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By YOUCANIC on Feb 15, 2019

Subaru Mass Air Flow Sensor

In this guide, you will learn about common symptoms caused by a bad Subaru mass air flow (MAF) sensor and how to replace it yourself. 


Here are some of the most common symptoms of a defective 

  • Subaru Check engine light on
  • Engine runs rough or shakes
  • Engine misfire detected
  • Poor fuel economy
  • Cruise Control Light on
  • Engine hesitates under load or at idle 
  • Engine struggles to start 
  • Rough idle
  • Code P0101, P0171, P0174 or P0102

How to change Subaru Mass Air Flow Sensor

What you will need

Parts Required

Tools Needed

  • Philips Screwdriver


  1. Park your Subaru and turn off the ignition. Set the parking brakes. getting ready to change subary mass air flow sensor


  2. Pull the hood release to open the hood. 
    Video file
  3. Locate Subaru mass air flow sensor to the engien air filter housing. subaru mass air flow sensor location


  4. Unplug the electical connector by pressing on the sensor and pulling it away. change subaru  subary mass air flow sensor
  5. Remove two screws that hold the sensor in place. remove subaru air flow senosr


  6. Install the new sensor and plug in the wire harness. Start the car to make sure there are no performance issues. You will need to use an OBD-II scanner to reset the check engine light. start subaru check that no cel is on


A bad Subaru MAF sensor can cause different check engine codes such as P0300 or code for the O2 sensor, air volume or something else. Problems with the MAF sensor are sometimes caused by a corroded or damaged wire harness to the sensor itself. 


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