2012 AUDI A3 sensor

204 Checking and filling
Checking the engine coolant level
The engine coolant level can be checked with
a quick glance .
Fig. 162 Engine compartme nt: coo lant expansio n tank
Before you check anything i n the eng ine com­
partment,
a lw ays rea d and h eed all WARN­
ING S ¢&. in Working in the engine compart­
ment on page 194.
.. Park your vehicle on a level surface.
.. Turn
off the ignit ion .
.. Read the eng ine coolant leve l from the
coolant expansion tank<=>
fig. 162 . With a
cold eng ine, the coo lant level should be be­
tween the "min" and "max" markings . When
the engine is warm, the level may be slightly above the "max" marking.
The location of the coolant expansion tank
can be seen in the engine compartment illus­
tration
i:> page 196.
To obtain an accurate read ing, the engine
must be switched
off.
The expansion tank in yo ur vehicle is equipped
with an e lectric coolant level sensor .
When the coolant level is too low, the warning light in the Auto -Check System
c> page 17 w ill
blink until you add coo lant and the level has
been restored to norma l. Even though there is
an electric coolant level sensor, we still rec­
ommend you check the coolant level from
time to time.
Coolant lo ss
Coolant loss may indicate a le ak in the cooling
system . In the event of coolant loss, the cool­
ing system should be inspected immediately by your authorized Audi dea
ler .
It is not
enough merely to add coolant .
In a
se aled system, losses can occur on ly if
the boiling point of the coo lant is exceeded as
a res ult of overheating.
(D Note
Do not ad d any type of radiator leak sea l­
ant to your veh icle's engine coolant . Add­
i ng radiator repair fl uid may adverse ly af ­
fect the funct ion and performance of your
cooling system and could result in damage not covered by your New Veh icle Limited
Warranty .
Adding coolant
Be very careful when adding engine coolant.
Before you check anything in the eng ine com ­
partment,
a lw ays re a d and heed all WARN­
INGS c::> A in Working in the engine compart ­
ment on page 194 .
.. Turn off the engine .
.. Let the engine cool down.
.. Place a thick rag over the coolant expansion
tank
c::> page 204, fig . 162 and ca refull y
twist the cap counter-clockwise c::> A.
.. Add coo lant .
.. Twist the cap on aga in
tightly .
Replacement engine coolant must conform to
exact spec ificat ions
c::> page 203, Coolant.
Even in an emergency, if coolant addi-
t ive G12++ . G 12+ or G12 is not ava ilable, do
n ot use a d iffe rent addit ive. Use plain water
instead unt il you can get the correct add itive
and can restore the correct ratio. This shou ld
be done as soon as possible .
If you have lost a considerab le amou nt of
c oolant, then you sho uld add cold ant ifree ze
and co ld wate r on ly when the engine is cold.
Always use
new engine coo lant when refilling .
Do not f ill coolant above the
"MAX" mark. Ex­
cess coolant will be forced out through the
pressure relief valve in the cap when the en -
gine becomes hot .
Iii>

remain continuously illuminated. This se­
quence will continue upon subsequent vehicle
start-ups as long as the malfunction exists.
When the malfunction indicator is illuminat­
ed, the system may not be able to detect or
signal low tire pressure as intended . TPMS
malfunct ions may occur for a variety of rea­
sons, including the installation of replace­
ment or alternate tires or wheels on the vehi­
cle that prevent the TPMS from functioning
properly . Always check the TPMS malfunction
tellta le after replacing one or more tires or
wheels on your vehicle to ensure that the re­
placement or alternate tires and wheels allow
the TPMS to continue to function properly.
Tire pressure indicator appears
Appl ies to vehicles: with tire pressur e monitoring sys te m
The tire pressure indicator in the instrument
cluster informs you if the tire pressure is too
low or if there is a system malfunction.
Fig. 172 Display : underinflation warning
Fig. 173 Display: System malfunction
Using the ABS sensors, the tire pressure moni ­
toring system compares the tire tread circum­
ference and vibration characteristics of the in­
dividual tires. If the pressure decreases in one
or more tires, this is indicated in the instru­
ment cluster with a warning symbol
ti] and a
Tires and wheels 231
message r=!) fig. 172. The driver message in the
display goes out after 5 seconds. The driver
message can be displayed again by pressing
the
ICHECKI button @¢ page 10, fig . 3 . If on­
ly one tire is affected, the display will indicate
its position .
