2015 AUDI A8 ignition

Refuelling
Fig. 190 Right rear vehicle sid e: Opening t he fuel filler
flap
Fig. 191 Fu el filler flap with attached fuel cap
When activating the central locking, the fuel
filler flap is automatically unlocked or locked.
Refuel the vehicle with the ignition switched
off.
Taking the fuel cap off
• Press the left side of the fuel filler flap to
open it¢
fig. 190 -arrow- .
• Unscrew fuel filler cap counter-clockwise
and hang it on the fuel filler flap
r;, fig. 191.
• Check the label on the inside of the fuel fill­
er flap to determine if the vehicle must be
fueled with gasoline or diesel fuel.
Refuelling procedure
• Insert the fuel nozzle from the gasoline
pump into the fuel filler neck as far as it will
go.
• Select a medium refuelling rate so that the
nozzle switches off automatically when the
tank is full.
Putting the fuel cap back on
• After filling your tank, twist the fuel filler
cap clockwise as far as it will go.
• Close the fuel filler flap.
Fuel supply and filling your fuel tank 223
To avoid fuel spilling or evaporating from the
fuel tank always close fuel filler cap properly
and completely. An improperly closed fuel fill­
er cap may also cause the MIL lamp¢
page 29
to come on (only vehicles with gasoline en­
gine).
A WARNING
-
Improper refueling or handling of fuel can
cause fire, explosion and severe burns.
- Fuel is highly flammable and can cause
severe burns and other injuries.
- Failure to shut the engine off while refu­
eling and/or to insert the pump nozzle
fully into the fuel filler neck could cause
fuel to spray out of filler neck or to over­
flow. Fuel spray and overflowing fuel can
cause a fire.
- Never use a cellular telephone while re­
fueling. The electromagnetic radiation
can cause sparks that can ignite fuel va­
pors and cause a fire.
- Never get back into your vehicle while re­
fueling. If in exceptional circumstances
you must get back in your vehicle while
refueling, make certain that you close
the door and touch metal to discharge
static electricity before touching the fill­
er nozzle again. Static electricity can
cause sparks that can ignite fuel vapors
released during refueling .
- Never smoke or have an open flame any­
where in or near your vehicle when refu­
eling or filling a portable fuel container.
- For your safety, we strongly recommend
that you do not travel with a portable
fuel container in your vehicle. The con­
tainer, full or empty may leak and could
cause a fire, especially in a crash.
- If, under exceptional circumstances, you
must transport a portable fuel container,
please observe the following:
- Never fill a portable fuel container
while it is anywhere in or on the vehicle
(for example, in the luggage compart­
ment, or on the trunk). Static electrici­
ty can build up while filling and can ig-
nite fuel vapors causing a fire. .,.
'------------=---------

.. Loosen the loop C? fig. 193 from the retaine r
and then pull on t he loop carefully
~CD-
.. Press on the left s ide of the fuel filler door
to open C?page 223, fig. 190.
(D Note
Only pull on the loop until you feel resist­
ance. You will not hear it release . Other­
w ise you could damage the emergency re­
lease mechanism .
Selective catalytic
reduction
General information
Applies to vehicles: with d iesel e ng in e
On vehicles w ith select ive catalytic reduction,
an urea solut ion (Ad Blue) is injected into the
exhaust system befo re a nitrogen oxide cata ­
lytic converter to reduce nitrogen emiss ions .
The AdBlue is stored in a separate tank in the
ve hicle. The Ad Blue usage accounts for ap­
prox imately 0 .5% to 1.2% of the diesel fuel
that is used .
You must refill the Ad Blue or have it refilled by your authorized Audi dealer or qualified
workshop as soon as the Ad Blue refill mes ­
sage appears in the instrument cluster
C? poge 226.
,& WARNING
Failure to hee d Ad Blue refi ll information in
t he ins trument cl uste r can preven t the ve­
hicle from being s tarted and d rive n. If the
vehicle cannot be driven and an eme rgency
ar ises, persona l injury can occur.
