sensor AUDI A4 AVANT 2008 Owners Manual

When the ignition is switched off, the odometer reading and the digital clock with date display can be switched on for a few seconds
by pressing the CHECK
button~ page 12, fig. 2 @ . •
Instrument cluster illumination
It is possible to adjust the instrument cluster illumination.
Fig. 4 In str um ent
c luster i lluminatio n
- Press the"+" button to increase the brightness .
- Press the"-" button to dim the br ightness.
A light sensor in the instrument cluster contro ls the illumina tion for
the instrument cluster, the center conso le and the displays.
The illumination for the instrument cluster lights up whenever you
sw itch on the ignition with the
vehicle h eadlight s off. As the
daylight fades, the instrument c luster illumination likewise dims
automatically and wi ll go out comp lete ly when the outside light is
very low . This feature is meant to remind you to switch on the head­
lights when the outside light conditions become poor .
•
Controls and equip­
ment
In st rum ents and w arning /indi cator li ght s
Speedometer with odometer
The speedometer shows you the vehicle speed, and the
odometer shows you how many miles (kilometers) you
have driven .
miles 1S3. 9
S2YY
Fig . 5 Sp eedom eter
c lose-u p: od omete r
di sp lay
The odometer and trip odometer are located inside the speedom ­
eter .
• USA models -Miles
• Canadian models -Kilometers
Low er odom ete r
The lower odometer shows the total number of miles (ki lometers)
d riven .
Upper odometer (tri p odometer )
The upper odometer shows the total number of miles (kilometers)
driven since you last reset the odometer to zero . You can use this
odometer when you want to keep track of how many miles (kilome ­
ters) you have driven for a single trip or errand. The last digit indi ­
cates 1/10 of a m ile (100 meters) . You can set the trip odo meter back
to zero by pressing the reset
button~ fig. 5. -..
irechnical data

Instruments and warnin g/indi cat or li ghts
Safety belts i
This warning/indicator light reminds y ou to put on your
safety belt.
The .ft warning/indicator light i lluminates when the ignition is
switched on to remind the driver and (on USA mode ls only) any front
passenger to put on the safety belt. Additiona lly, an acoustic
warn ing (gong) w ill also sound.
For more
information~ page 176 , "Safety belt warning light 4". •
Turn signals ¢ ¢
The in dicator light flashes when you use either turn
signal.
Whenever you use the left ¢ or the right ¢ turn signal, the indicator
l ight flashes. W hen you use the emerge ncy flasher, both indicator
lights f lash .
I f one of the turn signal light bulbs burn out, the turn signal will
flash twice as fast as normal. •
Electronic Stabilization Program (ESP) fJ
The warning/indicator ligh t monit ors the electr onic s tabi ­
lization program.
The ~ warning/indicator light has the fol lowing functions:
• it flashes while you are driving, when the ESP is working .
• it illuminates when you switch on the ignition for approximately
2 seconds as a funct ion check.
• it illuminates when there is a ma lfunction in the ESP.
• it illuminates after the battery has been disconnected .
• it illuminates continuous ly when the ESP is switched off . •
it illuminates if there is a malfunction in the ABS, since the ESP
is part o f the ABS system.
If the ESP warning/indicator light illuminates and stays on after you
have started the engine, this may mean that the control system has
temporar ily switched o ff the ESP . If this is case, you can reactivate
the ESP by switching the ignition off and then on again . The
warning/indicator light should go out to show that the system is
ful ly functional again .
I f the battery terminals were disconnected and re -connected, the
vehic le was jump started or the battery is very weak, the ESP sensor
system goes through a learning p rocess for the firs t few yards.
D uring th is time, t he ind icator l ight i llu minates. It goes out as soo n
as the learning process is comp lete.
For more information about the
ESP ~ page 236. •
Generator 0
T his warning/indicator light detects a malfunction in the
generator or i n t he vehicle's elec trical system.
T he O warning/indicator light i lluminates w hen you switch on the
ignition and must go out after the engine has started .
I f the
O warni ng/ind icator light illum inates while you a re driv ing,
you shou ld contact your authorized Audi dealer . Since the vehicle
battery is dischargi ng, you should sw itch off any unnecessary elec ­
trical consumers (for example, the air conditioner) .
0 Note
If the _JL warning/indicator light (ma lfunction in the engine coo ling
system) i n the instrument cluster shou ld
i llumi nate ~ page 31, stop
the ve hicle and turn o ff the engine . The coo lant pump is not work ing
-this can cause engine damage! •

