2015 AUDI S3 SEDAN check engine

Checking and F ill in g
Checking and Filling
Gasoline
Fuel supply
App lies to veh icles: w ith gaso line engine
Using the right fuel helps keep the environment
clean and prevents engine damage.
Fuel re co mm en da tion
The fuel recommended for your vehicle is unl ead­
e d prem ium
grade gaso line. Audi recommends
using TOP TIER Detergent Gasoline with a mini­
mum octane rating of 91 AKI (95 RON). For more
information on TOP TIER Detergent Gasoline,
please go to the official website
(www.toptiergas .com).
The recommended gasoline octane rating for
your engine can also be found on a label located on the ins ide of the fuel filler flap . This rating
may be specified as AKI or RON .
Your vehicle may also be operated using unlead­
ed regular gasol ine with a minimum octane rat ­
ing of 87 AKl/91 RON. However, using 87 AKI/
91 RON octane fue l wi ll sli ght ly reduce engine
pe rformance.
U se un leade d ga solin e only . Unleaded gasoline
is available throughout the USA, Canada, and in
most European countries. We recommend that
you do not ta ke you r vehicle to areas or countr ies
where unleaded gasoline may no t be ava ilable.
For more informat ion on refueling your veh icle,
see
¢page 192.
Octan e rat ing
Octane rating indicates a gasoline's ability to re­
sist engine damaging "knock" caused by prema­
ture ignition and detonation . Therefore, buying
the correct grade of gasoline is very important to
he lp prevent possible eng ine damage and a loss
of eng ine performance.
Gasoline most commonly used in the Un ited
States and Canada has the following octane rat­
i n gs that ca n usually be found on the filler pump:
- Prem ium Grade : 91 - 96 AKI
190
- Regular Grade: 87 -90 AKI
Explanation of the abb reviations:
AKI = Anti Knock Index = (R +M)/2 = (RON+MON)/
2
RON= Research Octane Number
MON = Motor Octane Number.
{[) Note
-Do not use any fue l w ith o ctane rat ings low­
er than 87 AKI or 91 RON otherwise expen­
sive engine damage w ill occur .
- Do
not use leaded gasoline. The use of lead­
ed gasoline will severely damage your veh i­
cle's catalytic converter and its abi lity to
control exha ust em issions.
Blended gasoline
App lies to vehicles: wit h gaso line e ngi ne
U se of g aso lin e cont aining alcohol or MTBE
( meth yl tert iary butyl ethe r)
You may use unleaded gasoline blended with al­
cohol or MTB E (commonly referred to as oxygen­
ates) if the ble nded mixture meets the following
criteria:
Blend of gasoline methano l (wood alcohol or
m eth yl alcoho l)
-Anti -knock index must be 87 AKI or h igher.
- Blend must contain no more than 3% metha-
nol.
- Blend must contain more than 2% co-solvents.
Blend of ga solin e and ethan ol (grain alcoh ol or
ethyl alcohol )
- Anti-knock index must be 87 AKI or h igher.
- Blend must not conta in more than 15% etha-
nol.
Blend of ga soline a nd M TBE
- Anti-knock index must be 87 AK I or h igher.
- Blend must contain not more tha n 1S % MTB E.
S eas onall y adjust ed gasoline
Many gasoline grades are blended to perform es­
pecially well for winter or summer dr iv ing . Dur-
i ng seasonal change-over, we suggest tha t you .,..

fill up at busy gas stations where the seasonal
adjustment is more likely to be made in time.
(D Note
- Methanol f uels which do not meet these re­
quirements may cause corrosion and dam ­
age to plastic and rubber components in the
fuel system.
- Do not use fue ls that fail to meet the speci­
fied criteria in this chapter.
- If you are unable to determine whethe r o r
not a particular fue l blend meets the speci­
fications, ask your service station or its fuel
supplier.
- Do not use fuel for which the contents can­
not be identified.
- Fuel system damage and performance prob­
lems resulting from the use of fue ls differ­
ent from those specified are not the respon­
s ibility of Audi and are not covered under
the New Vehicle or the Emission Control
System Warranties.
