Subaru Mass Air Flow Sensor | Symptoms | Replacement

Is your Subaru check engine light on because of a faulty Mass Airflow Sensor? Learn the symptoms of a bad mass airflow sensor and how to replace it by following the procedures below.

Symptoms

Common symptoms of a defective MAF sensor on a Subaru:

• Check engine light stays on
• The engine runs rough or shakes
• Engine misfire detected
• Poor fuel economy
• The cruise control light may come on.
• Engine hesitates under load or at idle.
• The engine struggles to start
• Rough idle

A faulty Subaru MAF sensor will trigger fault codes such as P0101, P0171, P0174, or P0102.

How to replace Subaru MAF Sensor

Replacing the MAF sensor on a Subaru is very easy and takes less than 30 minutes.

What you will need

Procedure

1. Park the Subaru and turn off the ignition. Set the parking brakes. 
2. Pull the hood release to open the hood.
3. Locate the Subaru mass airflow sensor in the engine air filter housing. 
4. Unplug the electrical connector by pressing on the sensor and pulling it away. 
5. Remove two screws that hold the sensor in place. 
6. Install the new sensor and plug in the wire harness. Start the car to make sure there are no performance issues. If no other fault codes are present, the check engine light should reset in two to three days. Connect an OBD-II scanner, like the YOUCANIC Full System Scanner, to the diagnostic port under the dashboard to read other codes or immediately reset the check engine light.

A bad Subaru MAF sensor can trigger various check engine codes such as P0300 or code for the O2 sensor, air volume, or something else. While it is possible to clean the MAF sensor, cleaning the MAF sensor does not always work. If you clean the MAF sensor, use the MAF Sensor Cleaner.

Problems with the MAF sensor can be challenging to diagnose, especially if a corroded or damaged wire harness causes them to the sensor itself.

The YOUCANIC Full System Scanner can read and clear fault codes through every control module of your Subaru vehicle.

We hope you find the Subaru Mass Air Flow Sensor | Symptoms | Replacement guide helpful. Check these troubleshooting and repair guides for more help on your Subaru.