Problems with the fuel and fuel tank
Problem
Possible causes/consequences and
M
M
Solutions
Fuel is leaking from the
vehicle.
G
WARNING
The fuel line or the fuel tank is faulty.
There is a risk of fire or explosion.
X
Apply the electric parking brake.
X
Switch off the engine.
X
Remove the key from the ignition lock.
or, on vehicles with KEYLESS-GO start function or KEYLESS
‑
GO:
X
Open the driver's door.
The on-board electronics now have status 0. This is the same as the
key having been removed.
X
Do not restart the engine under any circumstances.
X
Consult a qualified specialist workshop.
The engine does not
start.
The fuel tank of a vehicle with a diesel engine has been run completely
dry.
X
Refuel the vehicle with at least 5 litres of diesel.
X
Turn the ignition on for approximately ten seconds (
Y
page 145).
X
Start the engine continuously for a maximum of ten seconds until it
runs smoothly.
If the engine does not start:
X
Turn the ignition on again for a maximum of ten seconds
(
Y
page 145).
X
Start the engine again continuously for a maximum of ten seconds
until it runs smoothly.
If the engine does not start after three attempts:
X
Consult a qualified specialist workshop.
The fuel filler flap cannot
be opened.
The fuel filler flap is not unlocked.
X
Unlock the vehicle (
Y
page 81).
The key battery is discharged or nearly discharged.
X
Unlock the vehicle using the emergency key element (
Y
page 82).
The fuel filler flap is unlocked, but the opening mechanism is jammed.
X
Consult a qualified specialist workshop.
AdBlue
®
(BlueTEC vehicles only)
General notes
To function properly, BlueTEC exhaust gas after-
treatment must be operated with the reducing
agent AdBlue
®
.
On vehicles with an 8.5 l AdBlue
®
tank, topping
up AdBlue
®
is not part of the maintenance work.
Under normal operating conditions, a full tank of
AdBlue
®
should last until the next service due
date.
When the supply of AdBlue
®
is down to approx-
imately 3.0 litres, the
Refill AdBlue See
Refill AdBlue See
Refuelling
169
Driving
and
parking
Z