2008 AUDI A4 AVANT check engine

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& 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
extra safety afforded by the ABS tempt you into taking extra risks.
The ABS cannot overcome the laws of physics.
[ i] Tips
• If ABS is not functioning properly, a warning light will come on.
See~ page 21.
• If a fault occurs in the ABS , the EDL is also not functioning. This
is indicated by the ABS warning light. •
Brake assistant
The 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 quickly, 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 release the brake pedal.
The brake assistant will not be operative if there is a malfunction in
the ABS.
Controls and equip­
ment Safety first
Vehicle operation
& WARNING
Please remember that the accident risk always increases if you
drive too fast, especially in corners or on a slippery road, or if you
follow the vehicle ahead of you too closely. An increased accident
risk cannot be compensated even by the brake assistant, so
always maintain a safe speed. •
Servotronic® -advanced power
steering system
The power steering systems uses the power of the
running engine to allow precise steering with little effort. Your Audi is equipped with the electronically controlled
Servotronic® advanced power steering system. It adjusts
the degree of steering assistance to the roadspeed.
The advanced Servotronic ® power steering system senses the road
speed and electronically adjusts power assistance to provide
comfortable 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 wheel will be hard to turn.
The power steering fluid level is checked during the scheduled
maintenance services.
0 Note
If there is an electronic malfunction, servotronic will still function
like a conventional power steering system, providing a constant
steering support force that is no longer proportionate to the vehicle
speed . This is most noticeable when turning the steering wheel at
low speeds (for example when parking), -more effort will be
required than usual.
.,.
Vehicle care Do-it-yourself service Technical data

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• Be aware of the different than usua l steering response and
adjus t you r steer ing forc e acc ordin gly.
• Have the prob lem checked and set right by an Audi dea ler as
s o on as poss ible.
[ i] Tips
• When t he engi ne is running, never ho ld t he steer ing w heel
turned all the way to the right or to the left for longer than 15
seco nds. Th e powe r steering p ump w ill ove rhea t th e hydra ulic flu id
if you keep holding the steer ing whee l turned a ll the way . T his is
l ike ly to d amage t he powe r stee ring sys tem.
• I f the power steering system should fail entirely, or if the engine
i s not r unning ( for e xa mpl e, while being t owed), you will still be able
to steer the vehicle . However,
considerably more effort wil l be
r e q uired to do s o.
• I f the power steering system should have a lea k, or is not func ­
t ioning pr operly, co nt ac t yo ur auth orize d Audi deale r immedia tely.
• T he power steering system requires a specia lly formu lated
h ydraulic fluid. T he power s teeri ng reserv oir is th e one loca ted m ost
forward on the left side of the engine
compartment=> page 265,
"Engine co mpartme nt". The c orrect f luid level in the reservoir is
important for proper functioning of the power steering .•
Ap plies to veh icl es : w ith A ll Whee l Dr ive
Driving with your quattro®
Wit h All Whe el Dr ive, all fo ur w heel s are d riven .
Gen eral information
With All W heel Dr ive, powe r is d istributed to all four w hee ls . T hi s
happens automatica lly depending on your dr iving style and the
r oa d c ondit ions at th e time. See
also => page 237, "Elec tronic diff er­
entia l lock (E DU" .
Winter tires
When driv ing in th e win te r, yo ur ve hicle with All Wheel Drive ha s an
advantage, even with regular t ires. In winter road conditions it may
b e advi sable to m ount win ter tires ( or all -s easo n tires) for impr oved
driveabi lit y and braking : th ese tires mus t be moun ted on
all four
wheels .
See also => page 31 0, "Winter tires".
Snow chains
Whe re snow cha ins a re ma ndato ry on certai n roa ds, th is norma lly
a lso app lies to veh ic les with a ll-wheel
dr ive=> page 311, "Snow
chain s".
Replacing wheels /tires
Ve hicles wit h All Wheel D rive mu st always have t ires of the sa me
size . A lso avo id tires with different tread depths . For details see
page
=> page 305 .
Off-Road dri ving?
Yo ur Au di d oes not have e nough gr ound clea ra nce to be use d as an
off -road vehic le . It is therefore best to avoid rough tracks and
u neven te rr ain as much as poss ible . Also refe r
to => page 2 45.
& WARNING
Alway s adjust your driving to road and traffic condition s. Do not
let the extra safety afforded by the all -wheel drive tempt you into
taking extra risks .
• Although the quattro ®all-wheel drive is very effective, always
remember that braking capacity is limited by tire traction. You
should therefore not drive at e xcessive speeds on icy or slippery
road surfaces.
• On wet road surfaces , be careful not to drive too fast be cause
the front wheels could begin to slide on top of the water (hydro ­
planing ). If this should occur , you will have no warning from a
sudden increase in engine speed as with a front -wheel drive
vehicle . Always drive at speeds which are adjusted to the road
conditions - risk of crash! •

