Subaru Impreza Oxygen Sensor 22690-AA900 Gasoline Version Front and Rear Compatible

Subaru WRX (gasoline version) oxygen sensor (number 22690-AA900) installed on the exhaust manifold or pipe, monitors exhaust oxygen content in real time and feeds ECU to precisely control the air-fuel ratio for efficient combustion. This front-rear universal sensor fits many WRX petrol models; installation difficulty is medium, about 30–60 minutes; avoid thread damage. If the vehicle shows idle instability, loss of power on acceleration, increased fuel consumption, or a fault light, this usually indicates aging or failure of the oxygen sensor and replacement is needed promptly.