2008 AUDI A4 AVANT catalytic converter

You can switch off the open-door-or-lid warning display by briefly pressing the On Board computer control
but tons => page 39. The
open door or trunk warn ing will, however, illuminate again as soon
as there is a change in the position of the doors, engine hood or
trunk lid. •
On-Board Diagnostic system (OBD)
Malfunction Indicator Lamp (MIL) (USA
models) / (Canada models)
The Malfunction Indicator Lamp (MIU in the instrument cluster
=> page 19, fig. 9 is part of the On -Board Diagnostic (OBD II) system.
The warning/indicator light il luminates when the ignition is
switched on and goes out after the engine starts and the idle has
stabi lized . This indicates that the MIL is working prope rly.
If the light do es not go out after the engine is started, or illuminates
while you are driving, a malfunction may exist in the engine system.
If the light starts flashing, the catalytic converter could be damaged .
Continue driving
w ith redu ced pow er (avoiding sustained high
speeds and/or rapid accelerations) and have the condition
corrected. Contact your authorized Audi dealer.
If the light illuminates, the e lectronic speed limiter may also be
malfunctioning . For more
information=> page 28, "Electronic speed
limiter".
An impr operly c lo se d fuel filler cap may al so cau se th e MIL l amp to
illumi nate
=> page 269. •
Controls and equip ­
ment
Dri ver inf orma tio n di spl ay
On -Board Diagnostics
F ig. 15 Locatio n of
Da ta Li nk Co nnecto r
( DL Cl
On-Board Diagnostics monitors the components of your emission
control system . Each control led component in your engine system
has been assigned a code. In case of a malfunction, the component
wil l be identified and the fault stored as a code in the control
modu le memory.
The M IL lamp may a lso illuminate if there is a leak in the on-board
fuel vapor recovery system. If the light illuminates after a refuelling,
pull off the road and stop the vehicle, then check that the fuel fi ller
cap is proper ly closed
=> page 269.
In order to make an accurate diagnosis, the stored data can only be
displayed using special diagnos tic equipment (generic scan tool for
OBD).
In order to connect the special diagnostic equipment, push the plug
into the Data Link Connector (DLC). The DLC is located to the right of
the engine hood release
lever => fig. 15 .
Your author ized Audi dealer or a qua lified service station can inter­
pre t the code and perform the necessary repair. •
irechnical data

_______________________________________________________ T:...:.; ra::.:.. n:.:s:.: m
:..:.:.:.: is::::s::.:.: io::.:.. n:__JIIII
Select R only when the vehicle is at a full stop and the engine is
running at idle
speed.~ & in "Driving the 6 -speed automatic trans ­
mission" on
page 143.
Before you move the selector lever to R, press both, the button in the
handle of the selector lever
and the brake peda l at the same time.
When the ignition is on, the backup lights i lluminate when the
selector lever is moved into R.
N -Neutral
Shift to this position for standing with brakes applied ~ page 145.
When the vehicle is stationary or at speeds below 3 mph (5 km/h),
you must always apply the footbrake before and while moving the
lever out of
N.
D -Normal driving position for forward
Position Dis for norma l city and highway driving. It ranges from zero
to top speed and all six gears automatically shift, depending on
engine load, driving speed and automatically selected shift
programs.
When the vehicle is stationary or at speeds below 3 mph (5 km/h),
you must always apply the foot brake before and whi le moving the
lever out of
N to D or S.
In certain circumstances it may be advantageous to temporarily
switch to the manual shift program to manually se lect gear ratios to
match specific driving
conditions~ page 147.
S -Sport position
Selec t this position for sportier performance. In this position, the
eng ine wi ll not upshift as soon, allowing the vehic le to use the
increased power avai lable at higher engine speeds to achieve live­
lier acceleration.
Before you move the selector lever from
D to S, press the button in
the handle of the selector lever.
Controls and equip ­
ment
LJ}. WARNING
• Always read and heed WARNINGS ~ & in "D riving the 6-speed
automatic transmission" on
page 143.
0 Note
Coasting downhill with the transmission in N and the engine not
operating will result in damage to the automatic transmission and
possibly the catalytic converter. •
Applie s to vehicles: wi th G·sp eed automatic tra nsm iss ion
Automatic Shift Lock (ASL )
Automatic selector lever lock prevents you from acciden ­
tally shifting into a forward gear or into reverse , thus
causing the vehicle to move unintentionally.
