2021 AUDI Q2 check engine

Checking and topping up fluids

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Checking and topping up
fluids
Fuel
Petrol grade
Applies to: vehicles with petrol engine

The
correct grade of petrol is listed inside the
fuel tank flap.
The vehicle is equipped with a catalytic converter
and must only be run on unleaded petrol. Petrol
must be sulphur-free and must comply with the
EN 228 standard. You can fuel your vehicle with
fuels containing a maximum of 10%
ethanol

(E10). The petrol grades have different octane
ratings (RON).
The following headings relate to the sticker on
the inside of your vehicle's tank flap:
Unleaded fuel only RON/ROZ
95
Super,
Premium or
min.
RON/ROZ 91 Normal
The use of premium petrol (95 RON) is recom­

mended.
If
that
type of fuel is not available,
reg­

ular petrol (RON 91) can be used with a slight
loss of power.
Unleaded fuel only, min. RON/ROZ
95

Super, Premium
Premium petrol (at least 95 RON) must be used.
If premium petrol is not available, the engine can
be run on regular petrol with 91 RON as an
emer­

gency measure. In this case only use moderate
engine speeds and a light throttle. Fill up with
premium or Super Plus petrol as soon as possi­

ble.

Unleaded fuel only RON/ROZ 98 Super Plus
or min. RON/ROZ 95 Super, Premium
The use of Super Plus petrol (98 RON) is recom­

mended.
If
that
type of fuel is not available, pre­
mium petrol (RON 95) can be used with a slight
loss of power.
If premium petrol is not available, the engine can
be run on regular petrol with 91 RON as an
emer­

gency measure. In this case only use moderate
engine speeds and a light throttle. Fill up with
premium or Super Plus petrol as soon as possi­

ble.

© CAUTION
- Do
NOT fuel
your vehicle with
high-ethanol

fuel blends (e.g. E50 or E85). This will dam­
age the fuel system.
- just one tank of leaded fuel or fuel with
metallic additives will permanently impair
the efficiency of the catalytic converter.
- You should use only petrol additives which
have been approved by Audi. Additives with
so-called octane boosters or antiknock
addi­

tives can contain metallic additives that
cause significant damage to the engine and
the catalytic converter. Do not use such ad­
ditives.
- Metal-based fuels, which can be identified
from the marking on the fuel dispenser,
must not be used. LRP fuel (lead replace­
ment petrol) also contains high concentra­
tions of metallic additive. Risk of engine
damage!
- High engine speed and full throttle can
damage the engine when using petrol with
an octane rating lower than the correct
grade for the engine.
- You can use higher octane fuel than your en­
gine requires.
- In countries where sulphur-free fuel is not
available, you may use low-sulphur fuel in­

stead.

Diesel fuel
Applies to: vehicles with diesel engine
Please note the information on the inside of the
fuel tank flap.
The use of sulphur-free diesel complying with
the EN 590 standard is recommended.
Diesel can thicken at very low temperatures,
which can result in problems starting the engine
or prevent the engine from running smoothly.
For this reason, filling stations in some countries
offer winter-grade diesel fuel during the cold
289

Checking and topping up fluids
months so that you can continue to operate your
vehicle reliably. Ask at your filling station wheth­
er the diesel fuel available there is suitable for
the current conditions and for the temperatures
which could potentially occur.
© CAUTION
- Never use FAME fuels (biodiesel), petrol,
heating oil, thinners or any other fuels or
additives, as these could cause serious dam­
age to the fuel system and the engine.
- Never start the engine if
you
fill up with the
wrong type of
fuel,
as this could damage
the fuel system and the engine. Obtain pro­
fessional assistance.

Filling the tank

Procedure for filling the tank

Fig.
238 Vehicle as seen from the rear right: Opening the

fuel tank
flap

fe

Fig.
239 Fuel tank flap with tank cap attached
The fuel tank flap is unlocked and locked auto­
matically by the central locking system.
Unscrewing the tank cap

•
Press the left side of the flap to open
it
-arrow­

ed
Fig.
238.

•
Unscrew the tank cap anti-clockwise.

•
Hook the cap onto the open flap
•=>
Fig.
239.

Closing the tank cap

•
Screw on the tank cap clockwise until
it
clicks
audibly.