- If you experience a loss of fuel economy or
driveability and performance problems due
to the use of one of these fuel b lends, we
recommend that you sw itch to unb lended
fuel.
Gasoline additives
A ma jor concern among many auto manufactur­
ers is carbon deposit build-up caused by the type
of gasoline you use.
Although gasol ine grades differ from one manu­
facture r to another, they have certa in things in
common . All gasoline grades contain substances
that can cause deposits to collect on vita l engine
parts, such as fue l injectors and intake valves. A l­
though most gasoline brands include additives to
keep engine and fuel systems clean, they are not
equally effective .
Audi recommends using TOP TIER Detergent Gas ­
oline. For more information on TOP TIER Deter-
"' gent Gasoline, please go to the off icial webs ite
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Checking and Fillin g
After an extended period o f using inadeq uate
fuels, carbon deposit build-ups can rob your en­ gine of peak performance .
(D Note
Damage or malf u nction due to poor fuel qual ­
ity is not cove red by the Audi New Vehicle
Limited Wa rranty.
Diesel fuel
Applies to vehicles: with diesel engine
Always use ULSD (Ultra Low Su lfur Diesel) No. 2 .
The ULSD No. 2 meets the ASTM 0975.
Diesel fuel w ith concen tra tions of biodiese l hig h­
er than 5
% such as Bl 1, B20 or 8100 are strictly
prohibited .
Se rv ice stat io n fue l pumps a re labe led with the
correct fue l information for easy recognit ion by
the user .
If the diese l fue l pump is not labe led
ask the station operator w hat fue l is being dis­
pensed before fi lling up your vehicle.
UL SD No. 2 may not be available outside the USA
and Canada . Be sure to check before traveling to
other countr ies .
UL SD No. 2 can become thicke r in very cold tem­
pera tures, and th is can impa ir t he engine's start­
ing and running. Depending on the season, gas
stations provide ULSD No . 2 that flows better in
cold temperatures so that you can continue oper­
at ing your vehicle as usual.
@ Note
- Yo ur vehicle's diesel engine was designed
soley for use with ULSD No. 2. Therefore,
never use gasoline, heating oil, other fuels
or flow improvers. These conta in substances
that will severe ly damage the fuel system
and the engine . Such damage will not be
covered by you r New Veh icle Limited War­
ranty.
- If you put any amount of incorrect fuel i n
the fuel tank, do not start the eng ine under
any circumstances. Immediate ly co ntact t he
nearest authori zed Aud i dealer or autho r­
ized Aud i Service Fac ility for assistance .
191

Checking and Fill in g
These fuels contain substances that can se ­
verely damage the fuel system and the en­
gine if the engine is started .
- If the diesel f uel quality is poor, it may be
necessary to have the water d rained from
the water separator in the
fuel filter more
often than specified in the maintenance
schedule. This can help reduce engine ma l­
funct ions
c:> page 2 3.
Refueling
Fuel filler neck
The fuel filler neck is located on the right rear
side pane l behind the fuel f iller flap.
If the power locking sys tem should fail, you can
still open the flap manua lly -for detai led instruc ­
tions see
c:> page 194.
You can find the fue l tank capacity of you r vehicle
in
c:> page 260.
The label on the inside of the fue l filler flap te lls
you t he cor rect fuel for your vehicle. For more in­
form ation abo ut fue l specifications, see
c:> page 190 .
Your vehicle fuel tank has an on board refue lling
vapor re cove ry system . This feature helps to p re­
ve nt fuel vapors from escaping from the tank and
pollut ing t he environment w hile you refue l yo ur
ve hicle. In orde r to fill the tank p roperly whi le
protecting the environment, please follow this
refueling procedure carefully.
