check engine AUDI A4 2018 User Guide

Driving
-The driver's door must be closed, the driver's
safety belt must be fastened, and the brake peda l (automat ic transmission) or the clutch
pedal (manua l transmission) must be pressed.
Or:
-The driver's door must be closed, the brake
pedal (automat ic transmission) or the clutch
pedal (manua l transmission) must be pressed,
and a gear must be engaged.
(D Note
Always sw itch the Start/Stop system off when
driving through water
q page 85.
@ Tips
The engine stops shortly before the vehicle
comes to a stop
1) .
Stopping/starting the engine
Appl ies to: ve hicl es w ith Sta rt/Stop system
F ig . 95 Instrument cluste r: e ng ine sw itched off (stop
phase)
A ppl ies to: ve hicles w ith manu al transmiss ion
• When the vehicle is stat ionary, shift to neut ral
and release the clutch pedal. The eng ine will
switch off . The
II indicator light appears in the
information line at the bottom of the instru­
ment cluster d isp lay. The needle in the tachom­
eter also moves into the
R EADY position .
• The engine will resta rt if you press the clutch
pedal. The ind icator light turns off.
A ppl ies to: ve hicles w ith a uto mat ic t ra nsmi ssio ns
• B rake the vehicle to a stop . The engine stops
shortly before the vehicle comes to a stop or if
the ve hicle is stationary
l). Keep yo ur foot on
l) Ma rket -spe cifi c
86
the brake peda l. The II indica tor light appears
in the status line at the bottom of the instru ­
ment cluste r display. The need le in the tachom ­
eter also moves into the
READY1> posit ion.
• The engine starts again when you take your
foot off the brake pedal. The indicator light
turns off .
Additional information for automatic
transmissions
The eng ine stops in the P, N and D selector lever
pos itions.
If you se lect the R posit ion du ring a Stop phase,
the engine will start aga in.
Se lect the P position quickly to prevent the e n­
gine from starting u nintent ionally when shifting
through R .
You can determine for yourse lf if the engine wi ll
stop o r not by red ucing or inc reasing the amount
of force you use to press t he brake peda l. For ex­
amp le, if yo u only lightly press on the brake ped­
al in stop-and-go traffic or when turning, the en­
gine w ill not switch off when the vehicle is sta ­
tiona ry . A s soon as you press the b rake down
harde r, the engine wi ll swi tch off .
(0 Tips
-Press the brake peda l during a Stop phase
to keep the vehicle from rolling .
-The ignitio n will turn off if yo u press the
! S TART ENGINE STOPI butto n du ring a stop
phase. The needle in the tachomet er moves
into the
OFF position.
General information
App lies to: vehicles wi th Start/S top sys te m
The standard Start/Stop mode can be canceled
for various system-related reasons.
Engine does not switch off
Before and dur ing each stop phase, the system
checks if certain conditions have been met. If the
lilJ.

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Trailer towing Driving with a trailer
General information
Your Audi was designed primarily for passenger
transportation .
If you plan to tow a trailer, please remember that
the additional load will affect durability, econo­ my and performance.
Trailer towing not only places more stress on the
vehicle, it also calls for more concentration from
the driver.
For this reason, always follow the operating and
driving instructions provided and use common
sense.
Technical requirements
Trailer hitch
Use a weight-carrying hitch conforming to the
gross trailer weight. The hitch must be suitable
for your vehicle and trailer and must be mounted
securely on the vehicle's chassis at a technically
sound
location . Use only a trailer hitch with a re­
movable ball mount . Always check with the trail­
er hitch manufacturer to make sure that you are
using the correct hitch.
Do not use a bumper hitch.
The hitch must be installed in such a way that it
does not interfere with the impact -absorbing
bumper system. No modifications should be
made to the vehicle exhaust and brake systems .
From time to time, check that all hitch mounting
bo lts remain securely fastened.
When you are not towing a trailer,
remove the
tra iler hitch ball mount . This prevents the hitch
from causing damage shou ld your vehicle be
struck from beh ind ¢
,&. .
Trailer brakes
If your trailer is equipped with a braking system,
check to be sure that it conforms to all regula­
tions .