•
Close the tank flap. Make sure you hear
it
click
into place.
When the automatic filler nozzle is operated cor­
rectly
it
will switch itself off
as
soon as the tank
is
fulL.
Do not try to put in more fuel after the
nozzle cuts out, as this will fill the expansion
chamber in the fuel tank.
The correct fuel grade for your vehicle is given on
a sticker on the inside of the tank flap. Further
notes on fuel
^>page
289.
The tank capacity of your vehicLe is given in the
Technical data section
^>page
343.
A WARNING
Fuel is highly inflammable and can cause
seri­

ous burns and other injuries.
- For safety reasons we do not recommend
carrying a spare fuel canister in the vehicle.
The canister could become damaged in an
accident and Leak.
- Observe all relevant statutory regulations
on using, storing and transporting spare
fuel canisters.
- When filling your tank or
a
spare fuel canis­
ter with
fuel,
do not smoke and keep away
from naked flames
-
risk of explosion!
- If, in exceptional circumstances, you have
to

carry
a
spare fuel canister, please observe
the following warnings:
- Never
filL
fuel into the spare fuel canister
with the canister placed in or on top of the
vehicLe. An electrostatic charge could
build up during filling, causing the fuel va­
pour to ignite
-
risk of explosion! Always
place the canister on the ground to fill
it.

- Insert the filler nozzle as far as possibLe
into the spare fuel canister.
-
If
the spare fuel canister is made of metal,
the filler nozzle must be in contact with
the canister during filling. This helps pre­
vent an electrostatic charge building up.
290

Checking and topping up fluids

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- Make sure you never spill fuel in the
vehi­

cle or in the luggage compartment. Fuel
vapour is explosive - danger to life!
© Note
(7) CAUTION
- If any fuel is spilt onto the vehicle, it should
be removed immediately as it could other­
wise damage the paintwork.
- Never run the tank completely dry. If there
is an irregular fuel supply, misfiring can oc­
cur. As a result unburnt fuel can enter the
exhaust system and cause damage to the
catalytic converter(s).
- Applies to vehicles with diesel engine: When
filling the fuel tank after having run it com­
pletely dry, the ignition must be switched
on for at least 30 seconds before the engine
is started. When you then start the engine it
may take longer than normal (up to one mi­
nute) for the engine to start firing. This is
because air needs to be bled from the fuel
system while starting.
® For the sake of the envir
Do not try to put in more fuel after the auto­
matic filler nozzle has switched off; this may
cause the fuel to overflow if it becomes warm.

(T)
Note
Applies to: vehicles with diesel engine
Diesel vehicles are equipped with an incorrect
fuelling protection
system1).
This system en­
sures that the tank can only be fuelled from a
diesel filler nozzle.
- If the filler nozzle is old, damaged or too

small,
it may not be able to open the pro­
tection mechanism on the fuel tank. In this

case,
try turning the filler nozzle before in­
serting it in the fuel filler neck, use a differ­
ent filling pump or seek professional assis­

tance.

- The protection mechanism will not open if
you try to add fuel from a spare fuel canis­
ter. You can get round this simply by adding
the diesel fuel slowly.

1)
May vary in different countries
The tank flap is not locked when you lock the
vehicle from the inside.
Releasing the tank flap manually

The
tank flap can be released manually if the
central locking system should fail to operate.

Fig.
240 Luggage compartment (rear right): Manual re­
lease under luggage compartment floor
The manual release mechanism is located under
the floor panel in the side trim on the right of the
luggage compartment.

•
Lift up the floor panel until it is fixed in position
behind the retaining tabs on the two side sec­
tions
•=>
page 319.
• Take the screwdriver out of the vehicle tooL kit

^>page
319. Use the flat-blade side of the re­
versible insert.

•
Use the screwdriver to prise off the cover
(l)

and remove
it(|).

• Release the ring from its holder and carefully
pull the ring
(S)
-arrow-
•=>([)•
The tank flap is
then released.

•
Press the left side of the tank flap to open it

•=>
page 290, Fig. 238.
© CAUTION
Stop pulling the ring when you feel resistance
at the ring/cover (the release mechanism is
not audible). Otherwise, you could damage
the manual release mechanism.
291

Checking and topping up fluids
Selective catalytic
reduction (AdBLue/DEF)
General notes
Applies to: vehicles with selective catalytic reduction
On vehicles with selective catalytic reduction, a
urea solution (AdBLue/DEF) is injected into the
exhaust system upstream of
a
NOx catalytic
con­

verter in order to reduce nitrogen oxide emis­

sions.
The urea solution is known under the name
of AdBlue or DEF (Diesel Exhaust Fluid). The term
AdBlue is used below.
The AdBlue is held in a separate tank on the
vehi­

cle.
AdBlue consumption is approximately 1.0 -
2.5% of diesel fuel consumption.
As soon as a message appears in the instrument
cluster display reminding you to refill AdBlue,
you must refill the AdBlue tank or have this done
by
a
qualified workshop
^>page
293.
Checking the remaining range
The remaining (estimated) range for the current

