2009 AUDI A4 CABRIOLET check engine light

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•
The brake fluid reservoir is located at the rear partition of the engine
compartment on the left side~
page 252 .
The fluid level may drop slightly after some time due to the auto­
matic adjustment of the brake pads. This is not cause for alarm .
If the brake fluid level falls
considerably below the "MIN" mark, the
brake warning/indicator light (U .S. models :
BRAKE, Canadian models :
(CD) ) wi ll come on
~ page 23 and ~ page 30. Do not continue to
operate the vehicle. The complete brake system should be thor ­
oughly checked by an authorized Audi dealer or qualified workshop
and the cause corrected . If the brake fluid level is too low, the brake
warning/indicator light will illuminate. Contact an authorized Audi
dea ler
immediately .•
Changing brake fluid
Have the brake fluid changed by an experienced techni­
cian.
Brake fluid absorbs moisture from the air . If the water content in the
brake fluid is too high, corrosion in the brake system may result
after a period of time. The boiling point of the brake fluid wil l also
decrease considerably and decrease braking performance.
Therefore, the brake fluid must be changed
every two years. Always
use new brake fluid which conforms to Federa l Motor Vehic le Stan­
dard "FMVSS 116 DOT 4".
The brake fluid reservoir can be difficult to reach, therefore, we
recommend that you have the brake fluid changed by your autho ­
rized
Audi dealer. Your dealer has the correct tools, the right brake
fluid and the know -how to do this for you.
& WARNING
• Brake fluid is poisonous. It must be stored only in the closed
original container out of the reach of children!
& WARNING (continued)
• Brake failure can result from old or inappropriate brake fluid.
Observe these precautions :
- Use only brake fluid that meets SAE specification
J 1703 and
conforms to Federal Motor Vehicle Standard 116. Always check
with your authorized Audi dealer to make sure you are using
the correct brake fluid. The correct type of brake fluid is also
indicated on the brake fluid reservoir .
- The brake fluid must be new . Heavy use of the brakes can
cause a vapor lock if the brake fluid is left in the system too
long. This can seriously affect the efficiency of the brakes as
well as your safety . This could result in an accident.
0 Note
Brake fluid wil l damage the paint of your vehicle .
ci> For the sake of the environment
Because of the problem of proper disposal of brake fluid as well as
the special tools required and the necessary expertise, we recom­
mend that you have the brake fluid changed by your authorized Audi
dealer. •
Battery
General information
Under normal operating conditions, the battery in your Audi does
not need any maintenance. With
high outside temperatures it is
advisab le however to check the fluid level at regular intervals
through the transparent battery housing. Also check the fluid level
each time you charge the battery . After charging the battery
~ page 265, you shou ld likewise check the battery acid level. ...
Vehic le care

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Have the battery checked when you take your vehicle in for service .
You are well advised to replace a battery that is older than 5 years.
Disconnecting the battery terminals
Some vehicle functions (power window regulators, for example) are
lost if the battery terminals are disconnected . Th ese functions have
to be relearned after the battery terminals are connected again. To
prevent this, the battery should only be disconnected from the
vehicle electrical system when absolutely necessary for repairs .
Vehicles not driven for long periods
If you are going to let your vehicle stand for a long time and not
drive it, you should remember there are electrical components
which are still functioning and they will draw energy from the
battery and drain it, for example, the engine immobilizer. To prevent
this, you can either charge the battery occasionally to keep it in
good working condition or you can disconnect the negative cable
on the battery.
Winter operation
During the winter months, battery capacity tends to decrease as
temperatures drop. This is because more power is also consumed
while starting, and the headlights, rear window defogger, etc., are
used more often.
Avoid unnecessary power consumption, particularly in city traffic or
when traveling only short distances . Let your authorized Audi dea ler
check the capacity of the vehicle battery before winter sets in
=>
page 265 . A we ll charged battery wil l not only prevent starting
problems when the weather is cold, but will also last longer.
Replacing battery
The new battery must have the same capacity, voltage (12 volts),
amperage, construction and plug sea ling, as the origina l battery.
