2009 AUDI A4 CABRIOLET check engine

Power windows
Controls
Fig. 50 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 door.
Switches for rear windows
© operates the left rear window.
@ operates the right rear window.
Switches for all windows
© operates all windows .
& WARNING
• Do not leave children unattended in the vehicle, especially with
access to vehicle keys. Unsupervised use of the keys can result in
Contro ls and eq uip­
ment
Opening and closing
& WARNING (continued)
starting of the engine and use of vehicle systems such as power
windows, etc. which could result in serious injury.
• Remember -you can still open or close the power windows for
about ten minutes after the ignition is switched off. Only when
either of the front doors are opened are the power windows
switched off.
• Be careful when closing the windows . Check to see that no one
is in the way, or serious injury could result!
• Always remove the ignition key whenever you leave your
vehicle.
• If you lock your vehicle from the outside, no one, especially
chil­
dren, should remain in the vehicle even when the power top is
opened.
• Do not stick anything on the windows or the windshield that
may interfere with the driver's field of vision. •
Switches in the driver's door
The driver can operate all windows.
If the respect ive switch is pushed or pulled the windo w will
open or close . The power w indow switches have a
two-posi­
tion function:
Opening the windows
Push the switch to the first stop and hold it there until the
window has lowered to the desired position.
Push the switch briefly to the
second stop: the window
will automatically open all the way. ..
~ehicle care Technical data

Clear vision
inst rument panel ill umination will automaticall y become dimmer
a s the daylight fades away and eventually will go out completely
when out side l ight i s very low . Thi s is to remind you , the dri ver , to
s witch on the headlights befor e it g ets too dark.
• Canada model s: instrument panel illumination will stay bright
re gardles s of the intensity of ambient light . Alway s be aware of
c hange s in outside light cond itions while you are d riv ing . Resp ond
in time to f ading dayl ight by turning the ligh t switch to po sit ion
io
(or "AUTO" if your car is equipped with this feature) to turn on your
he adl ights . •
Ap plie s to vehic le s: wi th x eno n hea dlig ht s
Xenon headlights
After s tarting the engine, the xenon headligh ts are automatically
adjusted to the load and angle of the vehicle (for example, during
acce leration and brak ing) . This prevents oncoming tra ffic from
experienc ing unnecessa ry glare from your head lights .
If the system is not operating properly, a warning sy mbol in the
Auto -Check Contro l is displayed:::::,
page 34. •
Emergency flasher &.
The emergency flasher makes other mot orists aw are that
y o u or your vehicle are in an emergency situation.
1Jia---------------...,i ij ::c .,
"'
-
Fig. 9 3 Ce nter
cons ole: e mergen cy
fla sher swit ch
Press the sw itch ~~fig . 93, to sw itch the emergency
fl ash er o n or o ff.
When the emergency flasher is on, al l four turn signa l blink at the
same time . The turn signal indicator lights¢¢ in the instrument
cluster, as we ll as the light in the emergency flasher sw itch
t!:;,,. b link
likewise .
The emergency flasher will automatica lly switch on if you are in an
accident where the airbag has deployed .
[ i ] Tips
You should switch on the emergency flasher when :
• you are the last vehicle stand ing in a t raffic jam so that any other
veh ic les coming can see you , or when
• your vehic le has broken down or you are in an emergency situa ­
tion, or when
• your veh ic le is being towed by a tow truck or if you are towing
another vehicle behind you .•

Clear vision
& WARNING
• Wiper blade s are cru cial fo r safe driving ! O nly when they are in
good cond it ion are they able to clear the window s properly to
p ro vi de un comp romi sed vis ibility . Worn or damaged wiper blade s
are a safety hazard
=> page 8 7, "In stalling new w ipe r blades "!
• The rain sen sor is onl y de signed to a ssis t and support the
driver. It remain s ent irely the driver' s re spon sibility to monitor
o ut side weather condit ion s a nd to manually acti vate the wipers a s
soon a s rain or drizzle reduces vi sibility through the wind shield .