The tire pressure monitoring must be reset in
the menu display each time the pressures are
adjusted (e .g. when switching between parti­
al and full load pressure) or after changing or
replacing a tire on your vehicle¢
page 232.
You can find the recommended tire pressures
for your vehicle on the label on the driver's
door pillar¢
page 216.
Tire tread circumference and vibration charac­
teristics can change and cause a tire pressure
warning if:
- the tire pressure in one or more tires is too
low,
- the tire has structural damage,
- the tire pressure was changed, wheels rotat- ed or replaced but the TPMS was not reset
¢page 232.
Warning symbols
ti] Loss of pressure in at least one tire¢&.
Check the tire or tires and replace or repair if
necessary. The indicator light
ti] in the instru­
ment cluster also illuminates
¢page 13.
Check/correct the pressures of all four tires
and reset TPMS in the menu display .
11@1&1 (Tire Pressure Monitoring System) Tire
pressure! System malfunction . Ifll@IS, ap­
pears after switching the ignition on or while
driving ¢
fig. 173 and the indicator light ti] in
the instrument cluster blinks for approx i­
mately one minute and then stays on, there is
a system malfunction. See your autho rized
Audi dealer as soon as possible.
A WARNING
-If the tire pressure indicator appears in
the instrument cluster display, one or
more of your tires is significantly under­
inflated. Reduce your speed immediately
and avoid any hard steering or braking ..,.

244 Fuses and bulbs
Fuse Location, Instrument Panel left
Fuses which can be replaced.
Fig. 191 Cockp it driver 's s ide: fuse pane l layout
Note that the following table is accurate at
the time of going to pr ess and i s subject to
change . In the event of d iscrepancies, the la­
bel on the in side of the cover always take s
pr eceden ce .
The power seats are protected by circuit
break ers,
which automatically reset after a
few seconds after the ove rload has been rem­
ed ied .
Equipment
Manua l head light beam ad­
justment, a utomat ic head­
light beam adjustment, AFS
1 co ntrol m odule, engine
components, light switch
(switch lighting/illumina­
ti on), diagnosis socke t
2
3
4
5
6
8
9
Automatic transmission,
control module for CAN data
transfer (gateway), electro­
mechanical steering, shift
gate automatic transmis­
sion, fuel tank control unit,
engine control unit, brakes
control (A BS), Electronic
Stabili zation Program (ESP) ,
Anti-Slip Regulation (ASR)
Air bag
Air-conditioning (pressure
sensor, air quality sensor), button for Electronic Stabili ­
zation Program (ESP), Anti ­
Slip Regulat ion
(ASR), tire
pressure monitor display, oil
level senso r, back-up ligh t
s w itch, front se at he ati ng ,
p ark ing aid, sea t-occupancy
recognition (on USA vehi ­
cles), garage door opener,
automa tic mirror dimming,
headlight assistant, heated
windshield washer nozzles, air conditioning (control
module)
AFS headlights ( left si de)
AFS headlights (right side) Instr ument cluster
Navigation system, radio
system
1 0 digital
radio, cell phone, TV
equipment
11 Automatic mirror dimming,
headlight assistant
12 Central lock ing (front doors)
Central locking ( rear doors)
Amps
10
10
5
5
5
5
5
15
7 ,5
10
10
10

No. Equ ipment
Electronic Stabilization Pro-
14
gram (ESP) (control mod-
u le), shift gate automatic
transmission
15 Interior lights, reading
lights
Diagnostic connector, rain
sensor, air conditioning
16 (control module), t
ire pres-
sure monitor d isplay (con-
trol module)
I 17
Anti-theft alarm warning
system
18 D iagnose Starter
19 All Wheel D rive
20 Audi magnetic ride
Blower fan
23
Driver's
side power window,
front
24 Power outlet front
2S Rear window defogger
26 Power outlet in luggage
compartment
27 Fuel tank control module,
fuel pump
28 Power window, rear
33 Slidi ng/pop-up roof
36 Lumbar support
37 Heated sea ts, front
1 38
Passenger side power win-
dow, front
39 Specia l func tion interface
40 Starter
41 Rear window wiper
43 Body control module
47
Ce ll phone package (V OA in-
terface)
Automatic circuit breakers:
10
10
10
5
5
10
40
30
20
30
20
15
30
20 10
20
30
5
40
15
20 5
The electri c power w in dows and the e lectr ic
seat adjusters are pro tected with circu it
breake rs which reset automatically after the
circuit overload has been corrected.
