2011 AUDI A5 CABRIOLET check engine

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in. WARNING
The cooling system is under pressure and can get very hot. Reduce
the ri sk of scalding from hot coolant by following the se steps .
• Tu rn off the engine and allow it to cool down .
• Protect your face, hands and arms from e scaping fluid and
steam by covering the cap with a large , thick rag.
• Turn the cap slowly and very c arefully in a counter-clockwise
direction while applying light , downward pressure on the top of
the cap.
• To avoid being burned, do not spill antifreeze or coolant on the
exhaust system or hot engine parts. Under certain conditions, the
ethylene glycol in engine coolant can catch fire.
0 Note
Do not add any type of radiator leak sealant to yo ur vehicle 's engine
coo lant. Adding radiator repair fluid may adverse ly affect the func­
tion and performance of your cooling system and could result in
damage no t c ove red by y our New Vehi cle Limited Warr anty. •
Adding coolant
Be very careful when adding engine coolant.
Before you check anyt hing in th e eng ine compartment ,
always read and heed all WARNINGS=> & in "Wor king i n
t h e e ngine compa rtment" on page
280.
-Tur n off the e ng ine.
- Let t he engi ne co ol d ow n.
- Place a t hick rag over the coolant expans ion tank
=> page 2 87, fig . 223 a nd carefully turn the ca p cou nte r­
clo ckwise
=> & .
- Add coo lant .
- Tw ist t he cap o n agai n
tightly.
Replacement eng ine coolant must conform to exact specificat ions
~ page 28 6, "Coolant" . Even in an emergency, if coolant a dditive
Gl2 ++, Gl2+ or Gl2 is not available, do not use a d ifferent add it ive.
Use plain water instead until you can get the correct additive a nd can
restore the co rrect ra tio. This s hould be done as soon as possib le.
If you have lost a considerable amount of coolant, then you shou ld
add co ld a ntifree ze and cold wa ter only when t he e ngine is cold.
Always use
new engine coo lant when refilling .
Do not fill coolant above the "M AX" mark. Excess coo lant wi ll be
for ced out through t he p ress ure relief va lve in t he cap w hen the
eng ine becomes hot .
& WARNING
• The cooling system is under pressure and can get very hot.
Reduce the risk of scalding from hot coolant by following these
steps.
-Turn off the engine and allow it to cool down.
- Protect your face , hands and arms from escaping fluid and
s team by covering the cap with a large, thi ck rag.
- Turn the cap slowly and very carefully
in a counter-clockwise
direction while applying light , downward pre ssure on the top
of the cap.
- To avoid being burned, do not spill ant ifreeze or coolant on
the exhaust system or hot engine parts. Under certain condi­
tions, the ethylene glycol in engine coolant can catch fire .
• Antifreeze is poisonous. Always store antifreeze
in its original
container and well out of the reach of children .
• If you drain the coolant , it mu st be caught and safely stored in
a proper container clearly marked "poison ".
~

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0 Note
• Coolan t poll utes the environment and co uld cause an engine fire.
Excess coolant w ill be forced out throug h the pressure relief valve in
t he cap w hen the eng ine becomes ho t.
• If, i n an emer gency, only water can be adde d, the correct ratio
between wate r an d an tifree ze=>
page 28 6 must be restored as soon
as possib le.
<£> For the sake of the environment
Dra ined coolant should not be reused. A lways dispose of used coolant
w hile observ ing a ll enviro nmental regula tions. •
Radiator fan
The r adia tor fan switc hes on au tomatic ally by its elf .
Th e radiator fan is dr iven by the e ngine vi a the V-bel t. Th e v iscous
clutch regu lates the speed of the fan accord ing to the temperature of
th e co olan t.
An auxiliary e lectr ic rad iator fan* sw itches on a nd off depend ing o n
coo la nt temperat ure and other vehicle ope rating conditions .
After you sw itch t he engi ne off, the a uxiliary f an can con tinue r unning
for up to 10 minutes -even w ith the ignition off . It can even switch on
a g ain lat er by itse lf=> &, if
• the temperature of the e ngine coola nt rises due to the heat build ­
up from the eng ine in the engi ne compa rtment, o r
• the engine compartment heats up because the vehicle is parked in
intense s unlight .
& WARNING
• To reduce the risk of personal injury never touch the radiator
fan.
Vehicle OP-eration
& WARNING (continued )
• The auxiliary ele ctric fan is temperature controlled and can
switch on suddenly even when the engine is not running.
• The auxiliary radiator fan switches on automatically when the
engine coolant reaches a certain temperature and will continue to
run until the coolant temperature drops. •
Brake fluid
Checking brake fluid level
The brake flu id level ca n be chec ked wit h a quick gl an ce.
Fig . 224 Engi ne
c ompartm ent : Brake
fluid re se rvoir
B efo re you check anyth ing i n the e ngine compartment ,
always read and heed all WARNINGS~ & in " Workin g in
t h e e ng in e co mpartme nt" on
p age 280.
- Rea d the b rak e fl uid le ve l f ro m t he brak e fluid re serv oir
~ f ig. 224. The br ak e fl uid le vel mus t be be tw ee n the
" M IN " an d "MAX " m ar kin gs.
Th e br ake fl uid re se rvoir is loca ted at th e rear pa rt iti on of the engine
compartment on the left side=>
page 281. .,_
Vehicle care Do-it-yourselt service iTechnical data

