lock AUDI A8 2016 Repair Manual

Fuel and Refueling
nozzle. A worn or damaged nozzle or a noz ­
zle that is too small may not be ab le to open
the diesel m isfueling protector. If th is is the
case, try turning the nozzle before inserting
i t in the fuel f iller neck, use a different fuel
pump or see your authorized Audi dealer or
authorized repair facility for ass istance.
- The fuel filler flap of your vehicle is not
locked when you lock the veh icle from the
i nside .
Fuel filler flap emergency release
You can open the fuel filler flap by hand if the
power locking system should fail.
F ig . 190 Vehicles w ith se lect ive cata lytic reductio n: Right
side tr im pane l
Fig. 191 Right side trim panel in the lu ggage compart ·
ment: e mergency release mechan is m
...,
"' 9 ::i: ... (D
The emergency release mechanism is located be­
hind the right side trim panel in the luggage
compartment. In vehicles with selective catalytic
reduction*, remove the vent grille first :
.. Press both tabs@¢
fig. 190 and tilt the vent
gri lle downward. You can then remove the
grille upward.
.. Loosen the loop¢
fig. 191 from the retainer
and then pull on the loop carefully ¢(D.
216
.. Press on the left side of the fuel filler door to
open
¢ page 214, fig. 188.
(D Note
Only pull on the loop until you feel resistance .
You wi ll not hea r it re lease . Otherwise you
could damage the emergency release mecha­ nism.
Selective catalytic reduction (Ad Blue)
General information
Applies to: vehicles with selective catalytic reduction (SCR)
In vehicles with selective catalytic reduction, a
urea solution (AdBlue) is injected into the ex­
haust system before a nitrogen oxide catalytic
converter to reduce nitrogen emissions .
The Ad Blue is carried in a separate tank in the ve­
hicle. The AdBlue usage accounts for approxi­
mately 0.5% to 1.2% of the diesel fuel that is
used.
When a message about Ad Blue appears in the in­
strument cluster display, you must refill the
Ad Blue yourself or have it refilled by an author­ ized Audi dealer or author ized Audi Service Facili­
ty
¢ page 217.
@ Tips
-The instrument cluster display indicates the
distance remaining that can be driven
¢page 216. If the AdBlue tank is com­
pletely empty , the eng ine will not start
again after the ign ition is switched off.
- Ad Blue is required by law to operate th is ve­
hicle.
Messages in the instrument cluster display
Applies to: vehicles with selective catalytic reduction (SCR)
The display indicates if the Ad Blue level is Low or
if there is a system malfunction .
AdBlue level low
You will be informed if the AdBlue in the tank
drops below a certain level.

Fuel and Refueling
Ad Blue tank. If the wrong fluid is filled in
the tank, do not start the engine under any
circumstances. If yo u do, you risk damaging
the tank system and the engine. See an au ­
thorized Audi dealer or authorized Audi
Service Fac ility for assistance .
- AdBlue attacks surfaces such as painted ve­
hicle components, plastic and carpet. Re­
move the fluid as quickly as poss ible with a
damp cloth and plenty of cold water. If the
Ad Blue has already crysta llized, use wa rm
water and a sponge. Ad Bl ue residue that is
not removed will crystallize and can damage
the affected surface.
- Do not store refill bott les or canisters per­
manently in the vehicle . If the container
l eaks, the escaping AdBlue could damage
the vehicle interior.
- Do not allow AdBlue to come into contact
with clothing. If there is contact with the
flu id, f lush immed iate ly w ith plenty of wa­
ter.
(D Tips
Follow the Ad Blue manufacturer's instruc ­
tions for use and storage .
Refilling Ad Blue with a bottle
Applies to: veh icles w ith selective catalyt ic reduction (SCR)
"'Remove the cap from the refill bottle c> A in
Filling Ad Blue on page 217,
¢ @) in Filling
AdBlue on page 21 7.
"' Pos ition the bottle on the filler tube and turn
the bottle clockwise until it stops turning .
"'Pr ess lightly against the bottom of the bottle
to empty it. Continue press ing the bottom of
the bottle until it is empty or until fluid stops
flowing into the tank.
"' Remove the bottle and close the filler neck
c> page 219, Completing AdBlue refill .