[ i J Tips
• The engine oil pressure symbol ~ is not an indicator for a low
engine oil level. Do not rely on it . Instead , check the oil level in your
engine at regular interval s, preferably each time you refuel , and
always before going on a long trip.
• The yellow oil level warning indication requires oil refill or
workshop service without delay . Do not wait until the red oil pre s­
s ure warning symbol
~ starts to fla sh before you respond to the
low oil level warning
-... . By then , your engine may already have
s uffered serious damage. •
Yellow symbols
A yellow symbol means WARNING .
Yellow symbols mean:
Controls and equip ­
ment
Fig . 2 0 Display : lo w
fu el lev el warn ing
( priority 2 )
Driver information display
Low fuel leve l ~ page34
Check engine oil level ~ page34
Engine oil sensor malfunction ~ page34
-
Light/rain* senso r defective ~ page34
Worn b rake pad s ~ page34
USA models: ~ page34 Speed wa rn ing 1 ..
Canada models: ~ page34 Speed wa rning 1
Dyn amic headl ight ra nge con-
~ page34 trol* defect ive
W inds hield washer fluid level low
~ page34
-
USA models : ~ page34 Speed warn ing 2
Canada models : ~ page34 Speed war ning 2
Battery voltage too high or too
~ page35 low
Defective light bulb
~ page35
Adaptiv e light* defective ~ page35
Ye llow symbo ls ind icate a p riority 2 mal funct ion - Warning!
When a yellow symbo l appears, a warning tone wil l sound
once.
Check the displaye d functio n as so on as possi ble. I f more than one ._
irechnical data

Driver inf ormation di spl ay
priority 2 malfunction is detected, al l symbols will appear one after
t he other for about two seconds. •
Applie s to ve hicles: with Ligh ting pac kage
Light/rain* sensor defective fif>
~o Aut om atic hea dlig ht s/a utom atic w ipers defe ct iv e
If the symbol il luminates, the light /rain sensor has failed. For safety
reasons the low beams a re turned on permanently with the switch
in
AUTO. H owever, you can continue to turn the lights on and off
using the light sw itch . In the case of a defect in the ra in se nsor, the
windshield wiper lever functions are still available. Have the
l ight/ra in sensor checked as soon as poss ible at a dealersh ip .•
Fuel supply too low flt)
When the .ffi symbol illuminates, th is means there is about 2 to 2 .5
gallons (8 to 10 l itres) of fue l left in the fue l tank. Time to refuel!
=> page 268 . •
Checking the engine oil level ~ ..
When the ~ symbol illum inates, check the engine o il leve l as soon
as
possib le => page 277. Top off the oil at your ear liest opportunity
=> page 278 . •
Engine oil sensor defective ~ ...
If the ~-symbo l il lum inates, contact your authorized Audi dea ler
and have the oil sensor inspected . Until you have this done, check
the oi l leve l each t ime you refuel just to be on t he safe side
=> page 277. •
Worn brake pads 0
If the O symbo l illuminates, contact your authorized Audi dealer to
have the front brake pads inspected (on that occasion have the rear
brakes inspected as we ll to be safe) .•
Speed warning 1 8 (USA models)/ 0 (Canada
models)
I f the 0 symbo l il luminates, this means you are driving faster than
the set vehicle speed. Slow
down! => page 35. •
Applies to ve hicles : w ith d ynami c head light rang e adjus tment
Headlight range control defective {a:>
If the t0 illuminates, the dynamic head light range control is no
longer working properly. Have the system checked a nd repaired at
your Audi dealer .•
t·,···
Windshield washer fluid level too low <;p
If the O symbol illuminates, add windshield washer fluid to the
washer system and a lso fo r the headlight washer system*
=> page 291. •
Speed warning 2
0, (USA models)/ 9. (Canada models)
If the 0 symbol illum inates, this means you have driven faster than
the second set vehic le speed . S low
down!=> page 35 . •

