F 53 30
Replace filter element
A
Check the area around the seal and filter
housing for any leaks. DEF leaks leave
white deposits. Comply with section on
"Cleaning and checking for reusability".
A
Remove loose foreign particles with
compressed air. Remove soiling with
a clean damp cloth to ensure no soiling
can land in the DEF dosing unit.
m
Even tiny quantities of dirt particles and
soiling can damage the DEF dosing sys-
tem. No dirt or other foreign bodies may
land in the DEF dosing unit.
- Place a suitable container under the
filter housing to catch any AdBlue
®
/
DEF residues.
- Unscrew housing (D) (46 mm wrench).
- Remove anti-freeze membrane (C) and proceed with visual inspection. A small
quantity of DEF could leak at this point.
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