(D Note
Only use refill bottles that are approved for
your vehicle. Using other systems can cause
Ad Blue to leak.
218
(D Tips
-You can obtain refi ll bott les from an author­
ized Aud i dea ler or authorized Audi Service
Facility.
- A permitted refill bottle contains approxi­
mately 0.5 gallon (1.9 liters) of AdBlue.
· Refilling Ad Blue with a canister
App lies to : vehicles with selective cata lyt ic r educt ion (SCR)
®
+®
Fig. 193 Canis te r w ith attachab le hose
N ::> "' Remove the cover on the refill canister¢ A in
Filling AdBlue on page 217, ¢(Din Filling
AdBlue on page 217.
"' Secure the end of the hose (Don the opening in
the canister @by turn ing the hose to the right.
"' Remove the cap @from the other end of the
hose @.
"' Posit ion the end of the hose @on the filler
neck in the vehicle and turn the hose to the
r ig ht to tighten it.
"' Lift the canister up and then tip it. Continue
holding the canister in a tipped position until it
is empty or until no more fluid flows into the
tank.
"' Remove the canister and close the filler neck
¢ page 219, Completing AdBlue refill.
(D Note
Only use refill canisters that are approved for
your vehicle. Using other systems can cause Ad Blue to leak .
0) Tips
-An authorized Audi dealer or authorized
Audi repair facility can tell you which refill
canisters are approved for your vehicle .

-A permitted refill canister contains approxi ­
mately 1.3 gallons (5 liters) of Ad B lue .
Completing AdBlue refill
Applies to: veh icles with selective catalyt ic reduction (SCR)
Cl os ing the fill er ne ck
~ Turn the Ad Blue cap to the r ight on the fill er
tube unti l the cap clicks into place ¢
A in Fill­
ing Ad Blue on page 217,
¢ CD in Filling Ad Blue
on page 217 .
~ Then press on the left side of the tank door un -
t il you hear it lock.
After filling
T he vehicle must be driven so that the system
recogni zes th at the Ad Blue was refilled. Th is
process can take several minutes.
~ If there was no Ad Blue left in the tank and a
range of
O m i (0 km ) was shown in the display,
switch the ign ition on for about 30 seconds be­
fore starting the engine.
Ad Blue can freeze at very low temperatures. If th is happens, the system will not detect
that the Ad Blue was refilled and it wi ll contin ­
ue to inform yo u of the low Ad Blue level. The
message turns off as soon as the tank thaws
out again .
Fuel and R efueling
219

-Do not remove the engine cover under any
circumstances. This increases the risk of
burns.
- If work on the fuel system or the electrical
system is necessary:
- Always d isconnect the battery.
- Never smoke or work near heaters or open
flames. Flu ids in the engine compartment
could start a fire.
- Keep an app roved fire ext inguisher imme­
d iate ly availab le.
- To avo id electr ical shock and personal injury
wh ile the eng ine is running or being started,
never touch:
- Ignition cables
- Other components of the high voltage
electronic ignition system.
- If you must perform a check or repa ir with
the engine running:
- First, fully apply the parking brake, move
selector lever to "P" (Park).
- Always use extreme caution to prevent
cloth ing, jewelry, or long hair from get­
ting caught in the radiator fan, V-belts or
other mov ing parts, or from contacting
hot parts. Tie back ha ir before starti ng,
and do not wear clothi ng that will hang or
d roop into t he engine.
- Min imize exposu re to emission and chem i­
cal hazards¢ .&.-
_& WARNING
California Proposition 65 Warn ing:
- E ngine exhaust, some of its constituents,
and certain vehicle components contain or
em it chem ica ls known to the St ate of C ali­
f orn ia to cause cancer and bi rth de fects and
reproductive harm . In addition, certain flu­
ids contained in ve hicles and certain prod­
ucts of component wear contain or emit
Ch eck ing and Filling
chemicals known to the State of California
to cause cancer and birth defects or other
reproductive harm.
- Battery posts, term inals and related acces­
sories contain lead and lead compounds,
chemicals known to the State of Californ ia
to cause cancer and reproductive harms.
Was h hands afte r handling .
([) Note
When adding flu ids, always make sure that
they are poured into the proper co nta iner or
fille r opening, otherwise serious damage to
vehicle systems w ill occur.
