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Problems with the fuel and fuel tank
Problem
Fuel is leaking from the
vehicle.
The engine does not
start.
DEF
Notes on DEF
* NOTE When you open the DEF tank,
small amounts of ammonia vapor may
escape.
Only fill the DEF tank in well-ventilated
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areas.
Do not let DEF come into contact with
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skin, eyes or clothes.
Keep DEF away from children.
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* NOTE Do not ingest DEF.
If DEF is swallowed:
Immediately rinse out your mouth thor‐
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oughly.
Drink plenty of water.
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Seek medical attention immediately.
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Possible causes/consequences and
The fuel line or the fuel tank is defective.
Apply the parking brake.
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Switch off the engine.
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Remove the key from the ignition lock.
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Or, on vehicles with KEYLESS‑GO:
Open the driver's door.
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The on-board electronics are in position g. This corresponds to the
"key removed".
Do not restart the engine under any circumstances.
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Consult a qualified specialist workshop.
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The fuel tank has been run completely dry.
Refuel the vehicle with at least 1.3 gal (5 l) of fuel.
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Switch the ignition on for approximately ten seconds.
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Start the engine continuously for a maximum of ten seconds until it
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runs smoothly.
If the engine does not start:
Switch the ignition on for approximately ten seconds.
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Start the engine continuously for a maximum of ten seconds until it
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runs smoothly.
If the engine does not start after three attempts:
Consult a qualified specialist workshop.
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* NOTE Damage caused by additives in
The DEF exhaust gas aftertreatment system
could be destroyed by the following:
R
R
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* NOTE Damage and malfunctions caused
Impurities in DEF result in the following:
R
R
R
Driving and parking 127
M M
Solutions
DEF or by diluting DEF
Additives in DEF
Diluting DEF
Only use DEF in accordance with ISO
22241.
Do not mix additives.
Do not dilute DEF.
by impurities in DEF
Higher emission values
Damage to the catalytic converter
Engine damage
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