2021 AUDI A5 engine

Checking and Filling

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.

ZA WARNING
— The engine compartment in any vehicle is a
potentially dangerous area. Stop the engine,
switch the ignition off, and allow the engine
to cool before working in the engine com-
partment. Always follow the information
found in > page 230, General information.
— 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 continue driving if the coolant expan-
sion tank is empty. Do not add any coolant,
because air could enter the cooling system
and damage the engine. See an authorized
Audi dealer or authorized Audi Service Facility
for assistance.
238
Brake fluid

BFV-0229]


Fig. 170 Engine compartment: cap on brake fluid reservoir
Observe the safety precautions > page 230, Gen-
eral information.
Checking the brake fluid level
The brake fluid reservoir is located under a cover
on the driver’s side.
> Lift the cover > page 232, fig. 167 at both
openings and remove it.
>» Read the brake fluid level on the brake fluid res-
ervoir > page 232, fig. 167. The brake fluid lev-
el must be between the MIN and MAX markings
oA.
The brake fluid level is monitored automatically.
Messages
EG i @ Brakes: stop vehicle and check brake
fluid level
Stop the vehicle and check the brake fluid level.
See an authorized Audi dealer or authorized Audi
Service Facility for assistance.
Changing the brake fluid
Brake fluid should be changed at regular inter-
vals. Have the brake fluid changed by an author-
ized Audi dealer or authorized Audi Service Facili-
ty. The authorized Audi dealer or authorized Audi
Service Facility will inform you of the replace-
ment intervals.

ZA WARNING
— If the brake fluid level is below the MIN
marking, it can impair the braking effect and
driving safety, which increase the risk of an

8W7012721BB
Checking and Filling


accident. Do not continue driving. See an au-
thorized Audi dealer or authorized Audi
Service Facility for assistance.
— If the brake fluid is old, bubbles may form in
the brake system during heavy braking. This
could impair braking performance and driv-
ing safety, which increases the risk of an ac-
cident.
— The brake fluid in your vehicle must meet
the standard VW 501 14 and is available at
an authorized Audi dealer or authorized
Audi Service Facility. If this brake fluid is not
available, another high-grade brake fluid of
equivalent quality may be used, and it must
meet
the U.S. Federal Motor Vehicle Stand-
ard (FMVSS) 116 DOT 4, Class 6.

Switch off all electrical equipment that is not
needed. If necessary, some equipment will be
switched off automatically. Vehicle functions or
driving stability may be limited. Drive to an au-
thorized Audi dealer or authorized Audi Service
Facility immediately.
= Electrical system: low battery charge. Bat-
tery
will be charged while driving
The starting ability may be impaired.
If this message turns off after a little while, the
vehicle battery has charged enough while driving.
If this message does not turn off, drive immedi-
ately to an authorized Audi dealer or authorized
Audi Service Facility.

@) Note
— If the brake fluid level is above the MAX
marking, brake fluid may leak out over the
edge of the reservoir and result in damage
to the vehicle.
— Do not allow any brake fluid to come into
contact with the vehicle paint, because it
will corrode the paint.
Electrical system
If the = f B or = indicator light turns on,
there is a malfunction in the power supply, the
battery, or the vehicle electrical system.
= f B Electrical system: malfunction! Safely
stop vehicle
Do not continue driving and switch the ignition
off > A\. See an authorized Audi dealer or author-
ized Audi Service Facility for assistance.
= Electrical system: malfunction! Restart not
possible. Please contact Service
If you switch the ignition off, you will not be able
to restart the vehicle. Vehicle functions or driving
stability may be limited. Drive to an authorized
Audi dealer or authorized Audi Service Facility im-
mediately.
= Electrical system: malfunction! Please con-
tact Service
Z\ WARNING
When there is an electrical system malfunc-
tion, vehicle functions may not work and driv-
ing stability may be limited, which increases
the risk of an accident. Do not continue driv-
ing and switch the ignition off. See an author-
ized Audi dealer or authorized Audi Service Fa-
cility for assistance.