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one half. Never drive faster than the posted speed limit and weather
conditions permit. •
Reducing unnecessary idling
Even when your car is just idling it burns up fuel.
- Shut the engine off when you are not driving the vehicle .
- Do not warm up the vehic le by letting the engine run at
id le .
It makes sense to shut off the engine in traff ic jams, when waiting
for tra ins to pass at rai lroad crossings , or at traffic lights that have
long waits on red. Turning the engine off for just 30 -40 seconds
saves more fue l than is burned starting the engine again .
It takes a long time for the engine to warm up fu lly when it is
running at idle. However, wear and noxious emiss ions are espec ially
high when the engine is warming up . So you should drive away as
soon as you sta rt the engine and avoid running at high rpms w hile
the engine is sti ll warming up.
0 Note
Do not leave engine idling unattended after starting . If warning
lights should come on to indicate improper operation, they would
go unheeded. Extended id ling also produces heat, which could
resu lt in overheating or other damage to the vehic le or other
property .•
Regular maintenance
A badly tuned engine unnecessarily wastes a lot of fuel.
- Have your ve hicle serviced at regular intervals .
By having your vehicle regularly serviced by an Audi dealer helps to
ensure that it runs properly and economical ly . The cond ition of your
vehic le not only affects its safety and abi lity to hold its value, it also
affects
fuel consumpt ion .
Check your oil ea ch time you fill your t ank .
The amount of oil used is related to engine load and speed.
I t is norma l for the oi l consumption of a new engine to reach its
lowest value after a certain mi leage has been driven.
You must drive your vehicle about 3,000 miles (5,000 kilometers) before you can properly assess oil consumption .
This also applies to fue l consump tion and engine output .
0 Note
• Have your vehicle maintained properly and in accordance with
t he service recom mendat io n s in your Maintenance
& Wa rranty
booklet. Lack of proper ma intenance as well as improper use of the
vehic le wi ll impai r the function of the emission cont rol system and
cou ld lead to damage.
• Do no t alte r or remove any component of the Emission Contro l
System unless approved by the manufacturer .
• Do not alte r or remove any dev ice, such as heat shields,
switches, ignition wires, valves, which are designed to protec t your
vehic le's Emission Control System and other important veh ic le
components .•
Fewer short trips
Fuel consumption will alw ays be rel atively high on short
t r ips.
- Try to avo id driving short dis ta n ces wi th a cold engine. ~

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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 t hat the add it ional load
wi ll affect durability, economy and performance.
Trailer towing not only p laces more stress on the veh icle, it a lso ca lls
for more concentration from the driver.
For th is reasons, always fo llow the operating and dr iving instruc ­
t ions provided and use common sense. •
Technical requirements
Trailer hit ch
Use a weight -carrying hitch conforming to the gross trailer weight.
The hitc h must be suitab le for your veh ic le and tra iler and must be
mounted securely on the vehicle's chassis at a technically sound
l ocation. Use only a tra iler hitch with removable bal l mount. A lways
check with the trai ler hitch manufacturer to make sure that you are
using t he correct hitch .
Do not use a bumper hit ch .
The hitch must be installed in such a way that it does not interfere
with the impact-absorb ing bumper system . No mod ifications
shou ld 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 hit c h ball
mount. Th is prevents the hitch from causing damage s hou ld your
vehic le be struck from
behind ~& .
Tire pre ssure
When towing a trailer, inf late 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 tra iler and tire manufacturers' specifica­
t ions.
Lights
T he head ligh t settings shou ld be checked with the trailer at tached
before driving off. Have the head lights adjusted as necessary so
t hat you can see t he road ahead bu t not bl ind oncom ing traffic.
Check to make sure both vehicle and trailer lights are working prop ­
e rly .
Engine cool ing sy stem
Towing a t railer makes the eng ine work ha rder. It is imp ortant tha t
the cooling system's performance stands up to the additiona l
strain. Make sure that the coo ling system has enoug h fluid.
Traile r br ake s
If your tra ile r i s eq uipped wi th a braki ng system, check to be s ure
that it conforms to al l regu lations .
T he tra iler hydraulic brake system must no t be direct ly connected to
the vehic le's hydrau lic brake system .
Safety chains
Be sure trailer safety chains are properly connected from the trai ler
t o the h itch on the vehicle. Leave enough s lack in t he chains to
permit turning corners. When you install safety chains, make sure
they will not drag on the road when you are driving.
T he chains shou ld cross under t he trailer tongue to prevent it from
dropping in case of separation from the hitch. _,,,