- Always have the Ad Blue tank refilled well
before the tank runs dry .
@ Tips
-The ins trument clus ter display indi cates
the distance remaining that ca n be driv­
en
C? page 225 . If the Ad Blue tank is
complete ly empty, the engi ne will not
start again after the ignition is switched
off.
Fu el suppl y and filli ng your fuel t ank 225
- Ad Blue is req uired by law to ope rate this
vehicle .
Indicator in the instrument cluster
display
Applies to vehicles: wit h diese l engine
The display indicates if the Ad Blue level is low
or if it was filled incorrectly.
Fi g. 194 In strume nt cl uste r: indicator in the d isp lay
AdBlue level low
You w ill be informed if t he Ad B lue in the tank
drops below a certa in level.
Please refill Ad Blue. Range 1500 miles
( 2400 km )
This indicator appears when there is on ly
enough AdBl ue left to drive the distance indi­
cated in the driver information system. Please
add AdBlue.
AdBlue /; Refill AdBlue! Cannot start en­
gine in 600 miles (1000 km) ! See owner 's
manu al
This indicator appears when there is only
enough Ad Bl ue left to d rive the distance indi­
cated in the driver information system. Please
add AdBl ue. Otherwise the engine will not
start again if you stop it once the distance in­
dicated has been driven.
Refill AdBlue! No rest art! See
owner's m anual
T his message appears w hen the Ad Blue tank
is empty. P lease ad d Ad Blue. Otherwise you
will not be able to start the eng ine again once
you stop it. ..,.

226 Fuel supply and filling your fuel tank
When the minimum AdBlue leve l has been
reached, you must add Ad Blue ¢
page 226.
¢-fi Filling incorrectly
If the Ad Blue tank was filled with a different
fluid than Ad Blue and the system detects that
it is incorrect, a message w ill appear.
Ad Blue../ AdBlue: Sy stem fault No restart
in 600 miles (1000 km)! See owner's man­
ual
This message appears when it is only poss ible
to drive the distance indicated in the dr iver in­
formation system. Drive to the nearest quali­
fied workshop to have the malfunction re­
pa ired. Otherwise the engine will not start
again if you stop it once the distance ind icated
has been driven.
Ad Blue: System fault No restart!
See owner's manual
This message appears if the system detects it
was filled incorrect ly. Drive immed iately to
the nearest qualified workshop to have the
malfunction repaired. Otherwise you will not
be ab le to start the engine again once you
stop it.
Filling AdBlue
Applies to vehicles: with diesel engine
A special refill bottle must be used to fill the
AdBlue .
Fig. 195 Rig ht rear vehicle s ide: removing the Ad B lue
filler cap
Fig. 196 AdBl ue fille r tube: inse rti ng the refill bottle
The Ad Blue filler tube is located near the d ie ­
sel fi ller tube . Always add 1 ga llon (3.8 liters)
of Ad Blue (two bott les) . Th is is the minimum
amount required to ensure the system detects
the refill ing and to start the engine . You can
add a maximum of approxima tely 4 gallons
(16 liters).
Opening the filler tube and adding
AdBlue
Requirement: The request to add Ad Blue must
appear in the instrument cluster display.
" Switch the ignition off.
"O pen the tank cover
r::!> page 223.
"Tur n the Ad B lue filler cap counterclockwise
to remove it
r::!> fig. 195.
"Remove the cap from the refill bottle .
.. Position the refill bottle on the filler tube
and turn the bottle clockwise until it stops
turning (Dr:!>fig .196 .
" Press lightly against the bottom of the bot­
tle @to empty it. Continue pressing the
bottom of the bottle until it is empty or un­
til flu id stops flowing into the tank.
" Turn the bottle to the left w ithout pressing
on the bottom.
Closing the filler tube
" Turn the AdB lue fi ller cap clockw ise on the
fi ller tube until you hear it engage.
" Close the tank cover.
After filling
The vehicle must be driven. The system may
take up to two minutes to detect that the
AdBlue has been f illed. .,.