Driver inf ormation di spl ay
tire pressure, even if under-inflation has not reached the level to
t rigger il lum ination of the TPMS low tire pressure te llta le .
• Each tire should be checked month ly when cold and inflated to
the infla tion pressure recommended by the vehic le manufacturer
on the vehicle placard , tire inflation pressure label, or in chapter
=> page 297 . (If your ve hicle has tires o f a different size than t he size
indicated on the vehicle placard or tire inf lation pressure label, you
should de termine the proper tire inflation pressure for those
tires.) •
Applies to vehi cles : with tire p ress ure mo nit o ring system
TPMS malfunction indicator
Your vehic le has also been equipped with a TPMS ma lfunction indi ­
cator to indicate when the system is not operating properly. The
TPMS ma lfunct ion indicator is combined with the low tire pressure
telltale . When the system detects a ma lfunction, t he tellta le wi ll
f lash for approximately one minute and then remain continuous ly
il lum inated. T his sequence wil l continue upo n subsequent veh icle
star ts up as long as the malfunction exists.
When the ma lfunc tion ind icator is ill uminated, 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 o f rep lacement or a lternate tires or wheels on the
vehic le that prevent the TPMS from functioning properly . A lways
check t he TPMS malfunction tellta le after replac ing one or more
tires or whee ls on your v ehicle to ensur e that the replacement or
a lternate t ires and wheels al low the TP MS to continue to function
proper ly. •
Ap plies to ve hicles : w it h tir e pressu re m oni to ring sy ste m
Introduction
T he tire pressure monitoring system monitors air pressure
in all four road wheels while the vehicle is moving.
As soon as the tire pressure monito ring system se nses a significant
loss of air pressure in one or several tires, text messages and yel low
symbo ls appear in the instrument clus ter disp lay to a lert the driver.
The
(l) warning light in the instrument cluster comes on when the
t ire is significa ntly under inflated.
The warning light
(l) also lights up during a system failure .
When the whee l is turning, the system receives radio signals from
sensors located inside each tire.
A factory spare wheel is delivered with sensor . However, the spare
whee l is not checked by the ti re pressure monitoring sys tem. Such
monitoring can on ly occur after the spare wheel has been insta lled
and
initia lized => page 50.
Be aware that t ire pressure is a lso dependent o n the temperature of
the tire . For every 18 °F (1
O °C) increase in tire temperature, tire pres ­
su re increases by about 1.5 psi (0 .1 barl. The tire warms up wh ile the
vehic le is moving and t ire pressure rises. So you should adjust tire
pressure only when they are
cold, when tire temperature is roughly
the same as ambient air temperature .
I n order to keep the tire pressure moni toring system prope rly ca li­
brated, tire pressure on all four tires shou ld be checked at regular
intervals, adjusted if necessary and saved in the proper sett ing
(reco mmended
pressure) => page 48.
The tire pressure is shown on the tire pressure label. On USA vehi ­
cles, the tire pressure label is located on the dr iver's side B -pillar. On
Canada vehicles, the tire pressure labe l is located either on the
driver's side B -p illar o r inside the fue l fi ller flap. The tire pressure
label l ists the recommended cold tire inflation pressures for the
vehic le at its maximum capacity weight and the tires that were on
your vehicle at the t ime it was manu factured . For recommended tire
~

pressures for normal load conditions, p lease see chapter
~ p ag e 297 .
& WARNING
• When the tire pre ssure monitoring sy stem warning light i s lit ,
one or more of your tires is sign ifi cantly under-inflated . You should
s top and check your tire s as soon as possible , and inflate them to
the p rope r pres sure a s indicated on the vehicle's tire pre ssure
label
~ page 297 . Driving on a significantly under -inflated tire
c ause s the t ire to overheat and can lead to tire failure . Under -infla ­
tion also is likely to impair the vehicle's handling and stopping
ability .
• Do not adjust tire pre ssure when tire temperature is excessive.
Thi s could lead to serious tire damage and even cause the tire to
burst , with the additional danger of an ac cident .
<£' For the sake of the environment
Driving wi th under -inflated tires reduces fuel efficiency and tire
tread life.
[ i ] Tips
• Each tire should be checked mon th ly when cold and set to the
recommended inf lat ion pressure as specified on the tire pressure
table~ page 297 .
• The tire pre ssur e monito ring system he lp s the drive r to kee p
t rack of the tire pressures. But the d river s til l has the responsibi lity
for maintaining the correct tire p ressure .
• Tire pressure must only be adjusted when th e temperature of the
t ires is about the same as am bien t air temperatu re .
• When tires are replaced , the sensors and va lves must not be
detached or exchanged. Only the valve co re needs t o be rep laced
and, if necessary, the valve and the wheel e lectronics replaced.
Controls and equip ­
ment
Driver information display
• If you should put different whee ls and tires on your vehic le (e .g.
win ter wheels a nd ti res), you must be certa in that the wheels a nd
tires are compatible with the t ire pressure monitoring system .
O therwise the system will register a ma lfunction and a fau lt
message will be displayed. For more information, contact your Audi
dea ler .•
Ap plie s to veh ic les: with tir e pr ess ure mon ito ring syste m
Significant loss of air pressure 1
The yello w symbo l app ear s in the e ve n t of a s ignific a n t
Jo ss of air pre ss ure.
Fig . 36 Hi -lin e di splay:
y ellow s ymbol w ith
message ....
irechnical data