• The wind shield mu st not be treat ed w ith water -repellent mate ­
rials. They can increase glare under poor visibility conditions such
a s w etne ss, darknes s, or when the sun i s lo w on t he horizon . In
addition , they can cause the windshield wipers to chatter .
0 Note
In freezing or near freezing conditions :
• Always check that the wiper blades are not frozen to the g lass
before you turn the wipers on. Loosen a wiper b lade which is frozen
in place before operating the wipers to prevent damage to the wiper
b lade or the wipe r motor.
• Do not use the wipers to clear a frosted window . Using the
wipe rs as a convenient ice scraper wil l destroy the wiper blades .
• Before you take your vehicle to an automatic car wash , make sure
you have the wi ndshield w iper system switched off (lever in position
0), otherwise the windshield wiper system could get damaged in the
car wash if it should suddenly come on .
[ i ] Tips
• The rain sensor is part of the interva l wiping system . Turning off
the ignition will also deactivate the rain sensor. To reactivate the sensor, switch off the interva l wiping function, then switch it back
on aga in. • I
f you switch off the ignition with the windshield wiper lever sti ll
in the interva l wipe position and then come back a while late r and
drive off, the rain sensor will reactivate itself after the vehicle speed
has exceeded 4 mph (6 km/h) .
• Worn or dirty windshield wiper b lades cause smearing which
can affect the operation of the rain sensor . Check the condition of
your windshield wiper b lades regularly .
• Make sure the washer fluid reservoir in the engine co mpartment
is topped off before going on a long trip. Look up=>
page 266 for
checking and f illing the washer container .•
Headlight washer system
The headlight washer system cleans the headlights.
Operate the w indshie ld wiper/washer system, leve r posi­
tion
© =>page 85, fig. 97, w ith the head lig hts switched
on
by h old ing the lever for longer than o ne second .
The washer jets extend forward out of the front bumper driven by
water pressure to s pray the front headlights with water .
You should inspec t the head lights regu larly (for examp le when refu ­
e ling) and c lean off any so lid dirt or insects from the lenses .
To ensure the sys tem works proper ly in winter, keep the washer jets
free of snow and
remove any ice using a de -icing spray .•

_______________________________________________________ T_ ra_ n_s_ m __ is_s_ io_ n ____ !II
The se lector lever must be in Nor P. If one of the driving positions
is engaged a safety switch w ill preven t the eng ine from being
started. See also=> page 120 .
Before you move the selector lever from the P position, you must
a lways apply the brake peda l before and wh ile de press ing the
button in the hand le of the selector lever.
& WARNING
• Unintended vehicle movement can cause serious injury .
- When the selector lever is in a driving position , the vehicle
may creep , even at idle speed . Therefore do not release the
parking brake or foot brake until you are ready to move,
because power is transmitted to the wheels as soon as a
driving position is engaged.
- Do not accelerate while selecting a driving position . At this
time the engine must be at idle speed so that undue stress is
not placed on the clutches in the transmission .
- Remember: -even when stopped briefly with the automatic
transmission in "D ", "S " or "R ", engine power is being trans­
mitted to the wheels. Your vehicle could "creep" forward or
ba ckward . When stopped , keep the brake pedal fully depressed
and use the parking brake if necessary to keep the vehicle from
rolling .
• If the selector lever is unintentionally moved into N while you
are driving , take your foot off the accelerator pedal and wait for
the engine to return to idle speed before selecting a driving posi ­
tion .
• Never shift into "R " or "P " when the vehicle is in motion .
• Never get out of the driver 's seat when the engine is running .
• If you must get out of the vehicle , move the selector lever
securely into the P pos ition and apply the parking brake firmly .
• If the engine must remain running , never have any dr iving posi ­
tion engaged when checking under the hood . Make sure the
selector lever has securely engaged and is locked in "P " with the
Controls and equip ­
ment
& W ARNING (continued )
park ing brake firmly set=> page 242, "Engine compartment ".
