2017 AUDI S4 service

Checking and Filling
authorized Audi dealer or authorized Audi
Service Facility for assistance.
Fuel filler door emergency release
If the central locking system is faulty, the fuel
filler door can be unlocked manually.
Fig. 241 L uggage compartment: opening the side t rim
panel
F ig. 242 luggage compartment: fue l fi ller doo r emergency
r elease
The emergency opening mechanism is located
behind the right side trim panel in the luggage
compartment.
• Open the cover in the side panel
¢fig. 241.
• Loosen the loop c> fig. 242 from the retainer
and then pull on the loop carefully
c>0 . The
fuel filler door releases.
• Press on the left side of the fuel filler door to
open it
¢page 298, fig. 239 .
(D Note
Only pull on the loop until you feel resistance .
You will not hear it release. Otherwise you
could damage the emergency re lease mecha­
nism .
300
Selective catalytic
reduction (AdBlue)
General information
Applies to: vehicles with selective catalytic reduct ion
In vehicles with selective catalytic reduction, a
urea solution (AdBlue) is injected into the ex­
haust system before a nitrogen oxide cata lytic
converter to reduce nitrogen emissions.
The Ad Blue is carried in a separate tank in the ve­ hicle. The Ad B lue usage accounts for approxi­
mately 1.0% to 2.5% of the diesel fuel that is
used.
When a message about refi lling the AdBlue ap­
pears in the instrument cluster display, you must
ref ill the Ad B lue yourself or have it refilled by an
authorized Audi dealer or authori zed Audi Service
Facility
c> page 301.
(l} Tips
- The d isp lay indicates the distance rema ining
that can be driven¢
page 300. If the Ad Bl­
ue tank is completely empty, the engine will
not start again after the ignition is switched
off .
- Ad Blue is required by law to operate th is ve­
hicle.
Messages in the instrument cluster display
App lies to: vehicles with selective cata lytic reduction
The display indicates if the Ad Blue level is low or
if there is a system malfunction .
Ad Blue level low
You will be informed in the instrument cluster
display if the Ad Blue in the tank drops below a
certain level. Add at a minimum the amount of
Ad Blue shown in the message:
• Refill with at least x qt (l) Ad Blue . Range
x mi (km)
This message appears when there is only enough
AdBlue left to drive the distance indicated in the
instrument cluster. Fill the AdBlue.
• Refill with at least x qt (I) AdBlue . No en­
gine start in x mi (km ). See owner's manual

This message appears when there is only enough
Ad Blue left to drive the distance indicated in the i nstr ument cluster . Fill the Ad Blue. Otherwise
the eng ine will not start aga in if you stop it once
the distance indicated has been dr iven .
• Refill with at least x qt (l) AdBlue. Engine
start not po ssible . S ee owner 's m anual
This message appears when the AdBlue ta nk is
empty. Fill the AdB lue . Otherwise you will not be
ab le to start the engine agai n once yo u stop it.
The AdBl ue m ust be refilled when the amoun t in
the tank has reached the minimum level
c::> page 301, Preparation .
Incorrect filling/system malfunction
A message appears if the Ad Blue tank was filled
with a f luid other than Ad Bl ue and the system
h as detec ted that the t ank was fi lled incor rect ly,
or if there is a system malfunc tion .
II Ad Blue: malfunct ion! No engine start in
x mi (km ). See owner's manual
This message appears when it is only poss ible to
drive the d istance indicated in the instrumen t
cluster . Drive to the nearest authorized A udi
deale r or autho riz ed Aud i Serv ice Facility to have
the m alfunction co rrected. Otherwise the engine
w ill no t start aga in if you stop it once the d is­
tance indicated has been driven .
• Ad Blue : malfun ction! No engin e start poss i­
ble. See owner' s manual
This message appea rs if the system has detected
that the tank was filled inco rrectly or that there
is a malfunction . D rive immediately to the near­
est a utho riz ed Aud i dea ler o r authorized Audi
Service Fa cili ty to have the malfunction correct­
ed . Otherwise you will not be able to start the en­
gine again once you stop it.
