Display messages
Possible causes/consequences and
M
M
Solutions
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 134). 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 igni‐
tion 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
maximum speed of 5 mph (8 km/h).
#
Add at least 2.5 gal (9.5 l) of DEF (
/
page 134).
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
instrument 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
instrument 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 defect can
damage the exhaust gas aftertreatment system.
After the message appears for the first time, the engine can only be
started another 10 times. The number of remaining engine starts
XX
(10 to 1) is shown in the message every time the engine is started.
#
Visit a qualified specialist workshop immediately.
¯
Additive System Fault
Emergency Op.: XXX
mph See Operator's
Manual
* In addition, the yellow
;
Check Engine warning lamp on the
instrument cluster lights up and a warning tone sounds.
You can only drive the vehicle at a maximum speed of 5 mph
(8 km/h).
#
Visit a qualified specialist workshop immediately.
Display messages and warning and indicator lamps 301
