2021 AUDI A4 ECU

8W1012721BC
Driver assistance


increased safety provided tempt you into
taking risks. This could increase your risk of
a collision.
— Audi pre sense city does not react to certain
objects, such as animals, crossing or oncom-
ing vehicles, bars, railings, or railcars.
— Audi pre sense may be limited or unavailable
in curves or when it is dark.
— Loose objects can be thrown around the ve-
hicle interior during sudden driving or brak-
ing maneuvers, which increases the risk of
an accident. Store objects securely while

driving.

G) Tips
Certain system functions may not be available
if the ESC is limited or switched off
=> page 114, if there is a malfunction, or if the
hill hold assist* is switched on > page 108.
ON eee Reels
Applies to: vehicles with Audi pre sense front
Audi pre sense front provides the same scope of
functions as Audi pre sense city, with a few ex-
ceptions > page 144. The system has an exten-
sive field of view due to additional sensors that
are installed. Because of this, vehicles that are
braking or traveling significantly more slowly can
be detected earlier and more clearly, depending
on the limits of the system.
The following features apply to Audi pre sense
front:
— Automatic braking interventions are available
at vehicle speeds up to approximately 155 mph
(250 km/h)
—The system does not detect pedestrians

ZA WARNING
— Observe the safety precautions > A\ in Audi
pre sense city on page 144.
— Observe the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 117.
— Audi pre sense front does not react to cer-
tain objects, such as pedestrians, animals,

crossing or oncoming vehicles, bars, railings,
or railcars.
ONT eee
Applies to: vehicles with Audi pre sense rear

Within the limits of the system, Audi pre sense
rear uses data from radar sensors at the rear cor-
ners of the vehicle and calculates the probability
of a rear-end collision with the vehicle behind
you.
Audi pre sense preemptive safety measures can
be initiated if the risk of a collision with the vehi-
cle behind you is detected.

ZA WARNING
— Observe the safety precautions and note the
limits of the assist systems, sensors, and
cameras > page 117.
— Audi pre sense rear does not react to pedes-
trians, animals, crossing objects, and ob-
jects not detected as vehicles.
G) Tips
Audi pre sense rear functions may also switch
off if there is a malfunction in the side assist
system.
Rati
Applies to: vehicles with swerve assist

The swerve assist can help you to steer the vehi-
cle around an obstacle detected in a critical area.
If you avoid an obstacle after the acute warning,
then the swerve assist assists you by applying
slight steering adjustment to correct your steer-
ing wheel angle as long as you are actively steer-
ing. Swerve assist is available at speeds between
approximately 20 mph (30 km/h) and 90 mph
(150 km/h).

ZA\ WARNING
— Observe the safety precautions and note the
limits of the assist systems, sensors, and

cameras > page 117. >

145

Telephone

Telephone
Introduction
Applies to: vehicles with telephone
You can operate various telephone functions easi-
ly through the MMI in your vehicle.
Depending on the country and the vehicle equip-
ment, the following options may be available:
— Connecting a cell phone with Bluetooth
— Using two telephones
— Using the Audi phone box

ZX WARNING
— Medical experts warn that mobile devices
can interfere with the function of pacemak-
ers. Always maintain a minimum distance of
about 7.9 inches (20 cm) between the mo-
bile device antennas and the pacemaker.
— Do not carry the mobile device in a pocket
directly over the pacemaker when the
phone is switched on.
— Switch the mobile device off immediately
if you suspect it may be interfering with
the pacemaker.
— Do not use the voice recognition system*
=> page 26 in emergencies because your
voice may change in stressful situations. The
system may take longer to dial the number
or may not be able to dial it at all. Dial the
emergency number manually.
— Switch your mobile device off in areas where
there is a risk of an explosion. These loca-
tions are not always clearly marked. This
may include gas stations, fuel and chemical
storage facilities or transport vehicles, or lo-
cations where fuel vapors (such as propane
or gasoline vapor in vehicles or buildings),
chemicals or large quantities of dust parti-
cles (such as flour, sawdust or metal) may
be present in the air. This also applies to all
other locations where you would normally
turn your vehicle engine off.
— The demands of traffic require your full at-
tention. Always read the chapter > page 19,
Traffic safety information.