Battery
lala Meme cd)
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 240, 12
Volt vehicle battery or > page 241, Other bat-
tery types
— Auxiliary battery (for example, for recuperation
or optional equipment) > page 241, Other bat-
tery types
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
239
>

Checking and Filling

that the vehicle can still be started, the electrical
equipment will be limited or switched off. Some
convenience functions, such as interior lighting
or power seat adjustment, may not be available
under certain circumstances. The convenience
functions will be available again when you 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 241. Contact an authorized Audi dealer or
authorized Audi Service Facility for more infor-
mation.
Winter operation
Cold weather places an especially high load on
the 12 Volt vehicle battery. Have the battery
checked by an authorized Audi dealer or author-
ized Audi Service Facility before cold weather be-
gins.
so that it will not be destroyed by “freezing”
= page 241, Charging the 12 Volt vehicle
battery.
— There are electrical components under the
cargo floor behind a trim panel that warm
up during operation. To reduce the risk of
the components overheating, do not store
objects such as blankets under the cargo
floor. If the components overheat, they will
switch off temporarily. This will be indicated
by a message that will be displayed in the
instrument cluster until the temperature re-
turns to normal.
12 Volt vehicle battery
Explanation of warnings:
Always wear eye protection.

forbidden.

ZX 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 a charging cable or jump
start cable directly to the 12 Volt vehicle
battery. Only use the connections in the en-
gine compartment > page 241.

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 harms.
Wash hands after handling.

@) Note
— If the vehicle will be parked for long periods
of time, protect the battery against the cold
240
A highly explosive mixture of gases can
form when charging batteries.

Always keep children away from battery
acid and the battery.
Battery acid is highly corrosive. Always
wear protective gloves and eye protection.
® Fire, sparks, open flame, and smoking are

@/ | Always follow the instructions in the oper-
(Q | ating manual.

@) For the sake of the environment

% Lead-acid batteries must be disposed of
using methods that will not harm the environ-
ment. Do not dispose of them in household
trash. They contain harmful substances, such
as sulfuric acid and lead, and also recyclable
raw materials. Contact an authorized Audi
dealer or authorized Audi Service Facility for
more information.

8W7012721BB
Checking and Filling

Other battery types
Explanation of warnings:
Fire, sparks, open flame, and smoking are
& forbidden.
Always keep children away from battery
@) acid and the battery.


@/ | Always follow the instructions in the oper-
fQ | ating manual.

Z\ WARNING
All work on the batteries must only be per-
formed by an authorized Audi dealer or au-
thorized Audi Service Facility.
— Gases that escape from these different bat-
tery types can be poisonous or flammable.
— The contents of these battery types can be
corrosive. If any battery contents come into
contact with the skin, flush the affected
area for at least 15 minutes with clean wa-
ter. Then wash the affected area with soap.
Have the affected area examined by a medi-
cal professional.
@) Note
Components must not be connected to the
battery terminals and wires on these battery
types because this increases the risk of dam-
age, for example due to overvoltage.

@ For the sake of the environment

“5 J These types of batteries must be dis-
posed of using methods that will not harm
the environment. Do not dispose of them in
household trash. They contain harmful sub-
stances and recyclable raw materials. Contact
an authorized Audi dealer or authorized Audi
Service Facility for more information.
ing the 12 Volt vehicle battery

Fig. 171 Engine compartment: connectors for a charger or
jump start cables
Observe the safety precautions > page 230, Gen-
eral information, > /\ in Battery general infor-
mation on page 240 and > /A\.
Requirement: only use chargers with a maximum
charging current of 14.8 volts. The battery ca-
bles remain connected.
The charging cable connections are located in the
motor compartment. The ground point ©) is al-
ways located on the vehicle body.
>» Switch off the ignition and all electrical equip-
ment.
> Open the hood > page 231.
> Press the release lever on the positive terminal
and fold the cover upward > fig. 171.
> Clamp the charger terminal clamps to the jump
start pins according to the instructions. (Hex
head bolt under a cover (), ground point on the
vehicle body ©).
> Insert the power cable for the charging device
into the socket and switch the device on.
>» At the end of the charging process, switch the
charger off and pull the power cable out of the
socket.
> Remove the charging device terminal clamps.
> Close the cover on the positive terminal.
> Close the hood = page 231.

ZA WARNING
— Never connect a charging cable or jump
start cable directly to the 12 Volt vehicle
battery. Only use the connections in the en-
gine compartment > page 241. >

241

Checking and Filling


— A highly explosive mixture of gases can form
when charging batteries. Only charge the
battery in well-ventilated areas.
— A drained battery can freeze at tempera-
tures around 32 °F (0 °C). Do not charge or
use a frozen or thawed battery. If ice forms,
the battery housing can crack and battery
electrolyte can leak out, which increases the
risk of an explosion and chemical burns.
Contact an authorized Audi dealer or author-
ized Audi Service Facility for more informa-
tion.
— Do not connect or disconnect the charging
cable while charging because this increases

the risk of an explosion.

