Display messages
Possible causes/consequences and MM Solutions
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dEF ChkdEF Chk
In addition, the yellow å DEF indicator lamp lights up and a
warning tone sounds.
The DEF supply has dropped below 1.5 US gal (5.5 l).
After the message appears for the first time, and under normal
driving conditions, the remaining DEF supply will last for approx-
imately 1000 miles (1600 km).
After that, the 0.8 US gal (3.0 l) reserve mark is reached. A warning
tone sequence sounds and the engine can then only be started
another 16 times.
X
Add DEF (Y page 147).
The å DEF indicator lamp disappears after no more than
20 seconds after the vehicle has stopped or you have switched
on the ignition or started the engine after refueling.
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StArtS RExxStArtS RExx
In addition, the yellow å DEF indicator lamp lights up and a
warning tone sequence sounds.
After the message appears for the first time, the engine can only be
started another 10 times.
The number of remaining engine starts XXXX (1010 to 00) is shown in the
message every time the engine is started. When the number of
remaining engine starts is 00 the engine management prevents the
vehicle being driven at a speed exceeding 5 mph (8 km/h). The
Idle ModeIdle Mode message appears in the multifunction display.
The DEF reducing agent is contaminated, diluted or is not compli-
ant with ISO 22241.
X
Have the DEF tank cleaned and refilled at a qualified specialist
workshop as soon as possible.
The exhaust gas aftertreatment is malfunctioning or an emission
relevant malfunction has occurred. This malfunction or defect can
damage the exhaust gas aftertreatment.
X
Visit a qualified specialist workshop immediately.
Display messages
201
On-board computer and displays
Z
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