2021 AUDI A4 warning light

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
Emergency call

the emergency call button (2) will blink. The
emergency call will be made. The emergency call
cannot be canceled.
LED status
— Green - The emergency call function is availa-
ble.
— Red - There is a malfunction in the emergency
call function. Contact an authorized Audi dealer
or authorized Audi Service Facility. Note the
messages about the availability of the emer-
gency function > page 179.
— Off - The emergency call function is not availa-
ble, perhaps because no network is available.
Warnings
If there is a critical system failure in the emer-
gency call systems, the vehicle occupants will re-
ceive the following warning: see > page 179, LED
status and > page 179, Messages.
@) Tips
If the emergency call is canceled due toa
poor connection, then the system automati-
cally tries to connect again.
Messages
Applies to: vehicles with emergency call function
& Emergency call function: malfunction! Lim-
ited availability. Please contact Service
If this indicator light turns on and this message
appears, the emergency call function is restrict-
ed. For example, you cannot call the emergency
call center, but data may still be transmitted un-
der certain circumstances. Drive to an authorized
Audi dealer or authorized Audi Service Facility im-
mediately to have the malfunction corrected.
&S Emergency call function: malfunction! Func-
tion unavailable. Please contact Service
If this indicator light turns on and this message
appears, you cannot make an emergency call.
Drive to an authorized Audi dealer or authorized

)) The availability of the services offered depends on the
country and may change in the future.
Audi Service Facility immediately to have the
malfunction corrected.
Online roadside
assistance
Applies to: vehicles with online roadside assistance
An online roadside assistance call )) is a combina-
tion of data transmission and a phone call. The
data transmission from your vehicle forwards im-
portant information to the Audi service center,
such as the vehicle and position data.
Cee Te Re tee cary
Applies to: vehicles with online roadside assistance

RAZ-0443



Fig. 138 Front headliner: online roadside assistance but-
ton
Calling online roadside assistance
> Press the button (@). The LED in the button
turns red. The online roadside assistance call
will be made.
> If you press the button () by mistake, then
press it again.
Audi incident assistance
A minor accident may be detected by the vehicle
electrical system. You are able to select between
online roadside assistance and an emergency call
in the MMI. >
179

8W1012721BC
Media



ZA WARNING
Driving requires your complete and undivided
attention. As the driver, you have complete re-
sponsibility for safety in traffic. Never operate
mobile devices while driving, because this in-
creases the risk of an accident.

@) Note
— Pull the cable out of the Audi music inter-
face carefully so that the USB ports are not
damaged.
— Use a USB extension cable to connect devi-
ces that have an integrated USB connector
(such as a USB stick) to reduce the risk of
damage to your USB device and the Audi
music interface.
— Extremely high or low temperatures that
can occur inside vehicles can damage mobile
devices and/or impair their performance.
Never leave mobile devices in the vehicle in
extremely high or low temperatures.
G) Tips
— Always follow the information found in
=> page 82.
—When you switch the ignition off, the USB
ports are still supplied with power until the
energy management intervenes.
— Do not use an additional adapter cable or
USB extension cable to connect mobile devi-
ces to the Audi music interface that already
have a cable or that must be connected with
a USB adapter cable (9 page 202, fig. 150).
Using an additional adapter or US extension
cable may impair functionality.
— Functionality is not guaranteed for mobile
devices that do not conform to the USB 2.0
specification.
— USB hubs are not supported.
— Video playback through the Audi music in-
terface is not supported on Apple devices
and MTP devices (such as smartphones).
— iPod touch or iPhone malfunctions also af-
fect the operation of the MMI. Reset your
mobile device in these situations.
— Audi recommends updating the iPod touch
or iPhone software to the latest version. Re-
fer to your mobile device owner's manual
for more information.
— The USB adapter on the Audi music inter-
face will support iPod touch or iPhone devi-
ces from the 5th generation or newer with
the lightning connector.
—Aselection of supported devices can be
found in the database for tested mobile de-
vices at www.audi.com/mp3.
Playing media
The following sources can be selected depending
on the vehicle equipment:
— Amazon Alexa > page 202.
— USB device = page 202.
— External device: you can connect external devi-
ces via Bluetooth and use the Bluetooth audio
player > page 201, or you can connect an exter-
nal device directly to the Audi music interface
=> page 202.
Accessing media
Playing media files using the MMI
> Applies to: MMI: Select on the home screen:
MEDIA > Source > a source. Depending on the
connected device, the symbol for a source may
change. The device name may be displayed (for
example: myPhone).
> Select a track from the categories in the media
center > page 204.
Playing media files using the multifunction
steering wheel
Requirement: a media source must contain me-
dia files > page 203.
> Select the radio/media tab in the instrument
cluster.
> Turn the left thumbwheel to display the play-
list.
> To switch to a different source, press the [=]
button.
> To select a media file or a source, turn and
press the left thumbwheel.
203