® For the sake of the environment
To detect leaks in time, inspect the veh icle
floor pan from unde rneath regularly . If you
see spots from oil or other veh icle fluids, have
your vehicle inspected by an authorized Audi
dealer.
Closing the engine hood
.,.. Pull the hood down un til the press ure from the
struts is reduced.
.,.. Let the hood
drop down and latch in p lace . Do
not try to push it shut;
it may fail to engage
¢ _& .
_& WARNING
--A hood that is not completely latched co uld
fly up and block your view while driv ing.
- When you close the engine hood, check it to
make sure the safety catch has properly en­
gaged . The hood s hou ld be flush with the
sur rounding vehicle body parts.
- If you notice while driv ing that the hood is
not secured properly, stop at once and close
it.
-
221

Checking and Filling
the engine is warm, the level may be slightly above the "max" marking.
The location of the coolant expansion tank can be
seen in the engine compartment illustration
¢ page 222.
To obtain an accurate reading, the engine must
be switched off.
The expansion tank in your vehicle is equipped
with an electric coolant level sensor.
When the coolant level is too low, the warning
light in the Auto-Check System¢
page 15 will il­
luminate until you add coolant and the level has
been restored to normal. Even though there is an
electric coolant level sensor, we still recommend
you check the coolant level from time to time .
Coolant loss
Coolant loss may indicate a leak in the cooling
system . In the event of coolant loss, the cooling
system should be inspected immediately by your
authorized Audi dealer.
It is not enough merely
to add coolant.
In a
sealed system, losses can occur only if the
boiling point of the coolant is exceeded as a re­
sult of overheating.
_& WARNING
The cooling system is under pressure and can
get very hot. Reduce the risk of scalding from
hot coolant by following these steps.
- Turn off the engine and allow it to cool
down.
- Protect your face, hands and arms from es­
caping fluid and steam by covering the cap
with a large, thick rag.
- Turn the cap slowly and very carefully in a
counter-clockwise direction while applying
light, downward pressure on the top of the
cap.
- To avoid being burned, do not spill anti­
freeze or coolant on the exhaust system or
hot engine parts. Under certain conditions,
the ethylene glycol in engine coolant can
catch fire.
228
(D Note
Do not add any type of radiator leak sealant
to your vehicle's engine coolant. Adding radia­
tor repair fluid may adversely affect the func­
tion and performance of your cooling system
and could result in damage not covered by
your New Vehicle Limited Warranty .
Adding coolant
Be very careful when adding engine coolant.
Before you check anything in the engine compart­
ment,
always read and heed all WARNINGS
¢.& in Working in the engine compartment on
page 220 .
.. Requirement: There must be a residual amount
of coolant in the expansion tank ¢(D .
.. Turn off the engine .
.. Let the engine cool down .
.. Place a thick rag over the coolant expansion
tank ¢
page 22 7, fig. 201 and carefully twist
the cap counter-clockwise ¢&, .
.,. Add coolant mixed in the correct ratio
r::!> page 22 7, Coolant up to the MAX marking.
.. Make sure that the fluid level remains stable.
Add more coolant if necessary .
.. Twist the cap on again
tightly.
Replacement engine coolant must conform to ex­
act specifications ¢
page 22 7, Coolant.
We recommend using only coolant additive G12+
+, G13 or in an emergency G12+ . Do
not use a
different additive. In an emergency use plain wa­
ter until you can get the correct additive and can
restore the correct ratio. This should be done as
soon as possible.
If you have lost a considerable amount of cool­
ant, then you should add cold antifreeze and cold
water only when the engine is cold.
Always use
new engine coolant when refilling.
Do not fill coolant above the "MAX" mark . Excess
coolant will be forced out through the pressure
relief valve in the cap when the engine becomes
hot.
~

& WARNING
-The cooling system is under pressure and
can get very hot. Reduce the risk of scald ing
from hot coolant by following these steps.
- Turn off the engine and allow it to coo l
down.
- Protect your face, hands and arms from
escaping flu id and steam by cover ing the
cap w ith a la rge, thick rag.
- Turn the cap slowly and very carefully in a
counter-clockwise d irection while applying
light, downward p ressure on t he top of
the cap.
