check engine AUDI A5 COUPE 2010 Owner's Guide

___ C_h_ e_ c_k _in --== g'-- a_n _d_ f_il _li _n ..:::g:::..- ___________________________________________ _
0 Note
• Before winter sets in, have the coolant checked to see if the
coolant additive in your vehicle is sufficient to meet the climate
conditions. This is especia lly important if you live in a region where
the winter is extremely cold. If necessary, increase the proportion of
coo lant additive to 60%.
• When adding coolant additive to your coo ling system,
reme mber:
- We recommend using only coolant additive G12+ + (check the
label) for your vehicle. This coolant addit ive is ava ilable at autho­
rized Audi dealers . Other types of antifreeze can significantly
reduce corrosion protection . The resulting corrosion can cause a
loss of coolant and serious engine damage.
• Do not add any type of radiator leak sealant to your vehicle's
engine coolant . Adding radiator repair fluid may adverse ly affect the
function and performance o f your cooling system and cou ld result
in damage not covered by your New Vehicle Limited Warranty. •
Checking the engine coolant level
The engine coolant level can be checke d with a quick
glance.
Fig . 2 25 Engine
c omp artmen t: Coo la n t
e xpan sion tank
Be fo re y ou c heck anything in the e ngine compar tm en t,
always read and heed all WARNINGS==> & in "Working in
the eng ine compartment" on
page 271.
Tur n off the ignitio n.
- Let the engine coo l down.
P lace a th ick rag ove r the coola nt expans io n tank
==> fig. 225 and carefully twist th e cap counter-c lockwise
==> & .
Read t he e ngin e coola nt level i n the open coo la nt expan­
sion tank==> fig. 225. W ith a cold eng ine, the coolant leve l
sho uld be bet ween the "m in" and "max" markings. W hen
t h e eng ine is warm, the level may be slightly above the
"max" marking .
The location of the coolant expansion tank can be seen in the
engine compartment illustration=>
page 272.
To obtain an accurate read ing, the engine must be switched off .
The expansion tank in your vehicle is equipped with an e lectric
coo lant leve l sensor.
When the coolant leve l is too low, the warning light in the Auto ­
Check System =>
page 30will blink until you add coolant and the
level has been restored to normal. Even though there is an electric
coo lant level sensor, we still recommend you check the co olant level
from t ime to time.
C oolant loss
Coolant loss may indicate a le ak in the cooling system . In the event
of coo lant loss, the co oling system should be inspec ted i mmedi ­
ately by your authorized Audi dealer. It is not enough mere ly to add
coo lant.
In a
s ealed system, losses can occur on ly if the boi ling point of the
coo lant is exceeded as a result of overheating. ...

___________________________________________ C_ h_e _c_ k_ i_n _g _ a_n _d_ f_il _li _n _g __ ll'I
•
& WARNING
The cooling sy stem i s under pre ssure and can get very hot . Redu ce
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
ste am by cover ing the cap with a large , thick rag .
• Turn the cap slowly and very carefully
in a counter -clockwise
dire ction while applying light , downward pressure on the top of
the cap .
• To avoid being burned, do not spill antifreeze or coolant on the
e x haust 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 sea lant to your vehicle's engine
coolant. Adding radia to r repa ir flu id may advers ely affect the fu nc­
tion and performance of your coo ling system and could res ult in
damage not covered by y our New Vehic le Lim ited War ra nty .•
Adding coolant
B e very care ful when ad ding e ngine cool ant.
Be for e you check a nything in the engine com partmen t,
always read and heed all WARNINGS~ & in "Work ing in
t h e eng ine compa rtment" on
page 271 .
-Tur n o ff th e en gine.
- Let the e ng in e cool d own.
- Plac e a thi ck rag over the coo la nt expansion tank
~ page 2 78 , fig. 2 25 and carefully tur n t he cap coun te r­
cl ockwi se
~ &.
Add coo lan t.
- Twist the cap on aga in
tightly.
Replacement engine coolant must conform to exact specifications
~ page 2 77, "C oolant". Even in an eme rgency, if co olant addi tive
G12+ +, G12 + or G12 is not availab le, do not use a different additive.
U se pla in water ins tead until you can ge t the c orrect add itive and
can res tore the correc t rat io. Th is shou ld be done as soon as
p os sible.
I f y ou hav e los t a co ns ide rab le amou nt of coo la nt, then y ou should
add cold antifreeze and cold water only when the engine is cold .
A lways use
new e ngine c oolant w he n r efil ling .
D o not fill coolant a bove the " MAX" mark. Excess coola nt w il l be
forced out through the pressure relief va lve in the cap when 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
steam by covering the cap with a large , thick rag .
- Turn the cap slowly and very carefully 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 exhau st system or hot engine parts. Under certain condi ­
tions, the ethylene glycol in eng ine coolant can catch fire .
• Antifreeze is poisonous. Always store antifreeze in its original
container and well out of the reach of children .
• If you dra in the coolant , it must be caught and safely stored in
a proper container clearly marked "poison ".
~
Vehicle care I t •

