Date registered: Aug 2002
Vehicle: '85 2.3-16 '99 C280 '11 GLK350
Location: Scottsdale, Arizona, USA
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That's a rather non-helpful reply. The engine air filter is within the air filter housing, a black plastic box which has a flexible hose leading from it to the intake system of the engine. To access the box, you will need to loosen the hose clamp(s) screws with a screwdriver.
After opening, remove the filter and vacuum the inside of the filter box. Put in the new filter.