Trailer towing
The trailer hydraulic brake system must not be
directly connected to the vehicle's hydraulic
brake
system ¢.&. .
Safety chains
Always use safety chains between your vehicle
and the trailer.
Trailer lights
T ra iler lights must meet all regulations . Be sure
to check w ith your author ized Audi dealer for cor­
rect wiring, switches and relays.
Mirrors
If you are unable to see the traffic behind you us­
ing the regular outside mirrors, then you
must in­
stall extended mirrors. It is important that you
always have clear vision to the rear.
,8. WARNING
After removing the traile r hitch, do not store
it in your vehicle. In case of sudden braking,
the hitch could fly forward and injure you or
your passengers.
Operating instructions
Maximum trailer weight
A trailer for your vehicle is limited to a typical
class 1 or class 2 trailer.
Trailer load distribution
Be sure the load in the trailer is held securely in
place to prevent it from shifting forward, back­
ward or sideways.
Never allow a passenger to ride in a trailer ¢.&.
in Driver messages on page 100 .
Engine cooling system
Towing a trailer makes the engine work harder. It
is important that the cooling system's perform ­
ance is up to the additional load. Make sure that
the cooling system has enough fluid.
Tire pressure
When towing a trailer, inflate the tires of your
vehicle to the tire pressure listed under "Full
load" on the label ¢ page 344. Inflate trailer
99

Trailer towing
tires to tra iler and tire manufacturers ' specifica­
tions.
Lights
The headlig ht settings should be chec ked with
the t railer at tached before d riving off. Check to
make su re both vehicle and trailer lights are
wo rking properly.
Safety chains
Be sure t railer safety chains are properly connect­
ed from the trai le r to the h itch on the veh icle.
L eave enough sla ck in the c ha ins to permi t turn­
ing corners . When you install safety chains, ma ke
sure they wi ll not drag on the road when yo u are
driv ing .
The cha ins shou ld cross u nder the trailer tongue
to prevent it from dropp ing in case of separation
from the h itch .
Driver messages
Driving with a trailer requires extra caution.
Weight d istribution
Towing a loaded trailer w ith an empty car resu lts
in a hig hly unstable dist ribution of weight . If this
cannot be avo ided, drive at very low speeds on ly
to avoid the risk of losing s teering con trol.
A "balanced " rig is eas ier to operate and control.
This means that the tow vehicle should be loaded
to the extent possible and permissible , while
keep ing the tra ile r as lig ht as possib le under t he
circumstances . Whenever possible, t ransfer
some cargo to the l uggage compartment of the
tow vehicle whi le observ ing tongue load req uire­
ments and ve hicle loading conside rat ions.
Speed
The h igher the speed, the more d ifficult i t be­
comes for the drive r to contro l the rig. Do not
d rive at the maximum permissible speed. Reduce
your speed even more if load, weath er or w ind
conditions are unfavorable
-part icularly when
going downhill.
100
Reduce vehicle speed immediately if the trailer
shows the slightest sign of swaying.
Do not try
to stop the swa ying by a ccelerating.
Observe speed limits. In some a reas, speeds fo r
vehicles towing tra ilers are lower than for regular
vehicles .
Always apply bra kes early. Whe n driving down­
hill, shift in to a lower gea r to use the eng ine
b raking effect to slow the vehicle . Use of the
bra kes alone can cause them to overheat and fai l.
Coolant temperature
The coo lant tempe rat ure gauge 9 page 11 must
be obse rved caref ully. The coolant temperature
can increase i f you drive o n long inclines in a low
gear at high engine speeds . Reduce your speed
immediately if the LEDs in th e top part of the dis­
play turn on.
For more info rmation abou t indicator lig hts, re­
fer
to . ~page 30 .
A WARNING
Anyone not prope rly restrained in a moving
vehicle is at a much greater risk in an acci­
dent. Never let anyone ride in your car who is
not properly wear ing the restraints provided
by Aud i.
Trailer towing
information
' Important to know
-
Your vehicle handles differently when towing a
trailer because of the addit ional weight and dif­
ferent weight distribution . Safety, performance
and economy will greatly depend on how ca refu l­
l y you load your tra ile r and ope rate yo ur rig.