Fu se s and bulb s 245
@ Tips
-Whenever rep lacing a fuse, always con­
sult the sticker on the inside of the f use
pane l cover. It contains the most up-to­
date information regarding the fuse ar­
rangement. If in doubt, ask your author­
ized Aud i Service adviso r.
- Some of the equipment items listed are
opt ional or only available on certa in
mode l configurations.
Fuse location, left side of engine
compartment
Fig . 192 En gine compar tment : fuse assig nment
,._
-d. a, a>
Check the fuse layout with the f use panel cov­
er removed
¢ page 243, Fuse cover in engine
comportment.
Some of the equipmen t items listed are op­
tiona l or only ava ilab le on certain model con ­
figurations.
Please note tha t the preced ing tab le was ac­
c u rate at the time of pr int ing and is subject to
c h ange.
No. Equipment
F2 Engine compone nts
F3 Battery voltage ESP valves, Anti-lock brake
F4 system (ABS) valves
Transmission control mod­
F5 ule
F6 Steering wheel e lectronics
Amps
20
5
20
15
s

246 Fuses and bulbs
I
I
I
No. Equipment
FlO Engine control module,
main relay
Control module for CAN da­
F12 ta transfer (gateway)
F13 Engine control module (die­
sel engine/gasoline engine)
Fl 4 Engine components (diesel
engine), ignition coils
FlS
F16
F17
F18 Preheating control module/
engine component, tank di­
agnosis, oxygen sensor
Body control module (right)
Horn
Audio amplifier
Flg Front windshield wiper sys­
tem
F 2 0
Water pump/volume regula­
tor valve
F22
F23
F24
F25
F26 Oxygen sensor (diesel en­
gine/gasoline engine)/vac­
uum pump
C
lutch pedal switch, brake
light switch
Engine relay, water pump/
engine components/volume regulator valve
Eng ine components, water
pump
Pump (ESP/ABS), ABS valve
Body control module (left)
-Amps
5/10
5
15,20,
25/30
20
5/10 30 15
--30
30
10/15, 20
10/15 /20
5
5/10
/15
10
40
-·-- --·-
30
40
F27 Secondary
air pump, pre-
heating control module
__ , ..
F29 Fuse assignment in the left­
side instrument pane l (spe-
cia l equipment)
Power supply relay terminal
15 so
so
Bulbs
Replacing light bulbs
For your safety, we recommend that you have
your authorized Audi dealer replace burned
out bulbs for you.
It is becoming increasingly more and more
difficult to replace vehicle light bulbs since in
many cases, other parts of the car must first
be removed before you are able to get to the
bulb. This applies especially to the light bulbs
in the front of your ca r which you can only
reach through the engine compartment.
Sheet metal and bulb holders can have sharp
edges that can cause serious cuts, and parts
must be cor rectly taken apart and then prop­
erly put back together to help prevent break­
age of parts and long term damage from wa ­
ter that can enter housings that have not been
properly re sea led.
For your safety, we recommend that you have
your authorized Audi dea ler replace any bulbs
for you, since your dealer has the proper tools,
the correct bulbs and the expertise.
Gas discharge lamp s (Xenon lights)*:
Due to the high e lectr ica l voltage, have the
bulbs replaced by a qualified techn ic ian.
Head lights with Xenon light can be identified
by the high voltage sticker.
_& WARNING ~
Contact with high-vo ltage components of
the electrical system and improper re­
placement of gas discharge (Xenon) head­
light bulbs can cause serious personal in­
jury and death.
