Get Checking and topping up fluids -> Selective catalytic reduction (AdBlue/DEF) Guide for Audi Rs Q8 SUV First Generation (2020-2026)

Checking and topping up fluids

from the tank system, pull the  button in

the driver's door again.

For the sake of the environment

– Do not try to put in more fuel after the au-

tomatic filler nozzle has switched off; this

may cause the fuel to overflow if it becomes

warm.

– If the engine has switched itself off due to a

lack of fuel, you may need to add up to 15

litres of fuel for the vehicle to detect that it

has been refuelled. Otherwise it may not be

possible to restart the engine.

– Never pour fuel down drains or into the

ground.

– Fuel can age and cause starting problems.

Audi recommends refuelling your vehicle

within six months.

Note

The fuel tank flap is not locked when you lock

the vehicle from the inside by pressing the

central locking switch.

Having the fuel tank flap released

manually

►

If you cannot open the fuel tank flap, seek pro-

fessional assistance.

Note

Applies to: vehicles with diesel engine

►

Then drive to a qualified workshop and have the

fault rectified.

Diesel vehicles are equipped with an incorrect

fuelling protection system . This system en-

sures that the tank can only be fuelled from a

diesel filler nozzle.

Selective catalytic

– 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.

reduction (AdBlue/DEF)

General information

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 catalytic converter changes nitrogen

oxides into nitrogen and water with the help of

the urea solution AdBlue/DEF. The urea solution

is known as AdBlue or DEF (Diesel Exhaust Fluid).

The term AdBlue is used below.

– 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 slowly.

Note

Applies to: vehicles with plug-in hybrid drive

The AdBlue is held in a separate tank in the vehi-

cle. AdBlue consumption is normally between

1.0 ltr. – 2.5 ltr./1000 km. In individual cases,

the consumption may be different as a result of

how the vehicle is driven along with the operat-

ing and ambient temperature.

– When you insert the filling nozzle, make

sure that it does not press against the tank

flap release mechanism 1 (see label inside

tank flap 2 ðFig. 195). Otherwise, a valve

in the filler neck will close and the refuelling

process will be interrupted although the

tank is not yet full.

It is not sufficient to simply have AdBlue refilled

when the vehicle is serviced because this may be

necessary more often than services are due or be-

tween service intervals.

– If you have pressed the tank flap release

mechanism unintentionally, you will need to

bleed the air from the tank system again. It

is not necessary to remove the filling nozzle

from the filler neck to do so. To bleed the air

As soon as a message appears in the instrument

cluster display reminding you to refill AdBlue,



Depending on country

314

Checking and topping up fluids

you must refill the AdBlue tank or have this done

by a qualified workshop ðpage 316.

tain level. You should always fill up with AdBlue

when requested to do so on the instrument clus-

ter display.

Legal information

 Please refill at least x ltr. of AdBlue/DEF the

next time you refuel. Range x km

– It is not permitted to make technical changes

to the emission control system which have an

effect on the exhaust gas treatment using

AdBlue.

This message tells you the maximum distance

that you can drive with the remaining amount of

AdBlue. Refill AdBlue.

– Audi has approved this vehicle for use only with

AdBlue corresponding to ISO-22241-1, for

which the Certificate of Conformity for this type

of vehicle has been issued.

 Refill at least x ltr. of AdBlue/DEF. No re-

start 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. You

can also call up the remaining distance on the on-

board computer.

– It may be a crime to operate the vehicle without

the AdBlue which corresponds to ISO-22241-1.

– If the emission control system is not operated

as intended, the exhaust emissions may wor-

sen.

– The use of AdBlue for the operation of this vehi-

cle is required by law.

 Refill at least x ltr. of AdBlue/DEF. Engine

cannot be restarted. See owner's manual

Note

– The instrument cluster display will tell you

how far you can drive before the tank runs

dry ðpage 315, Low AdBlue level. If the

AdBlue tank runs dry, the engine cannot be

started again after you switch off the igni-

tion. Never run the AdBlue tank completely

dry.

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 ðpage 316,

Before refilling AdBlue.

– Restrictions may be encountered when re-

filling in very cold temperatures, because

the freezing point of AdBlue is -11 °C.

– The system is heated when the vehicle is

running to ensure that the exhaust gas

treatment operates even at very low tem-

peratures.

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.

 Please check AdBlue/DEF. See owner's man-

ual

Instrument cluster display

Applies to: vehicles with selective catalytic reduction

This message appears if the system detects that

the tank has been filled with the wrong fluid or

with non-standard AdBlue or if there is a system

fault. Drive to a qualified workshop and have the

fault rectified.