Before you actually tow your trailer, pract ice
turning, stopping and backing up in an area away
from traffic . Keep pract icing u ntil you have be­
come complete ly familiar w ith the way yo ur vehi­
cl e- tra ile r combination behaves and respo nds.

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(D Note
Also read the informat ion in c::> (D in General
information on page 130 .
@ Tips
-You can can ce l the au toma tic b rake activa ­
tion w ith increasing braki ng fo rce if you ap ­
p ly the brakes yourse lf or accelerate cons id­
erab ly.
-In some situations, rea r cross-traffic assist
may warn yo u even if there is no cross t raffic
i n a cr itical area, for examp le when back ing
i nto a parki ng space or maneuver ing.
-The rea r cross-traffic ass ist also switches of f
when you switch off the ESC.
-The rea r cross traffic assist switc hes on and
off thro ugh t he pa rking aid
c::>page 136.
-The system is not available when towin g a
trailer.
Messages
App lies to: ve hicles with Audi side assist
A message appears in the instrument cluster dis­
p lay if the s ide assist switches off automatically .
@t Audi side assist: malfunction! Please contact
Service
@t Audi side assist and exit warning : malfunc­
tion! Please contact Service
The system c annot guarantee th at it will detec t
ve hicl es co rrectly and i t has switched off. The
sensors have been moved o r are faul ty. Have the
system checked by an a uth orized Audi dea ler or
author ized Audi Service Facility soon.
@t Audi side a ssist: currently unavailable. Sen­
sor vision restricted due to surround ings . See
owner 's manual
at Audi side a ssis t and exit warning : currently
unavailable. Sensor vision restricted due to sur­ roundings
The rada r se nso r vis io n is impaire d. T he ar ea in
fr on t of the senso rs must no t be covered by b ike
ra ck s, st ick ers, leaves, snow or any othe r o bj ects.
C lea n the area i n front of the senso rs, if necessa ­
ry
c::> page 129, fig . 130 .
Assistance systems
@t Audi side assist : currently unavailable. See
owne r's manual
at Audi side assist and exit warning: currently
unavailable. See owner's manual
S id e assist ca nnot be sw itched on at this time be­
c a u se the re is a ma lfun ction ( for ex ample, the
ba ttery ch arge leve l may be too low).
@t Audi side assist: unavailable in towing mode
(it Audi side assist and exit warning: currently
unavailable. Towing mode
Sid e assist switches off automatically when the
electrica l connecto r in the factory-installed t rail­
er hitch is connected. There is no guarantee the
system will sw itch off when using a retrofitted
t railer h itch . Do not use side assist and the ex it
warning w hen tow ing a traile r.
111 Rear parking aid: obstacle detection restrict­
ed
T he rear cross-traffic ass ist is not available. E i­
t h er the ESC is sw itched off, or the rada r senso rs
may be cove red by a bike rack, sticke rs, leaves,
snow or other objects. Switc h the ESC on , or
clean the area in front of the senso rs if necessary
c::> pag e 129, fig . 130 . If thi s m essage continues
to be displayed, dr ive immedia tely to an author­
i z ed Audi de aler or author ized Audi Se rvice Facili­
ty to ha ve the mal fu ncti on re paire d.
Audi drive select
Introduction
Applies to : vehicles with Aud i drive se lect
Drive select makes it possib le to exper ience dif­
ferent types of ve hicle sett ings in one ve hicle .
T he driver can select
Offroad *, Comfort , Auto
and Dynamic mod es in the Info tainm ent system
t o swi tch b etwee n a sp orty and a comfo rtable
dr iv ing mo de, fo r ex ample . In t he
Individual
mode, the settings can be a djusted to you r per­
sona l p references . This makes it possible to com­
bine settings such as a sporty engine setting with
li ght steer ing.
133

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Telephone Introduction
A pp lies to: ve hicles with telep hone
To make phone coils in your vehicle using the
MMI, connect your cell phone to the
MMI via
Bluetooth.
H and sfree
Afte r you have connected your cell phone to the
MMI via Bluetooth, you can use the handsfree
system and operate telephone functions through
your MMI. You can make calls using the antenna
on your cell phone.
