2018 AUDI A4 maintenance

Wheels
the vehicle placard or tire inflation pressure la­
bel, you should determine the proper tire
inflation pressure for those tires).
As an added safety feature, your vehicle has been
equipped with a tire pressure monitoring system (TPMS) that illuminates a low tire pressure tell­
tale when one or more of your tires is significant­
ly under-inflated. Accordingly, when the low tire
pressure telltale illuminates, you should stop and
check your tires as soon as possible, and inflate
them to the proper pressure . Driving on a signifi­
cantly under-inflated tire causes the tire to over­
heat and can lead to tire failure. Under-inflation
also reduces fuel efficiency and tire tread life,
and may affect the vehicle's handling and stop­
ping ability.
Please note that the TPMS is not a substitute for
proper tire maintenance, and it is the driver's re­
sponsibility to maintain correct tire pressure,
even if under-inflation has not reached the level
to trigger illumination of the TPMS low tire pres­
sure telltale.
Your vehicle has also been equipped with a TPMS
malfunction indicator to indicate when the sys­
tem is not operating properly. The TPMS mal­
function indicator is combined with the low tire
pressure telltale. When the system detects a
malfunction, the telltale will flash for approxi­
mately one minute and then remain continuously
illuminated . This sequence will continue upon
subsequent vehicle start-ups as long as the mal­
function exists .
When the malfunction indicator is illuminated,
the system may not be able to detect or signal low tire pressure as intended. TPMS malfunctions
may occur for a variety of reasons, including the
installation of replacement or alternate tires or
wheels on the vehicle that prevent the TPMS
from functioning properly. Always check the TPMS malfunction telltale after replacing one or
more tires or wheels on your vehicle to ensure
that the replacement or alternate tires and
wheels allow the TPMS to continue to function
properly .
352
· If the tire pressure monitoring indicator
appears
The tire pressure indicator in the instrument
cluster informs you if the tire pressure is too low
or if there is a system malfunction.
Using the ABS sensors, the tire pressure monitor­
ing system compares the tire tread circumfer­
ence and vibration characteristics of the individu­
al tires. If the pressure changes in one or more
tires, this is indicated in the instrument cluster
display with an indicator light
[I] and a message.
If only one tire is affected, the location of that
tire will be indicated.
The tire pressures must be stored in the Infotain­
ment system again each time the pressures
change (switching between partial and full load
pressure) or after changing or replacing a tire on
your vehicle
c:> page 353. The tire pressure moni­
toring system only monitors the tire pressure you
have stored . Refer to the tire pressure label for
the recommended tire pressure for your vehicle
c:> page 344, fig . 2 77.
Tire tread circumference and vibration character­
istics can change and cause a tire pressure warn­
ing if:
- the tire pressure in one or more tires is too low
- the tires have structural damage
- the tire was replaced or the tire pressure was
changed and it was not stored
c:> page 353
- tires that are only partially used are replaced
with new tires
Indicator lights
[I]-Loss of pressure in at least one tire c:> ,&..
Check the tires and replace or repair if necessary.
Check/correct the pressures of all four tires and
store the pressure again in the Infotainment sys­
tem
c:> page 353.
mm (Tire Pressure Monitoring System) Tire
pressure: malfunction! See owner's manual.
If
mm appears after switching the ignition on or
while driving and the
[I] indicator light in the in­
strument cluster blinks for approximately one minute and then stays on, there is system mal-
function. Try to store the correct tire pressures
IJJ,,,

a co .... N ,....
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3 co
Fuse panel © (brown)
4 Audi side assist
8 Smart module (tank)
11 12 Volt battery
12 Homelink
13 Rearview camera, peripheral cameras
14 Right tail lights
16 Right safety belt tensioner
Fuse panel © (red)
No . Equipment
2 Sound-amp
lifier
3 AdBlue heating
5 Trailer hitch (right light)
7 Trailer h
itch
8 Trailer hitch (left light)
9 Trailer h itch (socket)
10 Sport differential
11 AdBlue heating
Bulbs
Replacing light bulbs
For your safety, we recommend that you have
your authorized Audi dealer replace any bulbs for
you.
It is becoming increasingly more and more diffi­
cult to replace vehicle light bulbs since in many
cases, other parts of the car must first be re­ moved before you are able to get to the bulb.