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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.
With certain types of a irbag deployment, the battery is disconnected
from the vehicle electrica l system for safety reasons~
& in "Repair,
care and disposal of the airbags" on
page 213.
Disconnecting the battery terminals
Some vehicle funct ions (power window regulators, for example) are
lost if the battery terminals are disconnected. These functions have
to be relearned after the battery termina ls are connected aga in . To
prevent this, the battery should only be disconnected from the
vehicle electr ica l system when absolute ly necessary for repairs.
Vehicles not driven for long periods
If you do not drive your veh icle over a period of several days or weeks,
electrical components are gradually cut back or switched off. This
reduces energy consumption and maintains starting capability ove r a
longer period
~ page 247.
Take into consideration that when you unlock your vehicle, some
convenience functions, such as the master key remote function or
powe r seat adjustment, may not be available. The convenience func ­
tions will be available again when you turn on the ignition and start
the engine.
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, particu larly in city traffic or
when travel ing only short distances. Let your authorized Audi dealer
check the capacity of the vehicle battery before winter sets in
~ page 293. A well charged battery will not only p revent start ing
problems when the weather is cold, but will also last longer.
Safety first
(I] Tips
If your vehicle is left standing for several weeks at extremely low
temperatures, the vehicle battery shou ld be removed and stored
where it will not freeze. This will prevent it from being damaged and
having to be replaced. •
Working on the battery
Be especially careful when working on or near the
battery.
The battery is located in the luggage compartment under the
floor. Before you check anything in the lu~gage compart­
ment,
read and heed all WARNINGS =:,& .
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. .,_
Vehicle care Technical data

Checking and filling IJl!II
--------------------------------------------=------- =------
<£> For the sake of the environment
Because of the problem of proper disposal of a battery, we recom­
mend your authorized Audi dealer change the battery for you.
Batte ries contain sulfuric acid and lead and must always be disposed
of properly in compliance with all environmental regulations.
Disposing of vehicle batter ies improperly is very dangerous to the
environment. •
Windshield/headlight washer
container
Fig. 226 Engine
co mp artmen t: Wind­
sh ield and headlight*
washer fluid container
The washer fluid container is marked with the symbol Q on
its cap.
- Before you check anything in the engine compartment,
always read and heed all WARNINGS => & in "Working
in the engine compartme nt" on
page 280 .
-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.
Vehicle OP-eration
You can find the reservoir capacity in the table in::::, page 342.
Clean water should be used when filling up. If possible, use soft water
to prevent scaling on the washer jets. Always add a glass cleaner solu­
tion (with frost protection in the winter).
0 Note
Do not mix engine coolant antifreeze or any other additives to fill up
the windshie ld washer reservoir .•
Vehicle care Do-it-yourselt service iTechnical data