A WARNING
- Medical experts warn that cell phones can
interfere w ith the function of pacemakers.
Always ma inta in a m inimum distance of 20
centimeters between the cell phone anten­
na and the pacemaker.
- Do not carry the cell phone in a pocket di­
rectly over the pacemaker when the phone
is switched on.
- Sw itch the cell phone off immediately if
you suspect it may be interfering with the pacemaker.
- Do not use the voice recognition system*
c::> page 168 in emergencies because your
voice may change in stressful situations. It may take longer to dial the number or the
system may not be able to dia l it at all. Dial
the emergency n umber manua lly.
- Switch your cell phone off in areas where
there is a risk of an exp losion. These loca­
tions are not always clea rly marked. This
may include gas stations, fuel and chemical
storage facilities or transport vehicles, or lo ­
cations where fuel vapors (such as propane
or gasoline vapor in vehicles or bu ildings),
chem icals or large quantities of dust parti­
cles (such as flour, sawdust or metal) may
be present in the air. Th is also applies to all
other locations where you would normally
tu rn your vehicle engine off.
- The demands of traffic requ ire your full at­
tent io n. Always read t he chapter
c::> page 155, Traffic safety information.
-
T e le ph on e
(D Note
Always fo llow the information found in Q (!) in
Wi-Fi hotspot on page 194.
(D Tips
- The Bluetooth connect ion range is limited
to inside the vehicle. It can also be affected
by local condit ions and interference with
other devices.
- To learn which Bluetooth connections and
wh ich of the functions in your cell phone are
supported, check with your cell phone serv­
ice provider or the database for mobile devi­
ces at
www .audiu sa.com /bl uetooth .
Setup
Connecting a cell phone using Bluetooth
Applies to: vehicles wi th telepho ne
Fig . 17 6 Display ing t he PIN for enter ing in t he cell ph one
R equirem ent
The vehicle must be stationary and the ignition
must be switched on.
T he Bl uetoo th funct ion and v isib ility o f the MMI
¢ page 250 and cell phone must be sw itched on.
T he cell phone to be connected must not be con­
nected to any other Bluetooth device.
T he
MMI must not be connected to a cell phone .
Connecting a cell phone
.,. Select: !MENUI button> T elephone > Co nnect
mobile dev ice
> Find new de vices > Ne xt. The
avai lable Bluetooth devices are shown in the In­
fotainment system display .
Or select: !MENUI
button > S etting s> left contro l button > MMI
s etting s
> Connec tion manag er ¢ page 249 . .,..
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Checking and Filling
Gasoline
Fuel supply
Applies to: veh icles with gaso line engine
Using the right fuel helps keep the environment
clean and prevents engine damage .
Fuel recommendation
The fuel recommended for your vehicle is unlead­
ed premium
grade gasoline. Audi recommends
using TOP TIER Detergent Gasoline with a mini­
mum octane rating of 91 AKI (95 RON). For more
information on TOP TIER Detergent Gasoline,
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 inside of the fuel filler flap . This rating
may be specified as AKI or RON.
Your vehicle may also be operated using unlead­
ed regular gasoline with a min imum octane rat ­
ing of 87 AKl/91 RON. However, using 87 AKl/91
RON octane fuel will slightly reduce engine pe r­
formance.
Use unleaded gasoline only. Unleaded gasoline
is available throughout the USA , Canada, and in
most European countries . We recommend that
you do not take your vehicle to areas or countries
where un leaded gasol ine may not be available.
For more information on refueling your vehicle,
see
c::> page 317 .
Octane rating
Octane rating indicates a gasoline's ability to re­
sist engine damaging "knock" caused by prema­
ture ignit ion and detonation . Therefore , buy ing
the correct grade of gasoline is very important to
h e lp prevent possible engine damage and a loss
of eng ine performance.
Gasoline most commonly used in the United
States and Canada has the following octane rat­
ings that can usually be found on the filler pump:
- Premium Grade: 91
-96 AKI
Checking and Filling
-Regu lar Grade: 87 -90 AKI
E xplanation of the abb reviations:
AKI =
Anti Knock Index = (R +M)/2 = (RON +MON)/
2
RON = R esearch Octane Number
MON = Motor Octane Number.
