Subaru Outback Third Generation Rear Oxygen Sensor 22690-AA930

When your Subaru Outback third generation shows check engine light, obvious fuel consumption increase, idle instability, or weak acceleration, it is likely the rear oxygen sensor aging or failure. This sensor, when functioning, monitors oxygen content in exhaust and feeds ECU with an air–fuel ratio signal to ensure efficient combustion and reduced emissions. Fits 2010-2014 Subaru Outback (3rd generation). OEM 22690-AA930. Installation notes: use a dedicated socket to remove the old sensor to avoid thread damage; clean the mounting hole before installation; apply a small amount of anti-seize; torque must follow factory specs; over-tightening can cause breakage.