Subaru Forester Impreza Oxygen Sensor 22690-AA

This replacement uses a high-temperature ceramic core and dual protective tube structure; materials and welding processes pass vibration tests, durability nearly as original. OEM numbers 22690-AA70A and 22690-AA850, compatible with Subaru Forester, Impreza 2.0L/2.5L models. Function: monitors exhaust gas oxygen content directly and feeds back to ECU to adjust the air–fuel ratio, effectively avoiding MIL or increased fuel consumption. Replacement difficulty: medium. Use a special socket to remove the old part; avoid thread stripping. Recommend cooling the engine and applying anti-seize lubricant.