Fig. 149 Shift gate:
selector lever lock
positions and interlock
button highlighted
The selector lever lock is re lease d as follows:
-Turn on the ignition .
irechnical data

-
Transmission
----------------
Select R only when the vehicle is at a full stop and the engine is
running at idle
speed~ & in "Driving the multitronic™" on
page 750.
Before you move the selector lever to R, press both, the button in the
handle of the selector lever
and the brake pedal at the same time.
When the ignition is on, the backup lights illuminate when the selector lever is moved into R.
N -Neutral
Shift to this position for standing with brakes applied ~ page 152.
When the vehicle is stationary or at speeds below 3 mph (5 km/h),
you must always apply the footbrake before and while moving the
lever out of
N .
Do not use N for coasting downhill.
D -Normal driving position for forward
Depending on the load on the engine, vehicle speed and the
dynamic control program, the transmission will select the
optimal
gear ratio.
In certain circumstances it may be advantageous to temporarily
switch to the manual shift program to manually select gear ratios to
match specific driving
conditions ~ page 154.
When the vehicle is stationary or at speeds below 3 mph (5 km/h),
you must always apply the footbrake before and while moving the
lever to
D out of N.
S -Sport position
Select this position for sportier performance. In this position, the
transmission will not upshift as soon, allowing the vehicle to use
the increased power available at higher engine speeds to achieve livelier acceleration.
Before you move the selector lever from
D to S, press the button in
the handle of the selector lever. When the vehicle is stationary or at speeds below 3 mph (5 km/h),
you must always apply the foot brake before and while moving the
lever to
S out of N.
& WARNING
Read and follow all WARNINGS ~ & in "Driving the multitronic™"
on
page 150.
0 Note
Coasting downhill with the transmission in N and the engine not
operating will result in damage to the automatic transmission and
possibly the catalytic converter. •
Applies to vehi cles : wi th mu ltitroni c'" Continuous ly Variable Transm ission (CVT )
Automatic Shift Lock (ASL )
The Automatic Shift Lock safeguards you against acciden ­
tally shifting into a forward or the reverse gear and
causing the vehicle to move unintentionally.
~ M -w a, .,
Fig. 155 Shift gate:
selector lever lock
positions and interlock
button highlighted
..

llffll.,__ __ D_r_ iv _ in_.... g,_ a_n_ d __ e_n _v_ ir_o_ n_ m_ e_n_ t _____________________________________________ _
New brake pads
Remember that new brake pads do not have a full braking
effec t during the first 250 miles (400 kilometers) after they
are i nstalled .
New brake pads have to be "burn ished in" befo re they have opti mal
grab =>& .
During the break -in period, you s hou ld avo id putti ng severe loads
on the brakes . Severe loads include, for examp le, sudden hard
braking, in particular at very h igh speeds or, for example, on moun ­
t ain passes .
& WARNING
New brake p ad s don't h ave th e be st sto pping p ower a nd mu st b e
" brok en -in " durin g th e initial 100 to 1 50 mil es (150 t o 200 kil ome ­
t e rs) of norm al cit y dri ving . You can comp en sa te for thi s by
pr ess ing the brak e ped al mor e firmly . Thi s al so appli es later when
ne w pad s a re in sta lled. •
Catalytic converter
It is very important that your emission control sys tem
(catalytic conver ter) is functioning properly to ensure that
y o ur vehicle is running in an environmentally sound
manner.
-Always use lead-free gasoline => page 267, "Fuel supply".
-Never run the tank down a ll the way to empty.
-Never put too much motor o il in your engine => page 278,
"Add ing eng ine oil -Neve r try to push -or tow -s ta rt yo ur vehic le.
The catalytic converter is an efficient "clean-up " device built into the
exhaust system of the vehicle. The catalyt ic converter burns many
of the po llutants in the exhaust gas before they are released into the
atmosphere.
T he exc lusive use o f un leaded fue l is critica lly important for the l ife
of the catalytic converter and proper functioning of the engine.
& WARNING
• Do not park or operate th e veh icle in ar eas wh ere the hot
ex hau st sys tem m ay come in contac t w ith dr y gra ss, bru sh , fuel
s pill or other material which can cau se a fire .