AdBLue
level can be displayed on the on-board
computer:
- Vehicles with analogue instrument cluster

•=>
page 20.
- Vehicles with virtual cockpit*
<$page
19.
-The instrument cluster display will
tell
you
how far you can drive before the tank runs
dry
•=>page
292. If the AdBlue tank runs
dry, the engine cannot be started again af­
ter you switch off the ignition.
-The use of
AdBLue for
the operation of this
vehicle is required by Law.
Instrument cluster display
Applies to: vehicles with selective catalytic reduction

The
display informs you if the AdBlue level is too
low or if a system malfunction occurs.
Low AdBlue level
You will be informed if the amount of AdBlue in
the tank falls below a certain
Level.
Add at least
the minimum (smaller) amount of AdBlue

shown:

S
Refill x
I
- x
I
AdBlue. Range: x km
This message tells you the maximum distance

that
you can drive with the remaining amount of
AdBlue. Refill AdBLue.

3
Refill x
I
- x
I
AdBlue! No restart in x km! See
owner's manual
This message tells you the maximum distance
that you can drive with the remaining amount of
AdBlue. Refill AdBlue. Otherwise, after driving
the maximum distance and switching off the en­

gine,
you will not be able to restart the car.
| Refill x
I
- x
I
AdBlue! No restart. See own­
er's manual
This message appears when there is no more
AdBlue left in the tank. Refill AdBlue. Otherwise,
you will not be able to restart the car after you
switch off the engine.
When the AdBlue in the tank reaches the
mini­

mum
level,
you must add AdBlue
^>page
293,
Preparations.
Filling the wrong fluid / system fault
If
you
fill the AdBlue tank with a fluid other than
AdBlue and the system detects that the wrong
fluid has been added or there is a system fault, a
driver message will appear.

|
AdBlue:
system fault. No restart in x km!
See owner's manual
This message tells you the maximum distance

that
you can drive. Drive to a qualified workshop
and have the fault rectified. Otherwise, after driv­
ing the maximum distance and switching off the
engine, you will not be able to restart the car.
|
AdBlue:
system fault. No restart! See own­
er's manual
This message appears if the system detects that
the tank has been filled with the wrong fluid or if
there is a system fault. Drive to the nearest quali­
fied workshop without delay and have the fault

rectified.
Otherwise, you will not be able to re­
start the car after you switch off the engine.
292

Checking and topping up fluids
Preparations
Applies to: vehicles with selective catalytic reduction

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Fig.
241 Vehicle as seen from the rear right: Unscrewing
the AdBlue cap
The AdBlue filler neck is located immediately be­
side the diesel filler neck. Add at least the
amount of AdBlue displayed in the instrument
cluster. If
you
do not refill this amount of
fluid,

the system may not detect that the tank has
been refilled and it may not be possible to restart
the engine. You can refill with a maximum of 12

litres.

Important: A message in the instrument cluster
display informs you if
you
need to refill AdBlue.

•
Park the vehicle on a level surface.

•
Switch off the ignition.
• Open the tank flap
<^>page
290.

•
Unscrew the cap on the filler neck
anti-clock­

wise
^>Fig.
241.

*•
Refill AdBlue from a filler nozzle
^>page
293,
canister
^>page
294 or bottle
^>page
294.
A WARNING
AdBlue can cause irritation to the
skin,
eyes,
and respiratory organs. Wash thoroughly with
clean water should you come into contact
with this
fluid.
Seek medical assistance if nee­

ded.

© CAUTION
- Use only
AdBLue
that complies with the ISO
22241-1 standard. Do not mix AdBlue with
additives and do not dilute it with water.
- AdBlue must not be added to the diesel
tank, and diesel must not be added to the
AdBlue tank. Never start the engine if you
fill up with the wrong type of
fuel,
as this
could damage the tank system and the en­

gine.
Obtain professional assistance.
-AdBlue attacks surfaces such as paintwork,
plastic veneer and carpets. Remove spilt
flu­

id as soon as possible with a damp cloth and
plenty of water. If the AdBlue has already

solidified,
use warm water and a sponge.
Residues of AdBlue solidify after
a
while if
they are not removed and can damage the
affected surface.
- Do not keep refill bottles or canisters in the
vehicle, as AdBlue can leak and damage the
vehicle interior.
- Keep AdBlue away from clothing. Wash
thoroughly with clean water should you
come into contact with this
fluid.