This applies especially to the light bulbs in the
front of your car which you can only reach
through the engine compartment.
Sheet metal and bulb holders can have sharp
edges that can cause serious cuts, parts must be
correctly taken apart and then properly put back
together to help prevent breakage of parts and
l ong term damage from water that can enter
housings that have not been properly resealed.
For your safety, we recommend that you have
your author ized Audi dealer replace any bulbs for
you, s ince your dealer has the proper tools, the
correct bulbs and the expert ise.
Fuses and bulbs
Gas discharge lamps (Xenon lights) :
Due to the high e lectr ical voltage, have the bulbs
replaced by a qualified technician. Headlights
with Xenon light are identified by the high volt­
age sticker .
LED headlights*
LED headlights require no maintenance. Please
contact your authorized Audi dealer if a bulb
needs to be replaced .
.&, WARNING
Changing Xenon lamps without the necessary
equipment can cause serious personal injury.
- Bulbs are pressurized and can explode when
be ing changed. Potential risk of injury!
- On veh icles equipped with gas discharge
bu lbs (Xenon light) life-threatening injuries
can resu lt from improper handling of the
h ig h-vo ltage portions of such lamps!
- Only your authorized Audi dealer or quali­
fied workshop should change the bulbs in
gas discharge lamps. There are parts with
sharp edges on the openings and on the
bulb holders that can cause serious cuts. If
you are uncertain about what to do, have the work performed by an authorized Audi
dealer or qualified workshop. Ser ious per­
sonal injury may result from improperly per­
formed work.
(D Tips
- If you st ill prefer to replace the light bulbs
yourself, be aware that the engine compart­ ment is a hazardous area to work
in¢ A in
Working in the engine compartment on
page 323.
- It is best to ask your authorized Audi dealer
whenever you want to change a bulb .
373

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Consumer Information
Warranty coverages
Y our Audi is co vered b y the following war ran­
tie s:
- New Vehicle Limited Warranty
- Limited Warranty Against Corrosion Perfora-
tion
- Emissions Control System Warranty
- Emissions Performance Warranty
- California Emissions Control Warranty (USA
vehicles only)
- California Emissions Performance Warranty
(USA vehicles only)
Detailed information regard ing your warranties
can be found in yo ur
W arranty & M ainten ance
bookl et.
Operating your vehicle
outside the U.S.A. or
Canada
Government reg ulations in the Un ited States and
Canada require that automobiles meet specific
emission regulations and safety standards.
Therefore, vehicles built for the U .S.A. and Cana­
da d iffer from vehicles sold in other countries.
I f you p lan to take your vehicle outside the conti­
nenta l limits of the United States or Canada,
there is the poss ibility that:
- u nleaded fue ls for vehicles with cata lytic con­
verter may not be available;
- fuel may have a considerably lower octane rat­
i ng . Imprope r fuel may ca use engine damage;
- service may be inadequate due to lack of p roper
service facilities, tools or testing eq uipment;
- r eplacement parts may not be readily ava ilable.
- Navigat ion systems for veh icles built for the
U .S .A . and Canada will not necessa rily work in
Eur ope, and may not wo rk in other countries
o utside of North Amer ica.
Consumer Inf ormation
(D Note
Audi cannot be respons ible for mechanical
damage that could resu lt from inadequate
fuel, service or parts ava ilability.
Audi Service Repair
Manuals and Literature
Audi Official Factory Service Manuals and L itera ­
ture are published as soon as poss ible after mod­
el i ntroduction. Service Ma nua ls and literature
are avai lab le to order from the Audi Tec hni cal Lit ­
erature Orde ring Center at :
www.audi.t e chlit eratur e.com
Maintenance
General
Your vehicle has been designed to he lp keep
maintenance requirements to a min imum. How­
ever, a certain amount of regular maintenance is
still necessary to assure your veh icle's safety,
economy and reliab ility . For detailed vehicle
maintenance consult your Wa rranty
& Mainte­
nance boo klet .
Und er diff icult op erating condition s, for exam­
ple at extremely low outside temperatures, in
very dusty regions, when towing a trai le r very fre­
quently, etc., some se rvice work shou ld be pe r­
fo rmed between the in terv als specified. This ap ­
plies particularly to:
- oil changes , and
- cleaning or replac ing the a ir filter .