-select Whe el ch ange in the Tir e pr ess ure menu.
Programming is necessary:
• aft e r rotating th e wh eels on the vehicle,
• if whee ls with new wheel sensors are used .
Your tire change is incomplet e if you do no t access the Driver Infor­
mation System menu, and select and confirm
Wh eel ch ang e. You
mus t do this each time to change a tire. The procedure can take up
to 20 minutes driving time. During this time, the sensors are read ­
justing to the new wheel/tire combination, and the new pressures are stored .
During the learning phase, the tire pressure monitoring system is
not availabl e.•
App lies to veh ic les: w ith tir e p ressure monitor in g sys tern
Malfunctions
A ma/function can have various causes.
F ig . 44 D isplay:
Syste m malfun ction
If the warning light in the instrument cluster flashes for approxi­
mately one minute and then remains continuously illuminated and
Controls and equip ­
ment
Dri ver inf orma tio n di spl ay
additional ly the => fig. 44 symbol appears in the display, the
tire pressure monitoring system is not available . This can have
various causes.
• If the message appears at the end of the learning phase, the
system cannot recognize the wheels insta lled on the vehicle . This
can be because one or more wheels without a wheel sensor were
installed .
• A wheel sensor or other component may have failed.
• The system has detected more than 4 wheels in the vehicle, for
example while driving beneath another car with tire pressure moni ­
toring system .
• A tire was changed but
the => page 50, "Changing a wheel"
procedure was not activated
=> page 50.
• Audi replacement parts were not used .
• If snow chains are being used , system function can be compro ­
mised due to the shie lding properties of the chains .
• The tire pressure monitoring system may not be available
because of a radio malfunction .
• Transmitters with the same frequency , such as radio head ­
phones in the vehicle or radio equipment, can cause a temporary
dis ruption of the system through excessive el ectromagn etic fie lds.
• Try to find the cause of the interference, and then perform the
=> page 50, "Changing a wheel" procedure one more time . If this not
e liminate the prob lem , contact your authorized Audi dea ler for
assistance .
• Do not use commercially available tire sealants. Otherwise , the
electrica l components of the tire pressure monitoring system will
no longer work properly and the sensor for the tire pressure moni­
toring system will have to be replac ed by a qualified workshop. •
Technical data

[ i J Tips
• For the anti-theft a larm system to function properly, make sure
all vehicle doors and windows are closed before leaving the vehicle.
• When you open the vehicle from the driver's door using the key,
the central locking switch will work only after you have switched on
the ignition .•
$ Tilt sensors ~
The tilt sensors trigger an alarm if they detect vehicle
movement.
Fig. 62 Driver's door,
rear bottom: tilt sensor
switch
Switch off the tilt sensors if you are going to have your
vehicle transported.
Switch off the tilt sensors
- Press the switch~ located in the driver's door~ fig. 62.
- Lock the vehicle.
Controls and equip ­
ment
Opening and closing
When you turn off the tilt sensors, the diode in the switch -IQ will illu­
minate. Also, the indicator light in the door trim will illuminate for
about three seconds . After you lock the vehicle, the indicator light
in the door trim will blink quickly for about three seconds. After that,
the blinking slows down.
The next time the vehicle is locked, the tilt sensors are automatically
turned on again. •
Power windows
Controls
Fig. 63 Driver's door :
power window
switches
The switches are located in the driver's door. The front passenger's
door has a own power window switch of its own .
To open/close If the respective switch is pushed or pulled, the
window will, respectively .
Switches for front door windows
@ operates the window in the driver 's door.
@ operates the window in the front passenger's door.
irechnical data