Otherwi se , any increase in engine speed may set the vehi cle in
motion , even w ith the parking brake appl ied . •
App lies to veh icles: wi th 6-speed automatic transm ission
Selector lever positions
T his sec tion d escri be s th e sel ector le ver po sitio ns an d
d ri vin g rang es.
Fig. 140 D ispl ay in the
in strument c luster:
se lector lever in posi­
tion D
The se lecto r lev er p ositi on engage d ap pears next to t he se lec to r
leve r as well as in the instrument cluster display .
P -Park
In this selecto r lever position the transmission is mechanica lly
l oc ked. Engage P only whe n th e ve hicle is completely stopped=>
&
in "Dr iving the automatic transmission" on page 126.
To shift in or out o f po sition P, yo u m ust firs t pr ess an d hol d th e
brake pedal and then press the re lease button in the se lector lever
handle w hile mov ing the se lector leve r to or from P. Yo u can shif t
out o f this pos it io n onl y wit h th e i gn it ion on. _..,

Braking
General information
What affects braking efficiency?
O pera tin g co ndition s and drivi ng h abit s
The brakes on today's automobiles are still subject to wear,
depending large ly on operating conditions and dr iving habits~
&­
On vehicles that are either driven mostly in stop -and -go city traffic
or are driven hard, the brake pads shou ld be checked by your autho­
rized Audi dealer more often than specified in the
W arr anty & Main ­
t e nanc e bo okle t.
Fai lure to have you r brake pads inspec ted ca n
resu lt in reduced brake performance.
On steep slopes, you shou ld use the braking effect of the engine.
This way, you prevent unnecessary wear on the brake system. If you must use your brakes, do not hold the brakes down continuous ly.
Pump the brakes at intervals.
Moi sture or road salt
If you are driv ing faster than 50 mph (80 km/h) and the windshie ld
wipers are on, the brake pads wi ll briefly touch the brake discs in
regu lar intervals so as to improve reaction time when braking on
wet surfaces. You, the driver, wil l not notice anything.
Under ce rta in conditions, for example, when dr iving through water
or very heavy rain, or even after washing your vehicle, the braking
effect can be reduced due to moisture (or in freezing conditions ice)
on the brake pads. A few cautious brake applications should dry off
the b rake pads or remove any ice coatings .
At speeds
over80 km/h and with the windshie ld wiper turned on, the
brake pads are app lied briefly to the brake discs. This occurs at
regu lar interva ls wi thout the driver not icing and provides for better
brake response time under wet conditions.
The effectiveness of the brakes can be reduced when the vehicle is driven on a sa lt-covered road and the brakes are not used. Likewise,
Controls and equip­
ment Safety first Vehicle operation
Int
ellig ent tec hnol ogy
you clean off accumulated sa lt coating from brake discs and pads
with a few ca utious applications of the brake ~
&-
Cor rosi on
There may be a tendency for dirt to build up on the brake pads and
corrosion to form on the discs if the car is not driven regularly or
only f or sho rt trips with little use of the brakes.
If the brakes are not used frequently, or if corrosion has formed on
the discs, it is advisable to clean off the pads and discs by braking
firm ly a few times from a moderately high speed~
&-
Fa ults in the brake system
If you shou ld notice a sudden increase in brake pedal trave l, then
one of the two brake circuits may have failed~
&-
Lo w brak e fluid l evel
Malfunctions can occur in the brake system i f the brake fluid level is
too low . The brake fluid level is monitored electronically .
Brake lining wear statu s
Brake lining wear may be checked by visua l inspection of the condi ­
tion o f the brake pads through the open ings in the wheel. If neces­
sary, the wheel may be removed for this inspection
~ page 293,
"Whee l change".
& WARNING
• You should perform braking maneuver s for the purpo se of
cl eani ng th e br ake sy stem onl y if ro ad condition s permit . Other
road u se rs mu st not be put a t ris k -you may cau se an accident!
• Before des cending a steep gr ade , reduce sp eed and sh ift tr ans ­
mi ssion into a lower gear or lower driving po sition . Do not ride the
brake s or hold the pedal d ow n too long or t oo often . This could
cau se the brake s to get hot and dimini sh brakin g efficien cy . _.
