Subaru Impreza & Forester 1999-2004 Oxygen Sensor 22690-AA640, Direct Replacement

This replacement part uses an OEM-consistent zirconia sensing element and heat-resistant stainless steel housing, with signal response accuracy and heat shock resistance fully matching OEM standards, tested lifespan 80,000-100,000 km. OEM number 22690-AA640, directly fits Subaru Impreza WRX/Solara? 1999-2004 2.0L/2.5L engines. Functionally monitors exhaust oxygen in real time, feeds correction signal to ECU to ensure combustion efficiency and emissions compliance. Replacement is a direct plug-in; unscrew the old part, plug in the connector, no welding or programming required. A skilled mechanic can complete in about 10 minutes.