(® For the sake of the environment
By regularly maintain ing your vehicle, you
help make sure that emiss ion standards are
maintai ned, thus min imizing adverse effects
on the environment .
Important considerations for you and your
vehicle
The increasing use of electronics, sophisticated
fuel injection and emission control systems, and
the genera lly increas ing techn ica l complexity of
""'
383

Consumer Info rmation
today's a utomo biles, have steadily reduced the
scope of maintenance and repairs which can be
carried out by veh icle owners.
Also , sa fet y and
en vironmental
concerns place very strict limits
on the nature of repairs and adjustmen ts to en­
g ine and transmission parts wh ich an owner can
perform .
Maintenance, adjustments and repairs usually re­
qu ire special tools, testing devices and other
equ ipment available to specially trained work ­
shop personnel in order to assure proper per­
forma nce, re liability and safety of the veh icle and
its many systems .
Improper maintenance, adjustments and repairs
can impair the operation and reliab ility of your
ve hicle and eve n void your vehicle warranty .
Therefo re, proof of se rvicing in a ccordance w ith
the m aintenance sched ule may be a condition for
up ho ld ing a possible wa rranty claim made within
the wa rranty pe riod.
Above all , ope rational safety can be adversely af­
fected, cre ating unne cessa ry risks fo r you and
your passengers.
I f in doubt about any servicing, have it done by
your author ized Audi dealer or any other properly
eq uipped and qualified workshop . We strongly
urge you to g ive your author ized Audi dealer the
opportunity to perform a ll scheduled mainte ­
nance and necessa ry repairs. Your dealer has the
facilities, origina l parts and tra ined specialists to
keep your veh icle runn ing prope rly.
Performing limited maintenance yourself
The fo llow ing pages describe a limited number of
procedures whic h can be performed on your vehi­
cle with ordinary tools, should the need arise and
tra ined personnel be unava ilable. Before per­
forming any of these procedures, always thor­
ough ly read all of the app licab le text and carefu l­
ly follow the instructions g iven . A lways rigorously
observe the
WARNINGS prov ided .
Befo re yo u check anything in the engine com ­
partment, always read and heed all WARNINGS
c::> & and c::> & in Working in the engine compart­
ment on page 323 .
384
A WARNING
-
-Ser ious personal in jury may occur as a result
of imp roperly performed maintenance, ad­
justments or repairs .
- Always be extreme ly careful when work ing
on the vehicle . Always follow commonly ac­
cepted safety practices and general com­ mon sense. Never r is k personal in jury.
- Do not attempt any of the mainte nance,
checks or repairs described on the following pages if you are no t fu lly fam iliar with these
or other proce dures with respect to the ve­
hicle, o r are uncert ain how to p ro ceed.
- Do not do any work wi thout the prope r tools
a nd equi pmen t. H ave the necess ary wo rk
done by your authorized Au di dealer or an ­
other properly equipped and qualified work­
shop.
- The engine compartment of any motor veh i­
cle is a potentially hazardous area . Never
reach into the a rea around or touch the radi­
ator fan. It is temperature controlled and
can switch on suddenly - even when the en­
gine is off and the ignition key has been re­
moved. The rad iator fan switches on auto­
mat ica lly when the coolant reaches a certain
temperature and will con tinue to ru n until
the coolant temperat ure drops.
- Always remove the igni tion key before any­
one gets u nder the vehicle.
- Always support your vehicle with safety
stands if it is necessary to work underneath
the vehicle. The ja ck* s upplied w ith the vehi­
cle is no t ad equate fo r thi s pu rpose and
could collapse causing se rious personal in ­
jury .
- If you must wor k underne ath the vehicle
with the wheels on t he ground, always make
sure the vehicle is on level ground, that the
wheels a re always sec urely blocked and that
the engine cannot be started.
- Always make sure the transmission se lector
lever (automatic t ransm iss ion) is in P (Park
position) and the park b rake is applied.

K
Key....... .. .. ................ ..... .. 38
Key not recognized . . . . . . . . . . . . . . . . . . .
85
Key replacement . . . . . . . . . . . . . . . . . . . . . 38
Mechanical key . . . . . . . . . . . . . . . . . . . .
