2009 AUDI A4 CABRIOLET sensor

Instrument cluster illumination
It is possible to adjust the instrument cluster illumination.
9:36
02 .11.200
Fig. 4 In strum ent
c lus ter illum inat io n
- Press the"+" button to increase the brightness.
Press the"-" button to dim the br ightness.
A light sensor in the instrument cluster controls the illumination for
the instrument cluster, the center conso le and the displays.
The illumination for the instrument cluster lights up whenever you switch on the ignition with the
ve hic le head lights off. As the
daylight fades, the instrument c luster illumination likewise dims
automatically and wi ll go out complete 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 eq uip­
ment
In st ru m ent s a nd 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 .
0 1mUc::1 Uni3
Fi g. 5 Odome ter
di sp la y in side s pee d­
o m eter
The odometer and trip odometer are located inside the speedom ­
eter.
• USA models - Miles
• Canada models - Ki lometers
Lo wer odomet er
The lower odometer shows the tota l number of miles (ki lometers)
driven.
Upp er odom ete r (t rip odo m ete r)
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 mile (100 meters). You can set the trip odometer back
to zero by pressing the reset button
~ fig. 5. _,.
~ehicle care Technical data

Inst rum ents and warnin g/indi cato r li ghts
If one of the turn signal light bulbs burn out, the turn signal will
flash twice as fast as normal. •
Electronic Stabilization Program (ESP)
The warning/indicator light monitors the electronic stabi­
lization program.
The warning/indicator light has the following 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 function 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 of the ABS system.
If the ESP warning/indicator light i lluminates and stays on after you
have started the engine , this may mean that the control system has
temporari ly switched off the ESP. If this is case, you can reactivate
the ESP by switching the ignition o ff and then on again. The
warning/indicator light should go out to show that the system is
fully functional again.
If 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 process for the first few yards.
During this time, the indicator light illuminates. It goes out as soon
as the learning process is comp lete .
For more information about the ESP~
page 22. •
Generator 0
T his warning/indicator light detects a malfunction in the
generator or in the vehicle's electrical system .
The D warning/indicator light illuminates when you switch on the
ign itio n and must go out after the engine has started.
If the
D warning/indicator light illuminates while you are driving,
you shou ld contact your authorized Audi dealer . Since the vehicle
battery is discharging, you should switch off any unnecessary elec ­
trical consumers (for example, the air conditioner) .
0 Note
If the -t warning/indicator light (ma lfunction in the engine coo ling
system) in the instrument cluster shou ld illuminate~
page 31, stop
the vehicle and turn off the engine. The coo lant pump is not working
- this can cause engine damage! •
High beam ~D
The@:Dwarning/indicator light illuminates when the high beams are
on or when you use the headlight flasher. For more information
about using the high beams, see~
page 83. •
Electronic power control p
This warning/indi cator light monitors the electronic
power control.
The warning/indicator light (Electronic Power Control) il lumi-
nates when you switch on the ignition as a function check .

Driver information display
Engine oil pressure malfunction 9=7-
The red engine oil pressure warning symbol requires
immediate service or repair. Driving with a low-oil-pres­
sure indication is likely to inflict severe damage to the engine.
If the ~ symbol appears in the display and blinks, the oil
pressure is too low. An additional driver message can also
be displayed by pressing the [CHECK] button:
Switch off engine and check oil level
Immediate actions
- Pull off the road.
- Stop the vehicle.
Turn off the engine.
- Check the engine oil level with the dipstick=> page 254.
Dipstick readings checks too low
-Top off oil to the proper level => page 255 .
- Make sure that the oil pressure warning symbol
~
appears no longer in the display before you start driving
again.
Dipstick reading checks OK
- If the oil pressure warning symbol~ starts flashing
again even though the engine oil level checks
OK on the
dipstick,
do not continue driving and do not let the
engine run in idle.
Instead, contact your authorized Audi
dealer for assistance.
[ i ] Tips
• The engine oil pressure symbol 'l::::r. 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 intervals, 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 pres­
sure warning
'l::::r. starts to flash before you respond to the low oil
level warning . By then, your engine may already have suffered
serious damage. •
Yellow symbols
A yellow symbol means WARNING.
Yellow symbols mean:
Low fuel level
Check engine oil level
i :c
"' "'
Engine oil sensor malfunction
Fig. 18 Display: low
fuel level warning
(priority 2)
=> page 33
~ page33
=> page 33

