Subaru OEM Rear O2 Sensor Subaru Legacy GT / Outback XT 2005-2009 | 22690AA69A

Fitment Chart

• 2005–2009 Subaru Legacy GT / GT-B
• 2005–009 Subaru Outback XT

Overview

The Genuine Subaru OEM Rear Oxygen Sensor (Part #22690AA69A) is the factory-correct replacement O2 sensor for 2005–2009 Subaru Legacy GT models. Designed and manufactured to exact OEM specifications, this downstream oxygen sensor ensures your Legacy GT's engine management system operates at peak efficiency, maintaining proper air-fuel ratio monitoring and emissions compliance. If you're experiencing an O2 sensor fault code or sluggish fuel economy, replacing with the genuine Subaru part guarantees a perfect fit and reliable factory performance.

Key Features & Benefits

• Genuine Subaru OEM Quality – Manufactured to the same specifications as the original factory-installed sensor, ensuring precise signal output and long-term durability.
• Exact-Fit Guarantee – Direct plug-and-play replacement with the OEM wiring harness connector — no adapter or modification required.
• Accurate Exhaust Monitoring – Downstream (rear) placement monitors post-catalytic converter exhaust gases, enabling accurate catalyst efficiency diagnostics and preventing false CEL triggers.
• Optimal Fuel Economy & Emissions – A properly functioning rear O2 sensor supports the ECU's closed-loop fuel management, helping maintain fuel efficiency and emissions compliance.
• Factory Warranty Coverage – As a Genuine Subaru OEM part, this sensor is backed by Subaru's standard OEM parts warranty.
• Eliminates Common Fault Codes – Directly addresses P0136, P0137, P0138, P0139, P0140, and related rear O2 sensor DTCs on Legacy GT applications.

What's Included

• 1x Genuine Subaru Rear Oxygen Sensor (Part #22690AA69A)

Specifications

Installation

This rear oxygen sensor is a direct OEM replacement and is designed for straightforward installation using standard O2 sensor tools (22mm O2 sensor socket recommended). Disconnect the negative battery terminal, safely lift and support the vehicle, unplug the existing sensor connector, and unthread the old sensor. Thread in the new sensor and reconnect the harness. Clear any stored DTCs with an OBD-II scanner after installation. Professional installation is recommended if you are unfamiliar with exhaust system components or do not have access to a vehicle lift.