2018 AUDI A3 SEDAN check engine

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Telephone Introduction
Applies to: vehicles with telephone
To make phone coils in your vehicle using the
MMI, connect your cell phone to the MMI via
Bluetooth.
Handsfree
After you have connected your ce ll phone to the
MMI via Bluetooth, you can use the handsfree
system and operate telephone functions through
your MMI. You can make calls using the antenna
on your cell phone.
A WARNING
-Medical experts warn that cell phones can
interfere w ith the funct ion of pacemakers .
Always ma inta in a m inimum distance of
about 8 inches (20 cm) between the cell
phone antenna and the pacemake r.
-Do not carry the cell phone in a pocket di­
rectly over the pacemaker when the phone
is switched on.
-Sw itch the cell phone off immediately if
you suspect it may be interfering w ith the
pacemaker.
-Do not use the voice recognition system*
¢ page 170 in emergencies because your
voice may change in stressful situations. It
may take longer to dial the number or the
system may not be able to dial it at all. Dial
the emergency number manually.
-Switch your cell phone off in areas where
there is a risk of an exp losion. These loca­
t ions are not always clearly marked. This
may include gas stations, fuel and chemical
storage facilities or transport vehicles, or lo­
cations where fue l vapors (such as propane
or gasoline vapor in vehicles or bui ldings),
chem icals or large quantities of dust parti­
cles (such as flour, sawdust or metal) may
be present in the air. Th is also applies to all
ot her locations where you would normally
turn your vehicle engine off.
-The demands of traffic require your full at­
tention. Always read the chapter
¢ page 154, Traffic safety information.
-
Telephone
@ Note
Always fo llow the information found in Q@ in
Wi -Fi hotspot on page 195.
(D Tips
-The Bluetooth connection range is limited
to inside the vehicle . It can a lso be affected
by loca l conditions and interference with
other devices.
-T o learn which Bluetooth connections and
which of the functions in your cell phone are
supported, check with your cell phone serv­
ice provider or the database for mobile devi­
ces at www .aud iusa .com/bluetooth.
Setup
Connecting a cell phone using Bluetooth
Applies to: vehicles with telephone
Fig. 173 Display in g t he PIN for enter ing in t he cell p hone
Requirement
T he vehicle must be stationary and the ignition
must be switched on.
T he Bl uetoo th settings must be open on your cell
phone during the connection setup .
T he Bluetooth funct io n and v is ibilit y of the MMI
Q page 246 and cell phone must be switched on.
The cell phone to be connected must not be con­
nected to any other Bluetooth device.
The MMI must not be connected to a cell phone.
Connecting a cell phone
.,. Select: IMENU I button> Telephone> Connect
mobile device > Find new devices > Next.
The
avai lab le Bluetooth devices are shown in the In-
fotainment system display.
Or select: I MENU I II>-
177

Checking and Filling
Checking and Filling Fuel
Gasoline grade
A pp lies to: ve hicles w ith gasoline engines
The correct gasoline grade is stated on the inside
of the fuel filler door .
The vehicle is equipped with a catalytic converter
and must only be driven with
unleaded gasoline .
Audi recommends using TOP TIER Detergent Gas­
oline. Additional information on TOP TIER Deter­
gent Gasoline can be found on the official web­
site (www .toptiergas.com).
The individual gasoline grades are differentiated
by
octane ratings. This value is given with (R +M)/
2 equating to AKI or in RON.
The following headings match the corresponding
sticker in the fuel filler door .
UNLEADED FUEL ONLY MIN. (R+M)/2 87
Regular/ MIN. RON 91 Regular
Use regular gasoline with minimum 87 AKI/
91 RON
i::>@ .
The max imum eng ine power is only reached if
p rem ium gasol ine 91 AKI/ 95 RON is used.
UNLEADED FUEL ONLY PREMIUM MIN. (R
+M)/2 91 / SUPER MIN. RON 95
Using premium gaso line with minimum 91 AKI/
95 RON is recommended.
If premium gasoline is not available, you can also use regular gasoline 87 AKI/ 91 RON . However
this does reduce th e engine powe r slight ly.
0 Note
- Fillin g the tank just one time with leaded
fuel or other metallic additives will cause
permanent deter iorat ion to the catalytic
converter function.
- When gasoline with an octane rat ing that is
too low is used , h igh speeds or heavy engine
load can lead to engine damage.
314
(D Tips
The vehicle may be filled with fuel that has a
h igher octane rating than what is required by
the eng ine.
Blended gasoline
App lies to : vehicles wi th gaso line e ngi ne
Use of gasoline containing alcohol or MTBE
(methyl tertiary butyl ether)
You may use unleaded gasoline blended with al ­
cohol or MTBE (commonly referred to as oxygen­
ates) if the blended mixture meets the following
criteria:
Blend of gasoline methanol (wood alcohol or
methyl alcohol)
- 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 gasoline and ethanol (grain alcohol or
ethyl alcohol)
-Anti-knock index must be 87 AK I or h igher.
- Blend must not conta in more than 15% etha-
nol.
Blend of gasoline and MTBE
- Anti -knock index must be 87 AKI or higher.
- Blend must not contain more than 15% MTBE.
Seasonally adjusted 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 that you
fill up at busy gas stat ions where the seasonal
adjustment is more lik ely to be made in t ime.
@ Note
- Methanol fuels which do not meet these re­
quirements may cause corrosion and dam­
age to plastic and rubber components in the
fuel system.
- Do not u se fue ls that fail to meet the speci-
fied criteria in this chapter.
...

