2021 AUDI A8 key battery
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4N0012721BF
Quick access
Anti-lock braking system (ABS)
=> page 130
Steering
=>page 127
Steering lock
=>page 127
All wheel drive
=>page 129
Suspension control
=>page 126
Air suspension
=> page 126
Engine speed limitation
>page 14
Tank system
=> page 270
Tank system/high-voltage system
=> page 270
Electrical system
> page 284
Engine oil level (MIN)
> page 278
Engine oil level (MAX)
=> page 278
Engine oil sensor
> page 278
Malfunction Indicator Lamp (MIL)
=> page 274,
Engine warm-up request
> page 278
Washer fluid level
=> page 287
Windshield wipers
=> page 68
High-voltage battery range
=> page 137
Parking systems
=> page 190
Park assist plus
=> page 202
Maneuver assist
=> page 208
Tire pressure
=> page 307
Tire pressure
=> page 307
Loose wheel warning
=> page 304
Bulb failure indicator
=> page 62
Adaptive light
=> page 62
Light/rain sensor
=> page 62, > page 68
Door lock
=> page 43
Battery in vehicle key
=> page 47
Night vision assist
=> page 161
Intersection assist
=> page 185
Side assist
=> page 183;
Exit warning
=> page 184
Rear cross-traffic assist
=>page 195
Adaptive cruise assist
=>page 175
Steering intervention request
=>page 170, > page 177
Lane departure warning
=> page 178
Distance warning
=>page 175
Audi pre sense
=> page 182
Emergency assist
=> page 186
Emergency call function
=> page 228
Page 12 of 362
Quick access
Other indicator lights
Rear safety belt
=> page 82
Start/Stop system
>page 117
>page 114
Low beam headlights
=> page 58
Parking lights
=> page 58
Turn signals
=> page 59, > page 61
Cruise control system
=> page 163
Cruise control system
=> page 163
Efficiency assist
> page 164
Efficiency assist
=> page 164
Efficiency assist
=> page 164
Efficiency assist
=> page 164
Efficiency assist
=> page 164
Adaptive cruise assist
=> page 167
Adaptive cruise assist
=> page 167
Adaptive cruise assist
=> page 167
Adaptive cruise assist
=> page 167
Adaptive cruise assist
=> page 167
10
Electric drive ready mode
Park assist plus
=> page 199
Lane departure warning
=>page 177
High beam headlights
=> page 59
High beam assistant
=>page 59
Laser
lights
=> page 60
Rear safety belt
=> page 82
Transmission
=> page 112
Start/Stop system
=> page 117
Convenience key
=> page 108
Electromechanical parking brake
=> page 122
Electromechanical parking brake
=> page 122
Electric drive ready mode
= page 114
Electric drive ready mode
=>page 114
Combustion engine
>page 115
Plug-in hybrid modes
=>page 114
Plug-in hybrid modes
=> page 114
Plug-in hybrid modes
>page 114
Steering
>page 127
Air suspension
=>page 126
High-voltage battery range
=> page 137
Parking systems
=> page 190
Park assist plus
=> page 202
Park assist plus
=> page 202
Page 49 of 362
4N0012721BF
Opening and closing
Unlocking and locking with the Audi connect
vehicle control service)’
Applies to: vehicles with Audi connect vehicle control
Requirement: Audi connect vehicle control serv-
ices must be set up > page 224, Audi connect ve-
hicle control services. The vehicle must be park-
ing and the ignition must be switched off.
ZA WARNING
Observe the safety precautions > page 41.
@) Tips
— Only use the vehicle key when you can see
the
vehicle.
— The vehicle can only be locked when the "P”
selector lever position is engaged.
— Do not use the vehicle key to lock and un-
lock when you are inside the vehicle. Other-
wise, you could trigger the anti-theft
alarm*. If this happens, press the @ unlock
button.
@) Tips
Applies to: vehicles with convenience key
— When unlocking or locking the vehicle, the
convenience key cannot be more than ap-
proximately 4 feet (1.5 m) away from the
door handle or luggage compartment.
— Unlocking with the convenience key (keyless
access) can be deactivated in the MMI sys-
tem > page 42.
—To prevent the vehicle battery from dis-
charging, the energy management gradual-
ly switches off convenience functions that
are not needed. You then may no longer be
able to unlock your vehicle with the sensors.
D In certain countries.
BS Tey ae-e am al a BC
Fig. 33 Vehicle key: removing the battery holder
LED in the vehicle key
The LED (@) indicates the vehicle key function.
> If you press a button briefly, the LED blinks
once.