Audi smartphone interface

Audi smartphone
interface
Setup
Applies to: vehicles with Audi smartphone interface
You can connect your smartphone to the MMI
with a cable or wirelessly* using the Audi smart-
phone interface. Certain content on your smart-
phone is adapted in the MMI while driving and
can be operated through the MMI.
Requirement: the vehicle must be stationary and
the ignition must be switched on. iPhone genera-
tion 5 or higher with Lightning connector and iOS
7.1.2 operating system or higher, or smartphone
with Android Auto app and Android 5.0 Lollipop
operating system or higher.
> Applies to: MMI: Select on the home screen:
SETTINGS > Connected devices > Audi smart-
phone interface > New connection.
> Connect your smartphone to the Audi music in-
terface > page 202 using a USB adapter
=> page 202, fig. 150, or
> To connect your iPhone wireless*, switch on the
Bluetooth function and Wi-Fi on your iPhone.
Open the Apple CarPlay settings in your iPhone.
In the MMI, press on your iPhone in the list of
displayed devices.
> To update the list, press O.
> Follow the system instructions.
> Pay attention to any additional system prompts
on your smartphone, if applicable.
> Applies to: MMI: If you declined use of Apple
CarPlay or Android Auto the first time you con-
nected your smartphone, then select on the
home screen: SETTINGS > Connected devices >
Audi smartphone interface > a smartphone.
> Follow the system instructions.

Z\ WARNING
Driving requires your complete and undivided
attention. As the driver, you have complete re-
sponsibility for safety in traffic. Never operate
mobile devices while driving, because this in-
creases the risk of an accident.

210
@) Note
Read the information about Audi connect, and
be sure to note the connectivity costs section
=> page 173.
@) Tips
— The functions that can be used depend on
the following factors, among others:
— The brand of your smartphone
— The version of the operating system in
your smartphone
— The software version of the app used
— The USB adapter cable and correct connec-
tion
— Your cell phone service provider
— The customized settings on your smart-
phone
— One of the factors above or a combination
of any of them could cause your smart-
phone to be incompatible with the Audi
smartphone interface. Compatibility cannot
be guaranteed for all types of smartphones.
For more information and assistance, refer
to the user guide and the manufacturer of
your smartphone.
— Please note that you can only connect your
smartphone via the front Audi music inter-
face in order to use the Audi smartphone in-
terface.
— Wireless Apple CarPlay* is not available in
all countries.
— Wireless Apple CarPlay* was a planned func-
tion at the time this manual was printed.
Wireless Apple CarPlay* is not available in
your vehicle.
— Wireless Apple CarPlay* is only possible in
vehicles without a navigation system or
without a detected vehicle position (GPS da-
ta) if the following requirement is met: the
embedded SIM card for the vehicle must be
logged into the mobile phone network
=> page 173.
— If the connected smartphone has voice con-
trol, you can operate your smartphone using
the external voice recognition system
=> page 27.