• Do not appl y additi ona l under coating or ru stpr oofing on or
ne ar the e xhau st m anifol d, ex haust pipe s, ca ta lytic converter or
he at shield s. Du ring dri ving , the sub sta nce u sed f or under coating
c ould overhe at and cau se a fir e.
0 Note
• Be aware that just one tank filling with leaded fue l wi ll already
ser iously degrade the performance of the catalyt ic converter.
• Do not exceed the correct engine oi l
level=> page 278.
• Do not drive until the fuel tank becomes comp letely empty . The
engine could misfire . Unburned fuel could also get into the exhaust
system and this could cause the catalytic conver ter to overheat .
• Do not turn off the ignition wh ile the vehicle is moving.
• Do not continue to operate your vehicle under these conditions,
as otherwise fuel can reach the cata lyt ic converter . This cou ld result
in overheating of the converter, requiring its rep lacement .
• To assure eff icient operat ion of the Em iss ion Control System:
- Have your vehicle maintained properly and in accordance with
the service recommendations in your Maintenance
& Warranty
booklet.
..,

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The engine and catalytic converter have to reach their optimal oper ­
at ing te mpera tur e to reduce fuel consumption and noxious emis ­
sions effective ly .
Just after starting, a cold engine in a mid -size car only achieves a
f ue l economy of 6-8 miles per ga llon (30-401/100 km). After about a
half a mile, fue l economy climbs to 12 mpg (201/100 km). After about
2.5 m iles (4 km), the engine is at its proper operat ing temperature
and fuel economy has reached a normal level. So you can see that
you should avo id short tr ips whenever poss ib le .
The outsi de te mp eratur e is also critical in this regard . Your car
consumes more fuel in the winter than in the summer. •
Controls and equip­ ment Safety first Vehicle operation
Vehicle care Do-it-yourself service Technical data

Fuel supply and filling your fuel tank
Gasoline
Fuel supply
Using the right fuel helps keep the environment clean and
prevents engine damage.
F u el re comm end ati on
The fuel recommended for your vehic le is unle ad ed pr em ium grade
gaso line . See
a lso => page 343, "Data". Audi recommends using TOP
TIER Detergent Gaso line with a minimum octane rating of 91 AKI (95
RON). For more informat ion on TOP TIER Detergent Gaso line, p lease
go to the official website (www .toptiergas .com) .
The recommended gasoline octane rating for your engine can also be found on a label located on the ins ide of the fuel fi ller flap. This
rating may be specified as A KI o r RON .
Your vehicle may also be operated us ing u nleaded regular gasoline
with a minimum octane rating of 87 AKl/91 RO N. However, using 87
A Kl/9 1 RON octane fuel w ill sl ight ly reduce engine performance.
U se unleaded gasoline only. Unleaded gaso line is avai lable
throughout the USA, Canada, and in most European countries. We
recommend that you do not take your vehicle to areas or countr ies
where un leaded gasoline may not be available .
For more informati on on refueling yo ur vehicle,
see => page 268 .
Octan e ra ting
Octane rating indicates a gaso line's abil ity to res ist engine
damaging
" k nock" caused by premature ign ition and detonation.
Therefore, buying t he correct grade of gasoline is very i mpo rtant to
help prevent possible engine damage and a loss of engine perfor ­
mance.
Fu el supply and fillin g your fu el tank
Gasol ine most common ly used in the Un ited States and Canada has
the fo llowing octane ratings that can usua lly be found on the filler
pump :
• Premium Grade : 91 - 96 AKI
• Regu lar Grade: 87 -90 AKI
Explanation of t he abbrev iat ions:
AKI = Anti Knock Index= (R +Ml/2 = (RO N+MON)/2
RO N= R esearc h Octane Num ber
MON = M otor Octane Number .
0 Note
• Do n ot use any fue l with octane ratings l ower than 87 AKI o r 91
RO N otherwise expensive engine damage wi ll occur.
