Ford Mondeo 2.0L/2.5L Rear Oxygen Sensor 1S7F-9G444-BA 2001-2007 Model

This replacement uses an OEM-grade zirconia sensing element and high-temperature stainless steel housing; material and welding processes have been bench-tested to match OEM lifespan. OEM number 1S7F-9G444-BA; fits Ford Mondeo 2.0L and 2.5L engines, covering 2001-2007 models. Function: monitors exhaust oxygen content and feeds signals to the ECU to adjust the air-fuel ratio, ensuring combustion efficiency and emissions compliance. Direct replacement: unscrew the old sensor and plug in the new; note that high-temperature exhaust may cause rusted threads; perform with cold engine and have a dedicated socket ready.