(D Note
- Do not use any fuel w ith octane ratings low­
er than 87 AKI or 91 RON otherwise expen­
sive engine damage w ill occur .
- Do
not us e leaded gasoline. The use of lead­
ed gasoline will severe ly damage your vehi­
cle's catalytic converter and its ability to
control exhaust emissions .
Blended gasoline
Applies to: vehicles with gasoline engine
Use of gasoline containing alcohol or MTBE
(methyl tertiary butyl ether)
You may use unleaded gasoline blended with al­
cohol or MTB E (commonly referred to as oxygen ­
ates) if the blended mixture meets the following
criteria:
Blend of gasoline methanol (wood alcohol or
methyl alcohol)
-Anti -knock index must be 87 AKI or higher.
- Blend must contain no more than 3% metha-
nol.
- Blend must contain more than 2% co-solvents.
Blend of gasoline and ethanol (grain alcohol or
ethyl alcohol)
- Anti-knock index must be 87 AKI or higher.
- Blend must not conta in more than 15% etha-
nol.
Blend of gasoline and MTBE
- Anti-knock index must be 87 AK I or higher.
- Blend must contain not more than 15% MTBE.
Seasonally adjusted gasoline
Many gasoline grades are blended to perform es­
pecially well for winter or summer dr iving . Dur-
ing seasonal change-over, we suggest that you
..,.
315

Checking and Filling
fill up at busy gas stations where the seasonal
adjustm ent is more likely to be mad e in time.
0 Note
- Methanol fuels which do not meet these re­
quirements may cause corrosion and dam­
age to plastic and rubber components in the
fuel system.
- Do not use fuels that fail to meet the speci­
fied criteria in this chapter .
- If you are unable to determine whether or
not a particular fuel blend meets the speci­
fications, ask your service station or its fuel
supplier.
- Do not use fuel for which the contents can­
not be identified.
- Fuel system damage and performance prob­
lems resulting from the use of fuels differ­
ent from those specified are not the respon­
sibility of Audi and are not covered under
the New Vehicle or the Emission Control
System Warranties.
- If you experience a loss of fuel economy or
driveability and performance problems due
to the use of one of these fuel blends, we
recommend that you switch to unblended
fuel.
Gasoline additives
Applies to: vehicles with gasoline engine
A major concern among many auto manufactur­
ers is carbon deposit build-up caused by the type
of gasoline you use .
Although gasoline grades differ from one manu­
facturer to another, they have certain things in
common. All gasoline grades contain substances
that can cause deposits to collect on vital engine parts, such as fuel injectors and intake valves.
Al­
though most gasoline brands include additives to keep engine and fuel systems clean, they are not
equally effective .
Audi recommends using TOP TIER Detergent Gas­
oline. For more information on TOP TIER Deter­
gent Gasoline, please go to the official website (www.toptiergas .com) .
316
After an extended period of using inadequate
fuels, built-up carbon deposits can rob your
en­
gine of peak performance.
([) Note
- Damage or malfunction due to poor fuel
quality is not covered by the Audi New Vehi­
cle Limited Warranty.
- Do not add aftermarket fuel additive prod­
ucts to your fuel tank.
Diesel fuel
Applies to: vehicles with diesel engine
Always use ULSD (Ultra Low Sulfur Diesel) No. 2.
The ULSD No. 2 meets the ASTM 0975.
Diesel fuel with concentrations of biodiesel high­
er than 5
% such as 811,820 or 8100 are strictly
prohibited.
Service station fuel pumps are labeled with the
correct fuel information for easy recognition by
the user. If the diesel fuel pump is not labeled
ask the station operator what fuel is being dis­
pensed before filling up your vehicle.
ULSD No. 2 may not be available outside the USA
and Canada. Be sure to check before traveling to
other countries.
ULSD No. 2 can become thicker in very cold tem­
peratures, and this can impair the engine's start­
ing and running . Depending on the season , gas
stations provide ULSD No. 2 that flows better in
cold temperatures so that you can continue oper­
ating your vehicle as usual.
(D Note
- Your vehicle's diesel engine was designed
soley for use with ULSD No. 2. Therefore,
never use gasoline, heating oil, other fuels
or flow improvers. These contain substances
that will severely damage the fuel system
and the engine. Such damage will not be
covered by your New Vehicle Limited War­
ranty.