Checking and Filling
Preparation
Applies to: vehicles with selective cata lytic reduction
Fig. 243 Right rear s ide o f th e ve hicle: removing t he Ad Bl­
u e cap
The Ad Blue tank ope ning is located near the d ie­
se l tank opening. Add at least 1.5 gallons (5. 7
L)
of Ad Blue. This is the minim um amount required
to ensure the system detects the refilling and to
start the engine. You can add a maximum of 6.3 gallons (24 L).
Requireme nt: the request to add Ad Blue must
appea r in the instrument cluster disp lay.
.,. Switch the ignit ion off.
.,. Open the tank filler doo r
c::> page 298.
.,. Tu rn the tank filler neck cap to the left to re­
move
c::>fig. 243.
.,. Refill Ad Blue using a bottle c::> page 302, a can­
ister
c::> page 302 or a pump nozzle
c::> page 303 .
A WARNING , ~ -Ad B lue can irritate the sk in, eyes and respira­
tory sys tem.
If th ere is contact with the flu id,
flus h immed iate ly w ith plenty of wa ter. Con­
su lt a phys ician if necessary.
(D Note
- Only use Ad Blue that conforms to the
standard ISO 22241-1. Do not m ix any addi­
tives with the Ad Blue and do not dilu te it
w ith wate r.
- Do not add AdBl ue to the diesel tank or add
diese l fuel to t he A d Bl ue tank. Do not s tart
t he engine un de r any c ircumst ances if th e
wrong fuel is filled in the tan k. There is a
r is k of damaging the fue l tank system and
301

Checking and Filling
the engine. See an authorized Audi dealer or
authorized Audi Service Facility for assis­
tance.
- Ad Blue attacks surfaces such as painted ve­
hicle components, plastic and carpet. Re­
move the fluid as quickly as possible with a
damp cloth and plenty of cold water. If the
Ad Blue has already crystallized, use warm
water and a sponge . Ad Blue residue that is
not removed will crystallize and can damage
the affected surface.
- Do not store refill bottles or canisters per­
manently in the vehicle. If the container
leaks, the escaping AdBlue could damage
the vehicle interior.
- Do not allow Ad Blue to come into contact
with clothing.
If there is contact with the
fluid , flush immediately with plenty of wa­
ter.
(D Tips
Follow the Ad Blue manufacturer 's instruc­
tions for use and storage.
Refilling AdBlue using the bottle
Applies to: veh icles with selective catalyt ic reduction
.. Remove the cap from the refill bottle¢ A in
Preparation on page 301,
~ CD in Preparation
on page 301.
.. Position the bottle on the filler tube and turn
the bottle clockwise until it stops turning.
.. Press lightly against the bottom of the bottle
to empty it. Continue pressing the bottom of
the bottle until it is empty or until fluid stops
flowing into the tank.
.,. Remove the bottle and seal the filler neck
¢ page 303, Completing AdBlue refill.
(D Note
Only use refill bottles that are approved for
your vehicle. Using other systems can cause
Ad Blue to leak.
(j) Tips
- You can obtain refill bottles from an author­
ized Audi dealer or authorized Audi Service
Facility.
302
- A permitted refill bottle contains approxi­
mately 0.5 gallon (1.9 liters) of AdBlue.
Refilling AdBlue using a canister
Applies to: vehicles with selective catalyt ic reduct ion
@
+®
Fig. 244 Canis te r w ith attachable hose
.,. Remove the cover from the refill canister ¢ A
in Preparation on page 301, ¢(Din Prepara­
tion on page 301 .
.. Secure the end of the hose (Don the opening in
the canister @by turning the hose to the right .
.. Remove the cap @from the other end of the
hose @ .
.. Position the end of the hose@on the filler
neck in the vehicle and turn the hose to the
right 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 tube
¢ page 303, Completing AdBlue refill .
([) Note
Only use refill canisters that are approved for
your vehicle. Using other systems can cause
AdBlue to leak.
(D 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 Blue.

reproductive harm. In addition, certain flu­
ids contained in vehicles and certain prod­
ucts of component wear contain or emit
chemicals known to the State of California
to cause cancer and birth defects or other
reproduct ive harm.
- Battery posts, terminals and related acces­
sories contain lead and lead compounds,
chem icals known to the State of California
to cause cance r and rep roductive harms.
Wash hands after handling.
(D Note
When filling flu ids, be sure not to mix the flu­
ids up . Otherwise severe ma lfunctions and en­
gine damage w ill occur.
