2018 AUDI A4 engine

Checking and Filling
.,. Push the release button again and remove the
cap comp lete ly .
.,. Make sure that the fluid level rema ins stable.
Add more coolant if necessary .
.,. Turn the cap to the right to secure it until you
feel resistance a second t ime.
Coolant loss usually indicates there is a leak . Im ­
mediately drive your vehicle to an authorized
Audi dealer or authorized Audi Serv ice Facility
and have the cooling system inspected . If the
coo ling system is not leaking, a loss can come
from the coolant boiling through overheating
and being pushed out of the cool ing system.
_& WARNING
- T he coo ling system is under pressure. Do
not open the coolant expansion tank cap
when the engine is hot. This increases the
risk of burns.
- The coo lant add itive and the coolant can be
dangerous to your healt h. For this reason,
keep the coolant in the origina l container
and away from children. There is a risk of poison ing.
- When working in the engine compartment, remember that the radiator fan can switch
on even if the ign ition is switc hed off, which
increases the risk of in jury.
(D Note
Do not add coolant if the expansion tank is
empty. There may be air in the cooling sys­
tem, wh ic h increases the risk of engine dam­
age.
If th is is the case, do not continue dr iv­
ing . See an a uthorized Aud i dea le r or author­
ized Aud i Service Fa cil ity fo r assistance.
330
Brake fluid
Fig. 271 En gine compa rtment: cap o n brake fluid reservo ir
Observe the safety precautions¢.&, in Working
in the engine compartment on page 32 3 .
Check ing the brake fluid level
.,. Read the brake fluid level on the brake fluid
reservoir ¢ page 325, fig . 268 . The brake flu id
level must be between the MI N and MAX ma rk­
ings ¢.&, .
The brake f lu id level is monito red automatically.
Changing the brake fluid
Have the brake fluid changed regularly by an au­
thorized Audi dea ler or authorized Audi Service
Facility.
_& WARNING -
- If the brake flu id leve l is below the MIN
marking, it ca n impair the brak ing effect
and driving safety, wh ich increase the r isk of
an accident. Do not continue dr iv ing . See an
author ized Audi dealer or au thori zed Audi
Serv ice Facility fo r ass ist ance.
- I f the brake fl uid is old, b ubbles may form
in the bra ke system dur ing heavy bra king.
This wo uld im pair b raking per formance and
driving safety, which increases the risk of an
accident.
- To ensure the brake system functions cor­
rectly, only use bra ke fluids tha t comp ly
wit h VW standard 50 1 14 or
FMVSS- 116 DOT 4 .
(D Note
-If the bra ke f lu id leve l is ab ove the MAX
marking, bra ke fluid may le ak o ut over the

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edge of the reservoir and result in damage
to the vehicle .
- Do not get any brake fluid on the vehicle
paint, beca use it will corrode the paint .
Battery
General warnings about batteries
Because of the complex power supply, all work
on batteries such as disconnecting, replacing,
etc. shou ld
onl y be performed by an a uthorized
Aud i dealer o r autho rized Aud i Serv ice Facility
¢ ,&. .
The term "vehicle battery" refers to the 12 Volt
battery in your veh icle.
Detailed warning s for th e vehicl e batter y:
®
Wear eye protection .
A
Battery acid is highly corrosive. Wear pro-
tective gloves and eye protect ion.
@
Fire, spa rks, open flame and smoking are
forbidden.
~
A highly explosive mixture of gases can
form when charging batteries.
®
Keep children away from battery acid and
batteries.
A WARNING
All work on the battery or electrical system in
your vehicle can result in injuries, chemical
burns, accide nts o r burns. Be cause of this, a ll
work m ust be perfo rmed
only by an a uthor­
ized Aud i deale r or a utho rized Aud i Serv ice
Facility.
_&. WARNING
California Proposition 65 Warning:
- Battery posts , termina ls and re lated acces­
sories contain lead and lead compounds,
chemicals known to the State of California
to cause cancer and reproductive problems.
Wash hands after handling.
Ch eck ing and Filling
(D Note
Protect the vehicle battery against freezing if
the veh icle w ill be parked for long periods of
time so that it is not destroyed by "free zing"
¢ page 332.
@ For the sa ke of the environment
i Batteries contain polluting substances such
as sulfur ic acid and lead. Contact an author­
i zed Audi dealer or authorized Audi Service
Fac ility for more informat ion .
Vehicle battery
The term "vehicle ba ttery" refers to the 12 Vol t
ba ttery in your vehicle.
Not running th e vehicle fo r long p eriod s of
time
If you do not drive your vehicle for severa l days or
weeks, electrical equ ipment is gradually scaled
back or sw itched off . Th is reduces energy use and
ensures the vehicle will be able to start after long
per iods of t ime
¢ page 151. Some convenie nce
funct ions, such as inte rio r ligh ting or power seat
adjustment, may not be ava ilable under certain
c ircumstances. These convenience functions will
be available again once you switch the ignition on
and start the engine.
Even when elect rical equipment is switched off,
the eq uipment can sti ll drain the vehicle battery
if the vehicle is not driven for long periods of
time. Deep draining results in a chemica l reaction
that destroys the inside of the vehicle battery .
The veh icle battery must be charged every month
to reduce the risk of this happening
¢ page 332 .
Contact an authorized Aud i dealer or authorized
Audi Service Facility for more information .
Winter operation
Co ld weather places higher demands on the vehi­
cle battery. Th is results in reduced starting ab ili­
ty. Have the vehicle battery checked by an au­
thorized Audi dea ler or authorized Audi Service
Facil ity before the cold time of year.
33 1