Vehicle care Do-it-yourself service Technical data

___ ln_ te_ ll..,,ig ..,_ e_ n_t _t_ e_ c_ h _ n_o _ l_o _,.g= y,_ __________________________________________ _
& WARNING (continued)
• Do not "ride the brakes" by resting your foot on the pedal when
you do not intend to brake. This may cause the brakes to overheat, premature wear and increased stopping distance.
• Under certain climatic and operating conditions such as
passing through water, driving in heavy rain or after washing the
vehicle, the effectiveness of the brakes can be reduced. In winter,
ice can accumulate on the brake pads, linings, discs and drums .
Cautiously apply brakes for a test. Brakes will dry and ice coatings
will be cleaned off after a few cautious brake applications .
• Driving for an extended period of time on salt-covered roads
without using your brakes can also affect braking efficiency. Clean
off accumulated salt coating from brake discs and pads with a few
cautious brake applications.
• If you damage the front spoiler, or if you install a different
spoiler, be sure the air flow to the front brakes is not obstructed.
Otherwise the brake system could overheat reducing the effective ­
ness of the entire brake system.
• Failure of one brake circuit will impair the braking capability
resulting in an increased stopping distance. Avoid driving the
vehicle and have it towed to the nearest Audi dealer or qualified
workshop. u
Brake booster
The brake booster adds extra braking power.
The brake booster works with vacuum pressure which is created
only when the engine is running~ &.
& WARNING
• Never let the vehicle roll to a stop with the engine shut off.
• If the brake booster is not working, for example when towing
your vehicle, or because the brake booster has somehow been
& WARNING (continued)
damaged, the brake pedal must be pressed considerably harder to
make up for the lack of booster assistance. •
Functioning of Anti-Lock Brake System (ABS)
ABS prevents the wheels from locking up under braking.
The ABS contributes effectively to vehicle control since it prevents
the wheels from
locking when the brakes are applied. This means
that the vehicle remains steerable and is less likely to skid.
With ABS you do not need to pump the brake. Just hold the brake
pedal down.
However , do not expect that the ABS shortens braking distance
under
all circumstances. When driving on gravel or on newly fallen
snow on top of icy surfaces, braking distance may be even longer,
therefore, under these circumstances, it is especially important that
you drive slowly and with great care.
How the ABS system works
An automatic check is made when a speed of about 4 mph (6 km/h)
is reached. When this happens, a pumping noise can be heard.
If an individual wheel begins to rotate too slowly in relation to
vehicle speed and tends to lock, the ABS automatically reduces brake pressure to prevent that wheel from locking.
This automatic adjustment process will cause a
slight vibration of
the brake pedal and some noises to alert you that vehicle speed
must be adapted to existing road and traffic conditions.
& WARNING
Although the ABS is very effective, always remember that braking
capability is limited by tire traction . Always adjust your driving
speed according to the road and traffic conditions. Do not let the .,_

& WARNING (c ont in u ed)
ext ra sa fe ty a fforded by the ABS tempt you into t ak in g ex tr a risks .
The ABS cannot overco me th e law s of ph ysics.
[ i J Tips
• If ABS is not funct ioning properly, a warning light will come on.
See
=> page 20.
• If a fau lt occurs in the ABS, the EDL is also not funct ion ing . This
is indicated by the ABS warning light.
Brake assistant
T he brake assistant is designed to achieve the optimum
braking effect.
The brake assistant helps to increase the effective braking power
and thus to achieve a shorter stopping distance . If the driver
presses the brake pedal very quick ly, the brake assistant automati ­
cally boosts the braking force to the maximum level, up to the point
where the anti -lock brake function (ABS) intervenes to stop the
wheels from locking. You should then keep the brake pedal pressed until the vehicle has braked to the required speed. The brake assis­
tant switches itself off as soon as you re lease the brake peda l.
The brake assistant will not be operative if there is a malfunction in
the ABS .
