ECU AUDI A3 2020 Owner´s Manual

Child safety

» Applies to: Sportback: Unlock the backrest and
fold it slightly forward > page 62, Increasing
the cargo area and locate the tether anchor be-
hind the rear seat backrest.
» Applies to: Cabriolet: Unlock the backrest and
fold it slightly forward > page 63, Pass-
through and locate the tether anchor behind
the rear seat backrest.
> Guide the upper tether strap under the rear
head restraint (raise the head restraint if neces-
sary) > fig. 238. For child restraints with V-
tether straps, always make sure that the head
restraint guide rods do not interfere with any
part of the top tether strap.
> Attach the tether strap anchorage hook into the
opening of the tether anchorage.
> Pull on the tether strap hook so that the spring
catch of the hook is engaged.
> Straighten the backrest back up into its upright
position and press it firmly into the locking
mechanism.
>» Tighten the tether strap firmly following the
child restraint manufacturer's instructions.
Releasing the tether strap
> Loosen the tension on the straps following the
child restraint manufacturer's instructions.
> Depress the spring catch on the hook and re-
lease it from the anchorage.
Remember: Use tether straps to help keep the
child restraint firmly in place.

ZA WARNING
Improper use of the LATCH system can in-
crease the risk of serious personal injury and
death in an accident.
— These anchors were developed only for child
safety seats using the “LATCH” system.
— Never attach other child safety seats, belts
or other objects to these anchors.
— Always make sure that you hear a click when
latching the seat in place. If you do not hear
a click the seat is not secure and could fly
forward and hit the interior of the vehicle, or
be ejected from the vehicle.


Z\ WARNING
Improper installation of child restraints will
increase the risk of injury in an accident.
— Always follow the child restraint system
manufacturer's instructions for proper in-
stallation of the child restraint system and
proper use of tether straps as well as the
lower anchorages or safety belts in your ve-
hicle.
— Always read and heed the important infor-
mation and WARNINGS about child safety
and the installation of child restraint sys-
tems > page 278, Child safety.

Using tether straps on rearward-facing
child restraints

Currently, few rear-facing child restraint systems
come with a tether. Please read and heed the
child restraint system manufacturer's instruc-
tions carefully to determine how to properly in-
stall the tether.

Z\ WARNING
A child in a rearward-facing child safety seat
installed on the front passenger seat will be
seriously injured and can be killed if the front
airbag inflates - even with an Advanced Airbag
System.
— The inflating airbag will hit the child safety
seat or infant carrier with great force and
will smash the child safety seat and child
against the backrest, center armrest, or
door.
— If you must install a rearward facing child
safety seat on the front passenger seat be-
cause of exceptional circumstances and the
PASSENGER AIR BAG OFF light does not
come on and stay on, immediately install
the rear-facing child safety seat in a rear
seating position and have the airbag system

inspected by your Audi dealer.


296

Checking and Filling

> With the door open, pull the lever > below
the instrument panel in the direction of the ar-
row > fig. 246.
> Raise the hood slightly > A\.
> Press the rocker switch under the hood upward
> fig. 247. This releases the catch.
> Open the hood.
Closing the hood
> Push the hood down until you override the
force of the strut.
> Let the hood fall lightly into the latch. Do not
press it in. > /\.
Message
2 Warning! Hood is not locked. Stop vehicle
and check the lock
The hood latch is not locked correctly. Stop im-
mediately and close the hood.


AN WARNING
— Never open the hood when there is steam or
coolant escaping from the engine compart-
ment, because there is a risk that you could
be burned. Wait until no steam or coolant is
escaping.
— For safety reasons, the hood must always be
latched securely while driving. 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 lift-
ed.
— If you notice that the hood is not latched
while you are driving, stop immediately and
close it, because driving when the hood is
not latched increases the risk of an accident.
— If the hood is not latched completely, it
could fly up while you are driving and ob-
struct your vision.


D) The &> symbol on the lever was still being designed at
the time this manual was printed.
306

Checking and Filling

Observe the safety precautions > A\ in General
information on page 304.
> Turn the engine off.
> Open the hood = page 305.
> Unscrew the cap %~ for the engine oil filler
opening > fig. 250.
> Carefully add 0.5 quart (0.5 liter) of the correct
oil > page 307.
> Check the oil level again after two minutes
=> page 308, Checking the engine oil level.
> Add more oil if necessary.
> Close the engine oil filler cap and push the dip-
stick
all the way in.
> Close the hood > page 305.