8W1012721BC
Checking and Filling

continue fueling, or else the expansion space in
the tank will be filled with fuel.
> After the fuel pump has switched off, wait five
seconds before removing the nozzle to allow
the rest of the fuel to finish dripping into the
fuel tank.
> Turn the fuel cap clockwise until it clicks into
place.
> 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
=> page 217.
For the tank capacity in your vehicle, refer to the
Technical Data > page 287.
To reduce the risk of fuel leaking out or vapors
escaping, make sure that the fuel tank is closed
correctly. Otherwise the Ey indicator light will
turn on.


ZX WARNING
Improper fueling procedures and improper
handling of fuel can lead to explosions, fires,
severe burns, and other injuries.
— Do not smoke. Keep away from open flames.
— The ignition must be switched off when re-
fueling.
— Mobile devices, radio devices, and other ra-
dio 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 you
must enter the vehicle, 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.


ZA\ WARNING
Audi does not recommend transporting fuel
containers inside 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, note the following:
— Always place the fuel container on the
ground before filling. Never fill the fuel
container with fuel while it is inside or on
the vehicle. Electrostatic discharge can oc-
cur while refueling and the fuel vapors
could ignite.
— When using fuel containers made of met-
al, the fuel pump nozzle must always re-
main in contact with the container to re-
duce the risk of static charge.
— Insert the fuel pump nozzle as far as pos-
sible into the filler opening while refuel-
ing.
— Follow the applicable legal regulations in
the country where you are driving when
using, storing and transporting fuel con-
tainers.
— Make sure that the fuel container meets
the industry standards, for example ANSI

or ASTM F852-86.



1) Depending on the engine and country
C) 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 may enter the exhaust
system and increase the risk of damage to
the catalytic converter.
@) For the sake of the environment
— Do not overfill the fuel tank, or fuel could
leak out when the vehicle is warming up.
— Fuel should never enter the sewer system or
come into contact with the ground.
219
>

Checking and Filling

@ 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.
Fuel filler door emergency release
Applies to: vehicles with manual fuel filler door release

If the central locking system malfunctions, the
fuel filler door can be unlocked manually.

Fig. 155 Right side trim panel in the luggage compart-
ment: opening the trim panel

Fig. 156 Luggage compartment: fuel filler door emergency
release
The emergency opening mechanism is located
behind the right side trim panel in the luggage
compartment.
> Open the cover in the side panel > fig. 155.
> To unlock the fuel filler door, loosen the red
loop from the retainer and then pull on the
loop carefully > fig. 1569©.
> Press on the left side of the fuel filler door to
open it > page 218, fig. 153.
@) Note
Only pull on the loop until you feel resistance.
You will not hear it release. If you continue to
220

pull, you could damage the emergency re-
lease mechanism.
Emissions control
system
General information
Z\ 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 your vehicle over flammable
materials such as grass or leaves because
the high temperature of the emissions sys-
tem could start a fire.
— Do not apply underbody protectant in the
exhaust system area, because this increases
the risk of fire.
(er) 1 id (Rel Uae lg
Observe the safety precautions > page 220, Gen-
eral information.


The vehicle may only be driven with unleaded
gasoline, or the catalytic converter will be de-
stroyed.
Never drive until the tank is completely empty.
The irregular supply of fuel that results from that
can cause engine misfires. Uncombusted fuel
could enter the exhaust system, which could
cause overheating and damage to the catalytic
converter.
Malfunction Indicator Lamp (MIL)
If the S indicator light blinks or turns on, there
is a malfunction that is causing poor emissions
quality and that could damage the catalytic con-
verter. Drive slowly to an authorized Audi dealer
or authorized Audi Service Facility to have the
malfunction corrected.

8W1012721BC
Checking and Filling

The indicator light can also turn on if the fuel fill-
er cap is not closed correctly > page 218),
Engine compartment
General information
Special care is required if you are working in the
engine compartment
For work in the engine compartment, such as
checking and filling fluids, there is a risk of in-
jury, scalding, accidents, and burns. For this
reason, follow all the warnings and general
safety precautions provided in the following in-
formation. The engine compartment is a dan-
gerous area in the vehicle. > A.
Explanation of warnings (sticker in the engine
compartment):

Hot engine components!
@ Rotating parts!