A WARNING
Under normal operating conditions, never ca r­
ry additional fuel containers in your car . Gas
canisters and ot her conta iners used to trans­
port fuel can be dangerous . Such contai ners,
full or empty, may leak and could cause a fire
in a collision. If yo u m ust t ransport fue l to
use fo r yo ur l awn m owe r, snow b lower, etc.,
be very ca re ful and a lways observe loca l and
state laws rega rding the use, transportation
and sto rage of such fuel containe rs . Make cer­
tain the container meets industry standards (ANSI/ASTM F852 - 86).
192
(D Note
Never drive your vehicle until the fue l tank is
complete ly empty . The irregular supply of
f u el can cause misfiring. Gasoline could enter
the exhaust system and damage the catalytic converter.
Fueling procedure
F ig . 149 Righ t rea r ve hicle s ide: open ing t he fuel filler
door
Fi g. 15 0 Fuel fill er doo r wit h attac hed fuel cap
Re ad a nd fo llow the informa tion and war ning s
whe n filling AdB lue
c:> page 195 .
The fuel filler doo r is u nlocked or locked by the
cent ral lock ing system.
Opening the fuel flap
--0 ~
ffl
.,.. Press the left side of the fuel f iller door to open
it -arrow-
c:> fig. 149 .
.,.. Unscrew the tank cap counterclockw ise .
.,.. Place the cap from above on the open fue l filler
door
c:> fig . 150.
Closing the fuel cap
.,.. Turn the f uel cap clockwise until you hear it
lock .
.,.. Close fuel fi ller door until it latches.

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Once the pump nozzle switches off, the fuel tank is "full". Do not fill the tank more. Otherwise the
expansion space in the tank will be filled.
The correct fuel type for your vehicle can be
found on a label located on the inside of the fuel
filler door. For additional information on fuel , re­
fer to ¢
page 190.
The fuel tank capacity of your vehicle is in the
Technical Data ¢ page 260.
To avoid fuel spilling or evaporating from the fuel
tank always close fuel filler cap properly and
completely. An improperly closed fuel filler cap
may also cause the MIL lamp ¢
page 25 to come
on.
A WARNING
Not paying attention when fueling or han­
dling fuel incorrectly can lead to fires, explo­
sions or serious injuries.
- Fuel ignites easily and can cause serious burns and other injuries.
- If you do not switch the engine off when fu­
eling and/or do not insert the fuel no zzle
completely into the tank opening, fuel can
leak out or run over . Leaked fuel can ignite
and start a fire.
- Do no t use the telephone while fueling. The
electromagnetic rays can cause sparks,
which can ignite fuel vapors and start a fire .
- Do not sit in your vehicle while fueling . If
you must make an exception and enter your
vehicle again while fueling , close the door
and touch metal to discharge static electric­
ity before touching the fuel nozzle. Static
electricity can create sparks, which can ig­
nite vapors when fueling.
- Do not smoke or have an open flame in the
area when fueling your vehicle or filling a
fuel container because this increases the
risk of an explosion.
- For your safety, carrying fuel containers in
your vehicle is not recommended. Whether
full or empty, the container can leak and
cause a fire in the event of an accident .
-If you must make an exception and trans­
port a fuel container, note the following:
Checking and Filling
- Never fill the fuel container with fuel
while it is in or on the vehicle . Static elec­
tricity is discharged when filling which can cause the fuel vapors to ignite and increas­
es the risk of an explosion .
- Always place a fuel container on the
ground before filling .
- Always hold the fuel nozzle completely in
the fuel container when filling .
-If the fuel container is made of metal, the
fuel nozzle must always be in contact with
the container when filling it with fuel. This prevents static electricity from discharg­
ing .
- Never spill fuel in the vehicle or the lug ­
gage compartment . Evaporated fuel is ex­
plosive and increases the risk of serious in­
jury or death.
- Follow legal requirements when using,
storing and transporting fuel containers .
- Make sure the fuel container conforms to
industry standards (ANSI/ASTM F852-86).
Q) Note
-Remove spilled fuel from vehicle paint im­
mediately , because it can damage paint .
- Never drive until the fuel tank is completely
empty. The irregular supply of fuel that re­
sults from that can cause engine misfires .
Uncombusted fuel will enter the exhaust
system and increase the risk of damage to
the catalytic converter.
