Ford Oxygen Sensor 234-5038 BL3A-9Y460-CA Air-Fuel Ratio Sensor Replacement

Ford Fusion, Escape, Focus, etc. oxygen sensor OEM 234-5038 / BL3A-9Y460-CA / BL3Z-9F472-A; air-fuel ratio sensor directly replaces original. Mounted on exhaust manifold or pipe; monitors exhaust oxygen and provides feedback to ECU to adjust fuel delivery for optimal air-fuel ratio. Installation difficulty: medium; labor about 0.5-1 hour. If check engine light on, idle rough, fuel consumption up, or weak acceleration, sensor replacement is indicated.