@ For the sake of the environment
You should regularly check the grou nd under
your veh icle in order to detect Leaks qu ickly . If
there are v isible spots from oil or other fluids,
bring your vehicle to an authorized Aud i dea l­
er or authorized Audi Service Facility to be
checked.
Opening the hood
The hood is released from the interior.
F ig. 2 45 Dri ver fo otw ell : rele ase leve r
Checki ng an d Fill in g
Fig. 246 Unlocke d hood: lever
Make sure the wiper arms are not raised up from
the windshield. Otherwise the paint could be
damaged .
.,. With the driver's door open, pull the lever be­
low the instrument pane l in the direction of the
arrow
c;> fig. 245 .
.,. Raise the hood slightly c;> ,&. .
.,. Press the lever c;> fig. 246 in the direct ion of the
arrow. This releases the hooks .
.. Open the hood .
A WARNING
-
Never open the hood if you can see steam or
coolant escaping from the engine compart­ ment, because this increases the risk of
burns. Wait until no steam or coolant is es­
cap ing .
Closing the hood
.,. Push the hood down until you override the
force of the str uts .
.,. Let the hood fall lightly into the latch .
Do not
press it in.
c;> &_ .
A WARNING
-===
If the hood is not latched complete ly, it could
fly up wh ile you are driving and obstruct your
vis ion.
- For safety reasons, the hood must always be
closed securely while driv ing. Because of
this, always check the hood after closing it
to make sure it is latched correctly . The
hood is latched if the front corners cannot
be lifted.
~
305

<( a, .... N ,....
N .... 0 0
3 a,
Audi oil quality standard
Gas oline
VW 502 00 or
engi ne vw 504 00
Diesel vw 507 00
eng ine
A udi recomm ends
~ Castrot /jglQ,Y j;-11Jt ?rtwF«J.o,.11-J.
Audi recomm ends Longlife high perf orma nce
engine oil from Aud i Genuine Parts
Using the proper engine oil is important for the
functionality and service life of the eng ine. Your
engine was factory-filled with a high-quality oil
which can usually be used throughout the entire
year.
(D Note
Your Limited New Vehicle Warranty does not
cover damage or malfunctions due to failure
to follow recommended maintenance and use
requirements as set forth in the Aud i Owner's
Manual and Warranty
& Maintenance booklet .
- Use only a high quality eng ine oil that ex-
pressly complies with the Aud i oil quality
standard specified for your vehicle's engine .
U si ng a ny other oil can cause serious engine
damage.
- Do not mix any lubr icants or othe r additives
i nto the engine oil. Doing so can cause en­
gine damage.
If you need to add oil and there is none availa­
ble that meets the Audi o il quality standard
your eng ine requ ires, you may add a tota l of
no more than 0 .5 qua rt/liter of a h igh-quality
"synthetic"oil that meets the following speci­
fications.
- Vehicles with gasoline engine: AC EA A3 or
API SM with a viscosity grade of SAE OW-30,
SAE SW-30 or SAE 5W-40.
- Vehicles with diesel engine: ACEA C3 or API CF with a viscosity grade of SAE OW-30
or SAE 5W-30.
- For more information about engine oil that
has been approved for your vehicle, please
contact either your authorized Audi dea ler
Ch eck ing and Filling
or Audi Customer Relations at
1 (800) 822-2834 or visit our web site at
www.aud iusa .com or www .a udicanada .ca.
Engine oil consumption
The engine in your vehicle depends on on ade­
quate amount of oil to lubricate and cool all of
its moving ports.
In order to provide effective lubrication and cool ­
ing of internal engine components, all internal
combust ion eng ines consume a certa in amount
of oil. Oil consumption varies from eng ine to en­
gine and may change s ignificantly over the life of
the engine. Typ ically, engines w ith a specified
break-in period (see
c::> page 73) consume more
o il during the break-in per iod than they consume
after oil consumpt ion has stabil ized.
Under normal cond itions, the rate of oil con­
sumption depends on the quality and viscos ity of
the oil, the RPM (revolutions per minute) at
which the engine is operated, the amb ient tem­
peratu re and road co ndit ions. Furt her fac to rs a re
the amo unt of oil di lution from wate r condensa­
tion or fuel residue and the oxidation level of the oi l. As any engine is subject to wear as mileage
builds up, the oil consumption may increase over
time unt il replacement of worn components may
become necessary.