Specifications are listed on the battery housing. Batteries specially
developed by Audi fulfill the maintenance, output, and safety
requirements. When installing the battery, make sure the ignition and all electrical
consumers are switched off=>
0.
We recommend that you use maintenance -free or cyc le-resis­
tant/leak-proof
batteries according to the standards TL 825 06 (from
December 1997) and VW 7 50 73 (from August 2001).
Replacing the battery should be carried by a qualified workshop.
Please follow the instructions on the battery cover.
0 Note
• All work on the battery requires technical knowledge. Please
contact an Audi dealership or another authorized facility for ques­
tions about the battery -danger of acid burns and exp losion hazard!
• Make sure the ventilation hose on the side of the battery is
connected, otherwise fumes or battery acid can leak out.
• Battery holder and terminals always have to be secured correctly.
• Before all work on the battery follow the
warnings below=> & in
"Working on the battery" on
page 263.
Because of the problem of proper disposal of a battery, we recom­
mend your authorized Audi dealer change the battery for you.
Batteries contain sulfuric acid and lead and must always be
disposed of properly in compliance with all environmental regula ­
tions . Disposing of vehicle batteries improperly is very dangerous to
the environment . Make sure that the removed battery cannot over ­
balance, otherwise sulfuric acid might escape!
[ i ] Tips
If your vehicle is left standing for several weeks at extremely low
temperatures, the vehicle battery should be removed and stored
where it will not freeze. This will prevent it from being damaged and
having to be replaced.•

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Working on the battery
Be especially careful when working on or near the battery.
•·•·•·•
Fig. 204 Engine
compartment, plenum
chamber : battery cover
Before you check anything in the engine compartment,
always read and heed all WARNINGS=>
& in "Working in
the engine compartment" on
page 250.
Removing the cover
-Push the cover in the direction of the arrow => fig. 204.
Always heed the safety warnings, when working on the vehicle
battery or the vehicle electrical system to prevent injury.
The following WARNINGS are very important when
working on the battery:
Always heed the following WARNING SYMBOLS and safety pre ­
cautions when working on the battery .
®
Always wear eye protection.
Battery acid contains sulfuric acid. Always wear
gloves and eye protection.
No
- sparks
- flames
- smoking.
When a battery is charged, it produces hydrogen
gas which is explosive and could cause personal
injury.
Always keep the battery well out of reach of chil­
dren.
& WARNING
Whenever working on the battery or on the electrical system,
there is the risk of injury, accident and even fire. Read and heed the
following WARNINGS:
• Always wear eye protection. Do not let battery acid or any lead
particles get on your skin or clothing. Shield your eyes. Explosive
gases can cause blindness or other injury.
• Battery acid contains sulfuric acid. Sulfuric acid can cause
blindness and severe burns .
- Always wear gloves and eye protection. Do not tilt the battery because acid could leak out of the ventilation openings .
- If you get battery acid in your eyes or on your skin, immedi ­
ately rinse with cold water for several minutes and get medical
attention.
- If you should ingest any battery acid, seek medical attention
immediately.
• Do not expose the battery to an open flame , electric sparks or
an open light.
• Do not smoke.
• Do not interchange the positive and negative cables .
• When working on the battery, be sure not to short-circuit the
terminals with tools or other metal objects. This would cause the .,,.
Vehic le care irechnical data

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& WARNING (continued )
battery to heat up very q uickly, which could lead to damage or
explo sion and per sonal injury .
• When a battery is charged , it produces hydrogen gas whic h i s
explo sive and could cause per son al injury .
• Always keep the battery well out of the re ach of children.
• Before work i s done on the electrical system , di sconne ct the
negative ground cable .
• Before per forming any work on the ele ctri cal system , switch off
the engine and ignition as well as any electrical equipment. The
negative cable on the battery must be disconnected .
If you are just
going to replace a light bulb , then it is enough to switch off the
light s.
• Before disconnecting the battery , switch off the anti -theft
alarm system! Otherw ise you will set off the alarm .
• When di sconne cting the battery , fir st di sconnect the negative
c able and then the positive cable .
