Ford Fiesta Rear Oxygen Sensor AE81-9G444-BCA/OZA658-D3, Direct Replacement

Ford Fiesta 2009–2015 1.5L and 1.6L engines rear oxygen sensor, OEM AE81-9G444, also compatible with OZA658-D3; direct replacement with no wiring changes. This sensor monitors oxygen in exhaust and sends data to the ECU to precisely regulate fuel injection, ensuring optimal combustion efficiency. When fuel consumption is high, acceleration is weak, check engine light is on, idle is unstable, or there is exhaust smell, the oxygen sensor aging disrupts the mixture; replace to resolve.