& WARNING
Please remembe r that the accident risk always in cre a se s if you
dri ve to o fa st, e spe cially in cor ner s o r on a slipp ery road , or if you
follow th e vehicle ahead of you too clos ely. An increased a ccident
ri sk ca nnot be comp en sa ted even b y the brake assista nt , s o
alwa ys maintain a safe spe ed . •
Controls and equip­ ment Safety first Vehicle operation
Int
ellig ent tec hnol ogy
Servotronic® -advanced power
steering system
The power steering systems uses the power of the
running engine to allow precise steering with little effort.
The advanced Servotronic ® power steering system senses the road
speed and electronically adjusts power assistance to provide
comfortab le and safe steering response exactly matched to the
vehicle speed.
Power steering will not work if the engine is off. As a result, the
steering whee l wil l be hard to turn .
The power steering fluid level is checked during the schedu led
maintenance services.
0 Note
If there is an electronic ma lfunction, servotronic will still function
like a conventional power steer ing system, providing a constant
steering support force that is no longer proportionate to the vehicle
speed. This is most noticeable when tu rning the steering whee l at
low speeds (for examp le when parking), -more effort wil l be
requi red than usual.
• Be aware of the different than usual steering response and
adjust you r steering force accordingly .
• Have the problem checked and set right by an Audi dealer as
soon as possible .
[ i J Tips
• When the engi ne is running, never hold the steering whee l
turned all the way to the right or to the left for longer than 15
seconds. The power steering pu mp will overheat the hydraulic fluid
if you keep holding the steering wheel turned a ll the way. This is
likely to damage the power stee ring system.
~
Vehicle care Do-it-yourself service Technical data

___ T_ r _a_ il_e _r_ t_ o_ vv_ in__... g,_ __________________________________________________ _
Trailer towing
Driving with a trailer
General information
Your Audi was designed primarily for passenger transpor­
tation.
If you plan to tow a trailer, please remember that the additional load
will affect durability, economy and performance.
Trailer towing not on ly p laces more stress on the vehicle, it a lso calls
for more concentration from the driver.
For this reasons, always fo llow the operating and driving instruc ­
tions provided and use common sense. •
Technical requirements
Trailer hitch
Use a weight -carrying hitch conforming to the gross trailer weight.
The hitch must be suitab le for your veh ic le and tra iler and must be
mounted securely on the vehicle's chass is at a technically sound
l ocation. Use only a trailer hitch with removable bal l mount. A lways
check with the trailer hitch manufacturer to make sure that you are
using the correct hitch .
Do not u se a bumper hit ch .
The hitch must be installed in such a way that it does not interfere
with the impact-absorbing bumper system . No modifications
should be made to the vehicle exhaust and brake systems . From
time to time, check that all hitch mount ing bo lts re main securely
fastened.
When you are not towing a trai ler, remove the trailer hitch ball
mount. This prevents the hitch from causing damage shou ld your
vehic le be struck from behind
=:, & .
Tire pre ssur e
When towing a trailer, inflate the tires of your vehic le to the cold tire
pressure listed under "Full load"on the s ticker on the right door ­
jamb . Inflate trai ler tires to trai ler and tire manufacturers' specifica ­
tions.
Lights
The head ligh t sett ings should be checked with the trai ler attached
before driving off. Have the head lights adjusted as necessary so
that you can see the road ahead but not blind oncoming traffic.
Check to make sure both vehicle and trailer lights are working prop ­
erly .
Engine cooling sy stem
Towing a trailer makes the engine work harder. It is important tha t
the cooling system's performance stands up to the additional
strain. Make sure that the coo ling sys tem has enough fluid .
Trailer brakes
If your traile r is equipped wi th a braking system, check to be sure
that it conforms to all regu lations .
The trailer hydraul ic brake system must not be direct ly connected to
the vehic le's hydraulic brake system .
Safety chains
Be sure trailer safety chains are properly connected from the trai ler
to the hitch on the vehicle. Leave enough slack in the chains to
permit turning corners. When you install safety chains, make sure
they will not drag on the road when you are driving.
The chains shou ld cross under the trailer tongue to prevent it from
dropping in case of separation from the hitch.
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