F 53 31
- Pull filter element (B) out of the unit.
To do so, pull and turn at the same
time. Take up any dripping DEF. Use
a dry, clean, lint-free cloth. Dry unit.
Dispose of anti-freeze membrane and
filter element.
- If there is a risk that soiled DEF has
flowed through the DEF dosing sys-
tem, check the DEF filter prior to dis-
posal. Check the filter of the dosing
unit for signs of soiled DEF. Use the
appearance and smell of the filter to
ascertain whether soiled fluid has
flowed through the dosing system.
Contact the service department if nec-
essary. Check the DEF filter for soil-
ing. On finding soiling, check
the following:
DEF tank filter. Inlet connection of the
DEF dosing unit: Contact the service
department if necessary.
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