- Xenon bulbs are pressur ized and can ex­
plode when being changed.
- Changing Xenon lamps requires the spe­
cial tra ining, instructions and equip­
ment.
- On ly an authorized Audi dealer or other
qualified workshop should change the bulbs in gas discharge lamps .

264 Index .:..:..:..::....::..
...:..._ ___________________________ _
A
ABS
refer to Anti-lock brake system . ... .. . 164
Accessories .. ... .. ..... ... .. .. .. .. . 26 1
Acoust ic park assist ........ .. .. .... .. 93
AC (a ir cond itioner) ......... .. .. .. .. .. 81
Adapter for anti-theft wheel bolts . .. .. . 238
Adaptive light
defective . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Adding Engine coolant .......... .... ..... . 204
Engine oil . ...... ....... ... .. .... . 200
Windshield washer fluid ............ 211
Addit ional accessories .......... .... . 261
Additional heater Climate controls . . . . . . . . . . . . . . . . . . . . 85
Additives Engine oil . ............... ... .. .. . 200
Adj ustab le steering wheel column .... .. 88
Adjusting Steer ing wheel column ........ .. .... 88
Adjusting front seats ........ ... .... .. 61
Advanced Airbag System
Components ... .......... .. .. .. .. . 129
Fr ont airbags ................ .... . 127
How the components work together .. 130
Monitoring ................. ..... . 133
PASS ENG ER A IR BAG OFF light .. .... . 133
A irbag
Warning/indicator lights ............. 16
A irbag system . . . . . . . . . . . . . . . . . 122, 139
Advanced Airbag System . . . . . . . . . . . . 126
Care . .. .. ............... .. .. .... . 135
Ch ildren . .... ........... .. .. .. .. . 144
Ch ild r estra ints ........... .. .. .. .. . 145
Components (front airbags) . ... .... . 129
Danger of fitting a child safety seat on
the front passenger seat . . . . . . . . . . . . 123
Disposal . ................. .. .... . 135
Front airbags . ........... .. .. .... . 126
How do the front airbags work? . . . . . . 131
H ow many airbags does my vehicle
have? ..... .......... ...... ... .. . 129
I mportant things to know .... .. .... . 122
I ndicator light ........... .. .. .. .. . 133
Monitoring ................. ..... . 133 Repairs ...
.... .. ............. .... 135
Side airbags ..... ................ . 137
S ide curtain airbags ................ 140
When must the system be inspected? 133
Airbag System
Weight-sensing mat .............. . 144
Air conditioner .. .. ................ .. 81
also refer to Climate controls .. .. .. .. . 79
Air conditioning Switching on and off ........... .. .. . 81
Air distribution Climate controls . ................. .. 83
Air outlets Adjusting the outlets for rapid defrost -
ing/defogging ... ................ .. 84
Climate controls . .............. ..... 84
Air quality sensor . . . . . . . . . . . . . . . . . . . . 82
Air recirculation . .. ... .......... .... . 83
Climate controls .. ............. .... . 82
When should I use the air recirculation? 82
Air recirculation mode Climate controls . ................. .. 82
All-wheel drive Winter tires ... .. ... .......... .... 227
Alloy wheels ...... ................ . 182
All Wheel Drive .... ............. .... 166
Alternator
refer to Generator ............. .. .. . 16
Aluminum alloy wheels .... ...... .... 182
Ambient lighting . . . . . . . . . . . . . . . . . . . . 52
Anti-lock brake system How the ABS system works ........ .. 164
Warning/ind icator lights ........ .. .. . 18
Anti -theft systems
Anti-Theft Alarm System . . . . . . . . . . . . . 42
Anti-theft wheel bolts ........... .... 238
Armrest Center armrest . . . . . . . . . . . . . . . . . . . . . 66
Rear armrest .... ................ .. 67
Asterisk What does it mean when something is
marked with an aster isk? ........ .... .. 6
Audi magnetic ride . . . . . . . . . . . . . . . 22, 9S
Description . . . . . . . . . . . . . . . . . . . . . . . . 95