•---=C:.:h..:. e=-= c..:.k :..:.in :..:.:= g:.....= a..:.n :.:d::....:. f.:.:il .:.:li ..:.n :..::g~ --------------------------------------------
0 Not e
• Coolant pollutes the environment and cou ld cause an engine
fire. Excess coolant will be forced out through the pressure relief
valve in the cap when the engine becomes hot.
• If, in an emergency, only water can be added, the correct ratio
between water and antifreeze ~
page 277 must be restored as soon
as possible .
ci> For the sake of the environment
Dra ined coolant should not be reused . Always dispose of used
coolant whi le observing all environmental regulations. •
Radiator fan
The radiator fan switches on automatically by itself.
The rad iator fan is driven by the eng ine v ia the V-be lt . The v iscous
clutch regulates the speed of the fan according to the tempera ture
of the coo lant .
An auxiliary electric radiator fan * swi tches on and off depending on
coo lant temperature and other vehicle operating conditions.
After you switch the engine off, the auxiliary fan can continue running for up to 10 minut es -even with th e igni tion o ff. It can even
switch o n again later by itself~ & , if
• the temperature of the engine coo lant rises due to the heat
bui ld -up from the engine in the engine compartment, o r
• the engine compartment heats up because the vehic le is parked
in intense sun light.
& WARNING
• To reduce the ri sk of per sonal injury never tou ch the radiator
f a n.
& W AR N ING (continu ed )
• The auxiliary e le ctri c fan i s temperature controlled and can
s w itch on suddenly even when the engine is not running .
• The auxiliary radiator fan swit ches on automatically when the
engine coolant reache s a ce rtain temperature and will con tinue to
run until the coolant t emperatur e drop s. •
Brake fluid
Checking brake fluid level
Th e brake fluid level c an be checked with a quick glance.
Fig . 22 6 En gin e
co mp art m ent : B ra ke
fl uid re servoir
Befo re yo u c heck anything in th e en gin e compar tme nt,
always read and heed all WARNINGS~ & in "Working in
the eng ine compartment" on
page 271 .
Read the brake fl uid level from the bra ke fluid reservoir
~ fig . 226. T he b rake fluid leve l must be betwee n the
" M IN " and "MAX" markings.
The brake fluid reservoir is located at the rear partition of the engine
compartment on the left side~
page 272 . .,_

-~_C_ h_e _c _ k_ i_n ...:::g::;...._ a_n_ d_ f_ i_ll _in -'g:::;.._ ___________________________________________ _
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 airbag deployment, the battery is discon­ nected from the vehicle electrical system for safety reasons=>
& in
"Repair, care and disposal of the airbags" on
page 202.
Disconnecting the battery terminals
Some vehicle functions (power window regulators, for example) are
lost if the battery terminals are disconnected. These functions have
to be relearned after the battery terminals are connected again . To
prevent this, the battery should only be disconnected from the
vehic le electr ical system when absolute ly necessary for repairs .
Vehicles not driven for long periods
If you do not drive your vehicle 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
over a longer period=>
page 241.
Take into consideration that when you unlock your vehicle, some
convenience functions, such as the master key remote function or power seat adjustment, may not be available. The convenience
functions 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, 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 284 . A well charged battery will not only prevent starting
problems when the weather is cold, but will also last longer.
[ 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. •
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 luggage
compartment,
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.

Checking and filling 111111
---------------------------=----
•
®
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
& WARNING (continued)
battery to heat up very quickly, which could lead to damage or
explosion and personal injury.
• When a battery is charged , it produces hydrogen gas which is
explosive and could cause personal injury .
• Always keep the battery well out of the reach of children. • Before work is done on the electrical system, disconnect the
negative ground cable .
• Before performing any work on the electrical 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
lights.
• Before disconnecting the battery , switch off the anti -theft
alarm system! Otherwise you will set off the alarm .
• When disconnecting the battery , first disconnect the negative
cable and then the positive cable .
• Before reconnecting the battery, make sure all electrical
consumers are switched off . Reconnect the positive 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
explode! If a battery has frozen, then it must be replaced . A
discharged battery can freeze over at 32 °F (0 °CI.
• 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! Always replace a damaged battery .
_& WARNING
California Proposition 65 Warning:
Vehicle care
I t •

