Mass Airflow Sensor Insert 4-Pin EJ205 EJ207 EJ20 - Fits Subaru Forester Impreza WRX STi

If your Subaru is stumbling at idle, surging under load, or your mechanic has flagged a faulty MAF sensor, you have found the right fix.

This is a direct-fit aftermarket OEM replacement insert for the air intake pipe - no wiring modifications, no coding, just unplug the old one and connect this one. Stocked in Victoria and ready to go, so you are not left waiting.

To Suit

• This MAF sensor insert suits a wide range of Subaru Forester and Impreza models built between 1992 and 2008.
• It covers the Forester SF5 and SG5 series including S Turbo variants with EJ202 and EJ205 engines, and the full Impreza GC8, GD, GF8, GG and GDA/GDB/GGA series spanning EJ20, EJ201, EJ204, EJ205, EJ207, EJ251, EJ255 and EJ257 engines - including the iconic WRX and WRX STi.
• This is a bolted insert unit that fits into the air intake pipe and uses the existing 4-pin oval connector on your vehicle.

Important Fitment Check

This listing is for the MAF sensor insert only - it does not include the outer housing. The connector is a 4-pin oval shape so confirm your original plug matches before ordering. Subaru used more than one MAF specification across these model years so please check that your original unit carries OEM number 22680-AA301 to confirm this is the correct insert for your vehicle.

Replaces Part Numbers

• 22680-AA301
• 22680-AD210
• 22794-AA010
• 22680-AD21A

Other Part Numbers

• NTK-AU: AFT5-V010
• GOSS: AMAA301N
• BLUE PRINT: ADN174210
• VDO: A2C59506194

Package Includes

• 1 x Mass Airflow Sensor Insert (4-pin oval plug) - insert only without housing. Check image and confirm OEM number before ordering.

About This Part

The mass airflow sensor measures the volume and density of air entering the engine and sends that data to the ECU in real time. The ECU uses this signal to calculate the correct fuel delivery for every driving condition - from cold starts to full throttle. This aftermarket OEM replacement operates at 12V and is a bolted-mount insert positioned in the air intake pipe with a 4-pin oval connector and 2 mounting bores matching the original specification.

Common Symptoms of Failure

• Rough or unstable idle that comes and goes
• Engine hesitation or stumbling when accelerating
• Check engine light on - often logged as MAF-related fault codes
• Rich or lean fuel mixture causing black smoke or poor fuel consumption
• Engine stalling unexpectedly especially from cold
• Reduced power or flat spots through the rev range on EJ20 and EJ205 engines

Note: Verify fitment using the OEM part number before ordering.