Z\ WARNING
—When adding oil, do not let oil drip onto hot
engine components. This increases the risk
of a fire.
— You must seal the cap on the oil filler open-
ing correctly so that oil does not leak out on-
to the hot engine and exhaust system when
the engine is running, because this is a fire
hazard.
— Always clean skin thoroughly if it comes into
contact with engine oil.
—
Engine oil is poisonous and must be kept out
of reach of children.
— Store the engine oil securely in the original
container.

() Note
— The New Vehicle Limited Warranty does not
cover damage or malfunctions if the recom-
mended intended use of the vehicle and
maintenance measures listed in the Audi
Owner's Manual and the Warranty & Main-
tenance Booklet were not followed.
— Only use high-grade engine oil that explicit-
ly meets the Audi oil quality standard for
your vehicle. Using another oil may cause
severe vehicle damage.
— Do not mix any additives with the engine oil.
Additives may cause engine damage that is
not covered by your New Vehicle Limited
Warranty.
310
@) For the sake of the environment
— Oil should never enter the sewer system or
come into contact with the ground.
— Follow the legal regulations in the country
where you are located when disposing of
empty oil containers.
Changing engine oil
We recommend having the oil changed at an au-
thorized Audi dealer or authorized Audi Service
Facility.
Follow the safety precautions > page 304, Gener-
al information.
The engine oil must be changed at the intervals
specified in the Warranty & Maintenance Book-
let. This is very important because the lubrication
function of the oil gradually declines during regu-
lar vehicle operation.
The engine oil should be changed more frequent-
ly under certain circumstances. Have the oil
changed more frequently if you often drive short
distances, your vehicle is predominantly in stop-
and-go traffic situations, is in very dusty environ-
ments, or is operated for long periods of time in
temperatures below zero.
Cleansing additives in the oil make fresh oil ap-
pear darker after the engine has run briefly. This
is normal and no reason to change the engine oil
more frequently than recommended.
Because correctly disposing of engine oil is diffi-
cult and special tools and technical knowledge
are needed for an oil change, having your engine
oil changed by an authorized Audi dealer or au-
thorized Audi Service Facility is recommended.
If you change the engine oil yourself, please note
the following important information:

ZA\ WARNING
If you change the engine oil on the vehicle
yourself, the following precautions must be
followed:
— Wear protective eyewear.
— Due to the risk of scalding, allow the engine
to cool down sufficiently.

8V2012721BK
Checking and Filling

> Check the coolant level in the coolant expan-
sion tank > page 307, fig. 248 using the outer
markings (2) > fig. 252. The coolant level must
be between the markings (2) when the engine is
cold. When the engine is warm it can be slight-
ly above the upper marking.
Adding coolant
Applies to: vehicles with plug-in hybrid drive:
Your vehicle has two coolant expansion tanks
that are separate from each other. The smaller of
the two expansion tanks must not be opened
= page 312. Read and follow the important safe-
ty precautions > A\ in Coolant on page 312.
Requirement: there must be a residual amount of
coolant in the expansion tank >@).
If you must add coolant, use a mixture of water
and coolant additive. Mixing the coolant additive
with distilled water is recommended.
> Allow the engine to cool.
> Place a large, thick towel on the coolant expan-
sion tank cover.
> Remove the cover (@) © fig. 252 carefully to the
left > AX.
» Add the correct mixture ratio of coolant
> page 311 up to the upper marking @
> fig. 252.
> Make sure that the fluid level remains stable.
Add more coolant if necessary.
> Close the cap securely.
Coolant loss usually indicates that there is a leak.
Immediately drive your vehicle to an authorized
Audi dealer or authorized Audi Service Facility
and have the cooling system inspected. If the
cooling system is not leaking, coolant loss can re-
sult from the coolant boiling due overheating
and then being forced out of the cooling system.