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in. WARNING
• Never use the spare tire if it is damaged or if it is worn down to
the tread wear indicators.
• If the spare tire is more than 6 years old, use it only in an emer­
gency and with extreme caution and careful driving.
• The spare tire is intended only for temporary and short-term
use. It should be replaced as soon as possible with the normal
wheel and tire.
• After mounting the compact spare tire, the tire pressure must
be checked as soon as possible. The tire pressure for the compact
spare tire is located on the driver 's side B-pillar
=> page 300,
fig. 227.
• Do not drive faster than 50 mph (80 km/h). You risk having an
accident.
• Avoid full-throttle acceleration, heavy braking, and fast
cornering. You risk having an accident.
• Never drive using more than one spare wheel and tire. You risk
having an accident.
• Normal summer or winter tires must not be mounted on the
compact spare wheel rim.
• For technical reasons, the use of tire chains on the spare tire is not permitted. If it is necessary to drive with tire chains, the spare
wheel must be mounted on the front axle in the event of a flat in
a rear tire. The newly available front wheel must then be installed
in place of the rear wheel with the flat tire. Installing the tire
chain before mounting the wheel and tire is recommended.
• Loose items in the passenger compartment can cause serious
personal injury during hard braking or in an accident.
-Never store the inflatable spare tire or jack and tools in the
passenger compartment.
- Always store all jacking equipment, tools, and the inflatable
spare tire in the luggage compartment.
& WARNING (continued)
-Tighten the knurled retaining screw for the inflatable spare
tire securely. •
Changing a wheel
Before changing a wheel
Observe the following precautions for your own and your
passenger's safety when changing a wheel.
- After you experience a tire failure, pull the car well away
from moving traffic and try to reach level ground before
you stop ~& .
- All passengers should leave the car and move to a safe
location (for instance, behind the guardrail) =>& .
- Engage the parking brake to prevent your vehicle from
rolling unintentionally ~& .
- Move selector lever to position P
~ &.
- If you are towing a trailer: unhitch the trailer from your
vehicle.
- Take the jack~
page 318 and the spare tire~ page 319
out of the luggage compartment.
in. WARNING
You or your passengers could be injured while changing a wheel if
you do not follow these safety precautions:
• If you have a flat tire, move a safe distance off the road. Turn
off the engine, turn the emergency flashers on and use other
warning devices to alert other motorists. ._

Emergency situations Ill
-------------=----
Connect POSITIVE (+) to POSITIVE (+) (red)
- Remove the cover above the jump start connectio n.
- Open the red cover o n the positive pole~
page 334,
fig. 248.
1 . Connect one e nd of the pos it ive cable ( red) on the
jump
start bolt~
page 334, fig. 249 (D (Bolts under red cover
= "positive") of the veh ic le to be started @.
2 . Connect the other end to the positive te rminal @ of the
booster ba ttery @.
Connect NEGATIVE(-) to NEGATIVE(-)
(black)
3. Con nect o ne end to the negative ter minal ® of the
boost er batte ry @ .
4. Connect the other end o f the nega tive cab le (black) to the
jump start bolt© (Bolts with hex head = "ne gative") of
the vehicle to be starte d @ .
Starting the engine
- Start the e ngine of t he ve hic le w ith the boos ter ba ttery.
Run the engine at a moderate speed.
- Start eng ine w it h discharged ve hicle bat tery in t he usu al
manner .
- If the engine fai ls to sta rt: do not k eep the s tarter
c ra nki ng for longer tha n 1 0 seco nds. Wait for a bou t
30 se conds and then t ry again.
- With engine ru nni ng, remove jumper cables from bot h
ve hicle s in th e exac t
re verse ord er.
- Close t he red cover on the pos it ive po le.
Safety first
T he battery is vented to the outside to prevent gases from enter ing
t he ve hicl e inter ior. Make su re tha t the ju mper clamps are we ll
connected with the ir
metal parts in full contact with the battery
terminals .
& WARNING
To avoid serious personal injury and damage to the vehicle, heed
all warnings and instructions of the jumper cable manufacturer . If
in doubt, call for road service .
• Jumper cables must be long enough so that the vehicles do not
touch.
• When connecting jumper cables , make sure that they cannot
get caught in any moving part s in the engine compartment .
• Do not bend over the batteries · danger of chemical burns!
• The battery cell locking screws mu st be tightened securely .
• Before you che ck anything in the engine compartment, always
read and heed all WARNINGS=>
page 272, ''Eng ine compart­
ment ".
0 Note
Imprope r hoo k-up o f jumpe r cab les can ruin the gene rator.
• Always connect POSITIVE( +) to POSITIVE(+), and NEGATIVE( -)
t o NEG ATI VE( -) ground pos t of the ba tte ry m anag er cont rol unit.
• Check that all sc rew p lugs on the battery cells are screwed in
fi rm ly . If no t, tig hten plugs prio r to con nectin g clamp on neg ative
battery terminal.
• P lease note that the proced ure for connecting a jumper cable as
described above app lies specifically to the case of your vehicle being
jum p st arted. When you a re giving a jump sta rt to anot her vehicle, do
not connect the negative( -) cab le to the negative (-) terminal on the
discharge d batte ry © =>
page 334, fig. 249 . Instea d, sec urely
connect the negative( -) cable to either a solid meta l component t hat
is f irm ly bolted to t he eng ine b lock or to the eng ine b lock itself. If the .,_
Vehicle care Do-it-yourself service Technical data

