check engine AUDI A5 COUPE 2011 Owner's Guide

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0 Note
• Before w inter sets in, have the coolant checked to see if the
coolant additive in your vehicle is sufficient to meet the climate
conditions. This is especially important if yo u live in a region where
the winter is extremely cold.
If necessary, increase the proportion of
coolant additive to 60% .
• When adding coolant additive to your cooling system, remember :
- We recommend using only coolant additive G12++ (check the
label) for your vehicle. This coolant additive is available at autho­
r iz ed Audi dealers. Other types of antifreeze can s ignificantly
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 flu id may adversely affect the
function and performance of 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 checked with a quick
glance.
Fig. 208 Engine
co mpartment : Coolant
expansion tank
Before you check anything in the engine compartment,
always read and heed all WARNINGS~ & in "Working in
the engine compartment" on
page 275.
-Turn off the ignition.
- Read the engine coolant level from the coolant expansion
tank~ fig. 208 . With a cold engine, the coolant level
should be between the "MIN" and "MAX" markings. When
the engine is warm, the level may be slightly above the
"MAX" marking.
The locat io n of the coolant expansion tank can be seen in the engine
compartment illustration~
page 276.
To obtain an accurate reading, the engine must be switched off.
The expansion tank in your vehicle is equipped with an electric coolant level sensor.
When the coolant level is too low, the warning light in the Auto-Check
System =>
page 34 will blink until you add coolant and the level has
been resto red to normal. Even though there is an electric coolant
level sensor, we still recommend you check the coolant level from
time to time.
Coolant loss
Coolant loss may indicate a leak in the coo ling system. In the event of
coolant loss, the cooling system should be inspected immediately by
your authorized Audi dealer. It is not enough merely to add coolant.
In a
sealed system, losses can occur only if the boiling point of the
coo lant is exceeded as a result of overheating .
& 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.

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0 Note
• Coolant pollutes the environment and could 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 a nd antifreeze ::::>
page 281 must be restored as soon
as possible.
ci> For the sake of the environment
Drained coolant should not be reused. Always dispose of used coolant
wh ile observ ing all environmental regulations.•
Radiator fan
The radiator fan switches on automatically by itself.
The radiator fan is driven by the engine v ia the V-belt. The viscous
clutch regulates the speed of the fan according to the temperature of
t he coo lant.
An auxiliary electr ic radiator fan* sw itches on and off depending on
coolant temperature and other vehicle operating conditions.
After you switch the engine off, the auxiliary fan can cont inue running
for up to 10 minutes- even with the ignition off. It can even switch on
again later by itse lf::::>
/1 , if
• the temperature of the engine coolant rises due to the heat build­
up from the engine in the engine compartment, or
• the engine compartment heats up because the veh icle is parked in
intense sunlight.
& WARNING
• To reduce the risk of personal injury never touch the radiator
fan.
/1 WARNING (continued)
• The auxiliary electric 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 fluid level can be checked with a quick glance.
Fig . 209 Engine
co mpartm ent : Brake
fluid reservoir
Before you check anything in the engine compartment,
always read and heed all WARNINGS=> & in "Working in
the engine compartment" on
page 275.
-Read the brake fluid level from the brake fluid reservoir
=> fig. 209. The brake fluid level must be between the
"MIN" and "MAX" markings.
The brake fluid reservoir is located at the rear partition of the engine
compartment on the left side=>
page 276. .,

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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 e lectrical system for safety reasons=>
& in "Repair,
care and disposal of the airbags" on
page 204.
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 aga in . 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 do not dr ive 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 243.
Take into consideration that when you unlock you r vehicle, some
convenience functions, such as the master key remote function or
power seat adjustment, may not be available. The convenience func­
tions will be available again when you turn on the ign ition and start
the engine.
W inter operation
During the w inte r months, battery capacity tends to decrease as
temperatures drop. This is because more power is also consumed
wh ile 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 dealer
check the capacity of the vehicle battery before winter sets in
=> page 288. A well charged battery will not only prevent starting
problems when the weather is cold, but will also last longer.
W 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 anyth ing 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 . .,,_

Checking and filling "" ------------------~::....::..:..._~---=---
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 rea ch 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 l~ad
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 open­
ings.
- If you get battery acid in your eyes or on your skin, imm~di­
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.
Safety first
& WARNING (continued)
• When working on the battery, be sure not to short-circuit the
terminals with tools or other metal objects. This would cause the 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. I! 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°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! Always replace a damaged battery. .,,_
Vehicle care Technical data

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Windshield/headlight* washer
container
Fig. 211 E ngine
compartment: Wind­
shie ld and headlight*
washer fluid container
The washer fluid container is mark ed with the symbol¢ on
its cap.
- Before you check anything in the engine compartment,
always read and heed all WARNINGS => & in "Working
in the engine compartment" on
page 275.
- 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 339.
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 windsh ield washer reservoir .•

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Connect POSITIVE(+) to POSITIVE(+) (red)
- Remove the cover above the jump start connection .
- Open t he red cover on the positive pole~
page 329,
fig. 232.
1. Connect one end of the positive cable (red) on the
jump
start bolt~
page 329, fig. 233 (D (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 negative terminal ® 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.
The battery is vented to the outside to prevent gases from entering
the 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 267, ''Engine compart­
ment".
0 Note
Improper hook-up of jumper cables can ruin the generator.
• Always connect POSITIVE(+) to POSITIVE(+), and NEGATIVE( -)
to NEGATIVE(-) ground post of the battery manager control unit.
• 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.
• Please note that the procedure for connecting a jumper cable as
described
above app lies specifically to the case of your vehicle be ing
jump started. When you are giving a jump start to another vehicle, do
not connect the negative (-) cab le to the negative(-) terminal on the
discharged battery©~
page 329, fig. 233. Instead, securely
connect the negative(-) cable to either a solid metal component that
is firmly bolted to the engine block or to the engine block itself.
If the _,,,