— Never open the hood if you can see or hear
steam or coolant escaping from the engine
compartment. This increases the risk of
burns. The cooling system is under pressure.
When you no longer see or hear steam or
coolant escaping, you may open the engine
compartment with caution.
—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.
— Coolant additive and coolant can be danger-
ous to your health. For this reason, store the
coolant in the original container and away

from children. There is a risk of poisoning.

@) Note
Do not add coolant if the expansion tank is
empty. Air could enter the cooling system and
damage the engine. If this is the case, do not
continue driving. See an authorized Audi deal-
er or authorized Audi Service Facility for assis-
tance.
Brake fluid

BFV-0229)



Z\ WARNING
— The engine compartment in any vehicle can
be a dangerous area. Stop the engine and al-
low it to cool before working in the engine
compartment. Always follow the informa-
tion found in > page 304, General informa-
tion.


Fig. 253 Engine compartment: cap on brake fluid reservoir
Observe the safety precautions > page 304, Gen-
eral information.
Checking the brake fluid level
Read the brake fluid level on the brake fluid res-
ervoir > page 307, fig. 248. The brake fluid level
must be between the MIN and MAX markings
>A.
The brake fluid level is monitored automatically. >
313

8V2012721BK
Checking and Filling

Battery
eae mee eles)
Because of the complex power supply, all work on
batteries such as disconnecting, replacing, etc.,
should only be performed by an authorized Audi
dealer or authorized Audi Service Facility > A\.
Multiple batteries with different technologies
may be installed in your vehicle:
— Vehicle battery (for example, for starting the
engine, basic power supply) > page 315, Lead
battery or > page 316, Other battery types
— Auxiliary battery (for example, for recuperation
or optional equipment) > page 316, Other bat-
tery types
— Applies to: plug-in hybrid drive: High-voltage
battery (for example, for electric driving)
=> page 96.
Not running the vehicle for long periods of
time
The battery will gradually drain if the vehicle
does not run for long periods of time. To ensure
that the vehicle can still be started, the electrical
equipment will be reduced or switched off
=> page 82. Some convenience functions, such as
interior lighting or power seat adjustment, may
not be available under certain circumstances.
These convenience functions will be available
again once you switch the ignition on and start
the
engine.
Even when electrical equipment is switched off,
the equipment can still drain the battery if the
vehicle is not driven for long periods of time.
Deep draining results in a chemical reaction that
destroys the inside of the battery. The battery
must be charged every month to prevent this
= page 316. Contact an authorized Audi dealer or
authorized Audi Service Facility for more infor-
mation.
Winter operation
Cold weather places higher demands on the bat-
tery. This results in reduced starting ability. Have
the battery checked by an authorized Audi dealer
or authorized Audi Service Facility before cold
weather begins.

ZA WARNING
— All work on the battery or electrical system
in your vehicle can result in injuries, chemi-
cal burns, accidents, or burns. Because of
this, all work must be performed only by an
authorized Audi dealer or authorized Audi
Service Facility.
— Never connect the charging cable or jump
start cable directly to your vehicle battery.
Only use the connections in the engine com-
partment > page 316.

Z\ WARNING
California Proposition 65 Warning:
— Battery posts, terminals and related acces-
sories contain lead and lead compounds,
chemicals known to the State of California
to cause cancer and reproductive problems.
Wash hands after handling.


@) Note
If the vehicle will be parked for long periods
of time, protect the battery against the cold
so that it will not be destroyed by “freezing”
= page 316, Charging the battery.
Lead battery
Explanation of warnings:
© Always wear eye protection.
Battery acid is highly corrosive. Always
wear protective gloves and eye protection.
® Fire, sparks, open flame, and smoking are
@/
aa


forbidden.
A highly explosive mixture of gases can
VN form when charging batteries.

Always keep children away from battery
®) acid and the battery.

Always follow the instructions in the oper-
ating manual.


@) For the sake of the environment

¥ Lead-acid batteries must be disposed of
using methods that will not harm the
315

8V2012721BK
Emergency assistance

> Lift the cargo floor using the plastic handle @)
until the cargo floor engages behind the tabs
@ in both side panels > fig. 263 (upper image).
> Fold the cargo floor back before closing the
luggage compartment lid.
Vehicle tool kit and cargo floor cover
Applies to: vehicles with version 2
The vehicle tool kit, tire mobility kit* and com-
pressor* are stored in the luggage compartment
under the cargo floor cover @) > fig. 262.
> Engage the plastic hook () in the luggage com-
partment seal > fig. 263.
> Fold the cargo floor back before closing the
luggage compartment lid.


