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Autopapyrus · Mercedes-Benz A-Class (W168)
https://autopapyrus.com/guides/mercedes-benz/a-class/air-filter-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Mercedes-Benz A-Class (W168): Air Filter Replacement

The air filter on a Mercedes-Benz A-Class W168 with the M166 1.9 L engine should be replaced every 30,000-40,000 km or every 2 years. The procedure is simple and needs no special tools. The air filter housing on the W168 is located in the engine bay and has a distinctive design with a yellow locking lever.

Difficulty: Easy Time: 10-15 minutes Steps: 10 Tools: None required (a screwdriver may be needed on some versions)

Part

№PartAlternatives
01 Air filter Mercedes-Benz MANN, MAHLE, Bosch
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes and 7 more. See manuals →

Step by step

10 steps
  1. Open the hood and find the air filter housing to the right of the engine (a black plastic box).
  2. Lift the yellow locking lever on the filter housing all the way up.
  3. Slide the filter housing sideways to release it from the three guide slots.
  4. Remove the housing cover and take out the old filter element.
  5. Clean the inside of the housing with a dry rag to remove dust and debris.
  6. Check the condition of the sealing ring on the mass airflow sensor connection (the large black rubber ring). If necessary, lightly lubricate it with silicone grease to ensure a good seal.
  7. Install the new filter element in the housing, making sure it is oriented correctly (the filter ribs should run vertically).
  8. Close the housing cover.
  9. Place the housing back onto the three guide slots, making sure it is properly aligned.
  10. Lower the yellow lever to lock the housing in place.

Common mistakes and warnings

  • When reinstalling the housing, be sure to check that it seats correctly in the guide slots
  • Incorrect installation will let unfiltered air in and cause accelerated wear of the cylinder and piston assembly
  • Do not use cheap filters of unknown origin, because poor filtration lets abrasive particles into the combustion chamber