Subaru 22641AA71A Oxygen Sensor Assembly

Technical specifications for Subaru OEM oxygen sensor part number 22641AA71A. This upstream air fuel ratio sensor monitors exhaust oxygen content and transmits data to the engine control unit for optimal air-fuel mixture and emissions control. Designed for direct fit installation on specified Subaru models with 2.5L FB25 boxer engines. Features 4-wire heated wideband sensor element with metal housing and protective shield. Operating temperature range up to 900°C. Thread size M18x1.5. Connector type mini-blade 4-pin. Replaces Denso 439000-6110 and aftermarket cross-references 234-9138, 22641AA670. Material composition includes zirconia ceramic sensing element, stainless steel housing, high-temperature wiring harness with protective loom. Manufactured to Subaru OEM specifications for durability and precise lambda measurement. Compatible with OBD-II diagnostics systems.