[ i] Tip s
• If you remove the ignition from the ignit ion lock whi le the head­
lights are still on, a buzzer wi ll sound as long as the driver's door is
open to remind you to switch off the lights.
• Always observe the specific loca l regu lat ions for your area when
to use your lights. •
Applies to veh icles : w ith ligh t sens or p ackag e
Sensor activated head- and tail light control
In the "AUTO" position light sensors switch the head -and
tail lights on and off.
Activating
Fig . 70 In stru ment
pane l: light swit ch in
A UTO po siti on
-Tur n th e light swi tch => fig. 70 to pos iti on AUTO.
Deactivating
-Tu rn the light sw itch to posit ion 0.
Controls and equip ­
ment
Cl ea r vision
In the switch position AUTO the aut omatic head -and taillight
control is activated . The correspo nding symbol on the light sw itch
is li t.
Light sensors located in the inside mirror housing and stem
constantly check the lig ht conditio ns surrounding t he ve hicle . If
ambient brightness falls below a factory set value (e.g . when driving
into a tunnel!, the head -and tai llights i nc ludi ng the l icense plate
il lumination are automatically turned on. When ambient brightness
increases again, t he external lights are turned off
aga in => & .
& WARNING
• Autom atic head - and taillight control is only intended to as sis t
the dri ver . Th is feature does not rel ieve the driver of h is respons i­
bili ty to check the headlights and to turn them on manually
a ccord ing to the current light and visibility conditions . For
example , fog and rain cannot be detected by the light sen sors.
Consequently , alway s swit ch the headlight s
io on under these
weather condition s and when driving in the dark .
• Cras hes c an happen when you c annot see the road ahe ad and
when you cannot be seen by other motori sts.
• Alwa ys turn on the headlight s so that you can see ahead and
s o that others can see your car from the back.
[ i ] Tips
• In the AUTO mode, the low bea ms are turned off w hen t he ign i­
tion is turned off. The remaining lights are turned off when th e ke y
is take n out of the ignition lock .
• Do not attach stickers to the windshie ld in front of the sensors as
this can disab le the automat ic head -and taill ight contro l and the
automa tic glare-dimming of the rearview mirror(sl.
• Always observe the spec ific loca l regulations for your area when
to use your lights.
• In the event of a light sensor ma lfunction, the drive r inf ormat ion
display wi ll show the
symbol ~. If a light sensor malfunction is indi -..,

Applies to vehi cles: with Ligh ting p ackag e
Coming home/leaving home function
The coming home/leaving home function switches on the
external lights on a vehicle parked in the dark to illumi ­
nate the surroundings.
Activating the function
Fig. 75 Dashboard
detail : coming
home/leaving home
switch beside light
switch
- Briefly press the knob => fig. 75 (colored dot) so it will
stand out from the panel.
- Turn the knob to position
1.
- Push the knob back in to secure its setting.
Deactivating the function
- Briefly press the knob => fig. 75 so it will stand out from
the panel.
- Turn the knob to position
0.
- Push the knob back in to secure its setting.
Controls and equip ­
ment
Clear vision
The coming home/leaving home function is controlled by light
sensors located in the inside mirror housing and stem. The system
is activated if all of the conditions below are fulfilled :
• the knob has been turned to position
1
• the driving lights and the ignition have been switched off
• the vehicle is parked in poor light or darkness with the sensors
detecting little or no light at all.
Coming home situation
In darkness, the activated system will turn on the front fog lights and
rear licence plate light as soon as the driver's door is opened from
inside .
As long as one of the doors or the rear lid remains open, the set of
external lights will keep burning for about two minutes maximum.
To provide light for departure, the set of vehicle lights will keep
burning for about another 30 seconds after all doors and the rear lid
have been closed.
The factory -set time of 30 seconds until the lights are switched off
can be adjusted if you prefer a longer or shorter duration. Have the
adjustment done by your Audi dealer or a qualified workshop. The
system can be adjusted to keep the lights burning for a maximum
of 60 seconds.
Leaving home situation
As soon as the vehicle is unlocked by pressing the ti button on your
remote control, the set of external lights is switched on.
The external lights are switched off as soon as the driver's door is
opened from outside. Even if you had the system readjusted to keep
the lights burning for an extended time for coming home, the
external lights will be turned off if you do not open the driver's door
within 60 seconds after unlocking see chapter "Opening and Closing" in your Owner's Manual. If the lights are switched off
before you reach the driver's door, press the
0 button once more to
turn them on again. _,,,