- If the fuel tank runs completely empty in a
vehicle with a
diesel engine, the ignition
must remain switched on for at least 30
seconds after refueling before starting the
engine. It may take longer than usual for
the engine to start, even up to a minute.
This is because the air must first bleed out of the fuel system when starting the engine .
@ For the sake of the environment
- If
the fuel nozzle is used correctly, it will in­
dicate that the tank is full the first time it
switches off automatically. Do not try to add
more fuel, because it can spill over. Also, "'
193

Checking and Fill in g
the expansion space in the tank will fi ll,
which can result in fuel spilling out when it
becomes warm and polluting the environ ­
ment.
(D Tips
- If
the engine is running while fueling, va­
pors can escape or the fuel can spill over.
Because of th is, the fuel nozz le switches off
before th e tank is full.
- Do not fue l the vehicle when the ignition is
switc hed on. Otherwise, the fuel gauge may
not show the correct level after fueling the
vehicle.
- Diesel vehicles are equipped with a diesel
misfueling guard
l). It allows the vehicle to
be fueled on ly w ith a diesel fuel p ump noz­
zle .
- A worn o r damaged nozzle or a nozz le that
i s too sma ll may not be able to open the die­
se l m isfue ling protector. If this is the case,
try turning the no zzle before inser ting it in
the fue l filler neck, use a different fuel
p ump or see an a uthorized Audi dea le r or
a uthorized Audi Service Facility for assis­
tance .
- The misfueling guard does not o pen whe n
adding fue l from a fuel contai ne r. Yo u can
bypass it by adding the diese l fuel s low ly .
- The fuel filler door on your vehicle does not
l ock when you lock the vehicle from the in­
side.
l l Market -spec ifi c
194
Fuel filler door emergency release
If the central locking system is faulty, the fuel
filler door can be unlocked manually .
Fig. 15 1 Rig ht rear luggage compartme nt: emergency re­
lease
The emergency release mechanism is located be­
hind the right side trim panel in the luggage
compartment.
.,. Remove the cover in the side panel.
.,. Loosen the loop from the retainer and then pull
on the loop ca refully-ar row-
c::> 0 . The fuel fill­
er door is released .
.,. To open the fue l filler door, press o n the left
side
opage 192, fig. 149 .
(D Note
Only pull on t he loop u ntil yo u feel resistance.
You will not he ar it release. O therwise you
could damage the emergency rele ase mecha­
nism.
Catalytic converter
App lies to vehicles: with gasoline e ngine
It is very important that your emission control
system (catalytic converter) is functioning prop­
erly to ensure that your vehicle is running in an
environmentally sound manner .
.,. Always use lead-free gasoline c::> page 190, Fuel
supply .
.,. Never run the tank down all the way to empty .
.,. Never put too much motor o il in yo ur engine
o page 203, Adding engine oil 'l:::11 .
.,. Never try to push- or tow-sta rt you r vehicle .

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The catalytic conve rter is an efficient "clean -up"
device bui lt into the exhaust system of the vehi ­
cle. The catalytic converter burns many of the
pollutants in the exhaust gas before they are re­
leased into the atmosphere.
The exclusive use of unleaded fue l is critically im­
portant for the life of the catalytic converter and
proper functioning of the engine .
A WARNING
The temperature of the exhaust system is
high, both when driving and after stopping
the engine.
- Never touch the exhaust tail pipes once they
have become hot. This could result in burns.
- Do not park or operate the vehicle in areas
where the hot exhaust system may come in contact with dry grass, brush, fue l spill or
other material which can cause a fire .
- Do not apply additional undercoating or
rustproofing on o r near the exha ust man i­
fold, exhaust pipes, catalyt ic converte r or
heat s hields. Dur ing driv ing, the subs tance
u5ed for undercoating could overheat and
cause a fire .
(D Note
-Be awa re that just one tank f illing wit h lead­
ed
f uel will a lready se riously degrade the
performance of the c ata lytic conver ter.
