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Autopapyrus · Mitsubishi Outlander II (CW) 2.4 (4B12) (2010)
https://autopapyrus.com/guides/mitsubishi/outlander/engine-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.

Mitsubishi Outlander II (CW) 2.4 (4B12) (2010): Engine Air Filter Replacement

The 4B12 air filter sits in a plastic housing in the engine bay and is held by several clips. The replacement interval is about 30,000 km (18,000 mi) or every 2 years, and more often in dusty conditions. The job is simple and does not require removing any neighboring components.

Difficulty: Easy Time: 10-15 minutes Steps: 9 Tools: Usually none needed (the housing uses clips); a Phillips screwdriver in case the housing has screws. Vacuum cleaner or dry rag for cleaning the housing.

Part

  • 🔩 Engine air filter (panel type, rectangular) for the Outlander CW 2.4 — OEM Mitsubishi or aftermarket Mann, Filtron, Bosch, Denso. The exact OE part number is not given here to avoid a mistake. Match the part by VIN and by the dimensions of your old filter at the parts store
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes AutoFix (online) and 2 more. See manuals →

Step by step

9 steps
  1. Shut off the engine, let it cool down, open the hood and secure it with the prop rod.
  2. Find the black plastic air filter housing in the engine bay. The intake duct runs from it to the throttle body.
  3. Release the housing cover. Unlatch the metal or plastic clips along the edges. If there are screws instead, remove them. Use moderate force, as plastic becomes brittle with age.
  4. Lift the cover and move it aside. Do not disconnect the mass airflow sensor connector or the duct if you can avoid it. If the cover is in the way, carefully disconnect the sensor connector by pressing the locking tab, and do not touch the sensing element.
  5. Take out the old filter and note its position: the sealing rim must seat in the housing groove the same way.
  6. Clean the inside of the housing with a vacuum cleaner or a dry rag. Make sure no debris gets into the intake tract on the clean side.
  7. Install the new filter with its sealing rim in the housing groove. It must lie flat, without skewing or gaps around the perimeter.
  8. Close the cover, make sure it is seated all the way around, and snap all the clips shut or tighten the screws. Reconnect the sensor connector if you disconnected it.
  9. Check that the duct is firmly seated on the housing and the clamps have not loosened. Start the engine, listen for unusual noises and make sure no warning lights appear on the dash.

Common mistakes and warnings

  • Do not drive without a filter, and do not fit a "zero-restriction" filter without need: dust quickly wears the cylinders and contaminates the mass airflow sensor. Never touch the sensing element of this sensor. If the Check Engine light comes on after replacement or the engine runs roughly, check the sensor connector and the seating of the housing cover.