Display messages
Possible causes/consequences and
M
Solutions
å
Refill Additive See Opera-
tor's Manual
* In addition, the yellow
å
DEF indicator lamp lights up on the
instrument cluster and a warning tone sounds.
The DEF supply has fallen below the first warning threshold.
#
Add at least 2.5 gal (9.5 l) of DEF (
/
page 135).
The
å
DEF indicator lamp only disappears when the vehicle is
stationary, at the latest after 20 seconds, as soon as you switch
on the ignition or start the engine after topping up.
å
Refill Additive Starts
until Emerg. Op.: XXX
See Operator's Manual
* In addition, the yellow DEF indicator lamp lights up and a warning tone
sounds.
The DEF supply has fallen below the reserve mark.
After the message appears for the first time, the remaining DEF sup-
ply will last for approximately 1200 miles (1900 km). The engine can
then only be started another 16 times. The number of remaining
engine starts
XX
(16 to 1) is shown in the message every time the
engine is started.
#
Add at least 2.5 gal (9.5 l) of DEF (
/
page 135). The
å
DEF
indicator lamp only disappears when the vehicle is stationary, at
the latest after 20 seconds, as soon as you switch on the ignition
or start the engine after topping up.
å
Refill Additive Emer-
gency Op.: XXX mph See
Operator's Manual
* In addition, the yellow DEF indicator lamp
å
lights up on the
instrument cluster and a warning tone sounds.
If the
Refill Additive Emergency Op.: XXX mph See Operator's Man-
ual
display message is shown, you can only drive the vehicle at a max-
imum speed of 5 mph (8 km/h).
#
Add at least 2.5 gal (9.5 l) of DEF (
/
page 135).
The DEF indicator lamp
å
only disappears when the vehicle is
stationary, at the latest after 20 seconds, as soon as you switch
on the ignition or start the engine after refilling.
¯
Additive System Fault
See Operator's Manual
* In addition, the yellow
;
Check Engine warning lamp on the instru-
ment cluster lights up and a warning tone sounds.
The DEF reducing agent is contaminated, diluted or is not compliant
with ISO 22241.
#
Have the DEF supply tank cleaned and refilled at a qualified spe-
cialist workshop as soon as possible.
¯
Additive System Fault
Starts until Emerg. Op.:
XXX See Operator's Man-
ual
* In addition, the yellow
;
Check Engine warning lamp on the instru-
ment cluster lights up and a warning tone sounds.
The DEF reducing agent is contaminated, diluted or is not compliant
with ISO 22241.
The exhaust gas aftertreatment system is defective or an emissions-
relevant malfunction has occurred. This malfunction or fault can dam-
age the exhaust gas aftertreatment system.
After the message appears for the first time, the engine can be star-
ted another 10 times. The number of remaining engine starts
XX
(10
to 1) is shown in the message every time the engine is started.
#
Consult a qualified specialist workshop immediately.
314 Display messages and warning and indicator lamps