The radiator fan can switch on at any
[2 time!

High voltage! Switch off the engine be-
5 fore coming into contact with any igni-
tion system components!



The catalytic converter can be damaged
"71 if the oil level is too high!

Always follow the instructions in the op-
Co erating manual.

ZA WARNING
— Turn the engine off.
— Switch the ignition off.
— Set the parking brake.
— Select the “P” (Park) selector lever position.
— Allow the engine to cool.
— Keep children away from the engine com-
partment.
— Never spill fluids on a hot engine. These flu-
ids (such as the freeze protection contained
in the coolant) can catch fire.
— Avoid short circuits in the electrical system.
— Never reach into the radiator fan. The fan is

temperature-controlled and can turn on
suddenly, even when the ignition is switched
off.
— 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.
— The cap on the coolant expansion tank must
never be opened when the coolant is hot.
The cooling system is under pressure. There
is a risk of burns
—To protect your face, hands, and arms from
hot steam or coolant, cover the cap with a
thick cloth when opening.
— Do not remove the engine cover under any
circumstances. This increases the risk of
burns.
— Due to the risk of electric shock, never touch
the ignition cable or other components in
the electronic high-voltage ignition system
when the engine is running or is starting.
— If a gear is engaged while the vehicle is sta-
tionary and the engine is running, do not
press the accelerator pedal inadvertently.
Pressing the accelerator pedal will cause the
vehicle to move, and this could result in an
accident.
— If inspections or repairs must be performed
while the engine is running, moving compo-
nents (such as the ribbed belt, generator,
and radiator fan) pose an additional risk.
— Set the parking brake first and select the
“P” (Park) selector lever position.
— Always make sure that no parts of the
body, jewelry, ties, loose clothing, and
long hair can be caught in moving engine
components. Before any work, always re-
move any jewelry and/or ties, tie back long
hair, and make sure all clothing fits close
to the body to reduce the risk of anything
becoming caught in engine components.
— Pay attention to the following warnings list-
ed when work on the fuel system or on the
electrical equipment is required.
— Do not smoke.


1) Depending on the engine and country
221

Checking and Filling


— Never work near open flames.
— Always have a working fire extinguisher
nearby.
— 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.
— Limit your exposure to exhaust and chemi-
cals to as short a time as possible.

Z\ WARNING
California Proposition 65 Warning:
— Engine exhaust, some of its constituents,
and certain vehicle components contain or
emit chemicals known to the State of Cali-
fornia to cause cancer and birth defects and
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
reproductive harm.
— Battery posts, terminals and related acces-
sories contain lead and lead compounds,
chemicals known to the State of California
to cause cancer and reproductive harms.
Wash hands after handling.



O Note
When filling fluids, be sure not to add any flu-
ids to the wrong reservoirs. Otherwise severe
malfunctions and engine damage will occur.
@ For the sake of the environment
You should regularly check the ground under
your vehicle in order to detect leaks quickly. If
there are visible spots from oil or other fluids,
bring your vehicle to an authorized Audi deal-
er or authorized Audi Service Facility to be
checked.

D_ The & symbol is not available in all countries.
222

Opening and closing the hood
The hood is released from inside the vehicle.

Fig. 158 Unlocked hood: lever
Make sure the wiper arms are not raised up from
the windshield. Otherwise the paint could be
damaged.
Opening the hood
> With the door open, pull the lever >) below
the instrument panel in the direction of the ar-
row > fig. 157.
>» Raise the hood slightly > page 221.
> Press the lever > fig. 158 in the direction of the
arrow. This releases the hooks.
> Open the hood.
Closing the hood
> Push the hood down until you override the
force of the struts.
> Let the hood fall lightly into the latch. Do not
press itin. > AX.
Messages
B Warning! Hood is not locked. Stop vehicle
and check the lock