Subaru Legacy Outback Rear Oxygen Sensor 22690-AA930, Compatible with 22690-AA910

Subaru Forester and Outback rear oxygen sensor, replacing OEM 22690-AA930 and compatible with 22690-AA910. Monitors exhaust oxygen content and feeds ECU to adjust air–fuel ratio for combustion efficiency. Replacing this sensor resolves high fuel consumption, excessive emissions, or engine warning lights. If acceleration is weak, idle is unstable, or the exhaust emits black smoke, sensor aging is suggested for replacement.