Subaru Rear Air-Fuel Ratio Oxygen Sensor 22690-AA990/22690-AA960 Universal Replacement Solution

This rear air-fuel ratio oxygen sensor is for 2005-2012 Subaru Legacy, Outback, Forester and Impreza 2.5L/2.0L; perfectly replaces OEM numbers 22690-AA990 and 22690-AA960; ensures precise matching with ECU system. It monitors oxygen content in exhaust and feeds back to ECU to optimize air-fuel ratio, reduce fuel consumption and emissions. Replacement using a professional oxygen sensor socket is recommended; avoid pulling the harness; installation torque about 40-50 Nm. As a general replacement, KLP brand offers electrical performance identical to OEM for bulk procurement to reduce replacement costs.