38, 39
Replacing the battery . . . . . . . . . . . . . . . . . 39
Unlocking/locking . . . . . . . . . . . . . . . . . 40, 42
Vehicle code . . . . . . . . . . . . . . . . . . . . . . . . . 38
Kick-down (automatic transmission) . . . . . . .
95
Knee airbags . . . . . . . . . . . . . . . . . . . . . . . . . 287
Description . . . . . . . . . . . . . . . . . . . . . . . . . 287
How they work . . . . . . . . . . . . . . . . . . . . . . 288
Important safety instruct ions . . . . . . . . . . 289
L
Lane assist
refer to Audi active lane assist . . . . . . . . . 125
Lap timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Evaluating . . . . . . . . . . . . . . . . . . . . . . . . . 106
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
LATCH · · · · · . .... ............. .. .. .. . 309
Descr iption . . . . . . . . . . . . . . . . . . . . . . . . . 310
Install ing a child restraint ............ . 311
Location
· · . .. ..... ....... ... .. .. .. . 310
Mounting and releasing the anchorage
hook
. . .. .. .... ............. .. .. .. . 311
Launch control program . . . . . . . . . . . . . . . . . 95
Leather care/cleaning . . . . . . . . . . . . . . . . . 357
Left contro l button ............. .. .. .. .. 14
License agreement (MMI) . . . . . . . . . . . . . .
253
Lifting points (vehicle jack) ....... ..... . 364
Light/rain sensor
Headlights . . . . . . . . . . . . . . . . . . . . . . . . . .
54
Interval mode (w ipers) . . . . . . . . . . . . . . . . 60
Light functions . . . . . . . . . . . . . . . . . . . . . . . . 54
High beam assistant
55
Instrument illum ination . . . . . . . . . . . . . . . 58
Interior lighting . . . . . . . . . . . . . . . . . . . . . . 57
Lighting
Exterior
· · · · · · · · · · · · · · · · · · · · · · . .. .. .. 54
Interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 7
Lights
~ Headlight range control system . . . . . . . . . 54
;::; Listening to mus ic ,....
8 refer to Media .. ............. .. . 227 , 236
3 Loading the luggage compartment . . . . . . . 259
Index
Locking/unlocking
By remote control . . . . . . . . . . . . . . . . . . . . 40
With the centra l locking switch . . . . . . . . .
41
With the convenience key . . . . . . . . . . . . . . 40
With the lock cylinder . . . . . . . . . . . . . . . . .
42
Low beam headlights . . . . . . . . . . . . . . . . . . . 54
Luggage compartment . . . . . . . . . . . . . . . . . . 70
Cover..... .. .. .. .. ............. .. .. . 70
Pass-through . . . . . . . . . . . . . . . . . . . . . . . . 73
Socket.. .. .. .. . ............ .... .. .. . 68
Storing cargo correctly . . . . . . . . . . . . . . . 259
Tie-downs . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Val et parking function . . . . . . . . . . . . . . . . . 51
also refer to Loading the luggage compart-
ment ..... .. .. .. ................. ..
259
Luggage compartment lid . . . . . . . . . . . . . . . 43
Emergency release . . . . . . . . . . . . . . . . . . . . 47
Lumbar support . . . . . . . . . . . . . . . . . . . . . . . 65
M
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 383
Maintenanc e intervals . . . . . . . . . . . . . . . . . 333
Making an emergency call . . . . . . . . . . . . . . 180
Malfunc tion indicator lamp (MIL) . . . . . . . . . 24
Map
Display
219
Operating . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
Update . .. .. .. .. ............... .. ..
204
Mapupdate ... .. .. .................. . 217
Mechanical key . . . . . . . . . . . . . . . . . . . . . 38, 39
Media ... .. .. .. .. ............... 227, 236
Drives · · · · .. .. .. .. ....... ........ .. 228
Supported formats . . . . . . . . . . . . . . . . . . 242
Media center .. .. .. .. ............... .. 237
Memory buttons
refer to Shortcut keys . . . . . . . . . . . . 155, 162
Memory capa city
D. ,rectory . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Jukebox . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
Memory card SD card reader (MMI) . . . . . . . . . . . . . . . . .
228
Supported types/formats . . . . . . . . . . . . . 242
Memory function . . . . . . . . . . . . . . . . . . . . . . 67
MENU button
· · · · · · · · · · · · ·........ ... 155
393