Subaru OEM Oxygen Sensor | 22641AA25A

Overview

The Genuine Subaru OEM Oxygen Sensor (Part #22641AA25A) is a factory-replacement upstream or downstream O2 sensor designed specifically for the H6 EZ30 horizontally-opposed six-cylinder engine. Engineered to OEM specifications, this sensor ensures precise air-fuel ratio monitoring, optimal engine performance, and emissions compliance for 2005–2007 and 2009 Subaru Outback and 2009 Subaru Legacy H6 owners. Choosing a Genuine Subaru oxygen sensor guarantees an exact fit and the same reliability as the sensor that came in your vehicle from the factory.

Key Features & Benefits

• Genuine Subaru OEM Quality — Manufactured to factory specifications for the EZ30 H6 engine, ensuring reliable and accurate exhaust gas sensing with no adaptation or modification required.
• Exact-Fit Replacement — Direct plug-and-play fitment; matches factory connector, thread pitch, and sensor length to eliminate guesswork and installation headaches.
• Precise Air-Fuel Ratio Control — Delivers accurate oxygen level readings to the ECU, supporting efficient combustion, maximum fuel economy, and reduced emissions.
• Protects Engine Health — A failed or degraded O2 sensor can cause rough idle, poor mileage, and catalyst damage; replacing with OEM ensures your engine management system operates as designed.
• Factory Warranty Eligible — Backed by Subaru's genuine parts warranty for peace of mind.
• Emissions System Integrity — Helps maintain proper catalytic converter function and keeps your vehicle within emissions standards.

What's Included

• 1x Genuine Subaru Oxygen Sensor (Part #22641AA25A)

Specifications

Fitment & Compatibility

This Genuine Subaru Oxygen Sensor (22641AA25A) is designed exclusively for the EZ30 H6 engine and fits the following vehicles:

2009 Subaru Legacy

2005-2007 Subaru Outback

2009 Subaru Outback

Note: This sensor is specific to the 6-cylinder EZ30 engine. Verify your engine code before ordering. It is not compatible with 4-cylinder EJ-series Outback or Legacy models.

Installation

This oxygen sensor is designed as a direct OEM replacement and installs in the same location as the original factory sensor. Basic installation requires an O2 sensor socket and standard hand tools. Anti-seize compound is recommended on the threads if re-using a sensor bung. If the sensor is located in a tight or heat-exposed area of the exhaust, professional installation is advised. Always allow the exhaust system to cool completely before beginning work.