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~ If there was no Ad Blue left in the tank and a
range of
O mi (0 km ) was displayed in the
instrument cluster, switch the ignition on
for about 15 seconds before starting the en­
gine.
_& WARNING
Ad Blue can irr itate the skin, eyes and res­
piratory system . If there is contact with
the fluid, flus h immed iately with plenty of
wate r. Consult a physician if necessary.
(D Not e
-Only use Ad Blue that conforms to the
standard ISO 22241-1. Do not mix any
additives with the Ad Blue and do not di­ l ute it with water .
- Do not add Ad B lue to the diesel tank or
add diesel fuel to the Ad Blue tank. M ix­
i ng can lead to damage to the engine
and the Ad Blue tank system . The Limited
New Vehicle Warranty does not cover
such damage.
- Ad Blue attacks surfaces such as painted
vehicle components, plastic and carpet.
Remove the fluid as quick ly as possib le
with a damp cloth and plenty of cold wa­
ter. If the Ad Blue has already crystal­
lized, use warm water and a sponge.
AdBlue residue that is not removed w ill
crystall ize and can damage the affected
surface.
- Do not store the refill bottle in the vehi­ cle. If it leaks, the escap ing Ad B lue could
damage the vehicle inter ior.
- Do not allow Ad Blue to come into con­
tact with clothing. If there is contact
with the flu id, flush immediately with
plenty of water.
(D Tips
- You can obtain refill bott les from any au­
thorized Audi dealer or other qua lified
workshop.
- Follow the AdBl ue manufacturer's in­
str uctions for usage and sto rage.
Fu el su ppl y and fi lling yo ur fu el t an k 22 7
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228 Checking and filling
Checking and filling Engine hood
Releasing the engine hood
The engine hood is released from inside the
vehicle .
Fig. 197 Driver foo twell: release lever
Fig. 198 Rocker switch un der the hood
Make sure the wiper arms are not raised up
from the windshield. Otherwise the paint
could be damaged.
.,. Pull the lever under the instrument panel in
the direction of the arrow
¢ fig. 197.
.,. Raise the hood slightly¢,&. .
... Press the rocker switch under the hood up­
ward ~
fig. 198. This releases the catch.
• Open the hood.
&_ WARNING
Hot engine coolant can burn you.
- To reduce the risk of being burned, never
open the hood if you see or hear steam
or coolant escaping from the engine compartment . Wait until no steam or
coolant can be seen or heard before care­
fully opening the hood .
'Working in the engine compartment
Be especially careful whenever you work in
the engine compartment.
Whenever you must perform any work in the
engine compartment, for example checking
and filling different fluids, there is a risk of injury, burns and accidents. To prevent per­
sonal injury always observe the following
WARNINGS. The engine compartment of any
vehicle is a hazardous area
¢ ,&. .
A WARNING
To help avoid injury, before you check any­
thing under the hood:
- Turn off the engine.
- Switch off the ignition .
- Apply the parking brake.
- Move selector lever to "P" (Park) .
- Always let the engine cool down. Hot
components will burn skin on contact.
- To reduce the risk of being burned, never
open the hood if you see or hear steam
or coolant escaping from the engine
compartment. Wait until no steam or
coolant can be seen or heard before care­
fully opening the hood.
- Keep children away from the engine com­
partment.
- Never spill fluids on hot engine compo­
nents . They can cause a fire .
- Never touch the radiator fan. The auxili­
ary electric fan is temperature controlled
and can switch on suddenly .
- Never open the coolant reservoir cap
when the engine is still warm . The cool­
ant system is pressurized and hot cool­
ant could spray out.
- Protect your face, hands and arm from
steam or hot engine coolant by placing a
thick rag over the cap when you open the
coolant reservoir.
- Do not
remove the engine cover under
any circumstances. This increases the
risk of burns.
- If work on the fuel system or the electri­
cal system is necessary:

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-Always disconnect the battery.
- Never smoke or work near heaters or open flames. Fluids in the engine com­
partment could start a fire.
