Oxygen Sensor Downstream Air Fuel Ratio for Subaru Forester WRX Tribeca 2.5L

Upgrade your Subaru’s exhaust sensing with the IWOKPHD Oxygen Sensor Downstream Air Fuel Ratio designed for Forester, WRX, and Tribeca 2.5L engines. This downstream O2 sensor monitors the exhaust gas after the catalytic converter, providing precise feedback on the air-fuel ratio (Lambda) to the ECU. By keeping the mixture balanced, you’ll enjoy improved fuel efficiency, lower emissions, and better catalytic converter protection from rich or lean conditions.

Compatible across key 2.5L Subaru platforms, it fits Forester 2008–2013 4Cyl 2.5L DOHC models and Impreza variants from 2008–2014, including EMPI TURBO 25GT/25GT-S, WRX, WRX-S, and STI configurations. The part uses OEM reference 22690-AA900 with multiple cross references, ensuring a reliable interchange and a precise drop-in replacement.

Originating from Mainland China, each unit is thoroughly tested to meet IWOKPHD’s quality standards. The sensor is designed for stable installation and a dependable signal that supports consistent engine performance and emissions control.

Benefits & Tips

• Maintains accurate downstream air-fuel ratio readings to support optimal engine performance and reduced exhaust emissions.
• Replacing a faulty downstream O2 sensor helps prevent rough idle, hesitation, and potential diagnostic trouble codes related to the air-fuel balance.
• Tip: After installation, perform a short drive cycle to help the ECU relearn fuel trims and stabilize the air-fuel management.

Product specifications

• Brand: IWOKPHD
• Part Numbers / OEM references: 22690-AA900 (primary); cross references include 24651 SU11443 LS140565 234-4446 22690-AA68A 89465-B4030 89465-B1040 89465-97410 5S9990 22690AA900 22690AA960 234-4513 22690-AA960
• Sensor type: Oxygen sensor (downstream) for air-fuel ratio (Lambda)
• Fitment: Forester 2008–2013 4Cyl 2.5L DOHC; Impreza 2008–2014 4Cyl 2.5L DOHC EMPI TURBO 25GT/25GT-S; Impreza STI 2008–2014; Impreza WRX 2008–2014
• Package includes: 1 x Oxygen Sensor
• Origin: Mainland China
• Warranty: 1 year Replacement Warranty
• Note: Please check the product picture and fitment before ordering. If you are not sure, please contact us before you order to avoid incorrect purchases.

Package includes:

• 1 x Oxygen Sensor

Warnings / Reminders

Please verify fitment before ordering. If you are not sure, contact us prior to purchase. Returns may not be granted for incorrect orders.

All electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty.

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