Air filter change SMART ForFour 2004 - 2008 | Haynes Manuals
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Air filter location
Undo the two retaining clips on the air filter body, as shown here
Carefully separate and remove the air filter chamber
Air filter in position
Lift out the air filter
Clean off any debris on the surface of the filter. Replace with a new filter if heavily contaminated
Reassemble the air filter housing
Undo the circular clip on the air intake
Now separate the air intake from the air filter chamber
Check the air filter chamber for any dust or debris. Clean with a paper towel if required