check engine AUDI A4 AVANT 2008 Service Manual

Checking and filling 111111
--------------------------------------------=-----=--------
& WARNING (continued )
battery to heat up very quickly , whi ch could le ad to damage or
explosion and personal injury .
• When a battery is charged , it produces hydrogen gas whi ch 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 electri cal 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 , fir st di sconnect the negative
c able 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 °Cl.
• 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.
in. WARNING
California Proposition 65 Warning :
• I I • • I
& WARNING (continued )
• Battery posts , terminals and related accessories contain lead
and lead compounds , chemicals known to the State of California
to cause cancer and reproductive problems . Wash hands after
handling.
0 Note
• Do not d isconnect th e ve hicle bat tery w hen t he ig ni tio n i s
switched on or when the engine is running , otherwise, you will
da mage e lec troni c c om pon ent s in the e lec trica l syste m.
• When working on the engine, protect t he battery housing from
u ltraviolet (UV) rays by not pa rking the ve hicle i n direct sun lig ht.
• If your vehicle is going to stand fo r a long period of time wit hout
being driven, pro tect the battery from "freezing", ot herwise it w ill
be damaged and wi ll then have to be replaced .•
Vehicle care

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Ap plies to vehi cles: with convent ional batte ries
Checking the battery acid level on
conventional batteries
The acid level of a conventional battery can be checked
visually.
Fig . 215 Engin e
co mp artmen t; Co nve n­
tio na l battery w ith acid
l eve l mar ks (cover
re m ove d)
-The level of acid inside the battery is visible through the
case at the font . Acid level should be exactly at t he "max"
mark or very close be low i t.
If the acid level has dropped below the "m in" mark, the low cell
should be topped to the
"max" mark with distill ed wa ter.
We recommend you have your authorized Audi dea ler test your
battery.
A battery that is older than five years and has a low acid level should be rep laced.
0 Not e
Do not overfill the battery, otherwise battery acid will overflow
through the vent opening . This can damage the paint and cause
corrosion. •
Battery charging
Starting the engine requires a well charged battery.
Always read and he ed all WARNINGS below => & and
=> & in "Working on the battery" on page 286.
-Switch off the ignition and all e lectrica l co nsumers.
-Make sure the area is well ventilated when you cha rge
t h e battery.
-Connec t charger cables . Charger cable s mu st alw ay s be
c onne cte d POSITIVE
G to POSITIVE G and NEGATIVE 8
to NEGATIVE (:).
-Switch on the charger.
-Make sure the charging rate is not over 6 amps.
-T urn off the charger ::::::,& .
-Disconnect the charger cab les .
-Connect both battery cables to the battery if necessary -
first plus, then minus.
It is not nec essary to remove the battery from th e engine compart ­
ment, and it is also not necessary to disconnect the cables.
Norma lly, a battery should be charged at no more than 10 percent
of its rated capacity . .,.
Ve hic le care irechnical data

___ C_ h_ e_c _k_ i_n ~g _ a_n_ d_ f_ il _li_ n~ g~--------------------------------------------
For example, a charging current of 4.5 amps would be used on a
battery rated at 45 Ah. Rated capacity of the battery in your vehicle
is listed on the battery housing .
The battery caps should
not be opened when charging a battery.
& WARNING
Charging a battery can be dangerous.
• Always follow the operating instructions provided by the
battery charger manufacturer when charging your battery.
• Never charge a frozen battery . It may explode because of gas
trapped in the ice. Allow a frozen battery to thaw out first.
• Do not reuse batteries which were frozen. The battery housing
may have cracked and weakened when the battery froze.
• Charge the battery in a well ventilated area. Keep away from
open flame or electrical spark. Do not smoke. Hydrogen gas gener ­
ated by the battery is explosive.
• To reduce the danger of explosion, never connect or disconnect
charger cables while the charger is operating.
• Fast charging a battery is dangerous and should only be
attempted by a competent technician with the proper equipment.
• Battery acid that may spill during charging should be washed
off with a solution of warm water and baking soda to neutralize
the acid.
0 Note
Never use a fast charger as a booster to start the engine . This will
seriously damage sensitive electronic components, such as control
units, relays, radio, etc ., as well as the battery charger. •
Disconnecting and connecting the battery
When the battery is disconnected some features on the
vehicle will become inoperative and you must reset them
when the battery is reconnected.
When you disconnect the vehicle battery note the following:
• some data stored in the driver information system is erased,
• the clock stops,
• the factory installed radio locks up,
• the engine management system and the one-touch-up and one­
touch -down functions of the power windows no longer work .
After you reconnect the battery, you must reset the following
features :
Inoperative because the
battery was discon­
nected:
clock
one-touch-up and one-touch­
down feature on the power
windows
engine management
seat memory*
radio station coding
Removing battery
To reset after the battery is
reconnected, see:
=> page 14
=> page 67
=> page 135
=> page 100
Sound System Operating Instruc -
tions booklet .
•
Before you check anything in the engine compartment,
always
read and heed all WARNINGS :::> & in "Working in
the engine compartment" on page
273. ~