II
Light/rain* sensor defective
Worn brake pads
USA m odels :
Speed warning 1
Canad a m od els:
Speed warning 1
Dynamic headlight range con trol*
defective
Adaptive Light* defective
Windshield washer fluid level low
U SA mod els:
Speed warning 2
Canada mod els:
Speed warning 2
Battery voltage too high or too low
D efective light bu lb
Tire pressure monitoring system* Loss of air pressure
Tire pressure monitoring system*
System not available
~ page33
~ page 33
~ page34
~ page 34
~ page34
~ page34
~ page34
~ page 34
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~ page 34
~ page35
~ page 43
~ page46 I
Ye llow symbols indicate a priority 2 malfunction -Warning!
When a yellow symbo l appears, a warning tone wi ll sound
once.
Check the displayed function as soon as possible. If more than one
priority 2 ma lfunction is detected, all symbols will appear one after
the other for about two seconds. •
Controls and equip­
ment
Driv er inf ormati on di spl ay
Fuel supply too low l
When the -,symbol illuminates, this means there is about 2 to 2.5
gallons (8 to 10 litres) of fue l left in the fuel tank . Time to refuel!
~ page 245. •
Engine oil level '7.:.
When the-=· symbol illuminates, check the engine oil level as soon
as possib le ~
page 254 . Add oil if necessary ~ page 255. •
Engine oil sensor defective • ..
If the .,_,ft symbol illuminates, contact your author ized Audi dea ler
and have the oil sensor inspected. Until you have this done, check
the oi l leve l each time you refuel just to be on the safe side
~ page 254. •
Applies to vehic les: with Lighting package
Light/rain* sensor defective >
- Automa tic headl ight s/autom atic wiper s def ective
If the symbol il luminates, the light/rain sensor has failed. For safety
reasons the low beams are turned on permanently with the switch
in
AUTO . However, you can continue to turn the lights on and off
using the light switch. In the case of a defect in the rain sensor, the
windsh ield wiper lever functions are still avai lable. Have the
light/rain sensor checked as soon as possible at a dealership. •
Worn brake pads J
r Brake p ad s!

Driver information display
symbols appear in the instrument cluster display to alert the driver.
The warning light in the instrument cluster comes on when the
tire is significantly underinflated .
The warning light _, also lights up during a system failure.
When the wheel is turning, the system receives radio signals from
sensors located inside each tire .
A factory spare wheel is delivered with sensor. However, the spare
wheel is not checked by the tire pressure monitoring system. Such monitoring can only occur after the spare wheel has been installed
and initialized ~
page 45.
Be aware that tire pressure is also dependent on the temperature of
the tire. For every 18 °F (10 °C) increase in tire temperature, tire pres­
sure increases by about 1.5 psi (0.1 bar). The tire warms up while the
vehicle is moving and tire pressure rises. So you should adjust tire
pressure only when they are
cold, when tire temperature is roughly
the same as ambient air temperature.
In order to keep the tire pressure monitoring system properly cali­
brated, tire pressure on all four tires should be checked at regular
intervals, adjusted if necessary and saved in the proper setting
(recommended pressure)~
page 43.
The tire pressure is shown on the tire pressure label. On USA vehi ­
cles, the tire pressure label is located on the driver's side B-pillar. On
Canada vehicles, the tire pressure label is located either on the
driver's side B-pillar or inside the fuel filler flap. The tire pressure
label lists the recommended cold tire inflation pressures for the
vehicle at its maximum capacity weight and the tires that were on
your vehicle at the time it was manufactured . For recommended tire
pressures for normal load conditions, please see chapter
~ page 277.
& WARNING
• When the tire pressure monitoring system warning light is lit,
one or more of your tires is significantly under -inflated. You should
stop and check your tires as soon as possible, and inflate them to
& WARNING (continued)
the proper pressure as indicated on the vehicle's tire pressure
label
~ page 271. Driving on a significantly under-inflated tire
causes the tire 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 pressure when tire temperature is excessive.
This could lead to serious tire damage and even cause the tire to
burst, with the additional danger of an accident.
For the sake of the environment
Driving with under-inflated tires reduces fuel efficiency and tire
tread life.
[ i] Tips
• Each tire should be checked monthly when cold and set to the
recommended inflation pressure as specified on the tire pressure
table~
page 277 .
• The tire pressure monitoring system helps the driver to keep
track of the tire pressures . But the driver still has the responsibility
for maintaining the correct tire pressure.
• Tire pressure must only be adjusted when the temperature of the
tires is about the same as ambient air temperature.
• When tires are replaced, the sensors and valves must not be
detached or exchanged. Only the valve core needs to be replaced
and, if necessary, the valve and the wheel electronics replaced.
• If you should put different wheels and tires on your vehicle (e.g.
winter wheels and tires), you must be certain that the wheels and
tires are compatible with the tire pressure monitoring system.
Otherwise the system will register a malfunction and a fault
message will be displayed. For more information, contact your Audi
dealer. .,