2019 AUDI A4 check engine

8W0012721BG
CheckingandFilling

Brakefluid
B8K-2122



Fig.259Enginecompartment:caponbrakefluidreservoir
Observethesafetyprecautions>A\inWorking
intheenginecompartmentonpage309.
Checkingthebrakefluidlevel
>Readthebrakefluidlevelonthebrakefluidres-
ervoir>page311,fig.256.Thebrakefluidlev-
elmustbebetweentheMINandMAXmarkings
>A.
Thebrakefluidlevelismonitoredautomatically.
Changingthebrakefluid
Brakefluidshouldbechangedatregularinter-
vals.Havethebrakefluidchangedby anauthor-
izedAudidealerorauthorizedAudiServiceFacili-
ty.TheauthorizedAudidealerorauthorizedAudi
ServiceFacilitywillinformyouofthereplace-
mentintervals.

ZAWARNING
—IfthebrakefluidlevelisbelowtheMIN
marking,itcanimpair thebrakingeffectand
drivingsafety,whichincreasetheriskofan
accident.Donotcontinuedriving.Seeanau-
thorizedAudidealerorauthorizedAudi
ServiceFacilityforassistance.
—Ifthebrakefluidisold,bubblesmayformin
thebrakesystemduringheavybraking.This
couldimpairbrakingperformanceanddriv-
ingsafety,whichincreasestheriskofanac-
cident.
— Thebrakefluidinyourvehiclemustmeet
thestandardVW50114andisavailableat
anauthorizedAudidealerorauthorizedAu-
diServiceFacility.Ifthisbrakefluidisnot
available,anotherhigh-gradebrakefluidof


equivalentqualitymaybeused,anditmust
meettheU.S.FederalMotorVehicleStand-
ard(FMVSS)116DOT4,Class6.
Q)Note
—IfthebrakefluidlevelisabovetheMAX
marking,brakefluidmayleakoutoverthe
edgeofthereservoirandresultindamage
tothevehicle.
—Donotallowanybrakefluidto comeinto
contactwiththevehiclepaint,becauseit
willcorrodethepaint.

Electricalsystem
Ifthe=orflindicatorlightturnson,thereisa
malfunctioninthegenerator,thebattery, orthe
vehicleelectricalsystem.
=Electricalsystem:malfunction!Safelystop
vehicle
Donotcontinuedrivingandswitchtheengineoff
=>AX.SeeanauthorizedAudidealerorauthorized
AudiServiceFacilityforassistance.
[HlElectricalsystem:malfunction!Restartnot
possible.PleasecontactService
Itwillnot bepossibletorestarttheengineonce
youturnitoff.Vehiclefunctions/drivingstability
maybelimited.DrivetoanauthorizedAudideal-
erorauthorizedAudiServiceFacilityimmediate-
ly.
z=Electricalsystem:malfunction!Pleasecon-
tactService
Switchoffallelectricalequipmentthatisnot
needed.Vehiclefunctions/drivingstabilitymay
belimited.DrivetoanauthorizedAudidealeror
authorizedAudiServiceFacilityimmediately.
z=Electricalsystem:lowbatterycharge.Bat-
tery
willbechargedwhiledriving
Thestartingabilitymaybeimpaired.
Ifthismessageturnsoffafteralittlewhile,the
vehiclebatteryhaschargedenoughwhiledriving.>
317

CheckingandFilling

Ifthismessagedoesnotturnoff,driveimmedi-
atelytoanauthorizedAudidealerorauthorized
AudiServiceFacility.

ZA\WARNING
Whenthereisanelectricalsystemmalfunc-
tion,vehiclefunctionsmaynotworkanddriv-
ingstabilitymaybelimited,whichincreases
theriskofanaccident.Stopdrivingand
switchtheengineoff.SeeanauthorizedAudi
dealerorauthorizedAudiServiceFacilityfor
assistance.