- T o avoid bei ng bu rned, do not spill anti­
free ze or coo la nt on the e xhaust sys tem or
hot engi ne parts. Under certa in cond i­
tions, the ethylene glycol in eng ine cool ­
ant can catch fire .
- An tifreeze is poisonous. Always store anti­
freeze in its original con tainer and well ou t
of the reach of children.
- If you dra in the coolant, it m ust be ca ught
and safely stored in a proper conta iner
clearly marked "poison" .
(D Note
-Do no t add coolant if the expa nsion tank is
empty. Air cou ld enter the cooling sys tem
and damage the eng ine. If this is the case,
do not continue driving. Seek professional
ass istance.
- Coolant po llutes the environment and could
ca use an eng ine fire . Excess coolant will be
fo rced o ut through the pressure relief valve
i n the cap when the eng ine becomes hot.
- If, in an emergency, only wate r can be add­
ed, the correct ratio between water and an­
tifreeze¢
page 22 7 must be restored as
soon as possib le.
@) For the sake of the environment
Drained coolant sho uld not be reused. Always
dispose of used coolant while observing all
,...,
"' environmental regulat io ns. 0 J:
'SI: ,..., -
Ch eck ing and Filling
Rad iator fan
The radiator fan switches on automatically by it­
self .
The radiator fan is driven by the engine via the V­
belt. The v iscous clutch regulates t he speed of
the fan accord ing to the temperature of the cool­
ant .
An auxiliary e lectr ic radiator fan* sw itches on and
off depend ing o n coo lant temperature and other
vehicle operating conditions.
After you switch the engine off, the auxiliary fan
can continue ru nning for up to 10 m inutes -even
with the ignition off. It can even switch on aga in
later by itself¢,& , if
- the temperature of the engine coolant rises due
to the heat build-up from the engine in the en­
gine compartment, or
- the engine compartment heats up beca use the
veh icle is parked in intense sunlight.
& WARNING
- To reduce the r isk of persona l injury neve r
touch the radia to r fan .
- The auxiliary e lectr ic fan is temperature
controlled and can switch on s uddenly even
when the engine is not ru nning .
- The a uxiliary radiator fan sw itches on auto­
mat ically when the eng ine coolant reaches a
certa in temperature a nd will continue to run
until the coolant temperature d rops.
229

Checking and Filling
Brake fluid
Checking brake fluid level
The brake fluid level can be checked with a quick
glance.
Fig. 202 Eng ine compartment: cove r o n th e brake flu id
r eservoi r
Before you check anything in the engine compart­
ment,
always re ad a nd hee d all W ARNING S
¢ A in Working in the engine compartment on
page 220.
., Read the brake fluid level from the brake fluid
reservoir
<=> fig . 202, ¢page 222. The brake flu ­
id level must be between the "MIN" and "MAX"
mark ings.
The location of the brake fluid reservoir can be seen in the engine compartment illustration
¢ page 222.
The fluid level may drop slightly after some time
due to the automatic adjustment of the brake
pads . This is not cause for alarm .
If the brake fluid level falls
considerably below
the ' 'MIN" mark, the brake warning/indicator
light
1111 (U.S. models)/ . (Canadian models)
will come on¢
page 14 . Do not continue to oper­
ate the vehicle . The complete brake system
should be thoroughly checked by an authorized
Aud i dealer or other q ualified facili ty and the
cause corrected.
If the brake f luid level is too
low, the brake warning/indicator light will i llumi ­
nate. Contact an authorized Audi dealer
immedi­
at ely.
230
Changing brake fluid
Have the brake fluid changed by an experienced
technician .
Brake fluid absorbs moisture from the air. If the
water content in the brake fluid is too high, cor­ rosion in the brake system may result after ape­
riod of time . The boiling po int of the brake fluid
will a lso decrease considerably and decrease
braking performance.
Therefore , the brake fluid must be changed
eve ry
two y ears . Always use new brake fluid which con­
forms to Feder-al Motor Vehicle Standard "FMVSS 116 DO T 4".
The brake fluid reservoir can be difficult to reach ,
therefore, we recommend that you have the brake fluid changed by your author ized
Audi
d ea ler . Your dealer has the correct tools, the
right brake fluid and the know -how to do this for
you.