> If you press and hold a button (convenience
opening/closing), the LED blinks several times.
>» If the LED does not blink, the vehicle key bat-
tery is drained. Replace the battery in the vehi-
cle key.
Replacing the vehicle key battery
> Remove the mechanical key > page 45 and in-
sert it at an angle into the opening > fig. 33.
> Push the mechanical key in the opening in the
direction of the arrow to operate the release
button on the inside @). To reduce the risk of
damage, do not try to pry off the cover.
> Remove the cover from the battery tray.
> Insert the new battery with the “+” symbol fac-
ing up.
> Close the battery tray with the cover.
> Insert the mechanical key.
Z\ WARNING
If batteries or coin cell batteries are swal-
lowed or enter the body in any other way, they
can cause serious or fatal injuries within a
short period of time. There is a risk of chemi-
cal burns.
— Keep vehicle keys and key fobs with batter-
ies out of the reach of children. >
47
Page 50 of 362
Opening and closing
— Keep new or used batteries away from chil-
dren.
— If the battery compartment on a vehicle key
does not close securely, stop using the key
and keep it away from children.
— Seek medical attention immediately if you
suspect that a battery was swallowed or has
entered the body in any other way.
@ For the sake of the environment
Discharged batteries must be disposed of us-
ing
methods that will not harm the environ-
ment. Do not dispose of them in household
trash.
@ Tips
Replacement batteries for the vehicle key
must meet the same specifications as the
original battery.
Luggage compartment
lid
General information
— After closing the luggage compartment lid,
make sure that it is latched. The luggage
compartment lid could open suddenly while
driving, which would increase the risk of an
accident.
— Never drive with the luggage compartment
lid ajar or open, because poisonous gases
from the surrounding area can enter the ve-
hicle interior and increase the risk of asphyx-
iation.
— If there is a luggage rack (such as a bicycle
rack) on the luggage compartment lid, the
luggage compartment lid may not open
completely under certain circumstances or it
could close by itself if open due to the extra
weight. Therefore, the open luggage com-
partment lid must be given additional sup-
port or the cargo must first be removed
from the luggage rack.
— Applies to vehicles with power-operated or
sensor-controlled luggage compartment lid:
Pay careful attention when closing the lug-
gage compartment lid. Otherwise, you could
cause serious injury to yourself or others de-
spite the pinch protection.
ZX WARNING
— Applies to vehicles with anti-theft alarm sys-
tem: When the vehicle is locked from the
outside, no one - especially children - should
remain in the vehicle, because the windows
can no longer open from the inside
= page 44. Locked doors make it more diffi-
cult for emergency workers to enter the ve-
hicle, which puts lives at risk.
— Always close and lock the luggage compart-
ment lid and the doors when the vehicle is
not in use. Otherwise someone such as a
child could enter the vehicle through the
luggage compartment and become locked
inside it. To reduce the risk of injury, do not
allow children to play in or around the vehi-
cle.
— To reduce the risk of injuries by pinching,
make sure that no one is in the operating
area of the luggage compartment lid, in-
cluding the hinge areas and the upper and
lower edge of the luggage compartment lid.
48
Gi) Tips
— When the vehicle is locked, the luggage
compartment lid can be unlocked separately
by pressing the 4s button twice on the vehi-
cle key. The luggage compartment lid locks
automatically when it is closed again.
— The ability to open the luggage compart-
ment lid using the handle can be deactivat-
ed or activated in the MMI > page 42.
— The luggage compartment can be opened
from the inside in an emergency
> page 51.
Page 52 of 362
Opening and closing
> Press the <3 button in the luggage compart-
ment lid. Or
» Applies to vehicles with convenience key: When
the ignition is switched off, press the s/f}
button in the luggage compartment lid. The ve-
hicle key must not be more than approximately
4 feet (1.5 m) away from the luggage compart-
ment and it must not be inside the vehicle. If
you press the f\* button, then the vehicle will
lock.
The automatic opening or closing will stop if:
— You press the
the luggage compartment lid again Or
— If something blocks the luggage compartment
lid or makes it difficult for the lid to move.
If you press the
the luggage compartment lid again, the luggage
compartment lid will open again.
Observe the safety precautions > page 48.
The luggage compartment lid can be operat-
ed manually if the vehicle battery is low. It is
necessary to use more force when doing this.
Move the lid slowly to reduce the amount of
force needed.
D_ The closing function applies to vehicles that also have au-
tomatic luggage compartment lid operation.
sO
Opening and closing the luggage
compartment lid with foot motion (kicking
movement)
Applies to: vehicles with sensor-controlled luggage compart-
ment lid
rm a s
S$ < G a
Fig. 36 Vehicle rear: foot motion (example)
The luggage compartment lid can be opened and
closed automatically )) > A\ in General informa-
tion on page 48.
