Introduction
Applicable to all engines (H4D and H4Bt).
Replace every: 20,000km or year. It should be replaced earlier if driving in dusty environments.
A clogged engine air filter may impact fuel economy: it will create more resistance and therefore, increase the pumping losses.
Note: recommendations are given according to the French RTA's (Revue Technique Automobile) maintenance plan, matching Smart 453's maintenance plan in this case.
What you need
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Unscrew the 6 screws by hand or with a T50 socket.
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Lift and set aside the engine hood.
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Unscrew the 2 Torx T25 screws.
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Disglog the air filter lig by slightly pushing/pulling it forward then lifting it.
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Extract the used air filter.
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Dust off the air box from any debris residing in it.
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Install the new air filter.
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Replace the lid by sliding the two notches.
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Screw back the two T25 Torx screws while maintaining a slight pression on the lid.
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