___ C_h_ e_ c_k _in --== g'-- a_n _d_ f_il _li _n ..:::g:::..- ___________________________________________ _
Windshield/headlight * washer
container
F ig . 228 Engi ne
co mpa rtm ent: Wi nd­
s hiel d and hea dlight*
w ash er flui d cont ain er
The washer fluid containe r is marked with the symbol¢ on
its cap .
- Before you check anything in the engine compartment,
always r ead and heed all WARNINGS ~
& in "Working
in the engi ne compartment" on
page 271.
- 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 ca pacity in the table in=> page 337.
To prevent lime residue from building up on the spray jets, use
distilled water when refil ling . Always add a glass cleaner solution
(with frost protection in the winter).
(D N ote
Do not mix engine coolant antifreeze or any other additives to fill up
the windshield washer reservoir. •

-What do I do now?
...__ ______________
_
& 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 of the compact
spare tire must be 4.2 bar; otherwise, you risk having an accident.
• 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.
- 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
rol ling unintentionally :::;.& .
Shift into 1st gear on vehicles with manual transmission,
or move the selector lever to the P position on vehicles
w ith automatic transm ission* .
If you are towing a trailer: unh itch the trailer from your
vehicle.
Take the jack :::;.
page 310 and the spare tire~ page 311
out of the luggage compartment.
& 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.
• Make sure that passengers wait in a safe place away from the
vehicle and well away from the road and traffic.
~

________________________________________________ E_ m ___ e_r.::g ~e ___ n_c ~y:.- s;_ i_t _u :...:a:..:. t.:.: i...:o :...:n...:..:. s _ __,J_
& WARNING !continued)
• Before you check anything in the engine compartment, always
read and heed all WARNINGS~ page 263, "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. When jump starting or charging the
battery , never connect the negative ground cable to the battery
negative post because the battery manager system must be able to
detect the battery's state of charge. Always connect the negative
ground cable to the negative ground post of the battery manager
control unit .•
Use of jumper cables
Make sure to connect the jumper cable clamps in exactly
the order described below!
Fig. 251 Engine
compartment : Connec·
tors for jumper cables
and charger
Fig. 252 Jump starting
with the battery of
another vehicle: @
discharged vehicle
battery,
© booster
battery
The procedure described below for connecting jumper
cables is intended to provide a jump start for your vehicle.
Vehicle with discharged battery:
Turn off lights and accessories, move lever of automatic
transmission to
N (Neutral) or P (Park) and set parking
brake.
~
Vehicle care Do-it-yourself service irechnical data

lllffl.___E_ m _ e _r-==g :...e_ n_ c...:y _ s_ i_t _u _a _t_ i_o _n_ s _______________________________________________ _
Conn ect POSITIVE
(+) to POSITIVE (+) (red )
- Remove the cover above the jump start connection.
- Open the red cover on the positive pole
~ page 327,
fig. 251.
1. Connect one end of the positive cable (red) on the
jump
start bolt~ page 327, fig. 252 G) (Bolts under red cover
= "positive") of the vehicle to be started @.
2. Connect the other end to the positive terminal @ of the
booster battery @.
Connect NEGATIVE (-) to NEGATIVE (-) (black)
3. Connect one end to the negat ive terminal 0 of the
booster battery ®·
4. Connect the other end of the negative cable (black) to the
jump start bolt@ (Bolts with hex head= "negative") of
the vehicle to be started @.
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.
- With engine running, remove jumper cables from both
vehicles in the exact
reverse order .
- Close the red cover on the positive pole.
T he battery is vented to the outside to prevent gases from entering
th e vehicle interior. Make sure that the jumper clamps are well
connected with their
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 parts in the engine compartment.
• Do not bend over the batteries -danger of chemical burns!
• The battery cell locking screws must be tightened securely.
• Before you check anything in the engine compartment , always
read and heed all WARNINGS ~ page 263, "Engine compartment".
0 Note
Improper hook-up of jumper cables can ruin the generator .
• Always connect POS ITIVE(+) to POS ITIVE(+), and NEGATIVE(-) to
NEGATIVE( -) ground post of the battery manager control unit .
• Check that all screw plugs on the battery cells are screwed in
firm ly. If not, tighten plugs prior to connecting clamp on negative
battery terminal.
• Please note that the procedure for connecting a jumper cable as
described above applies specifically to the case of your vehicle
being jump started . When you are giving a jump start to another
vehicle, do
not connect the negative(-) cable to the negative{-)
terminal on the discharged battery©~
page 327, fig. 252. Instead,
securely connect the negative(-) cable to either a solid metal
component that is firmly bolted to the engine block or to the engine ..

-Emergency situations PW:f..._--=---=----------------
& 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
331, fig. 257 and
~ page 331, fig. 258.
- 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
• Be aware of the following points before lifting the vehicle:
- 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. •