Subaru OEM Oxygen Sensor Forester XT 2004-2008 / STI 2004-2007 / WRX 2006-2007 | 22641AA450

Overview

The Genuine Subaru OEM Air/Fuel Ratio Oxygen Sensor (Part #22641AA450) is the factory-replacement upstream oxygen sensor designed for 2004–2007 Subaru STI, 2006–2007 Subaru WRX, and 2004–2008 Subaru Forester XT models. As an authentic OEM component, it delivers the precise air/fuel mixture readings your engine management system depends on for optimal fuel economy, clean emissions, and peak performance. Choosing a Genuine Subaru part ensures an exact factory fit with no calibration or adaptation required.

Key Features & Benefits

• Genuine Subaru OEM Quality — Manufactured to Subaru's factory specifications, guaranteeing the same performance and reliability as the original sensor installed at the factory.
• Exact-Fit Replacement — Direct plug-and-play fitment with no wiring modifications, bracket fabrication, or adapter needed; connector and thread pitch match OEM exactly.
• Accurate Air/Fuel Ratio Monitoring — Wideband-style AF sensor provides precise lambda readings across a broad mixture range, enabling your ECU to maintain ideal combustion for turbocharged EJ engines.
• Protects Engine & Catalytic Converter — A properly functioning AF sensor prevents rich or lean conditions that can cause catalytic converter damage, increased emissions, and reduced engine life.
• Restores Fuel Efficiency & Throttle Response — Replaces a degraded sensor to recover lost fuel economy and eliminate hesitation or rough idle caused by faulty oxygen feedback.
• Factory Warranty Coverage — Backed by Subaru's genuine parts warranty for peace of mind.

What's Included

• 1× Genuine Subaru Air/Fuel Ratio Oxygen Sensor (Part #22641AA450)

Specifications

Fitment & Compatibility

This sensor is a direct OEM replacement for the following Subaru vehicles:

2004-2008 Subaru Forester XT

2004-2007 Subaru STI

2006-2007 Subaru WRX

Always verify your vehicle's VIN and existing part number against #22641AA450 before ordering to confirm fitment.

Installation

This is a direct bolt-on replacement that requires no wiring harness modification. The sensor threads into the exhaust manifold or downpipe bung and plugs directly into the factory wiring connector. Most experienced DIYers can complete the swap with an oxygen sensor socket and basic hand tools. Subaru recommends applying anti-seize compound to the sensor threads if not pre-applied. For best results, install on a cold exhaust. Professional installation is recommended if the old sensor is seized due to heat corrosion.