A WARNING
- Brake fluid is po isonous. It must be stored
only in the closed original container out of
the reach of children!
- Brake fai lure can result from o ld or inappro­
priate brake fluid . Observe these precau­
tions:
- Use only brake fluid that meets SAE speci­ ficat ion
J 1703 and conforms to Federal
Motor Ve hicle Standard 116. Always check
with your authorized Audi dealer to make
sure you are using the correct brake f luid .
The correct type of brake f luid is also indi­
cated on the brake fluid reservoir.
- The brake fluid must be new . Heavy use of
the brakes can cause a vapor lock if the
brake fluid is left in the system too long .
This can seriously affect the efficiency of
the brakes as well as your safety. This
could result in an accident.
(D Note
Brake fluid will damage the paint of your vehi-
cle .
lilJJ,

Wheels
Snow chains not only improve the driving in win­
ter road conditions, but also the broking.
Use of snow cha ins is o nly pe rm itted with certain
r im/t ire combinations due to tec hni cal reasons.
Check with an authorized Audi dealer or author­
ized repair faci lity to see if yo u may use snow
cha ins .
The snow c ha ins must have
low-profile lin ks and
m ust not be thicker than 0 .4 inch (10.S mm), in ­
cluding the lock.
You mus t remove the c hains whe n driving on
roads that are
free of snow. When roads are free
of snow, snow c hains can impair handling and
damage the tires, and the chains wi ll quickly be
destroyed .
_& WARNING
Using inco rrect snow chains or insta lling snow
chains incorrectly can result in loss of vehicle
cont rol, which inc reases the risk of an acc i­
dent .
{CT) Note
-Snow cha ins can damage the rims/wheel
covers* if the chains come into d irect con­
tact with them . Remove the wheel cove rs*
first. Use coated snow chai ns.
- Using snow chains that add more than 0.4
inch (10.5 mm) of he ight can severely dam­
age the wheel hous ings and other vehicle
components.
- Do not i nstall and use snow chai ns if there is
a malfunct ion in the adaptive air suspen­
s io n, because the vehicle he igh t will be very
l ow. If you drive wi th snow ch ains anyw ay,
the wheel ho usings and other vehi cle com ­
ponen ts can be severely damaged .
(D Tips
When using snow chains, it m ay be useful t o
sw itch on sport mo de
¢page 192.
Low aspect ratio tires
Your Aud i is factory-equipped with low aspect ra ­
tio tires . These ti res have been tho roughly tested
252
and been sele cted specifica lly for your mode l for
their superb performance, road fee l and hand ling
u nder a var iety of dr iv ing cond it ions. Ask your au ­
thori zed Audi dea ler fo r more details.
The low aspect rat io o f these tires is indica ted by
a n umera l of
55 or less in the tire's size designa­
t ion . The n umera l represents the ratio of the
tire's sidewall height in relation to its tread width
expressed in percentage. Convent iona l tires have
a height/width ratio of 60 or more .
The performance of low-aspect-ratio tires is par­
t ic ularly sensitive to improper inflation pres ­
sure.
It is the refore important that low aspect
ratio tire s are inflated to the specified pressure
and that the inflation pressur e is regularly
checked and maintained . T ir e pressures should
b e c hec ked at l east on ce a month and alway s
befor e a long trip
¢ page 246.
What you can do to avoid tire and rim
damage
Low aspect ratio tires can be damaged more eas i­
l y by impact with potholes, curbs, gullies or
ridges on the road, particularly if the tire is un­
derinflated.
In orde r to mi nimi ze the occur rence of impact
dam age to the tires of yo ur vehicle, we recom ­
mend tha t you observe the following preca u­
tions:
- Always ma intain recommended i nflation pres­
sures. Check yo ur tir e pressure eve ry 2,0 00
m iles (3,000 km) and add air if necessary .
- Dr ive ca refully on roads w ith potholes, deep
gullies o r ridges. The impac t from dr iv ing
through or over such obstacles can damage
your tires. Impact with a curb may a lso ca use
damage to your ti res.
-After any impact, immediate ly inspect you r
tires or have them inspected by the nearest au­
thorized A udi dealer. Replace a damaged tire as
soon as possible.