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in. 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 333, fig. 238 and
=> page 333, fig. 239.
- 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. •

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• oil cha nges, and
• cl ea ning or re placing th e air fi lter.
W For the sake of the environment
By regu larly ma intaini ng yo ur vehicl e, y ou h elp m ake su re th at em is­
sion standards a re mainta ined, t hus mi nimizing adverse effects o n
t he enviro nmen t. •
Important considerations for you and your
vehicle
Th e increas ing use of elect ronics, s ophistica ted fuel inje ct io n and
em ission cont rol systems, and t he generally increasing tec hnical
c omplex ity o f today' s automobile s, have s tea dil y re duced t he s cope
of maintena nce and repairs w hic h can be carr ied out by ve hicle
ow ners.
Also, safety and environmental c o nce rn s plac e very s trict
limits o n the nature of repa irs and adjustments to engine an d tra ns­
mission parts w hich an owner can pe rform .
M ain te nance, ad justm ents and r epairs us ua lly re quir e spec ia l t ools,
test ing devices an d other e quipment availab le to s pecia lly trained
wo rksh op pe rsonnel in order to assure pro per perfor mance, re li­
ability and safety of the vehicle and its many systems.
Impro per ma inte nance, adjustments and rep airs can im pa ir the ope r­
ation and reliability of your ve hicle and even void your veh icle
wa rranty . Therefo re, p ro of of se rvicing in a ccordance wi th t he ma in ­
t enance sch edul e may be a co nd it io n fo r u phold ing a possib le
wa rranty claim made w it h in the wa rranty pe riod.
Above all, operat io nal safety ca n be adve rsely affec ted, c reat ing
unnecessary r is ks for you and your passe ngers.
If in doubt abou t any serv ic ing, have it done by your authorized Audi
dealer or a ny o ther pro perly equipped a nd qualified workshop . W e
st rong ly ur ge you to give yo ur auth oriz e d Aud i dea ler the opportu nity
t o pe rform all sc heduled mainte na nce and necessary repairs. Yo ur
Safety first
dealer has the facilities, o rigina l parts and trained spec ia lists to keep
your vehi cle runni ng properly.
Performing limited maintenance yourself
The foll ow ing page s descr ibe a lim ite d num ber of proced ures whi ch
can be perfo rmed on your vehicle w it h ordina ry tools, shou ld the need
ar ise and tr ained pe rsonnel be u navailabl e. Befo re pe rforming any of
t hese p rocedures, always t horoughly read all of the applicable text
and ca ref ull y follow the ins tru ction s given . Alw ays rigoro 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 orking in the engine
compartment" on
page 275.
& 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. ..
Do-it,yourself service Technical data

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& WA RNING (conti nu ed )
• Always rem ove the ignition key before anyone get s under the
vehicle .
• Always support your vehicle with safety stands if it i s nece ssary
to work underneath the vehicl e. Th e jack supp lied with the vehicle
is not adequate for thi s purpose and could collap se causing
seriou s personal injury .
• If you must work underneath the vehicle with the wheels on
the ground, a lway s make sure the vehicle is on level ground, that
the wheels are alway s securely blocked and that the engine cannot
be started .
• Always make sure the transmi ssion selector lever (automatic
transmission ) is in "P " (Park po sition) or Neutral (manual tran s­
mission) and the park brake is firmly applied .
For the sake of the environment
• Changing the engine settings will adversely affect emission levels .
Thi s is det rimenta l to the envi ronme nt and increases fue l co nsump­
tion.
• Always observe enviro nmental regulations when disposing of old
engine oi l, used brake fl uid, dirty engine coo lant, spent batteries or
worn out t ires.
• Undep loyed a irbag modules an d pretens ioners migh t be classified
as Pe rchlorate Mater ia l -spec ial handling may apply, see
www.dtsc.ca.gov/hazardouswaste/perchlorate . When the vehicle or
parts of the rest raint system includ ing a irbag modu les safety belts
w ith pretens ioners are scrapped, all applicable laws and regulat ions
must be obse rved. Yo ur author ized Aud i dealer is f amiliar wi th t hese
req uirements and we recommend that you have your dealer perform
t his se rvi ce f or yo u.•
Additional accessories,
modifications and parts
replacement
Additional accessories and parts
replacement
A lways consult an autho riz ed Au di dealer bef ore
purchasing access ories.
Your vehicle incorporates the latest safety desig n featu res ens uring a
hig h standard of active and passive safety .
Th is safety co uld be compromised by non-app roved changes to the
vehicle. Fo r this reaso n, if par ts have to be replaced, p lease observe
the following points when installing addit ional accessories :
Approved Audi accessories and genuine Aud i parts are available from
author ized Aud i dea lers.
T hese dea lers a lso have the necessary fac ilities, tools and tra ined
specialists to i nstall the parts and a ccessor ies p roperly.
& WARNING
Using the wrong spare parts or u sing non-approved acces sorie s
can cause damage to the vehicle and serious personal injury.
• Use only accessories expressly approved by Audi and genuine
Audi spare parts
• These parts and accessories have been specially designed to be
used on your vehicle .
• Never install accessories such as telephone cradles or beverage
holder s on airbag covers or within the airbag deployment zones .
Doing so will increase the r isk of injury if airbags are triggered in
an accident!
• Before you check anything in the engine compartment , always
read and heed all WARNINGS~
page 267. _..