The mass air flow sensor (commonly abbreviation to MAF) is among the most important engine monitoring sensors. A bad mass air flow sensor deserve to leave her Subaru Outback’s engine running rough, or even inoperable.

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A MAF sensor procedures the density of the wait entering the entry manifold. It overcome this details onto her Outback’s ECU. The ECU uses this information together with other sensor data to regulate the lot of fuel the enters the burning chamber.


If friend do recognize that you need a new mass airflow sensor, they aren’t as well expensive. And, many of the moment they are best by the air box and also easy come replace.

Faulty Mass air flow Sensor Symptoms: Subaru Outback

When the mass air flow sensor has actually gone bad, you’ll definitely feel it. Right here are the most usual symptoms the a negative or failing MAF sensor:

Idle Issues– your Outback might run affluent or lean when idling, or the may additionally idle erratically. A rich condition is once there is not enough air family member to the fuel in the air/fuel mixture. The exhaust shade is typically darker once running rich. A lean problem is when there is too lot air loved one to fuel in the wait fuel mixture. The exhaust color usually doesn’t change. Hard come Start– Without discovering the proper amount of wait entering into the intake, it have the right to be really daunting for the engine come start. And also when it does, that doesn’t generally run very well. Decreased Fuel Mileage– Fuel mileage can suffer without the ideal air/fuel mixture.
Here a pair of common MAF sensor layouts

Outback poor MAF Sensor Diagnosis

If the MAF sensor has gone bad, it’ll cause the check engine light and carry out an OBDII trouble code. This is an excellent because it helps you narrow under the problem. The 2 most typical trouble password in relationship to the MAF sensor are:

There are other codes regarded the mass air flow sensor together well, yet these space the most typical ones. Here’s a great video on exactly how to diagnose a negative MAF sensor using a multimeter indigenous Ratchets and Wrenches ~ above YouTube.

Cleaning the Mass airflow Sensor

Often, the mass air flow sensor really only requirements cleaning once they go bad. Part folks recommend making use of alcohol due to the fact that it’s usually on hand, and also can clean the sensor. This is a poor idea, the can destroy the sensor. Offers mass airflow sensor cleaner. It’s really cheap and available at any parts store. It certain beats the heck out of having to purchase a new sensor.

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Locate the MAF Sensor– It’ll it is in in between the waiting filter and the throttle body. Remove the Sensor- Take care not to damage the wiring exploit or the connector pins that obtain the harness in the MAF. Basic hand tools will it is in all the you need to complete the job. Clean the Sensor– now that you’ve gotten rid of your Outback’s MAF sensor, it’s time come clean it. You’ll require the MAF cleaner. You are not scrubbing anything. Let the chemicals carry out their job. Around a dozen small bursts will certainly be all that you need. Replace the Sensor


Replacing a negative MAF sensor have the right to make her Outback feel like a brand-new vehicle. Great luck v the diagnosis. If over there is anything that you would prefer to add, you re welcome feel cost-free to leave a comment below.