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-If you are unable to determine whether or
not a particular fuel 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 fuels differ­
ent from those specified are not the respon­
sibility 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 blends, we
recommend that you switch to unblended
fuel.
Gasoline additives
A major concern among many auto manufactur­
ers is carbon deposit build-up caused by the type
of gasoline you use.
Although gasoline grades differ from one manu ­
facturer to another, they have certain things in
common. All gasoline grades contain substances
that can cause deposits to collect on vital engine
parts, such as fuel injectors and intake valves.
Al­
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 official website
(www.toptiergas .com) .
After an extended period of using inadequate
fuels, carbon deposit build-ups can rob your
en­
gine of peak performance.
(D Note
Damage or malfunction due to poor fuel qual­
ity is not covered by the Audi New Vehicle
Limited Warranty.
Checking and Filling
Refueling
Fueling
Applies to: vehicles without plug-in hybrid drive
Fig. 260 right rear side of the ve hicle: open ing the fuel
filler door
Fig. 261 Fuel filler door with attached fuel cap
Plug-in hybrid drive*: refer to the information un­
der ¢pag e 103, Refueling .
The fuel filler door is unlocked or locked by the
central locking system.
.,. Applies to: vehicles with plug-in hybrid drive:
note the information
on¢ page 103, Opening
the fuel filler door.
.,. Applies to : vehicles without plug-in hybrid
drive: to open, press on the left side of the fuel
filler
door¢ fig. 260 .
.. Unscrew the tank cap counterclockwise .
.,. Place the cap from above on the open fuel fille r
door ¢
fig. 261.
.,. Insert the fuel pump nozzle all the way into the
fuel filler neck.
.,. Begin fueling. Once the fuel pump nozzle turns
off the first time, the fuel tank is full. Do not
continue fueling, or else the expansion space in
the tank will be filled with fuel.
.,.
315

Checking and Filling
~ After the fuel pump has switched off, wait five seconds before removing it to allow the rest of
the fuel to finish dripping into the fuel tank.
~ Turn the fue l cap clockwise until you hear it
lock.
~ Close the fuel filler door and then press on the
left side until it latches .
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,
see
Qpage 314 .
For the tank capacity in your vehicle, refer to the
Technical Data
Qpage 382.
To reduce the risk of fuel leaking out or vapors
escaping, make sure that the fuel tank is closed
correctly. Otherwise
thP ¢..iff indicator light will
turn on.
If the centra l locking system malfunctions, the
fuel filler door may emergency release
Qpage317.
A WARNING
An improper fueling procedure and improper
handling of fuel can lead to explosions, fires,
severe burns and other injuries.
-Do not smoke and keep away from open
flames.
-The ignition must be switched off when re­
fueling.
-Cell phones, radio devices and other radio
equipment should always be switched off
when refueling. Electromagnetic rays could cause sparks and start a fire.
-If you do not insert the fuel pump nozzle all
the way into the filler tube, then fuel can
leak out. Spilled fuel can ignite and start a
fire.
-Never get into the vehicle when refueling. If
there is an exceptional situation where the
vehicle must be entered, close the door and
touch a metal surface before touching the
fuel pump nozzle again. This will reduce the
risk of electrostatic discharge that can cause
flying sparks. Sparks can start a fire when
refueling.
316
A WARNING
We recommend that you do not transport any
fuel containers in the vehicle. Fuel could leak
out of the container and ignite, especially dur­
ing an accident. This can cause explosions,
fires and injuries.
-If you must transport fuel in a fuel contain­
er, please note the following:
-Always place a fuel container on the
ground before filling. Never fill the fuel
container with fuel while it is in or on the
vehicle. Electrostatic charge can occur
while refueling and the fuel vapors could
ignite .
-For fuel containers made of metal, the
fuel pump nozzle must always maintain
contact with the container to reduce the
risk of static charge.
-Insert the fuel pump nozzle as far as pos­
sible into the filler opening while refuel­
ing.
-Follow legal requirements when using,
storing and transporting fuel containers.
-Make sure that the fuel container meets
the industry standards, for example ANSI
or ASTM F852-86.
@ Note
-Remove fuel that has overflowed onto any
vehicle components immediately to reduce
the risk of damage to the vehicle.
-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.
@I For the sake of the environment
Do not overfill the fuel tank, otherwise fuel
can leak out when the vehicle is warming up.
© Tips
The fuel filler door on your vehicle does not lock if you lock the vehicle from the inside us-
ing the central locking switch.
II>-