G) Tips
Read all of the manufacturer's instructions
for the charger before charging the battery.
Windshield washer
system

B8W-0125


Fig. 172 Engine compartment: washer fluid reservoir cap
Observe the safety precautions > page 230, Gen-
eral information.
The windshield washer reservoir © contains the
cleaning solution for the windshield/rear win-
dow* and the headlight washer system*
> fig. 172, > page 232. The reservoir capacity
can be found in > page 300.
To reduce the risk of lime scale deposits on the
spray nozzles, use clean water with low amounts
of calcium. Always add window cleaner to the wa-
ter. When the outside temperatures are cold, an
anti-freezing agent should be added to the water
so that it does not freeze.
242
Messages
gs Please add washer fluid
Fill the washer fluid for the windshield washer
system and the headlight washer system* when
the ignition is switched off.
C) Note
— The concentration of anti-freezing agent
must be adjusted to the vehicle operating
conditions and the climate. A concentration
that is too high can lead to vehicle damage.
— Never add radiator anti-freeze or other addi-
tives to the washer fluid.
— Do not use a glass cleaner that contains
paint solvents, because this could damage
the paint.
Service interval display
The service interval display detects when your ve-
hicle is due for service.
The service interval display works in two stages:
— Inspection or oil change reminder: after driv-
ing a certain distance, a message appears in the
instrument cluster display each time the igni-
tion is switched on or off. The remaining dis-
tance or time is displayed briefly.
— Inspection or oil change due: if your vehicle
has reached an inspection or oil change interval
or both intervals at the same time, the mes-
sage Inspection due! or Oil change due! or Oil
change and inspection due! appears briefly af-
ter switching the ignition on or off.
Checking service intervals
You can check the remaining distance or time un-
til the next oil change or next inspection in the
Infotainment system.
Applies to MMI: Select on the home screen: VE-
HICLE > Settings & Service > Service intervals.
Resetting the indicator
An authorized Audi dealer or authorized Audi
Service Facility will reset the service interval dis-
play after performing service.

8W7012721BB
Checking and Filling

If you have changed the oil yourself, you must re-
set the oil change interval.
Applies to: MMI: To reset the display, select on
the home screen: VEHICLE > Settings & Service
> Service intervals.
@) Note
— Only reset the oil change indicator if the oil
was changed.
— Following the service intervals is critical to
maintaining the service life and value of
your vehicle, especially the engine. Even if
the mileage on the vehicle is low, do not ex-
ceed the time for the next service.
243

Wheels

Ncw dee em -])
Please note that the information
contained in the following table
was correct at the time of print-
ing, and the information is sub-
ject to change. If there are any
differences, you should always
follow the tire pressure sticker
=> page 254, fig. 175.
Make sure that the tire designa-
tion on your tire matches the des-
ignation on the tire pressure label
and the tire pressure table.
The following table lists recom-
mended tire pressures in cold
tires according to the load and
the size of the tires installed.






