Checking and Filling
Charging the vehicle battery
Fig. 272 Engine co mpa rtment : connec tors for a c harger
and jump start cab le s
Req uirement: only use chargers with a m aximum
c hargi ng vo lta ge of 30 amp s/14.8 Volt s.
The
vehicle battery cables remain connected .
.,. Read the warnings c> .&. in General warnings
about batteries on page 331
and c> ,&. .
.,. Switch off the ignition and all electrical equip ­
ment .
.,. Open the hood 9 page 324 .
.,. Open the red cover on the positive terminal
c>fig. 272 .
.,. Clamp the charger terminal clamps to the jump
s ta rt pin s
according to the instruct ions . (pin
under the red cover = "positive ", p in with hex­
agonal head= "negative ") .
.,. Inse rt the powe r cable for the charg ing device
i nto the socke t and switch the dev ice on .
.,. At the end of the charging process , switch the
charger off and pull the power cab le out of the
socket .
.,. Remove the charger terminal clamps.
.,. Close the red cover on the positive terminal.
.,. Close the hood c> page 324 .
A WARNING
-A highly explosive mixtu re of gases can form
when cha rging batter ies. On ly charge the
vehicle batte ry in well-ven tilated areas.
- A drai ned vehicle battery can freeze at tem­
peratu res a round 32
QF (0 QC). A froze n or
thawed veh icle bat tery must not be charged
and must not be used anymore. The ba ttery
housing can crac k and battery acid can leak
o ut if ice forms, wh ich increases the r isk of
an exp losion and chemical burns. Contact an
332
author ized Audi dealer or authorized A udi
Service Facility for more information.
- Do not connect or disconnect the charging
cable whi le charging because this increases
the risk of an explos ion.
@ Tips
- Only charge the vehicle battery t hrough the
connect ions in the engine compartme nt.
- Read all of the manufacturer's instructions
for the charger before charging the vehicle
battery.
Windshield washer system
Fi g. 2 7 3 Engine compar tm ent: washer flui d res ervoir cap
The windshield washer fluid reservoir¢ contains
t he cleaning solution for the windshield and th e
headlight washer system *
c> page 325, fig. 268 .
The reservoir capaci ty can be found in
c> page 381.
To reduce the risk of lime scale deposits on the
spray no zzles, use clean water with low amounts
of calcium . Always add w indow 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 .
(D Note
-The concentration o f ant i-freez ing agent
must be adjusted to the ve hicle operat ing
conditions in the respective climate . A con­
cent ration t hat is too high can lead to vehi­
cl e damage.
- Never add radiator anti-freeze or other addi­
t ives to the washer fluid.

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-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.
Checking service intervals
You can check the remaining distance or time un­
til the next oil change or next inspection in the
Infotainment system .
.,. Select in the Infotainment system: the I MENU I
button >
Vehicle > left control button > Service
& checks > Service intervals.
Resetting the indicator
An authorized Audi dealer or authorized Audi
Service Facility will reset the service interval dis­
play after performing service.
If you have changed the oil yourself, you must re­
set the oil change interval.
.,. Select in the Infotainment system: the !MENUI
button >
Vehicle > left control button > Service
& checks > Service intervals > Reset oil change
interval.
If an oil change or inspection is due, you can ac­
cess it in the Infotainment system. The display
works in two stages:
-Service reminder: after a certain distance is
driven, a message appears in the instrument
cluster display every time the ignition is switch­
ed on. The remaining distance and time is dis­
played briefly.
- Service due: if your vehicle has reached a serv­
ice interval , a message appears briefly after
switching the ignition on.
(D 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
Checking and Filling
the mileage on the vehicle is low, do not ex­
ceed the time for the next service.
333