With a ll these variab les coming into play, no
standard rate of oil consumption can be estab­
lished or spec ified . There is no alternative to reg­
ular and frequent checking of the oi l level, see
Not e.
If the yellow engine oil level warning symbo l El
in the instrument cluster lights up, you should
check the oil level as soon as possible
c::> page 308 . Top off the o il at your earliest con­
venience
c::> page 308 .
A WARNING
Before you check anyt hing in the engine com­
partment, always read and heed all WARN­
IN GS
c::> .&. in Working in the engine compart-
ment on page 304. ..,_
307

<( a, .... N ,....
N .... 0 0
3 a,
CD Note
-Check the oil level in the Infotainment sys­
tem. If the message
II Please reduce oil
level
appears, contact an authorized Audi
dealer or authorized Audi Service Fac ility to
have excess oil extracted if necessary.
- Do not mix any additional lubricants into
the engine o il. Damage caused by such addi­
tives is not covered by the warranty .
@ For the sake of the environment
-Oil should never enter the sewer system or
come into contact with the ground.
- Pay attention to legal requirements when
dispos ing of empty oil containers.
Changing the engine oil
We recommend that have your oil changed by an
authorized Audi dealer or a qualified service sta­
tion.
Before you check anything in the engine compart­
ment,
always read and heed all WARNINGS c> A
in Working in the engine compartment on
page 304 .
The engine oil must be changed according to the
intervals specified in your Warranty
& Mainte­
nance booklet. This is very important because the
lubricating properties of oil diminish gradually
during normal vehicle use.
Under some circumstances the engine oil should
be changed more frequently . Change oil more of­
ten if you drive mostly short distances, operate
the vehicle in dusty areas or under predominantly
stop-and-go traffic cond it ions, or have your vehi­
cle whe re temperatures remain below freezing
for extended pe riods.
Detergent additives in the oil will make fresh oil
look dark after the engine has been running for a
short time. This is no rmal and is not a reason to
change the oil more often than recommended.
Because of the problem of proper disposal, along
with the special tools and necessary expertise re­
qu ired, we strong ly recommend that you have
Checking and Filling
your oi l changed by an authorized Audi dealer or
a qualified service station .
If you choose to change your oil yourself, please
note the following important info rmation:
A WARNING ~
To reduce the risk of persona l injury if you
must change the engine oil in your vehicle
yourself:
- Wear eye protection.
-
-To reduce the risk of burns from hot engine
oil, let the engine cool down to the touch.
- When remov ing the oil drain plug with your
fingers, stay as far away as possible. Always
keep your forearm parallel to the ground to
help prevent hot oil from running down your
arm.
- Drain the oil into a container designed for
this purpose, one large enough to hold at
least the tota l amount of oil in your engine.
- Engine oil is poisonous. Keep it well out of
the reach of children.
- Continuous contact with used engine oil is
harmful to your skin. Always protect your
skin by washing oil off thoroughly with soap
and water.
CD Note
Never mix oil additives with your engine oil.
These additives can damage your engine and
adverse ly affect your Audi Limited New Vehi­
cle Warranty.
@ For the sake of the environment
-Before changing your oi l, first make sure
you know where you can properly dispose of
the used oil.
- Always dispose of used engine o il properly.
Do not dump it on garden soil, wooded
areas, into open streams or down sewage
drains.
- Recycle used engine o il by tak ing it to a used
eng ine oil collection fac ility in your area, or
contact a service station .
309

Checking and Filling
Cooling system
Coolant
The engine coo ling system is filled with a mixture
of pur ified water and coolan t addit ive at the fa c­
tory. This coo lant must not be not changed.
The coolant leve l is monito red throug h the . in­
dicator light~
page 31. Howeve r, we do recom­
mend occasionally check ing the coo lan t level
manually.
I f you must add coolant, use a m ixture of water
and coolant additive. M ixing the coolant additive
with d istilled wate r is recommended.
Coolant additive
The coolant additive is made of anti-freezing a nd
corros ion protection agents. Only use the fo llow­
ing coo lant add it ives. These additives may be
m ixed w ith each other.
