Opening the DEF filler cap
The filler neck for DEF is behind the fuel filler flap.
The fuel filler flap is unlocked or locked automatically when you open or close the vehicle with the SmartKey or with KEYLESSGO.

- Switch off the ignition.
- Press the fuel filler flap in the direction of
arrow 1.
The fuel filler flap swings up.
- Turn blue DEF filler cap 2
counterclockwise and remove it.
DEF filler cap 2 is secured with a plastic
strap.
See also:
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When you press the button, the
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times or remains off. You can no longer switch
on the cooling with air dehumidification
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Consult a qualifi ...
Important safety notes
In order for the battery to achieve the
maximum possible service life, it must always
be sufficiently charged.
Have the battery checked regularly at a
qualified specialist workshop, such as an ...
C-Class in the Market
Second only to the 3 Series in terms of sales popularity, the C-Class takes a
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