- If you put any amount of incorrect fuel in
the fuel tank, do not start the engine under
.,..

any circumstances. Immediately contact the
nearest authorized Audi dealer or author­
ized Audi Service Facility for assistance.
These fuels contain substances that can se­
verely damage the fuel system and the en­
gine if the engine is started.
Refueling
Fuel filler neck
The fuel filler neck is located on the right rear
side panel behind the fuel filler flap.
If the power locking system should fail, you can
still open the flap manually
-for detailed instruc­
tions see
¢page 319.
You can find the fuel tank capacity of your vehicle
in
¢page 381.
The label on the inside of the fuel filler flap tells
you the correct fuel for your vehicle. For more in­
formation about fuel specifications, see
<=?page 315.
Your veh icle fuel tank has an onboard refuelling
vapor recovery system. This feature he lps to pre­
vent fuel vapors from escap ing from the tank and
polluting the environment while you refuel your
vehicle . In order to fill the tank properly while
protecting the environment, please follow this
refueling procedure carefully.
A WARNING
Under normal operating conditions, never car­
ry additional fuel containers in your car. Gas
canisters and other containers used to trans­
port fuel can be dangerous. Such containers,
full or empty, may leak and could cause a fire
in a collision. If you must transport fuel to
use for your lawn mower, snow blower, etc.,
be very careful and always observe local and
state laws regarding the use, transportation
and storage of such fuel containers. Make cer­
tain the container meets industry standards
(ANSI/ASTM F8S2
-86).
(D Note
Never dr ive your vehicle until the fuel tank is
completely empty. The irregu lar supply of
Checking and Filling
fuel can cause misfiring. Gasoline could enter
the exhaust system and damage the catalytic
converter.
Fueling procedure
Fig. 260 Right rear side of the vehicle: opening the fuel
f ilte r door
Fig. 261 Fuel filler door with attached fuel cap
The fuel filler door is unlocked or locked by the
central locking system.
Opening the fuel cap
.,. Press the left side of the fuel filler door to open
it¢
fig. 260 -arrow-.
.,. Unscrew the tank cap counterclockwise.
.,. Place the cap from above on the open fuel filler
door¢
fig. 261.
Closing the fuel cap
.,. Turn the fuel cap to the right until it stops.
.,. Close the fuel filler door until it latches.
Once the pump nozzle switches off, the fuel tank
is "full". Do not fill the tank more. Otherwise the
expansion space in the tank will be filled.
The correct fuel type for your vehicle can be
found on a label located on the inside of the fuel
.,.
317

Checking and Filling
filler door. For additional information on fuel,
see
<=> page 315.
The fuel tank capacity of your vehicle is listed in
the
Technical Data section <=> page 381.
To avoid fuel spilling or evaporating from the fuel
tank always close fuel cap properly and com­
pletely . An improperly closed fuel filler cap may
also cause the MIL lamp
<=>page 24 to come on.
A WARNING
Not paying attention when fueling or han­
dling fuel incorrectly can lead to fires, explo­
sions or serious injuries.
- Fuel ignites easily and can cause serious
burns and other injuries .
- If you do not switch the engine off when fu­
eling and/or do not insert the fuel nozzle
completely into the tank opening, fuel can
leak out or run over. Leaked fuel can ignite
and start a fire .
- Do not use the telephone while fueling. The
electromagnetic rays can cause sparks,
which can ignite fuel vapors and start a fire.
- Do not sit in your vehicle while fueling. If
you must make an exception and enter your
vehicle again while fueling, close the door and touch metal to discharge static electric­
ity before touching the fuel nozzle . Static
electricity can create sparks, which can ig­
nite vapors when fueling.
- Do not smoke or have an open flame in the
area when fueling your vehicle or filling a
fuel container because this increases the
risk of an explosion .
-For your safety , carrying fuel containers in
your vehicle is not recommended. Whether
full or empty, the container can leak and
cause a fire in the event of an accident.