Checking and Filling
-Do not a pply u nder body protectant in t he
exhaust system area, because this increases
the risk of fire.
On Board Diagnostic
System (OBD)
The On-Board Diagnostic System monitors the
engine and transmission componen ts that influ ­
ence emissions.
F ig . 2 64 Footwell o n left s ide o f th e veh icle : co nn ect io n
port fo r the O n-Boa rd D iagno stic Syste m (OBD)
On-Board Diagnostic System
Engine data can be read out at the On-Board D i­
agnostic System connec tion po rt usi ng a special
tes ting device
~ fig . 264.
Indicator light
If thP ¢.j indicato r light bli nks or tu rns o n, there
is a malfunction that is causi ng poor emissions
qua lity and tha t could damage the ca talytic con­
ve rte r.
Drive s lowly to an author ized A udi dealer or au ­
thor ized Audi Se rvice Facility to have the ma l­
function co rrected .
The indicator light can also tur n on if t he fuel fill­
er cap is not closed
correct ly ~ page 315.
A WARNING
Incorrect use of the connection port fo r the
O n- Board Diag nostic System can ca use mal­
functions, which can then result in ac ciden ts
and ser ious injuries.
-Only allow a n author ized Audi dealer or au­
t h o riz e d Aud i Ser vice Faci lity to re ad o ut the
engi ne dat a.
318
-
Engine compartment
Working in the engine compartment
Special care is required if you are working in the
engine compartment
For work in the engine compartment, such as
checking and fill ing fluids, there is a risk of in­
jury, scalding, accidents , and burns . For thi s
reason, follow all the w arnings and general
safety p re caut ion s prov ided in the following in­
formation. The engine compartment is a dan­
gerous are a.
~ .&,.
A WARNING
To reduce the ris k of injur ies, comp lete the
follo wing steps before opening t he hood:
- Tur n t he engine off.
- Switch the igni tio n off.
- Set the park ing brake.
-Move the selector lever into the P position.
-N ever open the hood when there is steam o r
coo lant escaping from t he engine compart­
ment, because there is a risk that yo u could
be burned . Wait unt il no steam or coolant is
escapi ng.
- L et the eng ine cool down .
-Keep children away from the eng ine com-
pa rtment .
-Never sp ill fluids on a hot engine . These flu­
ids (such as the anti-freezing agent con­
tained i n the coolant) ca n ignite .
- Avoid short c ircuits in the electrical system .
-When working in the engine compa rtment,
remember that the radiator fan can switch
on even if the ignition is switched off, wh ich
increases the r isk of persona l injury .
-Never open the cap on the coolant expan­
sion tan k when t he engine is warm . The
coo ling system is under p ressure.
-To protect your face, hands , and a rms from
hot steam or coolant , cover the cap wit h a
large cloth when op ening .
-Do not remove the engine cover under any
circumstances. This increases the r isk of
burns .