Battery
Prlaameeeelec)
Becauseofthecomplexpowersupply,allworkon
batteriessuchasdisconnecting,replacing,etc.,
should only beperformedby anauthorizedAudi
dealerorauthorizedAudiServiceFacility>A\.
Multiplebatterieswithdifferenttechnologies
maybeinstalledinyourvehicle:
—Vehiclebattery(forexample,forstartingthe
engine,basicpowersupply)>page319,Lead
batteryor>page319,Otherbatterytypes
—Auxiliarybattery(forexample,forrecuperation
oroptionalequipment)>page319,Otherbat-
terytypes
Notrunningthevehicleforlongperiodsof
time
Thebatterywillgraduallydrainifthevehicle
doesnotrunforlongperiodsoftime.Toensure
thatthevehiclecanstillbestarted,theelectrical
equipmentwillbereducedorswitchedoff
=>page143.Someconveniencefunctions,such
asinteriorlightingorpowerseatadjustment,
maynotbeavailableundercertaincircumstan-
ces.Theseconveniencefunctionswillbeavailable
againonceyouswitchtheignitiononandstart
theengine.
Evenwhenelectricalequipmentisswitchedoff,
theequipmentcanstilldrainthebatteryifthe
vehicleisnotdrivenforlongperiodsoftime.
Deepdrainingresultsinachemicalreactionthat
destroys
theinsideofthebattery.Thebattery
318
mustbechargedeverymonthtopreventthis
=page319.Contact anauthorizedAudidealeror
authorizedAudiServiceFacilityformoreinfor-
mation.
Winteroperation
Coldweatherplaceshigherdemandsonthebat-
tery.Thisresultsinreducedstartingability.Have
thebatterycheckedbyanauthorizedAudidealer
orauthorizedAudiServiceFacilitybeforecold
weatherbegins.

Z\WARNING
—Allworkonthebatteryorelectricalsystem
inyourvehiclecanresultininjuries,chemi-
calburns,accidents,or burns.Becauseof
this,allworkmustbeperformedonlybyan
authorizedAudidealerorauthorizedAudi
ServiceFacility.
—Neverconnectthechargingcableorjump
startcabledirectlytoyourvehiclebattery.
Onlyusethe connectionsintheenginecom-
partment>page319.

ZAWARNING
CaliforniaProposition65Warning:
—Batteryposts,terminalsandrelatedacces-
soriescontainleadandleadcompounds,
chemicalsknowntotheStateofCalifornia
tocausecancerandreproductiveproblems.
Washhandsafterhandling.
()Note
—Ifthevehiclewillbe parkedforlongperiods
oftime,protectthebatteryagainstthecold
so thatitwillnot be destroyed by“freezing”
=page319,Chargingthebattery.
—Thereareelectricalcomponentsunderthe
cargofloorbehindatrimpanelthatwarm
upduringoperation.To reducetheriskof
thecomponentsoverheating, donotstore
objectssuchasblanketsunderthecargo
floor.Ifthecomponentsoverheat,theywill
switchofftemporarily.Thiswillbeindicated
byamessagethatwillbedisplayedinthe
instrumentclusteruntilthetemperaturere-
turnstonormal.

8W0012721BG
CheckingandFilling

Leadbattery
Explanationofwarnings:

Alwaysweareyeprotection.

Batteryacidishighlycorrosive.Always
wearprotectiveglovesandeyeprotection.

Fire,sparks,openflame,andsmokingare
forbidden.

A
Ahighlyexplosivemixtureofgasescan
formwhenchargingbatteries.

® ®
Alwayskeepchildrenawayfrombattery
acidandthebattery.

e/
oo

Alwaysfollowtheinstructionsintheoper-
atingmanual.

@

Forthesakeoftheenvironment
¥Donotdisposeofleadbatteriesin
householdtrash.Theycontainharmfulsub-
stances,suchassulfuricacidandlead,andal-
sorecyclablerawmaterials.Contactanau-
thorizedAudidealerorauthorizedAudiServ-
iceFacilityformoreinformation.
oyi1ayh48
Explanationofwarnings:

®
Fire,sparks,openflame,andsmokingare
forbidden.

®
Alwayskeepchildrenawayfrombattery
acidandthebattery.

@/
faa)

Alwaysfollowtheinstructionsintheoper-
atingmanual.


Havetheaffectedareaexaminedbyamedi-

calprofessional.


ZN
-Th

Allworkonthebatteriesmustonlybeper-
formedbyanauthorizedAudidealerorau-
thorizedAudiServiceFacility.
—Gasesthatescapefromthesedifferentbat-
terytypescanbepoisonousorflammable.
corrosive.Ifanybatterycontentscomeinto
contactwiththeskin,flushtheaffected
areaforatleast15minuteswithcleanwa-
ter.Thenwashtheaffectedareawithsoap.
WARNING
econtentsofthesebatterytypescanbe

()Note
Components mustnot beconnectedtothe
batteryterminalsandwiresonthesebattery
typesbecausethisincreasestheriskofdam-
age,forexampleduetoovervoltage.
@)Forthesakeoftheenvironment

iesinhouseholdtrash.Theycontainharmful
substancesandrecyclablerawmaterials.Con-
tactanauthorizedAudidealerorauthorized
AudiServiceFacilityformoreinformation.
Chargingthebattery

