Operating the vehicle
133
Controls in detail
If the speed falls below 5 mph (8 km/h),
the monitor switches on again.
On vehicles with a reverse warning feature,
a warning signal sounds when reverse gear
is engaged to alert other road users.
The volume of the warning signal can be
reduced for nighttime operation.
E Reducing the volume: select reverse
gear twice in quick succession.
The warning signal sounds more
quietly.
i The warning signal always sounds at normal
volume and must be turned down again every
time reverse gear is engaged.
The exhaust gas aftertreatment requires a
reducing agent, Diesel Exhaust Fluid (DEF),
in order to function correctly. Filling up
with DEF is normally part of the mainte-
nance service. DEF consumption depends
on the driving and operating conditions
and must not last until the next mainte-
nance due date. Refill the DEF tank regu-
larly when operating the vehicle or at the
latest after receiving the first warning mes-
sage via the on-board computer.
Filling up and operating the vehicle with
DEF is required in order to comply with
emissions laws and regulations. If you at-
tempt to operate the vehicle without DEF,
diluted DEF or another reducing agent, the
engine management recognizes this and,
after first displaying warning messages,
prevents the engine from being restarted.
If the DEF level falls below 1.5 US gal
(5.5 l), an initial warning message is dis-
played and a warning tone sounds. After
the message appears for the first time, and
under normal driving conditions, the re-
maining DEF supply will last for approxi-
mately 1000 miles (1600 km) until you
reach the reserve mark.
After that, the 0.8 US gal (3.0 l) reserve
mark range is reached and you receive the
next warning message and a warning tone
sequence sounds. After the first message,
the DEF reserve will last for approximately
1200 mi (1,900 km). You will subsequently
be able to start the engine a further 20
times.
Reverse warning feature
G Warning
The reverse warning feature signal could be
ignored by other road users. For this reason,
the reverse warning feature cannot guaran-
tee that there are no people or objects be-
hind your vehicle.
The reverse warning feature is a system
which helps you ensure the safety of other
road users. However, it does not relieve you
in any way from the responsibility of person-
ally ensuring that there are no people or ob-
jects behind your vehicle when reversing.
For this reason, always observe the road and
traffic conditions with due caution. Make
sure that there are no people or objects be-
hind your vehicle when reversing, in order to
avoid injuring people or damaging property. If
necessary, ask someone to direct you when
maneuvering.
Operating the vehicle
Exhaust gas aftertreatment
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