Engine air filter replacement

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Введение

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.

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1. Шаг 1 Accessing the engine hood
  Open the trunk.
  
  Remove the trunk carpets.
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2. Шаг 2 Acessing the engine compartment
  Unscrew the 6 screws by hand or with a T50 socket.
  
  Lift and set aside the engine hood.
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1. Шаг 3 Disassembling the airbox
  Unscrew the 2 Torx T25 screws.
  
  Disglog the air filter lig by slightly pushing/pulling it forward then lifting it.
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2. Шаг 4 Replacing the air filter
  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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3. Шаг 5 Reassembling the air box
  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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