162
@) Note
Read the information about Audi connect, and
be sure to note the connectivity costs section
=> page 173.
@) Tips
— The Bluetooth connection range is limited
to inside the vehicle.
—Aselection of supported Bluetooth devices
can be found in the database for tested mo-
bile devices at www.audi.com/bluetooth.
Setup
Connecting a mobile phone via Bluetooth
Applies to: vehicles with telephone
Requirement: the vehicle must be stationary and
the ignition must be switched on. The Bluetooth
settings must be open on your mobile device dur-
ing the connection setup. The mobile device to be
connected must not be actively connected to any
other Bluetooth device. The MMI must only be
connected to one mobile device.
> Enable the Bluetooth function and visibility on
the MMI = page 213 and the mobile phone.
> Applies to: MMI: Select on the home screen:
PHONE.
> Follow the system instructions. The available
Bluetooth devices will be displayed after sever-
al seconds.
> Press on the desired mobile device in the list of
displayed Bluetooth devices.
> To update the list, press OQ.
A PIN for a secure Bluetooth connection will be
generated.
> Confirm the PIN on your mobile device.
> Follow the system instructions.
> Pay attention to any other system prompts on
the MMI and on your cell phone.
After connecting successfully
The cell phone contacts are automatically loaded
in the MMI. This process can take several mi-
nutes, depending on the number of contacts.
Depending on your cell phone and the connection
type, you can use the following functions:

8W1012721BC
Telephone

Handsfree
Requirement: your cell phone must be connected
to the MMI via a Bluetooth Hands Free Profile
(Bluetooth HFP).
You can use the hands-free system. You can make
calls using the antenna on your mobile device.
Sending and receiving messages
See > page 170.
@ Tips
— Pay attention to any system prompts dis-
played on your mobile device or the MMI,
for example if the system should connect
automatically in the future. Depending on
the mobile device, you may need to down-
load contacts and confirm access to your
messages separately.
— You can also search for the MMI on your mo-
bile device using the Bluetooth device
search.
— You only have to pair your device one time.
Bluetooth devices that are already paired
automatically connect to the MMI when the
Bluetooth function is switched on, when
they are within range, and when the ignition
is switched on. The last connected mobile
device is given first priority.
— You can manage additional settings for con-
nected mobile devices in the Connected de-
vices menu > page 214.
— When leaving the vehicle, the Bluetooth
connection to the mobile device will auto-
matically disconnect. Depending on your
mobile device, phone calls in progress may
be automatically redirected from the MMI
to your mobile device so that you can con-
tinue the call on your phone.
Using two telephones
Applies to: vehicles with telephone, and Audi phone box
You can connect two mobile phones to the MMI
at the same time using the Bluetooth HFP, for ex-
ample a business phone and a private phone. You
can be reached in your vehicle through both mo-
bile phones.
Applies to: mobile devices with Bluetooth Mes-
sage Access Profile (MAP): You can send and re-
ceive messages with both mobile devices
=> page 170.
Connecting another mobile device
Requirement: a mobile device must be connected
to the MMI. The vehicle must be stationary and
the ignition must be switched on. The Bluetooth
settings must be open on your mobile device dur-
ing the connection setup. The mobile device to be
connected must not be actively connected to any
other Bluetooth device.
> Enable the Bluetooth function and visibility on
the MMI = page 213 and the mobile phone.
> Applies to: MMI: Select on the home screen:
PHONE > (°, or
>» Applies to: MMI: Select on the home screen:
SETTINGS > Connected devices > Telephone 1
or Telephone 2 > New connection.
> Follow the system instructions. The available
Bluetooth devices will be displayed after sever-
al seconds.
> Press on the desired mobile device in the list of
displayed Bluetooth devices.
> To update the list, press O.
A PIN for a secure Bluetooth connection will be
generated.
> Confirm the PIN on your mobile device.
> Follow the system instructions.
> Pay attention to any other system prompts on
the MMI and on your cell phone.
After connecting successfully
See > page 162, After connecting successfully.
Switching between two mobile devices
Requirement: phone 1 and phone 2 must be con-
nected to the MMI.
> Applies to: MMI: Select on the home screen:
PHONE > <1.
@) Note
Read the information about Audi connect, and
be sure to note the connectivity costs section
=> page 173.
163

Telephone

Disconnecting a mobile device
Applies to: vehicles with telephone
> To disconnect a Bluetooth device from the MMI,
use the Connected devices menu > page 214.
Using the Audi phone
box
General information
Applies to: vehicles with Audi phone box


Fig. 134 Front center console: Audi phone box with con-
nections
Depending on vehicle equipment, you may be
able to use the following functions with the Audi
phone box:
— Make phone calls using the vehicle’s exterior
antenna
— Charge a mobile device using the USB input
— Charge a mobile device wirelessly
— Reminder signal
Limitations
In some situations, the functions of the Audi
phone box may be limited or temporarily unavail-
able. For example, this may happen if
— There is one more than mobile device in the
Audi phone box
— The mobile device is located in a bag or a pro-
tective case
— There are objects between the Audi phone box
and the mobile device
— The mobile device is not positioned in the cen-
ter of the Audi phone box

Z\ WARNING
Loose objects can be thrown around the vehi-
cle interior during sudden driving or braking

164


maneuvers, which increases the risk of an ac-
cident. Store objects securely while driving.