Fig.260Enginecompartment:connectorsforachargeror
jumpstartcables
Notethesafetyprecautions>page309,Work-
ingintheenginecompartment,>/\inBattery
generalinformationonpage318and>/\.
Requirement:onlyusechargers withamaximum
chargingcurrentof14.8volts.Thebatteryca-
blesremainconnected.
>Switchofftheignitionandallelectricalequip-
ment.
>Openthehood>page310.
>Opentheredcoveronthepositiveterminal
>fig.260.
>Clampthechargerterminalclampstothejump
startpinsaccordingtotheinstructions.(pinun-
der thecover=“positive”,pinwithhexagonal
head=“negative”).
>Insertthepowercableforthechargingdevice
intothesocketandswitchthedeviceon.
319
XXDonotdisposeofthesetypesofbatter-
>

CheckingandFilling

>Attheendofthechargingprocess,switchthe
chargeroffandpullthepowercableoutofthe
socket.
>Removethechargingdeviceterminalclamps.
>Closetheredcoveronthepositiveterminal.
>Closethehood>page310.

ZXWARNING
—Neverconnectthechargingcabledirectlyto
yourvehiclebattery.Onlyuse the connec-
tionsintheenginecompartment
=>page319.
—Ahighlyexplosivemixtureofgasescanform
whenchargingbatteries.Onlychargethe
batteryinwell-ventilatedareas.
—Adrainedbatterycanfreezeattempera-
turesaround329F(02C).Donotchargeor
useafrozenorthawedbattery.If iceforms,
thebatteryhousingcancrackandbattery
electrolytecanleakout,whichincreasesthe
riskofanexplosionandchemicalburns.
Contact anauthorizedAudidealerorauthor-
izedAudiServiceFacilityformoreinforma-
tion.
—Donotconnectordisconnectthecharging
cablewhilechargingbecausethisincreases
theriskofanexplosion.

@)Tips
Readallofthemanufacturer'sinstructions
forthechargerbeforechargingthebattery.
Windshieldwasher
system

B8W-0125



Fig.261Enginecompartment:washerfluidreservoircap
ThewindshieldwasherfluidreservoirScontains
thecleaningsolutionforthewindshieldandthe
320
headlightwashersystem*>page311,fig.256.
Thereservoircapacitycanbefoundin
=>page373.
Toreducetheriskoflimescaledepositsonthe
spraynozzles,usecleanwaterwithlowamounts
ofcalcium.Alwaysaddwindowcleanertothewa-
ter.Whentheoutsidetemperaturesarecold,an
anti-freezingagentshould beaddedtothewater
sothatitdoesnotfreeze.
C)Note
— Theconcentrationofanti-freezingagent
mustbeadjustedtothevehicleoperating
conditionsandtheclimate.Aconcentration
thatistoohighcanleadtovehicledamage.
—Neveraddradiatoranti-freezeorotheraddi-
tivestothewasherfluid.
—Donotuseaglasscleanerthat contains
paintsolvents,becausethiscoulddamage
thepaint.
Serviceintervaldisplay
Theserviceintervaldisplaydetectswhenyourve-
hicleisdueforservice.
Checkingserviceintervals
Youcan checktheremainingdistanceortimeun-
tilthenextoilchangeornextinspectioninthe
Infotainmentsystem.

>SelectintheInfotainmentsystem:the[MENU
button>Vehicle>leftcontrolbutton>Service
&checks>Serviceintervals.

Resettingtheindicator
AnauthorizedAudidealerorauthorizedAudi
ServiceFacilitywillresettheserviceintervaldis-
playafterperformingservice.
Ifyouhavechangedtheoilyourself,youmustre-
settheoilchangeinterval.

>SelectintheInfotainmentsystem:the|MENU
button>Vehicle>leftcontrolbutton>Service
&checks>Serviceintervals>Resetoilchange
interval.

8W0012721BG
CheckingandFilling

Ifanoilchangeorinspectionisdue,youcanac-
cessitintheInfotainmentsystem.Thedisplay
worksintwostages:
—Servicereminder:afteracertaindistanceis
driven,amessageappearsintheinstrument
clusterdisplayeverytimetheignitionisswitch-
edon.Theremainingdistanceandtimeisdis-
playedbriefly.
—Servicedue:ifyourvehiclehasreachedaserv-
iceinterval,amessageappearsbrieflyafter
switchingtheignitionon.
()Note
—Onlyresettheoilchangeindicatoriftheoil
waschanged.
—Followingtheserviceintervalsiscriticalto
maintainingtheservicelifeandvalueof
yourvehicle,especiallytheengine.Evenif
themileageonthevehicleislow,donotex-
ceed thetimeforthenextservice.
321

8W0012721BG
Emergencyassistance


—Toreducetheriskofanaccident,neverstart
theenginewhenthevehicleisraised.
—Toreducetheriskofinjury,supportthevehi-
clesecurelywithsuitablestandsifworkisto
beperformedunderneaththevehicle.

