start cab les. If you do not, this in-
Emergency situations
creases the risk of an explosion and chemi­
cal burns. After jump starting the vehicle,
drive to an authorized Aud i dealer or author­
ized Audi Service Facility immediately to
have the vehicle battery checked.
- Do not allow battery ac id to contact eyes or
skin . Flush any contacted area with water
immed iately.
- Improper use of a booster battery to start a
veh icle may cause an explosion .
- Veh icle batteries generate explosive gases.
Keep sparks, flame and lighted cigarettes
away from batter ies.
- Do not try to jump start any vehicle with a
low acid level in the battery .
- The voltage of the booster battery must also
have a 12-Volt rat ing. The capacity (Ah) of
the booster battery should not be lower
than that of the discharged battery. Use of
batter ies of different voltage or substantial­
ly different "Ah" rating may cause an exp lo­
sion and personal injury.
- Never charge a frozen battery. Gas trapped
in the ice may cause an explosion.
- Never charge or use a battery that has been
frozen . T he battery case may have be weak­
ened.
- Use of batteries of different voltage or sub­
stantially different capacity (Ah) rating may
cause an exp losion and injury . The capacity
(Ah) of the booster battery should not be
lower than that of the discharged battery.
- Before you check anything in the engine
compartment, always read and heed all
WARNINGS
qpage 271.
CD Note
-App lying a higher voltage booster battery
wi ll ca use expensive damage to sensitive
electronic components, such as control
units, relays, radio, etc.
- There must be no electrical contact between
the vehicles as otherwise current could al­
ready start to flow as soon as the positive
(+) terminals are connected.
327