(@) Note
Applicable to U.S.A.
Operation of the Audi phone box is subject to
the following requirements of the Federal
Communications Commission:
— This is a CONSUMER device.
— BEFORE USE, you MUST REGISTER THIS DE-
VICE with your wireless provider and have
your provider’s consent. Most wireless pro-
viders consent to the use of signal boosters.
Some providers may not consent to the use
of this device on their network. If you are
unsure, contact your service provider.
— You MUST operate this device with approved
antennas
and cables as specified by the
manufacturer. Antennas MUST be installed
at least 20 cm (8 inches) from any person.
— You MUST cease operating this device im-
mediately if requested by the FCC or a li-
censed wireless service provider.
— WARNING: E911 location information may
not be provided or may be inaccurate for
calls served by using this device.
@) Note
Applicable to Canada
In Canada, operation of a Zone Enhancer,
such as an Audi phone box, is subject to the
following requirements of the Innovation,
Science and Economic Development Canada
(ISED):
— This is a CONSUMER device.
— BEFORE USE, you MUST meet all require-
ments set out in CPC-2-1-05. At the time of
printing this user manual, the CPC-2-1-05
client procedures circular of ISED Canada
was available at the following web page:
http://www.ic.gc.ca/eic/site/smt-gst.
nsf/eng/sf08942.html.
— You MUST operate this device with approved
antennas
and cables as specified by the
manufacturer. Antennas MUST NOT be in-
stalled within 20 cm of any person.

Audi connect

Information about the services and the corre-
sponding app was accurate at the time this man-
ual was printed. The scope of services depends
on the country and equipment. There may be
changes over the service life of the vehicle.

ZA WARNING
— Always follow the information found in > AA
in General information on page 173.
— Driver messages, text messages, and illumi-
nated warning and indicator lights in the ve-
hicle always take priority over information
from the Audi connect services. The infor-
mation displayed by the Audi connect serv-
ices should not cause you to take safety
risks. This can result in the vehicle breaking
down in traffic and to serious injuries or ac-
cidents.
G) Tips
— Accessing specific data or controlling func-
tions remotely depends on the charge level
of the vehicle battery. Therefore, these
functions only have limited availability after
switching off the ignition.

— An eSIM card establishes the Internet con-
nection for Audi connect vehicle control
services. The costs for this are included in
the price of Audi connect vehicle control
services. The cell phone network, for exam-
ple, must be available to use these services.
Applies to: vehicles with Audi connect vehicle control
Create a myAudi account by registering in the
myAudi app or at my.audi.com, depending on
your country.
>» Set the key user > page 30.
> Install the myAudi app on your mobile device
and log in with your access information.
@ Tips
Some services require you to enter a 4-digit
PIN that you set up during registration.
176
Settings
Applies to: vehicles with Wi-Fi hotspot
Requirement: the ignition must be switched on.
> Applies to: MMI: Select on the home screen:
SETTINGS > Connection settings > Wi-Fi
Depending on the country and the vehicle equip-
ment, the following functions may be available:
Wi-Fi
When the function is switched on, the MMI's Wi-
Fi hotspot is active and Wi-Fi devices can be con-
nected to the hotspot.
Wi-Fi hotspot settings
The Wi-Fi connection between the MMI and your
Wi-Fi device is encrypted. You can change the fol-
lowing information if needed.
— Access point (SSID): name of the Wi-Fi hot-
spot.
— Password: an initial password was set at the
factory in the MMI. Audi recommends changing
the initial password. Only use secure passwords
that conform to the general guidelines for se-
cure passwords. For more information, refer to
reputable and current sources on password se-
curity.
Allow data connection through Wi-Fi
When the function is switched on, mobile devices
can use the Internet connection through the Wi-
Fi hotspot. A data plan is needed to do this.

ZA\ WARNING
Always follow the information found in > A\
in General information on page 173.
@) Note
Always follow the information found in >@ in
General information on page 173.