Requirements: you must be carrying your conven-
ience key* with you. The ignition must be switch-
ed off. You must be standing at the center behind
the luggage compartment lid.
> Move your foot back and forth under the bump-
er one time > fig. 36. Do not touch the bumper.
Make sure you have firm footing. The luggage
compartment lid will open or close 1) once the
system detects the movement. The automatic
opening or closing will be canceled if you re-
peat one of the movements described.
Observe the safety precautions > page 48.
The luggage compartment lid will only open
or close 2) if you perform the movement as
described. This prevents the luggage com-
partment lid from opening or closing due to
similar movements )), such as when you walk
between the rear of the vehicle and your ga-
rage door. In some situations, the function
may be limited or temporarily unavailable.
This may happen if: >
Page 96 of 362
Storage and convenience
Storage and convenience
Power
sources
When the ignition is switched on, you may be
able to use multiple power sources for external
devices, depending on the vehicle equipment.
12 volt sockets
You can connect electrical accessories to the 12
volt sockets. The power usage from the sockets
must not exceed a total of 120 watts. Do not
connect multiple devices to the sockets in the ve-
hicle at the same time.
The 12 volt sockets are labeled with the 12V
symbol. They are located at the front and rear of
the center console and on the side trim panel in
the luggage compartment”.
USB ports
Applies to: vehicles with USB port
You can charge mobile devices using the USB
ports. The USB ports are labeled with the «> or
[4 symbol or CHARGE ONLY.
115 volt socket
Applies to: vehicles with 115 volt socket
The socket is located in the rear center console
and can be used for electrical devices > A\. The
power usage must not exceed 150 watts.
When you push the device connector all the way
into the socket, the child safety mechanism re-
leases and there is electric current.
—If the LED on the socket is green or flashes
slowly, then the socket is ready for use.
— Ifthe LED is red and flashes quickly, there is a
malfunction in the connected device or the
socket is too hot. The socket will switch off for
safety reasons. To reactivate the socket, remove
the device connector. Connect the device after
correcting the malfunction or reconnect after a
brief cool-down period.
hicle when braking or in the event of an acci-
dent.
— Incorrect usage can lead to serious injuries
or burns. To reduce the risk of injuries, never
leave children unattended in the vehicle
with the vehicle key.
ZA\ WARNING
Applies to: vehicles with 115 volt socket
—To reduce the risk of fatal injury, do not in-
sert any conductive objects, such as knitting
needles, into the contacts on the socket.
—To reduce the risk of fatal injury, do not spill
any fluids on the socket. Should any mois-
ture enter the socket, make sure that it has
dried out completely before using the socket
again.
— If devices or connectors that are heavy (such
as a power supply unit) are attached directly
to the socket, the holder can become dam-
aged, which increases the risk of injury.
— Using adapters and extension cables in-
creases the risk of injury because they over-
ride the safety devices for the socket.
—To reduce the risk of injury, remove the con-
nector of the connected device if the socket
has switched off due to a malfunction.
ZA\ WARNING
— To reduce the risk of fatal injury, store all
connected devices securely when driving so
that they do not move around inside the ve-
94
(!) Note
— Read the operating manuals for the con-
nected devices.
—To reduce the risk of damage to the vehicle
electrical system, never attempt to charge
the vehicle battery by connecting accesso-
ries that provide power to the power sour-
ces.
— Do not connect any device whose network
class (voltage) does not match the network
class designed for the socket.
— Disconnect the connectors from the power
sources carefully to reduce the risk of dam-
aging them.
@) Tips
Applies to: vehicles with 115 volt socket
— Devices that are not shielded or devices near
the rear window antenna can cause
Page 109 of 362
4N0012721BF
Driving
Driving
Starting the vehicle
pyr Told T ola (ela)
= i
Fig. 91 Center console: starting the engine
Requirement: the key must be in the vehicle.
Starting the engine
> Press and hold the brake pedal.
> Press the [START ENGINE STOP] button. The
engine will start.
Plug-in hybrid drive: the electric drive system is
switched on. The combustion engine only starts
when necessary. The power meter indicates if the
electric drive system is switched on > page 15.
Equipment that uses a lot of electricity is switch-
ed off temporarily when you start the engine. If
the engine does not start immediately, the start-
ing procedure stops automatically after a short
time. If this is the case, repeat the starting pro-
cedure after approximately 30 seconds.
Stopping the engine
> Bring the vehicle to a full stop.