• Before reconnecting the battery , make sure all electrical
c onsumers are sw itched off . Reconnect the posit ive cable first and
then the negative cable. Never interchange the cables -this could
start a fire !
• Never charge a frozen or a thawed -out battery. It could
e xplode! If a battery has frozen , then it must be replaced. A
discharged batte ry can freeze over at 32 °F (0 °C ).
• Make sure the vent hose is always attached to the opening on
the side of the battery.
• Never use batteries which are damaged . There is the danger of
an explosion! Alway s replace a damaged battery.
& WARNING
California Propo sition 65 Warning :
& WARNING (continued )
• Battery post s, terminals and related accessories contain le ad
and lead compounds , chemicals known to the State of California
to cause can cer and reproduct ive problems . Wash hand s after
handling .
0 Note
• Do not disco nnect t he vehicle battery when the igni tion is
switched on or when the engine is running , otherwise, you wi ll
damage e le ctronic c ompone nts in the electrical syst em.
• I f your vehicle is going to stand for a long period of time without
being dr iven, protect the battery from "freezing" otherwise it wil l be
damaged and wi ll then have to be replaced .•
Checking the battery acid level
T he aci d l evel of a co nv enti onal ba ttery c an be c hecke d
vis ually.
·•
Fig . 2 05 Engine
c ompartment : Battery
w it h o pen b atter y
compartment cover
T he leve l of acid inside the b atte ry is vis ib le th rough the
case a t the fo nt. Ac id le ve l shou ld be ex actly at t he " max "
m ark or v ery clo se belo w it.
~

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Windshield /headlight washer
reservoir
Fig . 206 Engine
compartment : wind­
shield washer fluid
container
The windshield and headlight washer* container is located
on the left side of the engine compartment
~ fig. 206. The
~ symbol is on the cap the of the windshield washer fluid
container.
- Before you check anything in the engine compartment,
always
read and heed all WARNINGS~ & in "Working
in the engine compartment" on
page 250.
-Lift the filler cap tongue to add washer fluid. You can fill
the container to the top.
- Press the cap back onto the filler neck after filling the
container .
You can find the reservoir capacity in the table in~ page 314.
To prevent lime residue from building up on the spray jets , use
dis tilled water when refilling . Always add a glass cleaner solution
(with frost protection in the winter).
(D Note
Do not use engine coolant antifreeze or any other solution that can
damage the vehicle paint. •

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& WARNING (continued)
• Before you check anything in the engine compartment, always
read and heed all WARNINGS~ page 242, "Engine compartment".
0 Note
• Applying a higher voltage booster battery will cause expensive
damage to sensitive electronic components, such as control units,
relays, radio, etc .
• There must be no electrical contact between the vehicles as
otherwise current could already start to flow as soon as the positive
(+) terminals are connected.
[ i] Tips
The discharged battery must be properly connected to the vehicle's
electrical system. •
Use of jumper cables
Make sure to connect the jumper cable clamps in exactly
the order described below!
Fig. 225 Jump·
starting with the
battery of another
vehicle : A -discharged
vehicle battery, B -
booster battery
Vehicle with discharged battery:
- Turn off lights and accessories, move lever of automatic
transmission to
N (Neutral) or P (Park) and set parking
brake.
Connect POSITIVE (+) to POSITIVE (+) (red)
1. Connect clamp of plus cable to positive(+) terminal G)
~ fig. 225 of discharged vehicle battery@.
2. Connect clamp on opposite end of cable to positive(+)
terminal
® of booster battery@.
Connect NEGATIVE (-) to NEGATIVE (-) (black)
3. Connect clamp of minus cable (black) to negative( -)
terminal
0 of booster battery@.
4. Connect clamp on opposite end of negative cable to the
negative( -) terminal © of the discharged vehicle battery
@.
- Check that all screw plugs on the battery cells are
screwed in firmly. If not, tighten plugs prior to
connecting clamp on negative battery terminal.
Starting the engine
- Start the engine of the vehicle with the booster battery.
Run the engine at a moderate speed.
- Start engine with discharged vehicle battery in the usual
manner.