Z\ WARNING
Applies to: vehicles with jack
Improper use of the vehicle jack can cause se-
rious personal injuries.
— Never use the screw driver hex head to tight-
en wheel bolts, since the bolts cannot attain
the necessary tightening torque if you use
the
hex head, potentially causing an acci-
dent.
— The factory-supplied jack is intended only
for your vehicle model. Under no circum-
stances
should it be used to lift heavy
vehicles or other loads; you risk injuring
yourself.
— Never start the engine when the vehicle is
raised, which could cause an accident.
— Support the vehicle securely with appropri-
ate stands if work is to be performed under-
neath the vehicle; otherwise, there is a po-
tential risk for injury.
— Never use the jack supplied with your Audi
on another vehicle, particularly on a heavier
one. The jack is only suitable for use on the
vehicle it came with.

G) Tips
The vehicle jack* does not require any mainte-
nance.
Vehicle tool kit/tire mobility kit/
eyes
Applies to: vehicles with plug-in hybrid drive
0) Bb + 3
> i a

Fig. 264 Luggage compartment: side trim panel
The vehicle tool kit, tire mobility kit and the com-
pressor are located in the side trim panel @) and
in the luggage compartment.
G) Tips
The vehicle must not be operated without the
tire repair set.
Tire mobility kit
Applies to: vehicles with tire mobility kit
> Read and follow the important safety precau-
tions in > page 348.
> Set the parking brake.
> Move the selector lever into the "P" position.
> Check if a repair with the tire mobility kit is pos-
sible > page 349.
Using the tire mobility kit
Applies to: vehicles with tire mobility kit

B8K-1475



Fig. 265 Tire: tire damage that cannot be repaired
349

8V2012721BK
Emergency assistance


» Wind the jack up further until the flat tire — Do not raise the vehicle until you are sure
comes off the ground > A\. the jack is securely engaged.
— Passengers must not remain in the vehicle
when it is jacked up.
— Make sure that passengers wait in a safe
place away from the vehicle and well away
from the road and traffic.
Position the vehicle jack only under the designat-
ed lifting points on the sill > fig. 271. There is ex-
actly one location for each wheel. The jack must
not be positioned at any other location > AS ©.


An unstable surface under the jack can cause the — Make sure jack position is correct, adjust
vehicle to slip off the jack. Always provide a firm as necessary and then continue to raise
base for the jack on the ground. If necessary the jack.
place a sturdy board or similar support under the
jack. On hard, slippery surfaces (such as tiles) @) Note
use a rubber mat or similar to prevent the jack
from slipping owl, Do not Lift the vehicle by the sill. Position the
vehicle jack only at the designated lifting
A WARNING points on the sill. Otherwise, your vehicle will
be damaged.

— You or your passengers could be injured
while changing a wheel if you do not follow
Peon es imteen ene: Taking the wheel off/installing the spare
— Position the vehicle jack only at the desig- Follow these instructions step-by-step for chang-
nated lifting points and align the jack. ing the wheel.
Otherwise, the vehicle jack could slip and
cause an injury if it does not have suffi-
cient hold on the vehicle.
— A soft or unstable surface under the jack
may cause the vehicle to slip off the jack.
Always provide a firm base for the jack on
the ground. If necessary, use a sturdy
board under the jack.
— On hard, slippery surface (such as tiles)
use a rubber mat or similar to prevent the
jack from slipping.
— Only raise your vehicle with the vehicle
jack provided by the factory. If you use a
vehicle jack for another vehicle, your vehi-
cle can slide and cause injury.
— Changes in load can affect the height of
the vehicle.
— Never start the engine when the vehicle is
raised, which could cause an accident.
— Support the vehicle securely with appro-
priate stands if work is to be performed
underneath the vehicle; otherwise, there is
a potential risk for injury.
—To help prevent injury to yourself and your
passengers:
2 R + 4
0 a

Fig. 273 Changing a wheel: using the screwdriver handle
(with the blade removed) to turn the bolts
6 &
Tt
“ oO oO

~
Fig. 274 Changing a wheel: alignment pin inside the top
hole

After you have loosened all wheel bolts and
raised the vehicle off the ground, remove and re-
place the wheel as follows:


355

8V2012721BK
Emergency assistance

— If you notice that the wheel bolts are corroded
and difficult to turn while changing a tire,
they should be replaced before you check the
tightening torque.
— Replace the flat tire with a new one and have
it installed on your vehicle as soon as possi-
ble. Remount the wheel cover.
Until then, drive with extra care and at reduced
speeds.