Indicator light ... ....... ...... .. .. . 22
Audi Service Repair Manuals and Litera-
ture 259

268 Index
Eme rgency towing ......... .. .. .... . 251
E ne rgy management ........... .. ... 167
Ba ttery power ........... .... .. .. . 168
Dr iver notific ation ...... .. .. .. .. .. . 16 8
Eng ine
4-cylinder diesel (140 hp) ....... .... 197
4-cyl ind er g asoline (200 hp) .. .. .. ... 196
Coolant .. ... ............ .. .. .. .. . 203
H ood .. ...... ........... .. .. .... . 194
Pr ehea ter . . . . . . . . . . . . . . . . . . . . . . . . . 86
Start ing . . . . . . . . . . . . . . . . . . . . . . 89, 90
Starting with j umper cab les . ..... .. . 248
Stopping . . . . . . . . . . . . . . . . . . . . . . . . . . 91
E ng ine compartmen t ................ 196
Safety instruc tions .......... .. .... . 194
Working in the engine compar tment .. 194
Eng ine coolant system ........... .... 203
Adding coo lant ............ ... .. .. . 204
Chec king coolan t leve l ..... .. .. .... . 204
Che cking the eng ine coolant leve l ..... 204
M alfunct ion . . . . . . . . . . . . . . . . . . . . . . . 17
Radiator fan . .. .. ..... ... .. .. .... . 205
E ng ine coolant temperature
Gauge ... .. ................ ... .. .. 11
Eng ine data .. ............... ...... . 257
Engine fault Warning light .. .. ..... ... .. .. .... .. 20
E ng ine hood
C lo sing .. .. ............. .. .. .. .. . 194
Release lever . ........... .... .... . 194
Releasing and open ing . ... .. ... ... . 194
Eng ine malfunction (diesel engine)
War ning light ............ .. .. .... .. 20
Eng ine oil . ............... .. .. .... . 197
Adding .. .. ............... .... .. . 200
Addit ives . .. ................ ... ... 200
C hanging .. ... .... ...... ... ... .. . 20 1
Chec king the eng ine o il level .. .. .. .. . 200
Di ese l eng ine ............ .. .. .... . 20 2
I ndications and con ditions req uiring ex-
tra check ing . .. .. ..... ... .. .. .... . 200
Oil consumption .. ..... ... .. .. .... . 199
Oi l grades . .... . ...... ... .. .. .... . 197
Recommended oil check intervals ..... 200
Specification and viscos ity .... .. .... . 197
Specifications Diesel engine .. .... ... 202
Specifications gasoline engine .. .. ... 197
Tempe ratu re d isplay ...... .. .. .. .. . . 31 E
ngine oi l leve l . . . . . . . . . . . . . . . . . . . . . . 20
E ngine o il pressu re (malfunction) ....... 16
Engine oil sensor defective ............ 20
En gine preheate r .................... 86
C onnect ing . ..... .. ... ..... ... .. .. . 86
E ngine speed limitation . . . . . . . . . . . . . . . 20
Environment Break-in per iod . .. ............. .... 169
Catalytic converter ............. .... 170
Diesel particulate f ilter ............ . 171
D ispos ing of your veh icle battery ... .. 210
D riv ing at high speeds .............. 172
D riving to minimize pollution and noise 171
F uel ............................. 192
F uel economy . . . . . . . . . . . . . . . . . . . . . 171
Leaks under your vehicle ..... ... .. .. 194
Letting the vehicle stand and warm up . 172
Proper d isposal of drained bra ke fluid . 206
Proper disposal of drained eng ine cool-
ant ............................. 204
Proper d isposal of drained eng ine
o il . . . . . . . . . . . . . . . . . . . . . . . . . 200, 201
Recycling used engine oil ............ 200
U nleaded fuel . ... ................ . 189
Wha t shou ld I do w ith an o ld b att ery? . 210
EPC
refer to E lect ron ic power co ntrol ... .. . 19
Event Data Recorder (EDR) ........ .... 161
E xh aus t tai l pipes
Cleaning .. .... .. ............. .... 183
Expansion tank .. .. ................ . 204
Exterior mirrors Adjusting . . . . . . . . . . . . . . . . . . . . . . . . . 53
Dimming .......................... 54
Heating ........................... 53
F
Fahrenheit