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Safety belts
Only well-maintained safety belts work reliably when
needed.
- Keep belts clean.
- For cleaning, use a mild soap and water solution. Let
belts dry thoroughly and away from direct sunlight.
- Do not allow inertia reel safety belts to retract before
they are completely dry.
- Check the condition of your safety belts
regularly.
Heavily soiled safety belts may not retract properly.
& WARNING
Damaged safety belts can break in a crash.
• Anything that might damage your safety belts could mean that
you and your passengers would not be adequately protected in an
accident.
• Safety belt performance depends on correct installation. Never
remove belts from the vehicle to clean them.
• Do not use chemical cleaning agents, bleach or dyes. They have
corrosive properties which weaken the webbing.
• When cleaning your safety belts, inspect them for damage. If
you discover damage, see your Audi dealer.
• Always read and heed all WARNINGS and the information
=> page 254. •
Engine compartment
Be especially careful when cleaning the engine compart­
ment.
Always switch off the ignition before cleaning the engine => &.
Plenum panel
Remove leaves from the plenum panel in front of the windshield
under the engine hood. This prevents the water drain holes from
becoming blocked, and it prevents debris from entering the vehicle
interior through the heating and ventilation ducts .
Corrosion protection
The engine compartment and transmission have been corrosion­
protected at the factory.
Good anti-corrosion treatment is very important, particularly in the
winter. If the vehicle is frequently driven on salt treated roads, the
entire engine compartment and plenum panel should be thor ­
oughly cleaned at the end of winter and retreated to prevent salt
damage. At the same time, the underside of the vehicle should be
washed as well.
If the engine compartment is cleaned at any time with grease
removing solutions
21 , or if you have the engine washed , the anti­
corrosion treatment is almost always removed as well. It is therefore
essential to have a long-lasting corrosion protection reapplied to all
surfaces, seams, joints and components in the engine compart ­
ment.
& WARNING
Be aware: the engine compartment of any motor vehicle is a
potentially hazardous area.
• Before working in the engine compartment, be sure to read the
information
=> page 265 . .,,_
21 Use only the corr ect cleaning solutions. Never use gasoline or diesel fuel.
Vehicle care

-Checking and filling Pll':f..._--=--=--------------
Checking and filling
Engine hood
Releasing the engine hood
The engine hood is released from inside the vehicle.
Fig. 203 Driver's side
footwell: engine hood
release lever
- Pull the release lever on the left under the instrument
panel=> fig. 203 in the direction of the arrow.
The hood pops up slightly under spring pressure. •
Opening the engine hood
Fig. 204 Release lever
under the hood
Before opening the engine hood, make sure that the wind ­
shield wipers are flat against the windshield. Otherwise,
they could damage the paint on the hood.
Lift the hood
slightly=> ,&.
- Pull the release under the hood => fig. 204. This releases
the catch.
- Open the hood all the way.
The hood is kept in the open position by a gas strut.
& WARNING
Hot engine coolant can burn you.
• To reduce the risk of being burned, never open the hood
if you
see or hear steam or coolant escaping from the engine compart-.,..