ZA WARNING
— If you are going to equip your vehicle with
tires or rims which differ from those which
were factory installed, then be sure to read
the information > page 326.
— Always make sure the damaged wheel or
even a flat tire and the jack* and tool kit are
properly secured in the luggage compart-
ment and are not loose in the passenger
compartment.
—Inan accident or sudden maneuver they
could fly forward, injuring anyone in the ve-
hicle.
— Always store damaged wheel, jack* and
tools securely in the luggage compartment.
Otherwise, in an accident or sudden maneu-
ver they could fly forward, causing injury to
passengers in the vehicle.



Spare tire
General information
Applies to: vehicles with space-saving spare tire (Compact
spare tire)
Fig. 275 Luggage compartment: cargo floor folded up
(versions 1 and 2)

BFV-0231



Fig. 276 Compact spare tire
The spare tire > fig. 276 is intended for short-
term use only. Have the damaged tire checked
and replaced if necessary by an authorized Audi
dealer or authorized Audi Service Facility as soon
as possible.
There are some restrictions on the use of the
compact spare tire. The compact spare tire has
been designed specifically for your type of vehi-
cle. Do not replace it with the spare tire from an-
other type of vehicle. >
357

8V2012721BK
Emergency assistance

> Insert the connector that was removed.
> Applies to: vehicles with subwoofer (version 2):
Slide the lock @ back toward the subwoofer.
> Secure the subwoofer with the bolt.
> Fold the cargo floor cover back into place.
The subwoofer can also be mounted when the
spare tire is not in the spare wheel well.
359

Fuses and bulbs


No. | Equipment No. | Equipment

Clutch sensor, engine start, high-voltage
F49 3
battery, power electronics

F52 F53 Level control system control module


Rear window defogger

The power seats* are protected via circuit break-
ers that automatically switch on after a few sec-
onds after the overload has been reduced.
Fuse assignment - Engine compartment

RAZ-0794)
1 0
&
F:}
vi
6
5
4
5}


Fig. 282 Engine compartment: fuse assignment


No. | Equipment
F3 | Engine control module
FA Engine components, engine cooling, aux-
iliary heater, exhaust treatment

Engine components, fuel tank system
(diesel), CNG cut-off valve
Brake light switch
E5

Fo

Engine components, water pumps, tank
F7 ; . ee cae
system (gasoline engine), electrification

F8
F9
Heat oxygen sensor

Engine components, exhaust door, glow
time control module

F10 | Fuel control module, fuel pump

362
F13 | Transmission fluid pump

F15 |Horn

Power and control electronics, engine
components, ignition coil, options mod-
ule
F1l6

Electronic Stabilization Control (ESC), en-
F17
gine control module

Terminal 30 (voltage reference), battery
F18
es
monitoring

FIO F20
F21
Windshield wipers

Anti-theft alarm system

Automatic transmission

Terminal 50 diagnosis, engine control
F22
module

F23 | Engine start

Vacuum pump, water pump, high pres-
F31. 2
sure pump, fuel injectors

F33
F34
F35
F36
F37
Brake pressure reservoir, recuperation

Brake booster

Climate control system

Left front headlamp

Parking heater


F38 | Right front headlamp

Bulbs
Replacing light bulbs
For your safety, we recommend that you have
your authorized Audi dealer replace any bulbs for
you.
It is becoming increasingly more and more diffi-
cult to replace vehicle light bulbs since in many
cases, other parts of the car must first be re-
moved before you are able to get to the bulb.
This applies especially to the light bulbs in the
front of your car which you can only reach
through the engine compartment.
Sheet metal and bulb holders can have sharp
edges that can cause serious cuts, parts must be
correctly taken apart and then properly put back
together to help prevent breakage of parts and >