- Do not exceed the co rrect engine oil leve l
9page203.
-Do not d rive until the fuel tank becomes
complete ly empty. The eng ine could misfi re.
U nburned f uel co uld also ge t in to the e x­
haust system and this could ca use the cata ­
l ytic converter to overheat.
- Do no t sw itch off the ignition wh ile the vehi­
cle is moving.
- Do not con tinue to oper ate yo ur vehicle un­
der these cond itions, as o therwise fue l can
r each the catalytic converte r. This cou ld re­
su lt in overheating of the converter, requir­
i ng its replacement.
- To assure efficient ope ration of the Emission
Control System:
Checking and Fillin g
- Have your vehicle maintained properly and
in accordance with the serv ice recommen­
dat ions in yo ur Warranty
& Maintenance
booklet.
- Lack of prope r maintenance as we ll as im­
p roper use of the vehicle will impair the
f u nction of the emission control system
and could lead to damage.
@ For the sake of the environment
Even when the Emission Control System is op­
erating properly, the exha ust gas can have a
su lfur-like exhaust gas sme ll under some op­
erating states. Th is depends on the s ulfur
content of the fuel b eing used. Us ing a diffe r­
ent bra nd of fue l may he lp, or fi lling the tank
wi th lead-free su per grade gaso line.
Diesel particulate filter
App lies to vehicles: wit h diese l eng ine
T he diese l part icu late filter filters nearly all of
the soot pa rticles ou t of the exha ust. The filter
cl ea ns itself a utoma tic all y unde r no rm al driving
con dit ions. If the filte r cannot clean itse lf (for ex­
amp le, because yo u are only driving sho rt distan ­
ces), th e fi lter becomes clogged with soot and
the
II symbol for the diese l partic ulate filter il­
l uminates
9page 22.
A WARNING
-Do not park your veh icle over flammable
materials such as grass or leaves because
the high temperature of the diesel part icu­
la te filte r could sta rt a fi re.
-
- Do not app ly an underbody protectant in the
exhaust system area or a fire cou ld start.
Selective catalytic
reduction
General information
App lies to vehicles: wit h diese l eng ine
In veh icles with selective catalytic reduction, a
u rea solution (AdBlue) is injected into the ex­
haust system before a nitrogen oxide cata lytic
conve rter to redu ce nitrogen emissions.
195

Checking and Fill in g
Ad Blue is the market ing name for Diese l Exhaust
Fl uid (DEF) .
The AdBlue is carried in a separate tank in the ve ­
h icle. The AdB lue usage acco unts for approxi­
mately 0.5% to 1.2% of the diesel fuel that is
used .
When a message about refil ling the Ad Blue ap­
pea rs in the instrument cluster disp lay, yo u must
refill the AdBlue yourself or have it refilled by an
authorized Aud i dealer or authorized Audi Se rvice
Facility ¢
page 197 .
A WARNING
Failure to heed Ad Blue refill information in
the instrument cluster can prevent the vehicle
from be ing started and driven. If the veh icle
cannot be driven and an emergency arises,
personal in ju ry can occur.
-Always have the Ad Blue tank refilled well before the tank runs d ry.
(D Tips
-
- The instrument cluster display indicates the
distance remaining that can be driven
¢ page 196. If the AdBlue tank is com ­
plete ly empty, the engine w ill not start
again after the ig nition is switched off.
- Ad Blue is required by law to operate this ve­
hi cle.
Messages in the instrument cluster display
Applies to vehicles: with diesel engine
The display indicates if the Ad Blue level is low or
if there is a system malfunction .
Fig. 1 52 In stru ment cl uste r: ind ic a tor in th e disp la y
196
AdBlue level low
You w ill be informed if the Ad B lue in the tan k
drops below a certa in leve l.
Ad Blue /;, Please refill AdB lue . Range
1500 mi (2400 km )
This message appears when there is only enough
AdBl ue left to d rive the distance ind icated in the
drive r information system. Fill the Ad Blue.