\J
Note
Please follow the AdBlue manufacturer's in­
structions for storage and use.
Refilling AdBlue from a filler nozzle
Applies to: vehicles with selective catalytic reduction

•
Open the tank flap
^>page
290.

*•
Unscrew the cap on the filler neck
anti-clock­

wise
^>page
293, Fig. 241.

*•
Fill up with AdBlue until the first time the filler
nozzle cuts off the supply
•=>(]}.

•
Put the tank cap back on
opage
294, After re­
filling.
CAUTION
- The handle of the filler nozzle must point
downwards when filling the tank. Otherwise
the filler nozzle will not cut off the supply
automatically
^0
in Preparations on
page 293.
- You should stop refilling the first time the
filler nozzle automatically cuts off the sup­
ply. Otherwise the level of AdBlue in the
tank may be too high and AdBlue could
overflow
<=>©
in Preparations on page 293.
293

Checking and topping up fluids
Refilling AdBlue from a canister
Applies to: vehicles with selective catalytic reduction

#

Fig.
242 Canister with screw-on hose
• Take the cap off the refill canister
o^/n
Prep­
arations on page 293,
<=>(T)
in Preparations on
page 293.

•
Screw the end of the hose (î) clockwise onto
the opening on the canister®.

•
Remove the cap
@
from the other end of the
hose®.

•
Fit the end of the hose (2) onto the filler neck
on the vehicle and turn clockwise as far as the
stop to secure.
• Lift the canister and then tilt it. Keep it tilted
until empty or until no more fluid runs into the
tank.

•
Remove the canister and screw the tank cap
back on
^>page
294, After refilling.
CAUTIO
Use only refill canisters of the correct type ap­
proved for your vehicle. AdBlue may Leak out
if
you
use another system.
© Note
- Your qualified workshop can tell you which
refill canisters are approved
for
your
vehi­

cle.

- Approved refill canisters contain about 5 li­
tres of AdBlue.
Refilling AdBlue from a bottle
Applies to: vehicles with selective catalytic reduction

•
Take the cap off the refill bottle
<=>^
in Prepa­
rations on page 293,
•=>(?)
in Preparations on
page 293.

•
Screw the bottle clockwise onto the filler neck
as far as it will go.

•
To empty the bottle, lightly press the bottom
of the bottle. Keep pressing the bottom of the
bottle until the bottle is empty, or until no
more fluid runs into the tank.

•
Remove the bottle and screw the tank cap back
on
<=>page
294, After refilling.
(J) CAUTION
Use only refill bottles of the correct type ap­
proved for your vehicle. AdBlue may leak out
if
you
use another system.
- Refill bottles are available from qualified
workshops.
- Approved refill bottles contain about 1.9 Li­
tres of AdBlue.
After refilling
Applies to: vehicles with selective catalytic reduction
Closing the filler neck

•
Screw the AdBlue cap clockwise onto the filler
neck until the AdBlue cap clicks audibly
•=> /\
in
Preparations on page 293,
^>(T)in
Prepara­
tions on page 293.

•
Press the left side of the flap to close it (you
should hear it click into place).
After refilling
The vehicle must be driven so that the system
can detect the AdBlue which has been added.
This process can take several minutes.
• If the AdBlue tank had run dry and a range of
0 km was shown on the display, switch on the
ignition for approx. 30 seconds before starting
the engine.
© Note
AdBlue can freeze in the tank at very Low
tem­

peratures. In this case, the system will not
detect AdBlue when you refill and will contin­
ue to indicate a Low
AdBLue
Level. The mes­
sage will disappear as soon as the tank has

thawed.