> Press the [START ENGINE STOP] button. The
engine will switch off.
Plug-in-hybrid drive: the electric drive system and
the combustion engine are switched off.
Applies to: vehicles with steering lock: The steer-
ing is locked when you turn off the engine with
the selector lever in the “P” position and open
the driver's door. The steering lock helps prevent
vehicle theft.
Stopping the engine in an emergency
If necessary in an emergency, the engine can also
be stopped while driving using the emergency off
function*.
> Press the [START ENGINE STOP] button twice in
a row or press and hold it one time.
Switching on and off
If you would like to switch the ignition on or off
without starting the engine, follow these steps:
> Press the [START ENGINE STOP] button without
pressing the brake pedal.
Switching the ignition off automatically
To prevent the vehicle battery from draining, the
ignition and possibly the exterior lighting may
switch off automatically.
Requirements:
— Conventional drive system: the Start/Stop sys-
tem must have stopped the engine.
— Plug-in hybrid drive: you must have driven the
vehicle. The combustion engine must not be
running.
— You must have left the vehicle for longer than
30 seconds.
— The ignition must be switched on.
Among other indicators, the system detects that
you have left the vehicle based on the following
factors:
— The driver's door has been opened.
— The driver's safety belt has been unbuckled.
— The brake pedal is not being pressed.
The ignition will also be switched off after 30 mi-
nutes or if you lock the vehicle from the outside.
ZA WARNING
—To reduce the risk of asphyxiation, never al-
low the engine to run in confined spaces.
— Never turn off the engine before the vehicle
has come to a complete stop. Switching it
off before the vehicle has stopped may im-
pair the function of the brake booster and
power steering. You would then need to use
more force to steer and brake the vehicle.
The fact that you cannot steer and brake as [>
107
Page 110 of 362
Driving
usual may increase the risk of accidents and
serious injuries.
— Secure the vehicle against rolling before ex-
iting the vehicle > page 108.
@) Note
— Avoid high engine speed, full throttle, and
heavy engine load if the engine has not
reached operating temperature yet. You
could damage the engine.
— If the engine has been under heavy load for
an extended period of time, heat builds up
in the engine compartment after the engine
is switched off and there is a risk of damag-
ing the engine. For this reason, let the en-
gine run at idle for approximately two mi-
nutes before shutting it off.
@ Tips
— Brief noises are normal when starting and
stopping the vehicle and are no cause for
concern.
— For up to 10 minutes after stopping the en-
gine, the radiator fan may turn on again au-
tomatically or it may continue to run, even if
the ignition is switched off.
— It may not be possible to start the vehicle in
extremely low temperatures.
— Power will be fully available once the engine
is at operating temperature.
Messages
Hj Engine start system: malfunction! Please
contact Service
Do not switch the ignition off because you may
not be able to switch it on again. Drive to an au-
thorized Audi dealer or authorized Audi Service
Facility immediately to have the malfunction cor-
rected.
B Engine start system: malfunction! Please
contact Service
There is a malfunction in the engine start system.
Drive immediately to an authorized Audi dealer
or authorized Audi Service Facility to have the
malfunction repaired.
108
B Remote control key: key not detected. Is the
key still in the vehicle?
The vehicle key was removed from the vehicle
while the engine is running. If the vehicle key is
no longer in the vehicle, you cannot switch the ig-
nition on or start the engine once you stop it. You
also cannot lock the vehicle from the outside.
Remote control key: hold back of key
against the designated area. See owner's man-
ual
The battery in the vehicle key may be drained or
there may be a malfunction. To start the vehicle,
you must also hold the vehicle key against the lo-
cation shown ?) > page 107, fig. 91.
If the malfunction remains, drive immediately to
an authorized Audi dealer or authorized Audi
Service Facility to have the malfunction correct-
ed.
When driving
Starting to drive, stopping, and parking
Starting from a stop
> Press and hold the brake pedal.
> Start the engine.
> Select a gear.
> Release the parking brake.
> Release the brake pedal. The vehicle may roll.
> Press the accelerator pedal to accelerate.
Securing the vehicle against rolling
Secure your vehicle to prevent it from rolling be-
fore exiting the vehicle.
> Set the parking brake.
> Select the “P” selector lever position.
> If parking on a steep road, turn the steering
wheel so that your vehicle will roll against the
curb in case it should start to move.
If one of these measures is not possible, for ex-
ample because there is no vehicle power, you
must secure your vehicle against rolling using ad-
ditional measures.
> Only park the vehicle on a level surface.
> Use suitable objects to block the front and rear
wheels.