The display informs you if the AdBlue level is too

low or if a system malfunction occurs.

The following driver messages may appear, de-

pending on the equipment installed in your vehi-

cle:

 AdBlue/DEF: fault. No restart in x km. See

owner's manual

Low AdBlue level

This message appears if the system detects that

the tank has been filled with the wrong fluid or

A series of warnings will inform you if the

amount of AdBlue in the tank falls below a cer-



315

Checking and topping up fluids

►

with non-standard AdBlue or if there is a system

fault and the vehicle can only be driven as far as

indicated in the instrument cluster. Drive to a

qualified workshop and have the fault rectified.

Otherwise, after driving the maximum distance

and switching off the engine, you will not be able

to restart the car.

Refill AdBlue from a filler nozzle ðpage 316,

canister ðpage 317 or bottle ðpage 317.

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 nec-

essary.

 AdBlue/DEF: fault. Engine cannot be restar-

ted. See owner's manual

This message appears if the system detects that

the tank has been filled with the wrong fluid or

with non-standard AdBlue or if there is a system

fault. Drive to the nearest qualified workshop

without delay and have the fault rectified. You

will not be able to restart the car after you switch

off the engine.

CAUTION

– Improper handling of AdBlue can cause

damage to the vehicle not covered by the

warranty.

– 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. Seek professional assistance.

Before refilling AdBlue

Applies to: vehicles with selective catalytic reduction

– 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.

Fig. 196 Vehicle as seen from the rear right: Unscrewing

the AdBlue cap

– Do not keep refill bottles or canisters in the

vehicle, as AdBlue can leak and damage the

vehicle interior.

The AdBlue filler neck is located immediately be-

side the diesel filler neck.

The AdBlue tank capacity on your vehicle is given

in the Technical data section ðpage 378.

– Keep AdBlue away from clothing. Wash

thoroughly with clean water should you

come into contact with this fluid.

When the instrument cluster displays the re-

quest to fill up AdBlue, fill up at least the

amount of AdBlue displayed. 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.

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

►

Park the vehicle on a level surface.

Switch off the ignition.

►

Open the fuel tank flap ðpage 312.

Fill up with AdBlue until the first time the filler

►

Unscrew the cap on the filler neck anti-clock-

nozzle cuts off the supply ð



wise ðFig. 196.

316

Checking and topping up fluids

►

Put the tank cap back on ðpage 318, After re-

filling AdBlue.

Lift the canister and then tilt it. Keep it tilted

until empty or until no more fluid runs into the

tank.

►

Turn the hose anti-clockwise to remove it.

Remove the canister and screw the tank cap

back on ðpage 318, After refilling AdBlue.

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 ð in Before refilling AdBlue

on page 316.

CAUTION

Use only refill canisters of the correct type ap-

proved for your vehicle. AdBlue may leak out

if you use another system.

– Do not use a damaged filler nozzle in case it

does not cut off the supply properly.

– 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 ð in Before refilling AdBlue on

page 316.

Note

– Your qualified workshop can tell you which

refill canisters are approved for your vehicle.

– Approved refill canisters contain about 5 li-

tres of AdBlue.

Note

Refilling AdBlue from a bottle

You can fill AdBlue from pumps for either

light passenger vehicles or heavy goods

vehicles.

Applies to: vehicles with selective catalytic reduction

►

Take the cap off the refill bottle ð

refilling AdBlue on page 316, ð

filling AdBlue on page 316.

in Before

in Before re-

Refilling AdBlue from a canister

Applies to: vehicles with selective catalytic reduction

►

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.

►

Unscrew the bottle anti-clockwise without ap-

plying pressure.

Remove the bottle and screw the tank cap back

on ðpage 318, After refilling AdBlue.

CAUTION

Fig. 197 Canister with screw-on hose

Use only refill bottles of the correct type ap-

proved for your vehicle. AdBlue may leak out

if you use another system.

►

Take the cap off the refill canister ð

fore refilling AdBlue on page 316, ð

fore refilling AdBlue on page 316.

in Be-

►

Screw the end of the hose 1 clockwise onto

the opening on the canister A .

Remove the cap 2 from the other end of the

hose B .

Fit the end of the hose 2 onto the filler neck

on the vehicle and turn clockwise as far as the

stop to secure.

Note

– Refill bottles are available from qualified

workshops.

– Approved refill bottles contain about 1.9 li-

tres of AdBlue.

317

Checking and topping up fluids -> Selective catalytic reduction (AdBlue/DEF) for Your Audi Rs Q8 SUV First Generation (2020-2026)

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