294

Checking and topping up fluids

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Emission controL
systems
Catalytic converter
Applies to: vehicles with petrol engine
The vehicle must only be used with unleaded pet­

rol,
otherwise the catalytic converter will be ir­
reparably damaged.
Never allow the fuel tank to run completely dry,
as the irregular supply of fuel can cause misfir­

ing.
This allows unburnt fuel to enter the exhaust

system,
which can cause overheating and dam­
age to the catalytic converter.
Diesel particulate filter
Applies to: vehicles with diesel engine
The diesel particulate filter can filter out almost
all soot particles contained in the exhaust gas. In
normal driving conditions the filter is self-clean­

ing.
Should the self-cleaning function of the filter
not be able to operate, e.g. when the vehicle is
continuously used only for short trips, the filter
becomes obstructed with soot and the indicator

lampnf°r
the
diesel particulate filter Lights up

cépage
34.
A WARNING
The exhaust system is very hot when the
vehi­

cle is being driven and after the engine has
been switched off.
- Never touch the tailpipes when they are hot
- risk of burns!
- Because of the high temperatures which can
occur in the emission controL system, do not
park the vehicle where the exhaust can
come into contact with flammable materials
under the car (e.g. on grass or at the forest
edge) - risk of fire!
- Do not apply any underseal agents in the
area around the exhaust system - risk of

fire!

Engine compartment
Working on components in the engine
compartment
Extra caution is necessary when working on com­
ponents in the engine compartment.
Always be aware of the danger of injury and
scalding as well as the risk of accident or fire
when working in the engine compartment (e.g.
when checking and refilling fluids). Always ob­
serve the warnings listed below and follow all
normal safety precautions. The engine compart­
ment of any motor vehicle is a potentially haz­
ardous area
oA-

A WARNING
- Switch off the engine.
-Switch off the ignition.

-Applythe
parking brake.
- On vehicles with manual gearbox place the
gear lever in neutral, on vehicles with auto­
matic gearbox move the selector lever to
position P.
- To avoid the risk of being scalded, never
open the bonnet if
you
see steam or coolant
escaping from the engine compartment.
Wait until no steam or coolant can be seen
before opening the bonnet.
- Wait for the engine to cool down.
- Keep children away from engine compart­
ment.
- Never spill fluids on a hot engine. These
flu­

ids can cause a fire (e.g. radiator
anti­

freeze).
- Take care not to cause short circuits in the
electrical system.
- When working in the engine compartment
be aware that the radiator fan may start
running suddenly, even if the ignition is
switched off - risk of injury!
- Do not unscrew the cap on the expansion
tank when the engine is hot. The cooling
system is under pressure.
- Protect face, hands and arms by covering
the cap with a large, thick rag to protect
against escaping coolant and steam.
295

Checking and topping up fluids
- Never remove the engine cover panel - risk
of burns!
- If any tests have to be performed with the
engine running, there is an extra safety risk
from the rotating parts, such as the drive

belts,
alternator and radiator
fan,
etc., and
from the high-voltage ignition system.
- Never touch the radiator fan. The electric
additional fan is controlled by temperature
and can start running without warning.
- Applies to vehicles with automatic gearbox:
Never open the throttle inadvertently (for
instance by hand from the engine compart­
ment) if
a
gear is engaged while the vehicle
is stationary with the engine running. The
vehicle will otherwise start moving immedi­
ately and could cause an accident.
- Observe the following additional warnings if
work on the fuel system or the electrical
system is necessary:
- Do not smoke.
- Never work near naked flames.
- Always keep an approved fire extinguisher
immediately available.
- Any work on the batteries and electrical sys­
tem in your vehicle entails a risk of injury
and chemical burns in addition to danger of
accident or fire.
For
this reason, you must
have the work carried out by
a
qualified
workshop.
© CAUTION
When topping up fluids make sure the correct
fluid is put into the correct filler opening. This
can otherwise cause serious malfunctions or
engine damage.
® For the sake of the environment
Inspect the ground underneath your vehicle
regularly so that any Leaks are detected at an
early stage. If
you
find spots of oil or other

fluids,
have your vehicle inspected in the
workshop.
© Note
located on the other side of the engine com­
partment.
Opening/closing the bonnet

The
bonnet is released from inside the vehicle.

Fig.
243 Detail of footwell on driver's side: Release lever

I

On right-hand drive vehicles* some of the
containers / reservoirs mentioned below are

Fig.
244 Unlocked bonnet: Lever
The wiper arms should be resting on the
wind­

screen:
make sure they are not in a raised
posi­

tion.
Otherwise the paint may get damaged.
Opening the bonnet

•
With the driver's door open, pull the lever un­
der the dashboard in the direction indicated
(arrow)
^>Fig.
243.

*•
Lift the bonnet slightly
•=> A-
•
Press the Lever under the bonnet in the direc­
tion indicated by the arrow
^>Fig.
244. This will
release the arrester hooks.

•
Open the bonnet.
Closing the bonnet
• To close the bonnet, pull it down to overcome
the spring pressure.

•
Then let it drop into the catches; do not press
down
|=>^.
•
296