Wheels
Model/ Tire designation Tire pressure
Engine Normal load
Maximum load
(up to 3 people)
front rear front rear
PSI kPA PSI kPA
PSI kPA PSI kPA
225 /50 Rl 7 94H
30 210 28 190 32 220 32 220
A4 sedan: All Season
2 .0L 245
/40 R18 93Y
30 21 0 28 190 32 22 0 32 220
4-cylinder High Performance
( 190 hp )
245/40 R18 97H
35 240 32 220 35 240 35 240 Gasoline All season
engine 245/35 R19 93Y
35 240
32 220 36 250 39 270 High Performan ce
225 /50 Rl 7 94H
30 21 0 28 190 35 240 35 240
A4 sedan : All Season
2.0L 245/40 R18 93Y
30
210 28 190
33 230
33 230
4-cyl
inder High Performan
ce
( 252 hp )
245/40 R18 97H
3 5 240
32 220 36 250 36 250 Gasoline
All season
engine 245/35 R19 93Y
36 250 33 230 41 28 0 44 300 High Performance
225/50 Rl 7 94H
32 220 29 200 36 250 36 250 All Season
A4 sedan :
245 /40 R18 93Y
2 10 28 190 3 3 230 33 230
30 2.0L
High Performance
4 cylinders
245/40 R18 97H
32 220 36 250 36 250 Diesel en-35 240 All season
gine
245/35 R19 93Y
270 42
290
35 240
32 220 39
High Performan ce
S4 sedan: 245 /40 R18 97Y
3 6 2 50 33 230 3 8 260 3 8 260 3.0 liter High Performance
6-cyl inder
245/40 R18 97H
35 240
32 220
36 250
36 250 Gasoline
All season
engine 245/35 R19 93Y
39 270 35 24
0 44
300 45 3 10 High Performance
allroad: 225/55 R17 97Y
3
2 22 0 29 200 33 230 30 2 10
2 .0L High Performance
4 cylinder s 245/45 R18 96Y
32 220 29 200 35
240
32 220
Gasoline High Performan
ce
engine 245/45 R18 l00H
3 2 220 3 2 220 35 24 0 35 2 40 and
All Season
diesel en- 245/40 R19 98Y
35 240 32 220 38 260
35 2
4 0 gine
High Performance
346

Emergency assistance
Emergency assistance
General information
... Park the vehicle as far as possible from moving
traffic in the event of a breakdown. In the event
of a flat tir e, park the vehicle on a level surface .
It you are on a steep hill, be especially careful.
.,. Set the parking brake .
.,. Switch the emergency flashers on .
... Have the passengers exit the vehicle . They
should move to a safe place, for example be­
hind a guard rail.
_& WARNING
Follow the steps given above . This is for your
protection and the for the safety of other driv ­
ers.
Equipment
Vehicle tool kit/tire mobility kit/vehicle
jack
Applies to: vehicles with the vehicle tool kit, tire mobility kit
and veh icle jack
Applies to: sedan
Fig. 278 L uggage compartmen t: vehicle too l kit , ve hicle
j ack, tire mob ility kit an d comp resso r
Applies to: allroad
Fig. 279 Lug gage compa rtmen t: ve hicl e tool kit, v ehicle
j ack, tir e mobil ity k it and comp resso r
360
The vehicle tool kit, vehicle jack, tire mobility kit
and compressor are stored in the luggage com­
partment under the cargo floor cover.
Applies to: sedan
.,. Lift the cargo floor using the plastic handle and
hook the hand le onto the luggage compart­
ment
seal ~ fig. 2 78.
Applies to: allroad
... Remove the cargo floor cover ~ fig. 279 .
Applies to : vehicles with spare tire
... Remove the handle by turning it counter-clock ­
wise and remove the spare tire.
Appl ies to: sedan
.,. Unhook the cargo floor before closing the lug-
gage compartment lid .
Depend ing on vehicle equipment, the vehicle tool
kit, tire mobility kit and compressor may be lo­
cated under another cover that is secured w ith a
handwheel.
Applies to : allroad
On some vehicles, the vehicle tool kit is located
directly under the cargo floor
cover@~ fig. 2 79
behind the rear bench seat.
_& WARNING
Impr oper use of the vehicle jack can cause se­
rious personal injur ies.
- Never use the screw driver hex head to
tighten wheel bolts, since the bolts cannot
attain the necessary tightening torque if you
use the hex head, potentially causing an ac­
cident.
- The factory-supp lied jack is intended only
for your vehicle mode l. Under no circum­
stances should it be used to lift heavy
veh icles or other loads; you risk injuring
yourself.
- Never start the engine when the vehicle is
raised, which cou ld 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.

