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2013 Subaru Impreza WRX STi MAF Sensor Replacement

A car's MAF sensor detects how much air is...

iFixit Library Subaru WRX Easy 5 minutes Guide 182623

Licensed iFixit integration

This attributed iFixit guide is displayed through Fixonic's recorded commercial API permission. iFixit remains the independent source and author of the procedure.

Guide overview

Before you begin

A car's MAF sensor detects how much air is entering the engine to mix with fuel for optimal performance. When it starts malfunctioning, the car might lose power, shake, or use more fuel than necessary. Luckily, a MAF sensor is easily replaceable with a few basic tools.

Step 1

Repair step

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TOOL USED ON THIS STEP MAF Sensor Referenced by the iFixit guide

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Pop, open, and prop the hood.
Locate the MAF sensor in the front of the vehicle.

Step 2

Repair step

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TOOL USED ON THIS STEP MAF Sensor Referenced by the iFixit guide

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TOOL USED ON THIS STEP Pliers Referenced by the iFixit guide

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Pull the connector straight back to detach it from the MAF sensor.
Use pliers if necessary.

Step 3

Repair step

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Twist the Allen wrench in a counter-clockwise motion to loosen both 10mm socket-head cap screws.

Step 4

Repair step

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TOOL USED ON THIS STEP MAF Sensor Referenced by the iFixit guide

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Rock the MAF sensor side-to-side. Once loose, firmly pull the sensor out of the socket.
Avoid touching the sharp bronze blades inside the sensor.

Step 5

Repair step

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TOOL USED ON THIS STEP MAF Sensor Referenced by the iFixit guide

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Insert the new MAF sensor into the socket. Apply firm, even pressure until the sensor is secure.
Line up the screw holes to make the process easier.

Step 6

Repair step

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TOOL USED ON THIS STEP MAF Sensor Referenced by the iFixit guide

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Twist the Allen wrench in a clockwise motion to tighten both 10mm socket-head cap screws.
Tightly fasten the screws to prevent the MAF sensor from falling out while the vehicle is in motion.

Step 7

Repair step

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TOOL USED ON THIS STEP MAF Sensor Referenced by the iFixit guide

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Gently push the connector into the new MAF sensor until it clicks into place.