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-Switch off the ignition and all electrical consumers.
First disconnect the minus cab le (usual ly black or brown) and then
the plus cable (usual ly red). Then remove the battery mounting
bracket and remove the battery. •
Replacing battery
The new battery must have the same specifications and
dimensions as the old one.
A replacement battery must have the same spec ifications and
dimensions as the o riginal equipment battery. Specifications are
listed on the battery housing.
When installing the battery, make sure the ignition and all electrical
consumers are switched off.
0 Note
Make sure the ventilation hose on the side of the battery is
connected, otherwise fumes or battery acid can leak out.
~ For th e sake of th e environm ent
Because of the problem of proper disposal of a battery, we recom­
mend your authorized Audi dealer change the battery for you.
Batteries contain sulfur ic acid and lead and must always be
disposed of properly in compliance with a ll environmenta l regula ­
t ions . Dispos ing of vehic le batteries improperly is very dangerous to
the environment. •
Windshield/headlight washer
container
Using plain water is not adequate for filling the wind­
shield washer system and the headlight washer system*.
i w a, a,
Fig . 21 6 Engin e
co mp artment : Wind ­
s hiel d and head ligh t
w as her f luid contain er
~-~ The washer flu id container is marked with the symbol W on
its cap.
-Before you check a nything in the engine compartmen t,
always read and heed all WARNINGS :::::, & in "Working
in t he engine compartment" on
page 273.
-Lift t he fi ller c ap tongu e to add wash er fluid. You can fil l
the container to the top .
-Press the ca p bac k onto the filler neck a fter fi lling the
container.
You can find the reservoir c a pac ity in the tab le in=> page 343.
Use winterized windshield washer solvent during the cold season
even though the ve hic le is equipped with
h eated wash er jets . It _.,
Vehic le care irechnical data

___ w_ h_ a_t _ d_ o_ l_d _ o_ n_ o_w _ ? ______________________________________________ _
Storing the replaced wheel
- Place the replaced wheel inside the spare wheel well in
the luggage compartment.
- Tighten the knurled retaining screw clockwise to secure
the wheel in place.
- Disengage and lower the floor panel before you close the
luggage compartment lid again.
& WARNING
Loose items in the passenger compartment can cause serious
personal injury during hard braking or in an accident.
• Never store the spare wheel or jack and tools
in the passenger
compartment.
• Always store all jacking equipment, tools, and the spare wheel
in the luggage compartment.
• Tighten the knurled retaining screw for the spare wheel
securely.
[ i] Tips
Check the inflation pressure of the spare tire periodically to keep the
tire ready for use. •
Wheel change
Before changing a wheel
Follow these points for your own and your passenger's
safety when replacing 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) ~& .
-Apply the parking brake firmly ~& .
-Move selector lever to position P on an automatic trans-
mission; put manual transmission in
first gear~& .
-If you are towing a trailer: unhitch the trailer from your
vehicle.
- Take the
tool case and the spare tire ~ page 316 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 flasher 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 roadway and traffic.
• To help prevent the vehicle from moving suddenly and possibly
slipping off the jack, always fully set the parking brake and block
the wheel diagonally opposite the wheel being changed . When one
front wheel is lifted off the ground, placing the Automatic Trans-
~

