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.

Subaru Forester SF5 2.0L EJ202 (08/1997 - 09/2002)
Subaru Forester SF5 S Turbo 2.0L EJ205 (09/1998 - 07/2002)
Subaru Forester SG5 S Turbo 2.0L EJ205 (02/2002 - 12/2008)
Subaru Impreza GC8 WRX 2.0L EJ20 Turbo / EJ20G (11/1992 - 09/1998)
Subaru Impreza GC8 WRX 2.0L EJ205 (09/1998 - 10/2000)
Subaru Impreza GD9 i 2.0L EJ201 (09/1999 - 12/2007)
Subaru Impreza GDA WRX Turbo 2.0L EJ205 (12/2002 - 03/2007)
Subaru Impreza GDB WRX STi 2.0L EJ207 (11/2001 - 09/2005)
Subaru Impreza GDE i 2.5L EJ251 (01/2001 - 09/2005)
Subaru Impreza GDF 2.5L EJ257 (10/2005 - 04/2007)
Subaru Impreza GDG WRX 2.5L EJ255 (10/2005 - 12/2007)
Subaru Impreza GF8 WRX 2.0L EJ20 Turbo / EJ20G (02/1994 - 09/1998)
Subaru Impreza GF8 WRX 2.0L EJ205 (09/1998 - 10/2000)
Subaru Impreza GG9 i 2.0L EJ201 (12/2000 - 06/2007)
Subaru Impreza GG9 i 2.0L EJ204 (12/2000 - 06/2007)
Subaru Impreza GGA WRX 2.0L EJ205 (12/2002 - 12/2006)
Engine codes covered: EJ20 / EJ20G / EJ201 / EJ202 / EJ204 / EJ205 / EJ207 / EJ251 / EJ255 / EJ257

Can I clean my MAF sensor instead of replacing it?

Yes - if the sensor is contaminated rather than electrically failed, cleaning with a dedicated MAF sensor cleaner spray can restore correct readings. Do not use brake cleaner or generic electrical contact cleaner as these leave residue that damages the sensing wire. Allow the sensor to dry completely before reinstalling. If cleaning does not resolve the fault codes, the sensor requires replacement.

What is the difference between a MAF sensor and a MAP sensor?

A MAF (Mass Air Flow) sensor directly measures the mass of air entering the engine using a hot wire element in the intake. A MAP (Manifold Absolute Pressure) sensor measures intake manifold pressure to calculate air density. Most modern engines use one or the other - some use both. Your vehicle service manual or OBD2 fault codes will confirm which sensor type your engine uses.

Will a faulty MAF sensor cause my vehicle to fail an emissions test?

Yes. A faulty MAF sensor causes the ECU to miscalculate fuel delivery, typically resulting in a rich running condition that increases CO and hydrocarbon emissions. Most roadworthy and emissions checks will fail a vehicle with an active MAF sensor fault code or visibly excessive exhaust smoke.

What are the symptoms of a bad MAF sensor?

Common symptoms include rough idle, hesitation or stumbling on acceleration, poor fuel economy, black smoke from the exhaust, and an illuminated Check Engine light. Your ECU may log fault codes P0100 to P0104.

Can I drive with a faulty MAF sensor?

You can drive short distances but it is not recommended. A faulty MAF sensor causes the ECU to run incorrect fuel mixtures, which can damage the catalytic converter and O2 sensors over time. Have it replaced as soon as possible.

How do I test if my MAF sensor is bad?

Use an OBD2 scanner to check for fault codes P0100-P0104. You can also use a multimeter or live data scanner to check the sensor output voltage against your vehicle's specification. A reading significantly outside spec confirms a faulty sensor.

What causes a MAF sensor to fail?

The most common causes are a dirty or contaminated sensing element (often from a missing or damaged air filter), oil contamination from an over-oiled aftermarket air filter, heat damage, or general wear over time.

Do I need to reset my ECU after replacing the MAF sensor?

It is good practice to clear any stored fault codes using an OBD2 scanner after replacement. Some vehicles will self-adapt within a short drive cycle, but clearing codes ensures the ECU recalibrates from a clean baseline.

Identification
SKU	CAF032-Subaru
Brand	OEM
Part Numbers
Part Number	CAF032
Reference OEM Number	22680-AA301
Other OEM Numbers	22680-AA301, 22680-AD210, 22794-AA010, 22680-AD21A
Related Part Numbers	AM104, AMAA301N
Trade Part Numbers	BLUE PRINT: ADN174210, VDO: A2C59506194
Product Specifics
Product Type	SENSOR
Sensor Type	Mass Airflow Sensor
Type	MAF Sensor
Number of pins	4
Connector Shape	oval
Housing Colour	Black
Housing Type	without housing
Compatible Makes	Subaru
Fitment Type	Direct Fit
Other Details
Note	Always verify fitment using your vehicle's OEM part number.