• Do
not use leaded gasoline! The use of leaded gaso line wi ll
severe ly damage your vehic le's catalytic converter and its abi lity to
co ntr ol exhaus t em issions. •
Blended gasoline
Use of ga soline containing alcohol or MTBE (m ethyl
tert iary but yl ether )
You may use unleaded gaso line blended with alcohol or MTBE
(commonly referred to as oxygenates) if the blended mixture meets
the fo llow ing criteria:
Blend of ga soline meth anol (wood alcohol or methyl alc ohol)
• Anti-knock index must be 87 AKI or higher .
• Blend must contain no more than 3% methanol.
• Blend must contain more than 2% co-solvents.
Vehicle care

Alph ab eti ca l ind ex -
-------------=----
AUTO
Climate controls ...... .... ...... .. 127
Switching on .................... 127
When should I use AUTO? ......... 127
Auto Safety Hotline ................. . 175
Auto-C heck Contro l ...... .... ... .... .. 28
Au toma tic transmission ...... .... .. 30
Manua l transmission .. ...... .... .. 29
Automa tic a ir recircu lation ........... 129
Automatic belt retractor .......... .... 181
Automat ic car was h
See Washing ...... .... ... .... .... 255
Automatic headlight control ........... 73
Automatic Sh ift Lock (ASU .. ..... 145, 152
Automatic transmission 6-speed automatic transmission 143, 144
Ign it ion key safety lock . ...... .... . 136
Shift but tons .. ...... .... .... 148, 155
Steering wheel wit h tiptronic® . 148,155
See also mu ltit ronic™ ... .. ...... .. 149
Automat ic trans mission (6 -speed)
Automat ic Shift Lock (ASU ... .. ... . 145
Driving .. .. .. .... .... ..... .. .... 1 43
Dynamic shift program ... .... .... . 146
Fa il- safe mode . ...... .... .... .... 149
Kic k-down ... .... .... .... ... .... . 146
Manual shift program (tiptronic®) .. 147
Average speed ....................... 41
Avoid damaging the vehicle .. ...... .. 245
Controls and equip­
ment Safety first
B
Battery .....
.... .... .... .... ... 285, 288
Battery location ins ide the eng ine
compartment .. ...... .... .... ... 285
Charging . ............ ........... 289
Checking battery acid level . ........ 288
Connecting .... .. ..... .... .... ... 290
Disconnecting ............ .... ... 290
Important warnings when working on the
battery ... .. .... .... .... .... ... 286
Removing the battery ... .. .... .... 290
Replacing the battery ............. 29 1
Winter operation . ................ 285
Working on the battery ............ 286
Bat tery vo ltage .. ... ... .... .... .... .. 35
Before driving ...................... 167
Blended gasoline . .... ............... 267
Body cavity sealing ...... .... .... ... . 260
Booster seats .......... .... .... ..... 218
How do I properly instal l a booster seat in
my vehicle? ... .. .... .... .... ... 218
Safety inst ructions ... .. .... .... ... 218
Brake assista nt ..... .... .... .... .... 241
Brake booster .......... ...... .... ... 240
Brake f luid
Changing the brake flu id ...... .... 284
Check ing the brake fluid leve l ...... 284
Reservoi r .... .... .... ..... .. .... . 28 4
What is the correct brake f luid level? 284
What shou ld I do if
t he brake fluid warning
l igh t comes on? ... .. .... .... .... 284 Brake system
...... .... .... .... .. 31,284
Anti -lock Brake System (ABS) ........ 21
Brake fluid ....................... 284
Brake f lu id spec ificat ions for refi ll and
replacement ..... .... .... .... ... 28 4
Brake pads ...................... 244
Warning/indicator lights ...... ...... 23
Brakes ...... .... .... .... ... .... .... 239
Adverse cond itions affec ting bra ke
performance ...... .... .... ..... 239
Break -in period ....... ........ ...... 243
Brake pads ........... .... .... ... 244
Tires .. .... ....... .... ...... ..... 243
Bu lbs .. ...... .... .... ... .... .... ... 328
C
Ca lif o rnia Pr opo sit ion 65 War ning ... .. 274
Batte ry specific . ...... .... .... .... 287
Capacities .......................... 343
Car care . .... .... ........... .... .... 254
Interior .... ... .... .... .... .... ... 261
Plastic and vinyl .... ............. . 258
Weatherstrips .... ... .. ...... .... . 259
Ca re of exterior ..... .... .... .... .... 254
Care, service and disposal Safety belt tensioner .............. 186
Cargo area
See Loading the luggage compartment .
