Ford Fiesta Oxygen Sensor 12575657 Air-Fuel Ratio Sensor OEM Equivalent Replacement Part

When your Ford Fiesta exhibits rough idle, slow acceleration, abnormal fuel consumption or engine fault light on, it usually indicates aging or failure of the oxygen sensor (air-fuel ratio sensor). This sensor monitors exhaust oxygen content in real time and sends signals to ECU to precisely control air-fuel ratio for efficient combustion and reduced emissions. This product is an OEM-equivalent replacement, OEM 12575657, suitable for Fiesta and other models. Use a dedicated socket for removal to avoid thread damage; ensure sensor wiring does not contact hot exhaust to prevent melting.