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& WARNING
• To reduce the risk of serious injury and vehicle damage.
-Always lift the vehicle only at the special workshop hoist and
floor jack lift points illustrated=>
page 338, fig. 254 and
=> page 338, fig. 255.
- Failure to lift the vehicle at these points could cause the
vehicle to tilt or fall from a lift if there is a change in vehicle
weight distribution and balance. This might happen, for
example, when heavy components such as the engine block or
transmission are removed .
• When removing heavy components like these, anchor vehicle
to hoist or add corresponding weights to maintain the center of
gravity. Otherwise , the vehicle might tilt or slip off the hoist ,
causing serious personal injury.
0 Note
• B e aw are of the following poi nts b efo re li fting the ve hicl e:
- The vehicle should never be lifted or jacked up from under­
neath the engine oil pan, the transmission housing , the front or
rear axle or the body side members . This could lead to serious
damage.
- To avoid damage to the underbody or chassis frame, a rubber
pad must be inserted between the floor jack and the lift points.
- Before driving over a workshop hoist, check that the vehicle
weight does not exceed the permissible lifting capacity of the hoist.
- Before driving over a workshop hoist, ensure that there is
sufficient clearance between the hoist and low parts of the
vehicle. •
Safety first Vehicle care Do-it-yourself service Technical data

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• oil changes, and
• cl eaning or re placing t he air fi lter.
W For the sake of the environment
By reg ula rly m ainta ini ng yo ur vehicl e, you h elp ma ke sure th at emis­
sion standards are ma inta ined, thus mi nimizi ng adve rse effects o n
t he environmen t.•
Important considerations for you and your
vehicle
T he i ncreasing use of e lec tronics, soph is tica ted f uel inject io n a nd
em ission cont rol systems, and the gene rally increasing tec hnica l
c o m plex ity of to d ay' s automob iles, have ste adily re duced the s cope
of ma intenance and repairs wh ich can be carr ied o ut by vehicle
ow ne rs.
Also, safety and environmental co ncerns p lace very st ric t
limits o n the nature of re pairs and adjust ments to engi ne and trans­
mission parts which an owner c an per form .
Ma int ena nce, ad justments and repairs us ually r equire sp ecial tools,
test ing devices an d other e quipme nt available to s pec ia lly trai ne d
wo rks ho p pe rsonn el in order to assure p roper perfor mance, rel i­
ability and safety of the vehicle and its many systems.
Impro per m aintenan ce, a djustments an d repair s can im pair the ope r­
ation and reliability of your vehicle and even void your vehicle
wa rranty . Therefo re, proo f of se rvicing in accordan ce wi th the ma in ­
t enance schedule may be a condi tion fo r upholding a possib le
wa rranty cla im made w it hi n the wa rra nty period .
Above all, operat io nal safety can be adversely affected, crea ting
unnecessary risks for you and your passe nge rs.
I f i n do ub t abou t any se rvi cing, have it done by you r authorized Audi
dealer or a ny other pro perly eq uipped and qualified wo rkshop . We
st rong ly ur ge yo u to give you r a uth orized Aud i dea ler the opportun ity
t o pe rfor m all scheduled mainte nance a nd necessary repairs. Yo ur dea
ler has t he facilit ies , original parts a nd trai ned spec ia lists to keep
you r vehicle ru n ning pr operly.
Performing limited maintenance yourself
The follow ing pages des cribe a lim ited nu mber of pro ce dur es which
can be perfo rmed on your vehicle wit h ord ina ry tools, s houl d the need
a ris e a nd tra ined p erson ne l b e unavailable. Before perfo rm ing any o f
these procedures, always thorough ly r ead a ll of the applicab le text
a nd caref ully follow the ins truc tion s given. A lw ays r igoro usly o bserve
t he
WARNINGS prov ided .
Before you check anything in the engine compartment, always read
and heed all WARNINGS=>
& and=> & in "W orkin g in t he engine
compartment" on
page 280.
& WARNING
• Serious personal injury may occur as a result of improperly
performed maintenance, adjustments or repairs.
• Always be extremely careful when working on the vehicle.
Always follow commonly accepted safety practices and general
common sense . Never risk personal injury .
• Do not attempt any of the maintenance, checks or repairs
described on the following pages if you are not fully familiar with
these or other procedures with respect to the vehicle, or are uncer­
tain how to proceed.
• Do not do any work without the proper tools and equipment.
Have the necessary work done by your authorized Audi dealer or
another properly equipped and qualified workshop.
• The engine compartment of any motor vehicle is a potentially
hazardous area . Never reach into the area around or touch the
radiator fan. It is temperature controlled and can switch on
suddenly -even when the engine is off and the ignition key has
been removed . The radiator fan switches on automatically when
the coolant reaches a certain temperature and will continue to run until the coolant temperature drops. _,,,