173
Cargo net .......................... 108
Catalytic converter ...... .... .... .... 24 4
Vehicle operation Vehicle care Do-it-yourself service Technical data

___ A_l-=- p _h_ a_ b_e _t_ic _ a_l _in _ d_e _x ____________________________________________ _
Starting .. .. .. ...... .... .... 135, 136
Starting with jumper cables ... .... 330
Stopping . .... .... .... ... .... ... 137
Engine compartment ... .. .... .... ... 274
Safety instructions . . . . . . . . . . . . . . . 273
Working the engine compartment .. 273
Engine coolant system . ...... ...... . 280
Adding coolant .. ...... .......... 282
Checking coo lant leve l .. .. .... .... 281
Checking the engine coo lant leve l .. 281
Radiator fan . . . . . . . . . . . . . . . . . . . . . 283
Engine coolant temperature Gauge ...... ...... .... ........... 13
Engine cooling system Ma lfunction .. .... ..... .. .... .... . 31
Engine data ...... .... .... .......... 343
Engine hood Closing . ...... ..... .. .... ...... . 273
How to release the hood . . . . . . . . . . 272
Engine oil ...... .... .... .... ... .... 275
Adding ... .... ... .... .... ...... . 278
Additives . . . . . . . . . . . . . . . . . . . . . . . 278
Changing ... .. .... .... ...... .... 279
Checking the engine oi l level .. .... . 277
Indications and conditions requiring extra
checking ..... .. .... .... ... .... 277
Oil consumption .. .... .... ... .... 277
Oil grades . . . . . . . . . . . . . . . . . . . . . . . 275
Recommended o il check interva ls .. 277
Specification and viscosity . . . . . . . . 275
Engine oil level .. .... .... .... ... .... . 34
Engine oil pressure Malfunction ...... ..... .. .... .... . 32 Engine oil sensor defective
....... .... . 34
Environment Break -in period .. ...... .... .... .. 243
Catalytic converter .. ...... .... ... 244
Disposing of your vehicle battery ... 291
Driving at high speeds .. .... .... .. 245
Driving to minimize pollution and noise . 245
Fuel ... ...... .... ... .. .... .... .. 269
Fuel economy ....... ...... .... .. 245
Leaks under your vehicle ... .... ... 273
Letting the vehicle stand and warm up .. 246
Proper disposa l of drained brake fluid
284
Proper disposal of drained engine
coo lant ...... ............. ..... 282
Proper disposa l of drained engine oil
278 ,279
Recycling used eng ine oil .. .... ... 278
Un leaded fuel ..... .... ... .... ... 267
What should I do with an old battery?
291
EPC
See Electronic power control .. ... .. . 23
ESP
See Electronic stabi ll ization program
(ESP) . ... .... .... ........ ... 22, 236
Event Data Recorder (EDR) .. ....... .. 236
Expansion tank .. .... ... .... .... .... 281
F
Fahrenheit
Switching between Fahrenheit and Centigrade . ...... .... ...... .... 128
Fan Adjusting the fan speed .. ...... ... 129
Climate controls ................. 129
Radiator ...... .... .... ...... .... 283
Fastening eyes ... .... .... .... .... .. 108
Flat tire ............................. 50
Changing .. .... .... ... .... .... .. 318
Flat tire changing .. ...... .... .... .... 50
Floor mats .. ... ... .... .... .... .... . 172
Fog lights ........................... 76
Fo lding master key with remote control . 52
Foot pedals .. .. .. .... .... .... ...... 17 2
For the sake of the environment Gaso line fumes and the environment 269
Letting your engine warm up ....... 136
Reducing engine noise by early upshifting .... .... ... .... .... ... 13
Reducing engine noise by upshift ing
early . .... .... .... ... .... .... ... 13
Refueling .... .... .... ....... .... 269
Saving fuel by early upshifting . .... . 13
Saving fuel by upshifting early .. .... 13
Using the rear window defogger 131, 132
Front airbags
Description . .... .... ... .... .... .. 191
How they work .. .... ... .... .... .. 196
Front ashtray . . . . . . . . . . . . . . . . . . . . . . . 119
Front fog lights .... .... .... .... .... .. 76