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/b, WARNING (continued)
• Before you check anything in the engine compartment, always
read and heed all
WARNINGS~ page 265, "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. •
Use of jumper cables
Make sure to connect the jumper cable clamps in exactly
the order described below!
Vehicle with discharged battery:
Fig. 234 Jump­
starting with the
battery of another
vehicle: A -discharged
vehicle battery, B -
booster battery
- Turn off lights and accessories, move lever of automatic
transmission to
N (Neutral) or P (Park) and set parking
brake.
Connect POSITIVE (+) to POSITIVE (+) (red)
1. Connect clamp of plus cable to positive( +) terminal (D
:::> fig. 234 of discharged vehicle battery @.
2. Connect clamp on opposite end of cable to positive(+)
terminal
@ of booster battery ®·
Connect NEGATIVE (-) to NEGATIVE (-) (black)
3. Connect clamp of minus cable (black) to negative (-)
terminal
0 of booster battery®·
Do-it-yourse lf service irechnical data

-Emergency situations PW--------=----=---------------
4. Connect clamp on opposite end of negative cable to the
negative(-) terminal© of the discharged vehicle battery
@.
- 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.
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 exact
reverse order.
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.
& WARNING (continued)
• Before you check anything in the engine compartment, always
read and heed all
WARNINGS:::::, page 265, "Engine compartment".
0 Note
Improperly connected jumper cables can damage or destroy the
generator .
• Always connect POSITIVE (+l to POSITIVE(+), and NEGATIVE (-l to
NEGATIVE (- l terminal.
• 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 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 minus 1-1 cable to the minus (-1 terminal
on the discharged battery @::::, page 331, fig. 234. Instead, securely
connect the minus (-l cable to either a massive metal component
that is firmly bolted to the engine block or to the engine block itself .
If the battery that is being charged does not vent to the outside,
escaping battery gas could ignite and explode! •
Emergency towing with commercial
tow truck
General hints
Your Audi requires special handling for towing.
The following information is to be used by commercial tow truck
operators who know how to operate their equipment safely.
• Never tow your Audi, towing will cause damage to the engine
and transmission. .,_

Emergency situations -
----------------=-=---
Rear hook up
These s te p s app ly fo r w in chi ng the vehi cle on to a car
c arr ier w ith the re a r f ir st.
- Have the vehic le ali gne d cent ered wi th the ca r carr ier
r a mp.
- Attach the win ch hook to t he
rear to wline eye
=> pa ge 334, fig. 237 .
- On ce th e ca r is po sit io ned on t he car ca rrie r, ha ve safety
c hain (s ) a ttach ed t o the
fron t towline eye => pag e 333an d
ti ghte ned .
[ i] Tips
Chec k carefu lly to ma ke sure the veh icle is hoo ked up securel y
b ef ore mov ing the ca r up the ca r ca rrier r amp. •
Lifting the vehicle
Important safety precautions
Be aware of the following hazards before l ift ing the vehic le w ith a
w ork sho p ho is t or f lo or jack :
• The vehicle should never be lifted or jacked up from underneath
the engine oil pan, the transmission housing , the front or rear axle
or the body side members . This could lead to serious damage.
• Use lifting equipment with padded contact surfaces to avoid
damage to the underbody or chassis frame.
• Alternatively, cover the contact surfaces on workshop hoist or
floor ja ck with rubber pads before lifting.
• 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 suffi ­
cient clearance between the hoist and low parts of the vehicle .
& 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
=> fig . 239 and => fig . 240 .
• 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 distri­
bution and balance . This might happen, for example, when heavy
components such as the engine block or transmission are
removed .
• When removing such heavy components, 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 .
•
Do-it -yourself service

