Subaru Forester Oxygen Sensor 22690-AA891, Dual OE Number Compatible 22690-AA831

This oxygen sensor is designed for the 2009-2013 Subaru Forester 2.5L Naturally Aspirated engines, and also compatible with 2010-2014 Subaru Outback 2.5L and 2012-2016 Subaru XV 2.0L models. Its core function is real-time monitoring of oxygen content in the exhaust and feeding back to the ECU to adjust the air-fuel ratio, ensuring engine combustion efficiency and emissions compliance. OEM number 22690-AA891, with dual OE compatibility 22690-AA831 for cross-checking with original parts. Replacement difficulty: medium. Use a dedicated oxygen sensor socket for removal; avoid damaging threads or wiring. After installation, clear fault codes and perform road testing. This sensor is a direct replacement design and does not require programming, but it is recommended to also check spark plugs and air filter condition to optimize performance.