8W1012721BC
Media

Media
General information
There may be different media sources and con-
nections available depending on the vehicle
equipment. For example, you can play media files
using a connected USB drive or connect your mo-
bile devices to the Audi music interface and oper-
ate them through the MMI.
Media and format restrictions: the MMI (includ-
ing the USB storage device connection) was test-
ed with a variety of products and media on the
market. However, there may be cases where indi-
vidual devices or media and audio/video files may
not be recognized, may play only with restric-
tions, or may not play at all.
Restricted functionality: reset the MMI to the
factory default settings if functionality is restrict-
ed > page 213.
Digital Rights Management: please note that
the
audio/video files are subject to copyright pro-
tection.
Files that are protected by DRM and are identi-
fied with the symbol f@ will not play.
Data security: never store important information
on mobile devices. Audi is not responsible for
damaged or lost files and media.
Loading times: the more files/folders/playlists
there are on a storage medium, the longer it will
take to load. To reduce the amount of time it
takes the audio/video files to load, use a storage
medium that only contains audio/video files, and
create subfolders (for example, for each artist or
album).
Additional information: when playing, audio
files are automatically displayed with any addi-
tional information that is stored (such as the ar-
tist, track and album cover). If this information is
not available on the medium, the MMI will revert
to the local Gracenote metadata database or
search online if necessary. See > page 207, On-
line additional data. However, in some cases, the
additional information may not be displayed.
CG) Note
Read the information about Audi connect, and
be sure to note the connectivity costs section
=@ in General information on page 173.
Bluetooth audio player
With the Bluetooth audio player, you can play
music wirelessly through the MMI from your
Bluetooth-capable mobile device (such as a cell
phone).
Requirement: the vehicle must be stationary and
the ignition must be switched on. The Bluetooth
settings will open on your mobile device during
the connection setup. The Bluetooth function and
visibility of the MMI > page 213 and mobile de-
vice must be switched on.
Connecting a mobile device
> Applies to: MMI: Select on the home screen:
MEDIA > Source > Connect external device >
New connection. The available Bluetooth devi-
ces will be displayed after several seconds.
> Press on the desired mobile device in the list of
displayed Bluetooth devices.
> To update the list, press OQ.
A PIN for a secure Bluetooth connection will be
generated.
> Confirm the PIN on your mobile device.
After
connecting successfully, the mobile device
will be displayed in the Connected devices menu
as a Bluetooth audio player.
Playing media > page 203.
@ Tips
— Check for any connection requests on your
Bluetooth device.
— Multiple Bluetooth audio players can be
paired with the MMI, but only one at a time
can be active as a Bluetooth audio player
=> page 214.
— The supported media functions (such as
shuffle, list view, categories, search, op-
tions) depend on the Bluetooth device being
used.
201
>

8W1012721BC
Checking and Filling

The hood latch is not locked correctly. Stop im-
mediately and close the hood.
K 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



NY [1
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.



Fig. 159 Typical location of the reservoir and the engine oil filler opening (example)
Observe the safety precautions > page 221.
@ Washer fluid reservoir (>) > page 233
) Jump start points: (+) under the cover
= page 232, Charging the 12 Volt vehicle
battery > page 268, Preparation

Engine oil filler opening (%27) > page 225

Sticker* for engine oil specifications
=> page 224


) Coolant expansion tank (-£) > page 228
Brake fluid reservoir (OC) > page 229
The coolant expansion tank and the engine oil
filling opening may be located in different places
within
the engine compartment, depending on
the engine version.
223

Checking and Filling

> Unscrew the cap %~ for the engine oil filler
opening > fig. 160.
> Carefully add 0.5 quart (0.5 liter) of the correct
oil > page 224.
> Close the engine oil filler opening cap.
> Close the hood > page 222.
> Restart the ignition after two minutes and read
the current oil level in the MMI > page 225,
Checking the engine oil level.
> Applies to: using engine oil that meets the rec-
ommended specification: Add some more en-
gine oil again if necessary.

ZA\ WARNING
— When adding oil, do not let oil drip onto hot
engine components. This increases the risk
of a fire.
— You must close 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.
226
@) 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
Audi recommends having the oil changed at an
authorized Audi dealer or authorized Audi Serv-
ice Facility.
Observe the safety precautions > page 221, Gen-
eral 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, Audi recommends
having your engine oil changed by an authorized
Audi dealer or authorized Audi Service Facility.
If you change the engine oil yourself, please note
the following important information:

Z\ 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. >