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_ i
_ o _ n
__ lllll
W For the sake of the environm ent
By regularly ma intain ing your vehicle, you help make sure that emis ­
sion standards are maintained, thus minimizing adve rse effects on
the e nv ironment. •
Important considerations for you and your
vehicle
T he increasing use of elec tronics, sophisticated fue l injection and
emission con trol systems, and t he gene rally increasing tec hn ical
complexity of today's automobiles, have steadily reduced the scope
of maintenance and repai rs which can be carried ou t by vehic le
owners.
Also , safety and environmental concerns p lace very strict
limits on the nature of repairs and adjustments to engine and trans ­
m iss ion parts whic h an owne r can perform.
Maintenance , adjustments and repairs usua lly require special tools ,
t es ting dev ices a nd othe r eq uipment availab le to s pec ial ly t rai ned
workshop personne l in order to assure proper performance , reli ­
abil ity and safe ty of the vehicle and its many sy stems .
Im proper maintena nce, adjustments and repairs can impa ir the
operation and reliability of your vehicle and even void your vehicle
wa rranty. T here fore, proof o f servic ing in acc orda nce with the main­
tenance schedule may be a condition for upholding a possib le
warranty cla im made with in t he war ran ty per iod .
Above all, operationa l safety can be adversely affected, creating
unnecessary risks for you and your passengers.
I f in doubt about any servicing, have it do ne by your auth orized Audi
dea ler or any other properly equipped and qua lified workshop . We
str ongly u rge y ou to give yo ur auth orized Au di d ealer the oppo rtu ­
n ity to perform all scheduled maintenance and necessary repairs .
Yo ur dealer has the faci lit ies, origi nal par ts an d trained specia lis ts
to keep your vehic le running proper ly.
Controls and equip­ ment Safety first
Vehicle operation
Performing limited maintenan ce yourself
The following pages des cribe a li mi ted numbe r of proced ures wh ic h
can be performed on your vehicle with ordinary tools, should the
need a rise a nd trained pers onnel be unavaila ble. Before perfo rm ing
any of these procedures, a lways t horoughly read all o f the app li­
cable text and carefu lly fo llow the instructions given. Always rigor ­
ously observe the
WARNINGS provided.
Before you check anything in the engine compartment , always read
and heed all
WARNINGS ~ & and~ & in "Wo rking i n th e engine
compartment" on
page 273.
& WARNING
• Serious personal injury may occur as a result of improperly
performed maintenance , adjustments or repairs .
• Always be e xtremely careful when working on the veh icle .
Always follow commonly accepted safety practice s 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
the se or other procedures with respect to the vehicle , or are uncer ­
tain how to pro ceed .
• 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 work shop .
• 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
s uddenly -even when the engine is off and the ignition key has
been removed . The radiator fan swit ches on automat ically when
the coolant reaches a certain temperature and will continue to run
until the coolant temperature drops .
• Alway s remove the ignition key before anyone gets under the
vehi cle .
.,_
Vehicle care Do-it-yourself service Technical data

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&, W ARNING (continued )
• Always support your vehicle with safety stands if it i s neces­
sary to work underneath the vehicle. The jack supplied with the
vehicle is not adequate for this purpose and could collapse
causing serious personal injury .
• If you must work underneath the vehicle with the wheels on
the ground , always make sure the vehicle is on level ground , that
the wheels are always securely blocked and that the engine
cannot be started .
• Always make sure the transmission selector lever (automatic
transmission) is in
" P " (Park position) and the park brake is firmly
applied.
ffi For the sake of the environment
• Changing the engine settings wi ll adverse ly affect emission
l eve ls . T hi s is detri menta l to th e envi ro nm ent and increas es fu el
consumption .
• Always observ e env ironmenta l re gulations w hen disposing of
old e ngine oil, used brake f luid, dirty engine coo lant, spent batteries
or worn out tires .•
Additional accessories,
modifications and parts replacement
Additional accessories and parts
replacement
Alway s co nsult an autho rized Audi de aler before
pu rchasing acc essories .
Your vehicle incorporates t he latest safety d esig n f eatures ensuring
a high standa rd of active and pas sive safety . Th
is saf ety could be compromised by non -approved changes to the
v ehi cle . F or thi s re aso n, if par ts have to be re pla ced , pl ease obs erve
th e fo llow ing points when insta lling add itional acc essories :
A pproved Aud i accesso ries and gen uine Audi pa rts a re avai la bl e
fr om authori zed Aud i dea lers .
Th ese dealers also have the necessary faci lities, tools and tra ined
spec ia li sts to in sta ll th e parts an d acce ssor ies pr op erly .
& WARNING
Using the wrong spare parts or using non -approved accessories
can cause 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 holders on airbag covers or within the airbag deploy­
ment zones . Doing so will increase the risk of injury if airbags are
triggered in an accident!
• Before you check anything in the engine compartment , always
read and heed all WARNINGS
=> page 265.
0 Note
• I f item s ot her than ge nuin e Audi s pa re pa rts, add- on eq uipment
and accessory items are us ed or if r epair wor k is not performed
according to s pecified methods, thi s can re sult in severe damage to
your v ehicle's eng ine and body (suc h as c orros io n) a nd advers ely
affect yo ur vehic le 's wa rranty.
• Th e manufacturer cannot be held liable for damage w hich occurs
d ue t o fa ilur e to comply w it h these stipu lation s.•