Checking and filling -
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& WARNING (continued)
ment. Wait until no steam or coolant can be seen or heard before
carefully opening the hood.
•
Closing the engine hood
- Pull the hood down until the pressure from the strut is
reduced.
- Let the hood
drop down and latch in place. Do not try to
push
it shut; it may fail to engage =:>& .
& WARNING
A hood that is not completely latched could fly up and block your
view while driving.
• When you close the engine hood, check it to make sure the
safety catch has properly engaged. The hood should be flush with
the surrounding vehicle body parts.
• If you notice while driving that the hood is not secured prop­
erly, stop at once and close it. •
Working in the engine compartment
Be especially careful whenever you work in the engine
compartment.
Whenever you must perform any work in the engine compartment,
for example checking and filling different fluids, there is a risk of
injury, burns and accidents. To prevent personal injury always
observe the following WARNINGS . The engine compartment of any
vehicle is a hazardous area
=> & .
• I I • • I
& WARNING
To help avoid injury, before you check anything under the hood:
• Turn off the engine.
• Remove the ignition key .
• Apply the parking brake.
• Move selector lever of automatic transmission to
"P" (Park);
put manual transmission in Neutral.
• Always let the engine cool down. Hot components will burn
skin on contact.
• To reduce the risk of being burned, never open the hood if you
see or hear steam or coolant escaping from the engine compart­
ment. Wait until no steam or coolant can be seen or heard before
carefully opening the hood.
• Keep children away from the engine compartment.
• Never spill fluids on hot engine components. They can cause a
fire.
• Never touch the radiator fan. The auxiliary electric fan is
temperature controlled and can switch on suddenly.
• Never open the coolant reservoir cap when the engine is still
warm . The coolant system is pressurized and hot coolant could
spray out.
• Protect your face, hands and arm from steam or hot engine
coolant by placing a thick rag over the cap when you open the
coolant reservoir .
• If work on the fuel system or the electrical system is necessary: -Always disconnect the battery.
- Never smoke or work near heaters or open flames. Fluids in
the engine compartment could start a fire .
- Keep an approved fire extinguisher immediately available.
• To avoid electrical shock and personal injury while the engine
is running or being started, never touch:
- Ignition cables
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Vehicle care

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& WARNING (continued )
-Other components of the high voltage electronic ignition
system .
• If you must perform a che ck or repair with the engine running:
- Fir st, fully apply the parking brake , move selector lever of
automatic transmission to
" P " (Park ); put manual transmission
in Neutral.
- Alway s use extreme caution to prevent clothing , jewelry , or
long hair from getting caught in the radiator f an, V -belts or
other moving part s, or from contacting hot parts. Tie ba ck hair
before starting , and we ar no clothing that will hang or droop
into the engine.
• Min imize e xposure to emission and chemical hazards
=> & .
& WARNING
California Proposition 65 Warning :
• Engine exhaust , some of its constituents , and certa in vehicle
c omponents contain or emit chemicals known to the State of Cali­
fornia to cause cancer and birth defects and reproductive harm . In
addition , certain fluids contained in vehicles and certain products
of component wear contain or emit chemical s known to the State
of California to cause cancer and birth defects or other reprodu c­
tive harm.
• Battery posts, terminal s and related accessories contain lead
and lead compounds , chemicals known to the State of California
to cause cancer and reproductive harms . Wash hands after
handling.
0 Note
When a dding f luids, always make sur e tha t they are poured i nto the
prop er container or filler opening, otherwise serious damage to
ve hicle syste ms wi ll occur .
ffi For the sake of the environment
To detect leaks i n time, inspect the veh icle floor pan from unde r­
neath regularly. If you see spots from oil or other vehicle fluids, have
your veh ic le i nspected by a n authori zed Audi dealer. •
Engine compartment
Applies to v ehic les: with 2 .0 I tur bo, 4-cy linder -e n gi ne
2 .0 I, 4-cy linder turbo engine (200 hp)
T hese are th e mo st impo rtant items that you ca n check .
Fig . 205 Engine comp artment : 2 .0 I , 4-cylind er turbo
G) Battery ... ..... .. ... .... ... ...... ... .. .. ... .. .
0 Engine oil fil le r cap ( G) Brake fl uid re servo ir ( ) . .... ... .... ...... ... .. .
© Engine oil dipstick ( orange) .. .... .. .... .... ... .. .
285
2 78
2 8 4
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