- Inspect your tires every 2,000 mi les (3,000 km)
for damage and wear. Damage is not always
easy to see . Damage can lead to loss of air and
underinflation, wh ich could eventually cause
tire fa ilure . If you be lieve that a tire may have .,.

Emergency assistance
Emergency assistance
Trunk escape handle
In case of an emergency, the rear lid can be
opened from the inside using the trunk escape
handle.
Fig. 210 T runk escape handle: View from inside the closed
tru nk
To open rear lid
.. Pull the handle down towards the bumper
¢ fig. 210.
The trunk escape handle inside the rear lid is
made of fluor escent material to glow in the dark.
A WARNING
The trunk escape handle is to be used only in
an emergency.
@ Tips
The emergency release lever should never be
used as a handle for closing the rear lid.
Equipment
Warning triangle
Applies to: vehicles with warn ing triangle
r ---->
Fig . 211 Luggage compartment lid : warning triangle
256
The warning triangle placed in the vehicle at the
factory is located in the luggage compartment.
.. To remove the warn ing triangle, press the fas-
tener in the direction of the arrow and fold the
holder down.
The luggage compartment lid is only designed to
hold the warning triangle offered by the original
accessories program.
Vehicle tool kit
Applies to: vehicles with vehicle tool kit/tire mobility kit
Fig. 212 Luggage compartment: cargo floor cover folded
upward
Fig. 213 L uggage compartment: examp le of vehicle tool
ki t and vehicle jack
The vehicle tool kit and vehicle jack* are stored in
the luggage compartment under the cargo floor cover .
.. Lift the cargo floor by the plastic handle .
.. Hook the handle in the luggage compartment
weather strip
¢ fig. 212 .
.. Tu rn the large screw counter -clockw ise .
.. Remove the spare tire * to access the vehicle
tool kit¢
fig. 212.

Depending on the equipment, the vehicle tool kit
may be located under the spare tire under an ad­
d itional cover or in the too l box. The position of
the vehicle jack* may vary.
A WARNING
Improper use of the vehicle jack can cause se­
r ious personal injuries.
- Never use the screw driver hex head to
t ighten wheel bolts, since the bolts cannot
attain the necessary tighten ing torque if you
use the hex head, potentia lly causing an ac­
c ident.
- The factory-supplied jack is intended on ly
for your vehicle model. Under no circum­
stances should it be used to lift heavy
vehicles or other loads; yo u risk injuring
yo urself.
- Never start the engine whe n the vehicle is
raise d, which could ca use a n accident.
- Support the veh icle secure ly with appropr i­
a te stands if wor k is to be perfo rmed u nder ­
neath the veh icle; otherwise, the re is a po­
tential risk for in jury.
- Never use the jack s upplied with your Audi
on another vehicle, particularly o n a heav ier
one. The jack is only suitab le for use on the
vehicle it came wit h.
@ Tips
The vehicle j ack* in your vehicle is mainte ­
nance -free.
Em ergen cy a ssis tanc e
Space-saving spare tire (compact spare
tire)
Applies to: vehicles with space-saving spare tire
The spare tire/wheel is located in the luggage
compartment under the cargo floor cover . It is
intended for short-term use only.
Fig . 21 4 Spare tire
Ta king out the spare tir e
... Lift the cargo floor by the p lastic handle
q fig. 214.
.,. Hook the handle into the luggage compartment
weather strip.
.,. Turn the large screw
r:=;, fig . 214 cou nter-clock­
w ise.
.,. Take ou t the spare tire.
.,. Always s to re the vehicle too l kit, the jac k* and
the rep laced tire i n the luggage compartment
r:::;, page 135.
.,. Unhook the cargo floor before closing the rear
lid.
Using the spare tire (compact spare tire )
The compact spare tire is on ly intended for emer­
gencies until you can reach a repair shop . Rep lace
it as quick ly as poss ible with a standard wheel
and tire.
T here are some restr ictions on the use of the
compact spare tire. The compact spa re tire has
been designed specifically for your type of vehi­
cle . It must not be swapped with a compact
spare tire from another type of vehicle.
Snow chains
For technical reasons, the use of snow chains on
the compact spare tire is
not permitted. .,..
257