- Keep an approved fire extinguisher im­
mediately available.
- To avoid electrical shock and personal in­
jury while the engine 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 repair
with the engine running:
- First, fully apply the parking brake,
move selector lever to "P" (Park).
- Always use extreme caution to prevent
clothing, jewelry, or long hair from get­
ting caught in the radiator fan, V-belts
or other moving parts, or from contact­ ing hot parts. Tie back hair before
starting, and do not wear clothing that
will hang or droop into the engine.
- Minimize exposure to emission and
chemical ha zards c:::> & .
A WARNING
California Proposition 65 Warning:
- Engine exhaust, some of its constituents,
and certain vehicle components contain
or emit chemicals known to the State of
California to cause cancer and birth de­
fects and reproductive harm. In addition ,
certain fluids contained in vehicles and
certain products of component wear con­
tain or emit chemicals known to the
State of California to cause cancer and
birth defects or other reproductive harm .
Checking and filling 229
-Battery posts, terminals and related ac­
cessories contain lead and lead com­
pounds, chemicals known to the State of
California to cause cancer and reproduc­
tive harms. Wash hands after handling.
(D Note
When adding fluids, always make sure that
they are poured into the proper container
or filler opening, otherwise serious dam­
age to vehicle systems will occur.
(® For the sake of the environment
To detect leaks in time, inspect the vehicle
floor pan from underneath regularly . If
you see spots from oil or other vehicle flu­ ids, have your vehicle inspected by an au­
thorized Audi dealer.
Closing the engine hood
.,. Pull the hood down until the pressure from
the struts is reduced.
"'Let the hood
drop down and latch in place.
Do not try to push it shut; it may fail to en­
gage
c:::> ,A .
A WARNING
-
A hood that is not completely latched
could fly up and block your view while driv ­
ing .
- When you close the engine hood, check it
to make sure the safety catch has proper­ ly engaged. The hood should be flush
with the surrounding vehicle body parts.
- If you notice while driving that the hood
is not secured properly , stop at once and
close it. •
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Engine oil consumption
The e ngine in your vehicle dep ends on an ade ­
quate amount of oil to lubricate and cool all
of its m oving parts .
In order to provide effective l ubrication and
cooling of internal engine components, all in­
ternal combustion eng ines consume a certain
amo unt of o il. O il cons umption varies from
engine to eng ine and may c hange significant ly
over the li fe o f the eng ine . T yp ica lly, eng ines
with a specified break -in per io d (see
¢
page 205) cons ume more oi l during the
b reak-in period than they consume after oil
consumption has stabilized.
Unde r norma l conditions, the ra te of oil con ­
sumption depends on the quality and viscosity
of the oi l, the RPM (revo lutions per minute) at
which the eng ine is operated, the ambient
temperature and road condit ions. Further fac­
tors are t he amount of oil d ilution from wate r
condensation or fuel residue and the ox ida ­
t ion level of the o il. As any engine is subject to
wear as mileage bu ilds up, the o il consump­
tion may in crease over t ime un til re p la cement
of worn componen ts may become necessa ry.
W ith all these var iabl es com ing in to play, no
standa rd rate of o il cons umption can be es­
t a blishe d or specifie d. T he re is no a lterna tive
t o regular and freq uen t ch ecking of the oi l lev­
e l, see
Note .
If the ye llow eng ine o il level war ning symbol
in t he ins trumen t clus te r
II light s up, yo u
should che ck t he o il level as soon as possible
¢
page 233 or ¢ page 23 4. Top off t he oil at
your ea rliest convenience ¢
page 234.
A WARNING
Before yo u check anything in the engine
compartment, always read and heed all
WAR NINGS
¢ .&. in Working in the engine
compartment on page 228.
Dr iving with an insufficient oi l level is like­
ly to ca use seve re damage to the eng ine.
-
Checkin g and fillin g
(D Tips
- The oil pressure warning display. is
not an indicator of the oil level. Do not
rely on it. Instead, check the oil level in
your engine at regular intervals, pref­
erably each time you refuel, and always
before going on a long trip .