Model/ Tire designation Tire pressure
Engine Normal load Maximum load
(up to 2/3* people)»
Front Rear Front Rear
PSI | kPA | PSI | kPA | PSI | kPA | PSI | kPA
AS5 Coupe: 225/50 R17 94Y 32. | 220 | 29 | 200 | 35 | 240 | 35 | 240
2.0L 245/40 R18 93Y 32 | 220 | 29 | 200 | 35 | 240 | 35 | 240
4-cylinder 255/35 R19 96Y 32 | 220 | 32 | 220) 35 | 240 | 35 | 240
245/40 R18 97H 35 | 240 | 35 | 240 | 38 | 260 | 38 | 260
265/30 R20 94Y 33. | 230 | 33 | 230 | 36 | 250 | 36 | 250
S5 Coupe: 245/40 R18 97H 35 | 240 | 32 | 220 | 39 | 270 | 39 | 270
3.0L 245/40 R18 97Y 36 | 250 | 33 | 230) 41 | 280 | 41 | 280
G-cytinder 255/35 R19 96Y 38 | 260 | 35 | 240 | 42 | 290 | 42 | 290
265/30 R20 94Y 41 | 280 | 38 | 260 | 44 | 300 | 44 | 300
RS 5 Coupe: 265/35 R19 98Y 35/ | 240/ | 32/ | 220/ | 38/ | 260/| 38/ | 260/
2.9L 385) | 2605) | 355) | 240») | 415) | 2805) | 415) | 280)
6-cylinder 275/30 R20 97Y 36/ | 250/ | 33/ | 230/ | 39/ | 270/| 39/ | 270/
395) | 2705) | 355) | 2405) | 425) | 2904)| 425) | 2905)
A5 Cabriolet: [225/50 R17 94Y 32 | 220 | 29 | 200 | 35 | 240 | 38 | 260
2.0L 245/40 R18 93Y 32 | 220 | 29 | 200 | 35 | 240 | 38 | 260
cylinder 255/35 R19 96Y 35 | 240 | 32 | 220) 35 | 240 | 38 | 260
225/50 R17 94H 35 | 240 | 32 | 220 | 38 | 260| 41 | 280
245/40 R18 97H 35 | 240 | 32 | 220 | 38 | 260| 41 | 280
265/30 R20 94Y 35 | 240 | 32 | 220 | 38 | 260| 41 | 280
S5 Cabriolet: / 245/40 R18 97Y 38 | 260 | 35 | 240 | 41 | 280 | 41 | 280
3.0L 245/40 R18 97H 38 | 260 | 35 | 240 | 41 | 280) 41 | 280
6-cylinder 255/35 R19 96Y 39 | 270 | 36 | 250 | 42 | 290 42 | 290
265/30 R20 94Y 42 | 290 | 39 | 270) 46 | 320 | 46 | 320

256

8W7012721BB
Wheels













Model/ Tire designation Tire pressure
Engine Normal load Maximum load
(up to 2/3* people)?
Front Rear Front Rear
PSI | kPA | PSI | kPA | PSI | kPA | PSI | kPA
A5 Sportback: |225/50 R17 94Y 32 | 220 | 29 | 200) 35 | 240) 35 | 240
2.0L 245/40 R18 93Y 32 | 220 | 29 | 200 | 35 | 240) 35 | 240
4-cylinder 255/35R1996Y | 32 | 220 | 32 | 220 | 38 | 260| 41 | 280
245/40 R18 97H 35 | 240 | 35 | 240 | 38 | 260) 41 | 280
265/30 R20 94Y 33. | 230 | 33 | 230) 38 | 260) 38 | 260
S5 Sportback: | 245/40 R18 97H 35 | 240 | 32 | 220] 39 | 270) 39 | 270
3.0L 245/40 R18 97Y 36 | 250 | 33 | 230] 41 | 280) 41 | 280
Greylinder 255/35R1996Y | 38 | 260 | 35 | 240 | 42 | 290| 42 | 290
265/30 R20 94Y 41 | 280 | 38 | 260 | 45 | 310 | 45 | 310
RS 5 Sportback: | 265/35 R19 98Y 36/ | 250/ | 32/ | 220/ | 39/ | 270/| 39/ | 270/
2.9L 39) | 270») | 36) | 250) | 425) | 290)| 425) | 290)
6-cylinder 275/30 R20 97Y 38/ | 260/ | 32/ | 220/ | 41/ | 280/| 41/ | 280/
415) | 280) | 365) | 250) ) 44>) | 3005) | 44») | 3005)

4) Vehicles with four seating positions: two people in the front, Vehicles with five seat-
ing positions: two people in the front, one person in the rear
5) The value before the forward slash applies to vehicles with a maximum speed up to
155 mph (250 km/h); the value after the slash is for up to 174 mph (280 km/h).

Z\ WARNING
Please note the important safe-
ty precautions regarding tire
pressure > page 254 and load
limits > page 257.
Tires and vehicle load limits
There are limits to the amount of
load or weight that any vehicle
and any tire can carry. A vehicle
that is overloaded will not handle
well and is more difficult to stop.
Overloading can not only lead to
loss of vehicle control, but can al-

so damage important parts of the
vehicle and can lead to sudden
tire failure, including a blowout
and sudden deflation that can
cause the vehicle to crash.
Your safety and that of your pas-
sengers also depends on making
sure that load limits are not ex-
ceeded. Vehicle load includes ev-
erybody and everything in and on
the vehicle. These load limits are
technically referred to as the vehi-
cle’s Gross Vehicle Weight Rating
(“GVWR”).
257
>