- If the engine fails to start: do not keep the starter
cranking for longer than 10 seconds. Wait for about 30
seconds and then try again. .,,.
~ehicle care Do-it-yourse lf service Technical data

ll'JI Alphabetical index _ __,__ ___ ____;_...::.:...::... ___________________________ _
Changing engine oil ...... ... ... .. ... 256
Chassis Undercoating ........ ...... .... .. 237
CHECK button . . . . . . . . . . . . . . . . . . . . . . . 16
Checking Battery acid level . . . . . . . . . . . . . . . . . 264
Engine coolant level .. ............ 258
Checking tire pressure ............... 274
Child restraint Danger of using child restraints in the
front seat . . . . . . . . . . . . . . . . . . . . . . 170
Child restraints What types of chi ld restraint anchors are
available? ..................... 203
Where can I get additional information
about child restraints? ... .... .... 204
Child safety .. ........ ....... ... 190, 195
Booster seats . . . . . . . . . . . . . . . . . . . . 198
Convertible child safety seats . . . . . . 196
Convertible locking retractor . . . . . . . 200
Guidance fixtures for lower anchorages 206
Important safety instructions for using
child safety seats .. ...... ....... 193
Important things to know when driving
with chi ldren ............. ...... 190
Infant seats . . . . . . . . . . . . . . . . . . . . . 195
Installing a child restraint using the
LATCH system .... ... .... ...... . 208
Lower anchorages .... .... ... ... . 205
Mounting and releasing the anchorage
hook ...... ...... .... .......... 209
O lder children and safety belts ... .. 199 Safety belts and oldler children
... .. 199
Which restraint system should my older chi ld wear? ........ .... ... .. ... 199
child safety seat LATCH system . .... .... .... ...... 208
Childsafetyseats .... ........ .... ... 195
Convertible locking retractor .... ... 200
How do I properly install a child safety seat in my vehicle? .. ...... .... .. 193
Installing .... .... ... .. .... .... .. 200
Safety instructions .............. .
Cigarette lighter .......... .... ..... .
Cleaning Alcantara (synthetic suede) ....... .
E . ngine compartment . .... ... .. .. .
Fabrics and fabric coverings ... ... .
Instrument panel ....... .... ..... . 193
105
241
242
238
239
I . ntenor ......................... 238
Leather .... ...... ... .. .... ...... 240
Plastic and vinyl . .... .... ... .. ... 234
P lastic parts ........... .... ... ... 239
Safety be lts ...... ............ ... 242
Trim strips ............. ... .... .. 234
trim strips ... .. ...... .... ..... ... 235
Cleaning and protection .......... ... 230
Climate controls .. .... ......... ..... 11
O
Air distribution . . . . . . . . . . . . . . . . . . 114
Air outlets . . . . . . . . . . . . . . . . . . . . . . . 115
Air recirculation .... .... .... .... .. 113
AUTO (standard setting) .... .... ... 112
Automatic air recirculation ... .. ... 114
Contro ls . . . . . . . . . . . . . . . . . . . . . . . . 111
Defrosting / Defogging . . . . . . . . . . . . 116
Description . . . . . . . . . . . . . . . . . . . . . . 11
O
ECON ... .. .. .. .... .... ..... .. ... 113
Fan .. ............ .... ... .... ... 114
Key coded setting ................ 11
O
Recommended settings ........... 11 O
Setting the temperature ........... 112
Switching between Fahrenheit and Centigrade ... .... .... ...... .... 113
Switching the air conditioning on or off .
113
Using the climate control economically . .