ZAWARNING
Tohelppreventinjurytoyourselfandyour
passengers:
—Donotraisethevehicleuntilyouaresure
thejack*issecurelyengaged.
—Passengersmustnotremaininthevehicle
whenitisjackedup.
—Makesurethatpassengerswaitinasafe
place
awayfromthevehicleandwellaway
fromtheroadandtraffic.
—Makesurejackpositioniscorrect,adjustas
necessaryandthencontinuetoraisethe
jack*.
—Ifworkhastobedoneunderthevehicle,en-
surethatitissafelysupportedonsuitable
stands-riskofinjury!
—Neverstarttheenginewhenthevehicleis
onthejack*-riskofaccident!




@)Note
Donotliftthevehiclebythesill.Positionthe
vehiclejack*onlyatthedesignatedmounting
pointsonthesidesill.Otherwise,yourvehicle
couldbedamaged.
Removingandinstallingawheel
@RgTt
“ooO

m™
Fig.274Wheel:internalhexsocket to turnthewheelbolts

5is+
~%0a
Fig.275Wheel:alignmentpininthetophole
Removingawheel
>Removethetopwheelboltcompletelyusing
thehexsocketinthescrewdriverhandlefrom
thevehicletoolkit>fig.274andplaceitona
cleansurface.
>Theninstallthealignmentpinfromthevehicle
toolkitintheemptywheelboltholebyhand
>fig.275.
>Removetherestofthewheelbolts.
>Removethewheel>().Thealignmentpinre-
mainsintheholewhiledoingthis.
Installingawheel
Readthedirectionsonpage354wheninstal-
lingunidirectionaltires.
>Slidethewheelonoverthealignmentpin>@.
>Installthewheelboltsandtightenthemgently
usingthehexsocket.
>Removethealignmentpinandtightenthere-
mainingwheelbolt.
>Carefullylowerthevehicleusingthevehicle
jack*.
»
Tightenthewheelboltsinadiagonalpattern
usingthewheelwrench.
Thewheelboltsmustbecleanandloosenand
tighteneasily.Checkthecontactsurfacesforthe
wheelandhub.Contaminantsonthesesurfaces
mustberemovedbeforeinstallingthewheel.

Z\WARNING
Neverusethehexsocketinthescrewdriver
handleorthehexsocketwrenchwiththe
ratchettoloosenortightenthewheelbolts.
This increasestheriskofanaccident,because
youwillnot beabletoachievethecorrect
tighteningspecification.>


353

Emergencysituations

Emergencysituations
General
Thischapterisintendedfortrainedemergency
crewsandworkingpersonnelwhohavethenec-
essarytoolsandequipmenttoperformthese
operations.
Startingbypushingor
towing
@)Note
Vehicleswithanautomatictransmission
cannotbestartedbypushingortowing.
Startingwithjumper
cables
Ifnecessary,theenginecanbestartedbycon-
nectingittothebatteryofanothervehicle.
Iftheengineshouldfailtostartbecauseofadis-
chargedorweakbattery,thebatterycanbecon-
nectedtothebatteryofanothervehicle,usinga
pairofjumpercablestostarttheengine.
Jumpercables
Useonlyjumpercablesofsufficientlylargecross
sectiontocarrythestartercurrentsafely.Refer
tothemanufacturer'sspecifications.
Useonlyjumpercableswithinsulatedterminal
clampswhicharedistinctlymarked:
plus(+)cableinmostcasescoloredred
minus(-)cableinmostcasescoloredblack.


creasestheriskofanexplosionandchemi-
calburns.Afterjumpstartingthevehicle,
drivetoanauthorizedAudidealerorauthor-
izedAudiServiceFacilityimmediatelyto
havethevehiclebatterychecked.
—Donotallowbatteryacidtocontacteyesor
skin.Flushanycontactedareawithwater
immediately.
—Improperuseofaboosterbatterytostarta
vehiclemaycause anexplosion.
—Vehiclebatteriesgenerateexplosivegases.
Keepsparks,flameandlightedcigarettes
awayfrombatteries.
—Donottrytojumpstartanyvehiclewitha
lowacidlevelinthebattery.
— Thevoltageoftheboosterbatterymustalso
havea12-Voltrating.Thecapacity(Ah)of
the boosterbatteryshouldnotbelower
thanthatofthedischargedbattery.Useof
batteriesofdifferentvoltageorsubstantial-
lydifferent“Ah”ratingmaycause anexplo-
sionandpersonalinjury.
—Neverchargeafrozenbattery.Gastrapped
intheicemaycause anexplosion.
—Neverchargeoruseabatterythathasbeen
frozen.Thebatterycasemayhave beweak-
ened.
—Useofbatteriesofdifferentvoltageorsub-
stantiallydifferentcapacity(Ah)ratingmay
causeanexplosionandinjury.Thecapacity
(Ah)oftheboosterbatteryshouldnot be
lowerthanthatofthedischargedbattery.
—Beforeyoucheckanythingintheengine
compartment,alwaysreadandheedall
WARNINGS&page309.


