Checking and topping up fluids
– 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.
Selective catalytic
reduction (AdBlue/DEF)
Introduction
Applies to: vehicles with selective catalytic reduction
– The use of AdBlue for the operation of this vehi-
cle is required by law.
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.
Information on AdBlue
– The instrument cluster display will tell you how
far you can drive before the tank runs dry
ðpage 230, Low AdBlue level. If the AdBlue
tank runs dry, the engine cannot be started
again after you switch off the ignition. Never
run the AdBlue tank completely dry.
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.
– Please follow the AdBlue manufacturer's in-
structions for storage and use.
– Restrictions may be encountered when refilling
in very cold temperatures, because the freezing
point of AdBlue is -11 °C.
– The system is heated when the vehicle is run-
ning to ensure that the exhaust gas treatment
operates even at very low temperatures.
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.
Driver messages about AdBlue/DEF
Applies to: vehicles with selective catalytic reduction
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 ðpage 231.
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:
Checking range
The AdBlue consumption depends on the ambi-
ent and operating temperature and on how the
vehicle is driven. The estimated remaining range
can be viewed in the instrument cluster display
Low AdBlue level
A series of warnings will inform you if the
amount of AdBlue in the tank falls below a cer-
tain level. You should always fill up with AdBlue
when requested to do so on the instrument clus-
ter display.
ðpage 17, Instrument cluster controls and
ðpage 17, Fig. 2.
1
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
230
English 