Switching between Fa hrenhe it and Centi-
grade ....... .... .... ........... .. 83
F an
Adjusting the fan speed ...... .... . .. . 83
Climate controls ............... .. .. . 83
Radiator ......................... 205

Lifting jack .... .... .... ... .. .. .. ... 239
Lifting po ints ...................... 253
Light coming/leaving home ............... 48
Exterior lighting .......... .......... 48
Light/ra in sensor defective . ... .. .. .. .. 22
Lights .. .. ..... ........... ...... ... 47
E mergency flasher . . . . . . . . . . . . . . . . . . SO
Fr ont fog l igh ts .......... .... .. .. .. 49
H eadlig hts ... .... .... ... .. .. .. .... 47
High beam . . . . . . . . . . . . . . . . . . . . 47, 50
Instrument panel i llum ination . ... .. .. 49
Side marker lights ........ ...... .... 47
Turn signals .. ........... .. .. .. .... 50
Xeno n headlights ................... 47
L oading the l uggage compartment . ... . 109
L oading the roof rack . . . . . . . . . . . . . . . . . 73
Locking Manual back-up .......... .. .. .. .. .. 41
Power locking switch . . . . . . . . . . . . . . . . 39
Rear lid .. ..... ........... ...... ... 40
Remote control . . . . . . . . . . . . . . . . . . . . 3 7
Using the fo ld-out key . . . . . . . . . . . . . . . 38
Lower universa l anchorage bars (Canada) 155
L ower universa l anchorages (Canada) 155
L uggage
Stowing . .. ..... ....... .... ... .. . 109
Luggage compartment
Cargo net .. ............. .... .. .... 69
Fasten ing eyes .................. ... 68
Increasing size ... .. ... ... .. .. .. .. .. 67
L ight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Re tractable cover . . . . . . . . . . . . . . . . . . . 70
Ski sack . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
also refer to Loading the l uggage com ­
partment . . . . . . . . . . . . . . . . . . . . . . . . 109
L umbar support ..................... 64
M
Maintenance ............... ...... .. 259
M alfunction Indicator Lamp (MIL) . . 1 9, 25
M anual tra nsmission ................. 96
G ea rshift lever ........... .. .. .. .. .. 96
Master key . ................ ...... ... 35
Battery replacement ................ 35
Master key remote control ... .. .. .. .. .. 35
Inde x 271
Menu bu tton . ..... .. . .. .. ..... ... .. . 28
Menu display Drive r Infor mation Display ........... 27
Mirrors Activating the dig ital compass ........ 59
Adjus ting the exterior m irrors . . . . . . . . . 53
dimming ........ .. ................ 54
Monitoring the Advanced Airbag System 133
Mo unti ng hoo ks . . . . . . . . . . . . . . . . . . . . . 69
N
Natura l leather .. .. .. ..... .......... 185
New t ires and wheels ................ 223
N HT SA
Co ntacting . ... .... . ... ...... ... .. 111
Number of sea ts ... .. ............... 113
0
Occupant seating positions .......... . 104
Octane rating ....... . .. .. ..... ... .. 189
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Oil Wha t kind of oil should I put in my en-
gine? ........ ... .. ............... 197
also refer to Engine o il ... ... ..... .. 197
On-Board D iagnost ic System ........... 25
E lectronic speed limiter .............. 2S
Malfunction Indicator Lamp (MIL) ..... 25
On-Boa rd Diagnostic System (OBD) ... .. . 24
Data Link Connector ( DLC) .... ... .. .. . 24
Open door o r fron t lid wa rn ing ......... 23
Operate your vehicle economically and
minimize pollution ... . .. .... ...... .. 171
Optional eq uipment
Marked with an asterisk . . . . . . . . . . . . . . . 6
O ther equ ipment (e fficiency program) ... 29
Out lets ............................ 75
Outside ai r poll ution
How to prevent from entering the vehi-
cle ............................... 83
Outs ide mir ro rs
refer to E xterio r mi rro rs . . . . . . . . . . . . . 53
Outs ide temperature disp lay ......... .. 23
Owner's manual How the Owner 's Manual is organ ized ... 6
•
•