could slip and cause an injury if it does not
have sufficient hold on the vehicle.
- To reduce the risk of an accident, never start
the engine when the vehicle is raised.
- To reduce the risk of injury, support the ve­
hicle securely with suitable stands if work is
to be performed underneath the vehicle.
- To help prevent injury to yourself and your
passengers:
- Do not raise the vehicle until you are sure 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.
- Make sure jack position is correct, adjust as necessary and then continue to raise
the jack*.
- If work has to be done under the vehicle, ensure that it is safely supported on suita­
ble stands
-risk of injury!
- Never start the engine when the vehicle is on the jack*
-risk of accident!
(D Note
Do not lift the vehicle by the sill. Position the
vehicle jack* only at the designated mounting points on the side sill. Otherwise, your vehicle
will be damaged.
Removing and installing a wheel
Fig. 287 Wheel: inte rnal hex socket to turn the whee l
bolts
Emergency assistance
Fig. 288 Whee l: alignment pin in the top ho le
Removing a wheel
.,. Remove the top wheel bolt completely using
the hex socket in the screwdriver handle (in the
vehicle tool kit)
~fig. 287 and place it on a
clean surface.
.,. Install the alignment pin (from the vehicle tool
kit) by hand into the empty
hole ~ fig. 288.
.,. Remove the rest of the wheel bolts.
.,. Remove the wheel. The alignment p in remains
in the hole while doing this.
Install a wheel
Read the directions on~ page 366 when instal­
ling unidirectional tires.
.,. Slide the wheel on over the alignment pin .
.,. Install the wheel bolts and tighten gently using
th e hex socket.
.,. Remove the alignment pin and also tighten the
remai ning wheel bolt.
.,. Carefully lower the vehicle using the vehicle
jack*.
.,. Tighten the wheel bolts in a diagonal pattern
using the wheel wrench .
The wheel bolts must be clean and loosen/tight­
en easily. Check the contact surfaces for the
wheel and hub . Contaminants on these surfaces
must be removed before installing the wheel.
A WARNING
Never use the hex socket in the screwdriver
handle or the hex socket wrench with the
ratchet to loosen or tighten the wheel bolts.
This increases the risk of an accident, because
you will not reach the tightening specification
required .
~
365

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Fuse panel @ (brown)
No . Equipment
2
Mass airflow sensor, camshaft adjust-
ment, charge air cooler pump
3 Exhaust doors, fuel injectors, radiator inlet
4 Vacuum pump, hot water pump, particu-
late sensor, biodiesel sensor
5 Brake light sensor
6 Engine va lves, camshaft adjustment
7
Heated oxygen sensor, mass airflow sen-
sor
8
Water pump, high pressure pump, high
pressure regulator va lve
9 Hot water pump
10
Oil pressure sensor, oil temperature sen-
sor
11 Clutch pedal position sensor
12 Engine valves
13 Radiator fan
14 Fuel injectors
15 Ignition coils
16 Fuel pump
Fuse panel @ (red)
No . Equipment
1 Anti-theft alarm system
2 Eng ine control module
3 Lumbar support
Automatic transmission selector mecha -
4
nism
5 Horn
6 Electromechanical park ing brake
7 Gateway control module
8 Interior headliner lights
10 Airbag control module
11 Electronic Stabilization Control (ESC)
12 Diagnostic connector, light/rain sensor
13 Climate control system
14 Right front door control module
15 A/C compressor
Fuses and bulbs
Fuse panel © (black)
No . Equipment
1 Front seat heating
2 Windshield wipers
3 Left head light electronics
4
Panorama glass roof I sliding/t ilting sun-
roof
5 L eft front door control module
6 Sockets
7 Right rear door control module
8 All wheel drive
9 Right headlight electronics
10
Windshield washer system/headlight
washer system
11 Left rear door control module
Fuse panel @ (black)
No. Equipment
Seat ventilation, rearv iew mirror, climate
1 control system, rear climate control sys-
tern controls, windshield defogger
2 Gateway, climate control system
3 Sound actuator/exhaust sound tuning
4 Clutch pedal posit ion sensor
5 Engine start
7 Rear USB charg ing port
8 Homelink
9 Adaptive cruise contro l
11 Video camera
12 Matrix LED headlight/right LED headlight
13 Matrix LED headlight/left LED headlight
14 Rear window wipe r
Fuse panel © (red)
No . Equipment
1 Ignition coils
5 En gine mount
6 Automat ic transmission
7 Instrument panel
8 Climate control system (blower)
10 Dynamic steering
11 Engine start
371