-If you have the impressi on yo ur engi ne
cons umes excess ive amounts of oil, we
recommend that you consult your Aud i
dea le r to have the cause of your concer n
properly diagno sed . K eep in mi nd th at
t he a ccu rate meas urement o f oil con ­
sumption requi res g reat care and may
take some t ime . Your Audi dea le r h as i n­
struct io ns about how to measure oil con­
sumption acc urate ly.
Checking the engine oil level
App lies to vehicles : wit h oil level indicator
Fig. 201 D isp lay: o il leve l indicator
.,. Par k yo ur vehicle o n a level su rface.
.,. Shu t the eng ine off when it is warm.
.,. Switch on ly the ignition back on.
.,. Wa it app roximately two minutes .
.,. Select:
!CAR ! functio n button > Car systems
cont ro l button > Servicing & checks > Oil
level.
.,. Check t he oil level i n the display ¢ fig. 201.
Add eng ine o il if the bar of the oil leve l ind i­
cato r is nea r "m in"¢
page 234 .
Depending o n the way the vehicle is dr iven
and the ope rat ing cond it ions, o il cons umption
can be up to 1/2 quart per 600 miles (0 .5 liter
per 1,000 km). Consumption may b e hig he r
within the first 3, 000 miles (5 ,0 00 km). ..,,.
233
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Checking the engine coolant level
The engine coolant level can be checked with
a quick glance .
Fig. 204 Eng ine compartme nt: cover o n the coolant
expansion tank
Before you check anything in the engine com­
partment,
a lway s read and he ed all WARN ­
INGS ¢ & in Working in the engine compart­
ment on page 228.
Park your vehicle on a level surface.
~ Switch off the ignition.
~ Read the engine coolant leve l from the cool­
ant expansion tank¢
fig. 204, ¢ page 230.
With a cold engine, the coolant level should
be between the "min" and "max" markings.
When the engine is warm, the level may be sl ightly above the ''max" marking.
The location of the coolant expansion tank
can be seen in the engine compartment illus­
tration ¢
page 230 .
To obtain an accurate reading, the engine
must be switched off.
The expansio n tank in your vehicle is equipped
with an electric coolant level sensor.
When t he coo lant level is too low, the warning
light in the Auto-Check System¢
page 15 will
illuminate unti l yo u add coolant and the level
has been restored to normal. Even thoug h
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 cool-
Checkin g and fillin g 237
ing system shou ld be inspected immediately
by your authorized Audi dealer . It is not
eno ugh merely to add coo lant .
In a
s ealed system, losses can occu r on ly if
the boiling point of the coo lant is exceeded as
a resu lt of overheating.
A WARNING
The cooling system is under pressure and
can get very hot. Red uce the risk of scald­
ing from hot coolant by follow ing these
steps.
- Turn off the engine and allow it to cool
down.
- Protect your face, hands and arms from
escaping flu id a nd steam by cover ing the
cap with a la rge, th ick rag.
- Turn the cap slowly and very carefully in
a counter-clockwise d irect ion while ap­
p lyi ng lig ht, dow nward pressure on the
top of the cap.
- To avo id being burned, do not sp ill anti­
freeze o r coolan t on the exhaust system
or ho t engine parts. Und er certa in cond i­
tions, the ethylene gly co l in engine coo l­
an t can catch fire.
(D Note
Do not add any type of radiator leak sea l­
ant to your veh icle's engine coo lant. Add­
i ng radia to r repa ir flui d may adverse ly af­
fe ct the fun ct io n and perfor man ce o f you r
coo ling system and could result in damage
not cove red by your New Vehicle Limi ted
War ranty.
Adding coolant
Be very careful when adding engine coolant .
Before you che ck a nyt hing in the eng ine com­
partmen t,
alway s re ad and he ed alt WARN­
INGS ¢ & in Working in the engine compart­
ment on page 228.
~ Requirement: There must be a residua l
a mo unt of coolan t in the expansion ta nk
¢(D.
~Tu rnoff the engine . •
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