AdBlue /9 Refill AdBlue! No restart in
600 mile s (1000 km )! See owner' s manu al
T his message appears when there is only eno ugh
Ad B lue left to drive the distance ind icated in the
dr iver information sys tem. Fill the Ad Blue. Other­
wise the engine w ill not start again if you stop it
once the distance indicated has been driven . As
l ong as the indicator light is on, yo u
can check t he remain ing range in the tr ip com­
p uter*.
Refill Ad Blu e! Engine start not po s­
sible! See owner 's m anual
This message appears w hen the Ad Blue tank is
empty . Fill the Ad Blue. Otherwise you will not be
able to start the eng ine again once you stop it .
The Ad Blue must be refilled when the amount in
the tank has reached the minimum level
¢ page 197, Filling theAdBlue .
¢4 tncorrect filling /system malfuncti on
A message appears if the Ad Blue ta nk was fi lled
with a f lu id other than Ad Blue and the system
has detected that the tank was filled incorrect ly,
or if there is a system malfunction.
AdBlue ./' AdBlue: System fault! No restart in
600 miles (1000 km ). See owner's manual.
This message appears when it is on ly possible to
drive the distance indicated in the driver informa ­
tion system . Drive to the nearest authorized Aud i
dealer or author ized A udi Service Facility to have
the malfunct ion corrected. O therwise the engine
will not sta rt again if you stop it once the dis­
tance indicated has been d riven .
Ad Blue: system fault . Engine start
not possible! See owner 's manual

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This message appears if the system has detected
that the tank was filled incorrectly or that there
is a malfunction. Drive immediately to the near­
est authori zed Aud i dealer or authori zed Audi
Service Facility to have the malfunction correct­
ed . Otherwise you will not be able to start the en­
g in e again once you stop it.
Filling the Ad Blue
Applies to vehicles: with selective catalyt ic red uctio n
A special refill bottle must be used to fill the
AdBlue.
Fig. 153 Right rear vehicle s ide: removing the Ad B lue cap
Fig. 154 Ad Blue filler tube: inserting the refi ll bott le
The Ad Blue tank opening is located near the die­
sel tank opening. Add at least 1 gallon (3.8 lit ­
ers) of AdBlue (two bottles). This is the minimum
amount required to ensure the system detects
the refilling and to start the engine. You can add
a maximum of approximately 4 gallons (15 lit­
ers) .
Opening the filler tube and adding AdBlue
Requirement: the request to add Ad Blue must
appear in the instrument cluster display.
• Park your vehicle on a level surface.
• switch the ignition off .
Checking and Filling
• Open the tank door q page 192.
• Tur n the cap on the tank opening to the left to
remove
q fig. 153.
• Remove the cap from the refill bottle.
• Position the refill bottle on the filler tube and
turn the bottle clockwise until it stops turning
@ qfig. 154.
• Press lightly against the bottom of the bottle
@ to empty it. Con tinue pressing the bottom
of the bottle unti l it is empty or until flu id
stops flowing into the tank.
• Turn the bottle to the left without pressing on
the bottom.
Closing the filler neck
• Turn the Ad Blue cap to the right on the filler
tube until the cap clicks into place.
• 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 filled.
• If there was no Ad Blue left in the tank and a
range of
O mi (0 km ) was displayed in the in­
strument cluster, switch the ignition on fo r
about 30 seconds before start ing the engine.
_& WARNING
=
Ad Blue can irritate the skin, eyes and respira-
tory system . If there is contact with the fluid,
flush immediate ly with plenty of water. Con­
sult a physician if necessary.
(D Note
- Only use Ad Blue that conforms to the
standard ISO 22241-1. Do not mix any addi­
tives with the Ad Blue and do not dilute it
with water.
- Do not add AdBlue to the diese l tank or add
diesel fuel to the Ad B lue tank. Mixing can
lead to damage to the engine and the Ad Bl­
ue tank system. Warranty does not cover
damage caused by this .
- Ad Blue attacks surfaces such as painted ve­
hicle components, plastic and carpet. Re-
move the fluid as quickly as possible with a ..,.
197