Z\WARNING
Batteriescontainelectricity,acid,andgas.
Anyofthese cancauseveryseriousorfatalin-
jury.Followtheinstructionsbelowforsafe
handlingofyourvehicle’sbattery.
—Alwaysshieldyoureyesandavoidleaning
overthebatterywheneverpossible.
—Adeadbatterycanfreezeattemperatures
around
32°F(0°C).Ifthevehiclebatteryis
frozen,youmustthawitbeforeconnecting
thejumpstartcables.Ifyoudonot,thisin-

362
C)Note
—Applyingahighervoltageboosterbattery
willcauseexpensivedamagetosensitive
electroniccomponents,suchascontrol
units,relays,radio,etc.
—Theremustbe noelectricalcontactbetween
thevehiclesasotherwisecurrentcouldal-
readystarttoflowassoonasthepositive
(+)terminalsareconnected.

Emergencysituations


—Jumpercables mustbelongenoughsothat
thevehiclesdonottouch.
—Whenconnectingjumpercables,makesure
thattheycannotgetcaughtinanymoving
partsintheenginecompartment.
—Donotbendoverthebatteries-dangerof
chemicalburns!
—Thebatterycelllockingscrewsmustbe
tightenedsecurely.
—Beforeyoucheckanythingintheengine
compartment,alwaysreadandheedall

WARNINGS>page309.

@Note
Improperhook-upofjumpercablescanruin
thegenerator.
—AlwaysconnectPOSITIVE(+)toPOSITIVE
(+),andNEGATIVE(-)toNEGATIVE(-)
groundpostofthebatterymanagercontrol
unit.
—Checkthatallscrewplugsonthebattery
cellsarescrewedinfirmly.Ifnot,tighten
plugspriortoconnectingclamponnegative
batteryterminal.
—Pleasenotethattheprocedureforconnect-
ingajumpercableasdescribedaboveap-
pliesspecificallytothecaseofyourvehicle
beingjumpstarted.Whenyouaregivinga
jumpstarttoanothervehicle,donotcon-
nect
thenegative(-)cabletothenegative
(-)terminalonthedischargedbattery@)
>fig.283.Instead,securelyconnectthe
negative(-)cabletoeitherasolidmetal
componentthatisfirmlyboltedtotheen-
gineblockortotheengineblockitself.If
thebatterythatisbeingchargeddoesnot
vent
totheoutside,escapingbatterygas
couldigniteandexplode!
Towingwithatowtruck
Generalhints
YourAudirequires specialhandlingfortowing.
Thefollowinginformationistobeusedbycom-
mercialtowtruckoperatorswhoknowhowtoop-
eratetheirequipmentsafely.
364
—NevertowyourAudi,towingwillcausedam-
agetotheengineandtransmission.
—Neverwrapthesafetychainsorwinchcables
aroundthebrakelines.
—Topreventunnecessarydamage,yourAudi
mustbetransportedwithaflatbedtruck.
—Toloadthevehicleontotheflatbed,use the
towingloopfoundinthevehicletoolsandat-
tachtothefrontorrearanchorage>page364
and>page365.

ZXWARNING
Avehiclebeingtowedisnotsafeforpassen-
gers.Neverallowanyonetorideinavehicle
beingtowed,foranyreason.
Fronttowingloop
Onlyinstallthefronttowingloopwhenitis
needed.




Fig.284Frontbumper:installingthetowingloop
Thethreadedopeningforthetowingloopislo-
catedontherightsideofthefrontbumper.
»Removethetowingloopfromthevehicletool
kit>page348.
>Pressthecap inwardwithbrief,strong pressure
=> fig.284.Thecapwillloosenfromthebump-
er.
>Tightenthetowingloopinthethreadedopen-
inguntilitstopsandthentightenitwitha
wheelwrench.
>Afterusing,placethetowingloopbackinthe
vehicletoolkit.

ZA\WARNING
Ifthetowingloopisnottighteneduntilit
stopswheninstalling,thethreadsmaybe>