116
Warm and cold .................. 110
Clock .. ........... ........... .... ... 14
Closing Power top . . . . . . . . . . . . . . . . . . . . . . . . 62
Cold tire inflation pressure .. .... ..... 271
Coming -home -function .. ............. 80
Compartments in the door trims ... ... 109
Compass mirror .. .... ...... ... ..... . 90
Comp liance .......... ....... .... ... 320
Consumer Information ........... 155, 316
Contacting NHTSA .................. 155
Continuously Variable Transmission (CVT)
See multitronic® ........ ... ...... 131
Convenience close/open feature Power top . . . . . . . . . . . . . . . . . . . . . . . . 63
Windows ......................... 53
Convertible child seats How do I properly install a convertib le
chi ld seat in my vehic le? ...... ... 196
Safety instructions .. ...... .... ... 196

IIPJI Alphabetical index _ __,__ ___ ____;_...::.:...::... ___________________________ _
Hood ...... ... ...... .. ... .. .. ... 249
Starting .. .... .... ....... ... 119,120
Starting with jumper cables ....... 304
Stopping . . . . . . . . . . . . . . . . . . . . . . .
120
Engine compartment
Safety instructions . . . . . . . . . . . . . . .
250
Working in the engine compartment 250
Engine coolant .................. ... 258
Checking the engine coo lant level .. 258
Malfunction warning symbol ... ..... 31
Engine coolant level
Checking ... .. .... .... ..........
258
E . I
ngine coo ant system ... .... ....... 257
Adding coolant .................. 259
Radiator fan . . . . . . . . . . . . . . . . . . . . . 260
Engine coolant temperature
Temperature gauge ....... .... ....
13
Engine data ...... ............... ... 314
Engine hood Closing ... .... ... .... .... ...... .
250
How to release the hood . . . . . . . . . . 249
Opening .. .... .... ....... .... ... 249
Engine oil ... ... .... .... .... ... .... 252
Adding ... .. ...... ... .... ...... . 255
Additives . . . . . . . . . . . . . . . . . . . . . . . 255
Changing . .............. ........ 256
Checking the engine oil level ...... . 254
Indications and conditions requiring extra
checking .... .... ....... .... ...
254
Indicator light . . . . . . . . . . . . . . . . . . . . 33
Oil capacity . . . . . . . . . . . . . . . . . . . . .
314
Oil consumption ................. 254
Oil grades . . . . . . . . . . . . . . . . . . . . . . . 252
Recommended oil check intervals .. 254
Sensor defective . . . . . . . . . . . . . . . . . . 33
Specification and viscosity ...... ..
252
Engine oil pressure
Malfunction .. ....... ..... ... .... . 32
Environment Break -in period .... .... .... .... ..
219
Catalytic converter .... .... .... ... 220
Disposing of your vehic le battery ...
262
Driving at high speeds ...... .... .. 221
Driving to minimize pollution and noise .
221
Fuel ......... .... ... .. .... .... .. 246
Fuel economy ....... ...... ...... 221
Leaks under your vehicle . ...... ... 250
Letting the vehicle stand and warm up
222
Proper disposa l of drained brake fluid
261
Proper disposal of drained engine
coo lant ..................... ...
259
Proper disposa l of drained engine oil
255,256
Recycling used eng ine oil ......... 255
Unleaded fuel ... .... ..... .... ... 244
What should I do with an old battery?
262
EPC
See Electronic power control .. ... .. . 22
ESP Electronic stabi lization program ....
212
See also Electronic stabilization program
(ESP) . ... .... .... ........ ......
212
Event Data Recorder (EDR) .. ....... .. 212
Expansion tank .. .. .. .. .. .... .... ... 258
F
Fahrenheit
Switching between Fahrenheit and Centigrade ... .... ..............
113
Fan
Climate controls ... ....... .... ...
114
Radiator ...... .... ........... ... 260
Setting the fan speed 114
Flat tire
Changing .. .... .... ............. 293
Floor mats
Fog lights
153
Front ....... ...... .... ........ ... 79
Folding master key with remote control . 47
Foot pedals . ... .. .... .... .... ...... 152
For the sake of the environment
Gaso line fumes and the environment
246
Letting your engine warm up ....... 120
Reducing engine noise by early
upshifting ......................
13
Refueling ......... ...... ........ 246
Saving fuel by early upshifting . ..... 13
Using the rear window defogger ....
116
Front airbags
Description ......................
172
How they work ..... .... ....... ... 177
Front ashtray . . . . . . . . . . . . . . . . . . . . . . . 104
Front seat adjustment
Safety guide lines .................. 92