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-If tests need to be performed with the en ­
gine running, there is additional danger due
to moving components (such as the ribbed belt, alternator and radiator fan) and from
the h igh-voltage ign it ion system .
- Never reach into the radiator fan. The elec­
tric auxiliary fan is controlled by tempera ­
ture and can switch on suddenly .
- Do not under any circumstances activate the
throttle inadvertently (for example, by hand
from the eng ine compartment) if the vehi­
cl e is stationa ry but the engi ne is ru nning
and a gear is engaged. Ot herw ise, the vehi­
cl e w ill sta rt to move immediately and t his
cou ld res ult in an accident .
- Pay atte ntion to the fo llow ing war nings list ­
ed when work on the fuel system or on the
electrical eq uipment is required.
- Do not smoke .
- Never work near open flames.
- Always have a working fire extinguisher
nearby.
- All work on the battery or e lectrica l system
in yo ur vehicle can res ult in injuries, chemi­
ca l burns, accidents or burns. Because of
this, all work must be performed
onl y by an
authorized Audi dealer or authorized Aud i
Service Facility .
- To reduce the risk of e lectric shock and in­
jury, never touch the following components when the eng ine is r unning or is being start­
ed:
- Ignition cable
- Other componen ts i n the ele ct ronic high-
voltage ignition system
- If you mus t check o r perfo rm wor k on t he
engine while it is runn ing:
- Set the parking brake and p lace the se lec­
tor lever in the P (park) position first .
- Always proceed with extreme caut ion so
that clothing, jewelry or long ha ir do not
become caught in the radiator fan, fan
belt o r other moving components or do
not come into contact with hot compo­
nents. Tie back lo ng ha ir before beginni ng
wo rk and do no t wear clot hing t hat can
hang down into the engine .
Check ing and F illing
- Limit your exposure to exhaust and chemi ­
cals to as short a time as possible
c> A .
A WARNING
-Ca lifornia Proposition 65 Warning:
- Engine exhaust, some of its constituents,
and certa in vehicle components conta in or
emit chemicals known to the State of Cali­
fornia to cause cancer and birth defects and reprod uctive harm . In add ition, certain flu­
ids conta ined in vehicles and certa in prod­
ucts of component wea r contain or em it
chemi cals know n to the State of Californ ia
t o cause cancer and b irth de fe cts or othe r
reprod uctive harm .
- Batte ry posts, te rm inals a nd rela ted a cces­
sor ies conta in lea d and le ad compo unds,
chemicals known to the State o f Cali fornia
to cause cancer and reproductive harms.
Was h hands after handling.
(LlJ) Note
When filling fluids, be su re not to m ix t he flu­
ids up . Otherwise severe malfunctions and en ­
gine damage will occur.
@ For the sake of the environment
You should regu lar ly check t he g ro u nd under
your vehicle in order to detect leaks quick ly . If
there are visib le spots from oi l o r other fluids,
bring your veh icle to an authorized A udi deal ­
er or authori zed Aud i Serv ice Facility to be
checked.
319

Checking and Filling
Opening/closing the hood
The hood is released from inside the vehicle .
Fig. 265 Sect ion from th e driver's side footwell: release
l ever
F ig. 266 Rocker switc h under the hood
Read and foll ow all WARNINGS before checking
anyth ing in the eng ine compartment
~ page 318, Working in the engine comport­
ment .
Make sure the wiper arms are not raised up from
the windshield . Otherwise the pa int could be
damaged .
Opening the hood
Applies to vehicles w ith plug-in hybrid dr ive:
switch the ignition off before re leasing the hood
320
so that the gasoline engine does not start auto­
matically .
.,. With the drive r's door open, p ull the lever be­
low the instrument pane l in the d irec tion of the
arrow ~ fig. 265 .
... Raise the hood slightly c:> .&, .
... Press the rocker switch under the hood upward
<=:> fig. 266. This releases the catch .
... Open the hood .
Closing the hood
... Push the hood down unti l you override the
force of the strut.
... Let the hood fall lightly into the latch . Do not
press it in.
<=:> .&, .
A WARNING
-Never open the hood when there is steam or
coolant escaping from the engine compart­
ment, because there is a risk that yo u could
be burned. Wait unt il no steam or coolant is
escaping.
- For safety reasons, the hood m ust always be
closed securely while driv ing. Because of
this, always c hec k t he hood after closing i t
to make sure it is latched correctly. The
hood is latched if the front corners cannot
be lifted.
- If you no tice that the hood is not latched
while you are driving, stop immediate ly and
close it, because driving when the hood is not latched increases the risk of an accident .
-If the hood is not latched comp letely, it
could f ly up wh ile you are driving and ob­
struct your vision.

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Checking and Filling
Engine compartment overview
The most important check points .
Fig . 267 Typical location of the reservoi r, engine oil d ipst ick, and engine oil f iller open ing
(D Coolant expans ion tank (-L) ¢ page 325
@ E ngine oi l dipstick¢ page 322
® Engine oil filler opening ("e::r.) ¢ page 322
@ Eng ine oi l label* w ith VW standard
¢ page 321
® Brake fluid reservoir (0}) ¢ page 326
@ Applies to: vehicles w ith jump start point(+):
jump start point(+) under a cover
¢page 327, ¢page 375
0 Applies to: vehicles with the vehicle battery
in the engine compartment: vehicle bat­
tery(+) under the battery
cover¢ page 327,
¢page375
@ Bodygroundpoint(-) ¢page327,
¢ page375
® Washer fluid reservoir (0) ¢ page 328
@ Fuse housing ¢ page 3 71
The oil dipstick( @) and the engine oil fi ller
opening( @)¢ fig. 267 may be located in differ- ent places within the engine compartment de­
pending on the engine version .
,8. WARNING
Read and follow a ll WARNINGS before check­
i ng anything in the engine compartment
¢page 318 .
(D Tips
Applies to: vehicles with p lug-in hybrid dr ive:
note the informa tion for the coo lant expan­
s io n t ank
in¢ page 102 and for the vehicle
batte ry (+) in
¢page 102 .
Engine oil
If the engine oil level is too low
If you need to add engine oil, use an o il that i s
listed on the st icker .
The sticker is located at the
front of the eng ine
compartment ¢ page 321,
fig. 267.
321