Subaru Oxygen Sensor 22690-AA520 22690-AA70A 22690-AA45C Multi-Model Compatible

If your Subaru has check engine light on, fuel economy rising, acceleration weak, or idle unstable, the oxygen sensor aging or failure is usually the cause. This part monitors exhaust oxygen and feeds ECU to precisely control air-fuel ratio for efficient combustion and lower emissions. Compatible with OEM numbers 22690-AA520, 22690-AA70A, 22690-AA45C and AA491; fits Subaru Forester, Outback, Liberty and other models. Before installation ensure engine is cold; disconnect battery negative; carefully remove old sensor with a special socket to avoid damaging threads or wiring.