-If you must make an exception and trans­
port a fuel container, note the following:
- Never fill the fuel container with fuel
while it is in or on the vehicle . Stat ic elec ­
tricity is discharged when filling which can
cause the fuel vapors to ignite and in­
creases the risk of an explosion.
- Always place a fuel container on the
ground before filling.
318
-Always hold the fuel nozzle completely in
the fuel container when filling.
-If the fuel container is made of metal, the
fuel nozzle must always be in contact with
the container when filling it with fuel. This
prevents static electricity from discharg­
ing .
-Never spill fuel in the vehicle or the lug­
gage compartment . Evaporated fuel is ex­
plosive and increases the risk of serious in­
jury or death .
- Follow legal requirements when using, storing and transporting fuel containers .
-Make sure the fuel container conforms to
industry standards (ANSI/ASTM F8S2 -86).
{(D Note
- Remove spilled fuel from vehicle paint im­
mediately, because it can damage paint.
- Never drive until the fuel tank is completely
empty. The irregular supply of fuel that re­
sults from that can cause engine misfires.
Uncombusted fuel will enter the exhaust
system and increase the risk of damage to
the catalytic converter.
- If the fuel tank runs completely empty in a
vehicle with a
diesel engine, the ignition
must remain switched on for at least 30
seconds after refueling before starting the
engine.
It may take longer than usual for
the engine to start, even up to a minute.
This is because the air must first bleed out
of the fuel system when starting the engine.
@ For the sake of the environment
Do not overfill the fuel tank, otherwise fuel
can leak out when the vehicle is warming up.
@ Tips
Diesel vehicles are equipped with a diesel mis­
fueling guard.
It allows the vehicle to be fu­
eled only with a diesel fuel pump nozzle. A
worn or damaged nozzle or a nozzle that is
too small may not be able to open the diesel
misfueling guard. If this is the case, try turn­
ing the nozzle before inserting it in the fuel
filler neck, use a different fuel pump, or see
..,_

an authorized Audi dealer or authorized Audi
Service Facility for assistance.
Fuel filler door emergency release
If the central locking system is faulty, the fuel
filler door can be unlocked manually.
Fig. 262 Luggage co mpartment: opening the side trim
panel
Fig . 263 Luggage compartment: fuel filler door e merge ncy
r elease
The emergency opening mechanism is located
behind the right side trim panel in the luggage
compartment.
... Open the cover in the side panel ¢fig. 262.
... Loosen the loop c;, fig. 263 from the retainer
and then pull on the loop carefully
¢(D . The
filler door is released .
... Press on the left side of the fuel filler door to
open it
¢ page 317, fig. 260.
(D Note
Only pull on the loop until you feel resistance.
You will not hear it release . Otherwise you
could damage the emergency release mecha­
nism.
Checking and Filling
Selective catalytic
reduction (AdBlue/DEF)
General information
Applies to: vehicles with selec tive catalytic reduction
In vehicles with selective catalytic reduction, a
urea solution (AdBlue/DEF) is injected into the
exhaust system in front of a nitrogen oxide cata­
lytic converter to reduce nitrogen emissions. The
urea solution is known as Ad Blue or DEF (Diesel
Exhaust Fluid). The information that follows w ill
use the name AdBlue.
The Ad Blue is carried in a separate tank in the ve­
hicle. The AdBlue usage accounts for approxi­
mately 1.0% to 4 .0% of the diesel fuel that is
used .
When a message about refilling the AdBlue ap­
pears in the instrument cluster display, you must
refill the AdBlue yourself or have it refilled by an
authorized Audi dealer or authorized Audi Service
Facility
c;, page 320 .
{D Tips
-The display indicates the distance remaining
that can be dr iven
c;, page 319. If the Ad Bl­
ue tank is completely empty, the engine will
not start again after the ignition is switched
off.
-Ad Blue is required by law to operate this ve­
hicle.
Messages in the instrument cluster display
Appl ies to: vehicles wi th selective catalytic reduction
The display indicates if the Ad Blue level is low or
if there is a system malfunction.
AdBlue level low
You will be informed in the instrument cluster
display if the AdBlue in the tank drops below a
certain level. Add at a minimum the amount of
AdBlue shown in the message:
II Refill with at least x qt (l) Ad Blue. Range
x mi (km )
319