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Engine air filter replacement

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Time Required: 10 minutes
Difficulty: Easy
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Engine air filter replacement

Introduction

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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

    1. Engine air filter replacement, Accessing the engine hood: step 1, image 1 of 1
      • Open the trunk.

      • Remove the trunk carpets.

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    2. Engine air filter replacement, Acessing the engine compartment: step 2, image 1 of 1
      • Unscrew the 6 screws by hand or with a T50 socket.

      • Lift and set aside the engine hood.

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    1. Engine air filter replacement, Disassembling the airbox: step 3, image 1 of 2 Engine air filter replacement, Disassembling the airbox: step 3, image 2 of 2
      • Unscrew the 2 Torx T25 screws.

      • Disglog the air filter lig by slightly pushing/pulling it forward then lifting it.

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      • Extract the used air filter.

      • Dust off the air box from any debris residing in it.

      • Optionnal but recommended: proceeed to a throttle body, MAP sensor and air manifold thermometer cleaning (see other tutorials).

      • Install the new air filter.

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    2. Engine air filter replacement, Reassembling the air box: step 5, image 1 of 2 Engine air filter replacement, Reassembling the air box: step 5, image 2 of 2
      • Replace the lid by sliding the two notches.

      • Screw back the two T25 Torx screws while maintaining a slight pression on the lid.

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Conclusion

Congratulations ! You replaced your engine air filter

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Past 24 Hours: 4

Past 7 Days: 20

Past 30 Days: 107

All Time: 2,450