Coolant additive Specification
G13
TL 774)
G12++ TL 774 G
The amount of coo lant add itive that needs to be
mixed w it h water depends on the climate where
the vehicle will be operated. If the coolant addi­
tive percentage is too low, the coolant can freeze
and damage the engine.
Coolant Freeze protec-
additive tion
Warm min. 40% m in. -13 °F
reg ions max. 45% (-25 °C)
Cold min. 50% max. -40 °F
reg ions max. 55% (-40 °C)
(D Note
- Befo re the start of winter, have your author­
i zed Audi dealer or authorized A udi Service
Fac ility check if the coolant additive in yo ur
vehicle matc hes the percentage approp riate
fo r the climate. Th is is especially important
when driving in co lde r climates.
- If the appropriate coolant additive is not
available in an emergency, do not add any
other additive. You cou ld damage the en-
310
gine . If this happens, only use water and re ­
store the correct m ixt ure ratio with the
specified coo lant add itive as soon as poss i­
ble.
- On ly ref ill with new coolant .
- Rad iator sealant mus t not be mixed wi th
the coolant.
Adding coolant
Fig. 24 9 Eng ine co mpart m ent: re lease button on coolant
expansio n tank
Check ing the engine coolant level
.,. Park your veh icle on a level surface.
.,. Switch the ignit ion off.
.,. Read the coolant level on the coolant expansion
tank
c:> fig . 249 .
.,. The coolant leve l mus t be between the MIN and
MAX mar kings when the engine in co ld. Whe n
t he engi ne is warm i t ca n be sligh tly above the
MAX mar kin g.
Adding coolant
.,. Let the engi ne cool down.
.,. Place a cloth over the coo lant expansion tank
cap.
.,. Push the rele ase button¢
fig. 249 and carefu l­
ly unsc rew the cap to the left un til you feel re­
sis tance ¢,&. .
.,. Push the release button again and remove the
cap completely.
.,. Make sure that the fluid level remains stab le.
Add more coolant if necessary .
.,. Turn the cap to the right to secure it until you
feel res istance a second time.
Coolant loss usually ind icates there is a leak. Im­
med iate ly dr ive your vehicle to an author ized
Audi dealer or authorized A udi Service Fac ility ..,.

and have the cooling system inspected. If the
cooling system is not leaking, a loss can come
from the coolant boiling through overheating and being pushed out of the cooling system.
A 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 switch
on even if the ignition is switched off, which
increases the risk of injury.
(D Note
Do not add coolant if the expansion tank is
empty. There may be a ir in the cooling sys­
tem, which increases the risk of engine dam­
age . If this is the case, do not continue driv­
ing . See an authorized Audi dealer or author­
ized Audi Service Facility for assistance.
Brake fluid
Checking brake fluid level
The brake fluid level can be checked with a quick
glance .
Fig. 250 Engine compa rtment: Cover o n the brake fluid
rese rvoir
Before you check anything in the eng ine compart ­
ment,
always read and heed all WARNINGS
Checking and Filling
c::> .&. in Working in the engine compartment on
page 304.
" Read the brake fluid level from the brake fluid
reservoir
c::> fig. 250, c::> page 306, fig. 247. The
brake fluid level must be between the "MIN"
and "MAX" markings.
The brake flu id reservoir is located at the rear
partition of the engine compartment on the left
side
~ page 306 .
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/indicato r
light (USA models:
11111 , Canada models : II>
will come on c::> page 29. Do not continue to oper­
ate the vehicle. The complete brake system
should be thoroughly checked by an authorized
Audi dealer or qualified workshop and the cause
corrected . If the brake fluid level is too low, the
brake warning/indicator light will illuminate .
Contact an authorized Audi dealer
immediately .
@ Tips
The brake fluid reservoir is located under­
neath the cover.
Changing brake fluid
Hove the broke fluid changed by on 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 point of the brake fluid
will also decrease considerably and decrease braking performance .
Therefore, the brake fluid must be changed
every
two years .
Always use new brake fluid which con­
forms to Federal Motor Vehicle Standard "FMVSS
116 DOT 4" .
The brake fluid reservoir can be difficult to reach,
therefore, we recommend that you have the brake fluid changed by your authorized
Audi
dealer.
Your dealer has the correct tools, the
311