Ford Focus Oxygen Sensor 3M51-9G444-CB 0258006571 No modification needed, direct installation

Ford Focus with 1.6L or 2.0L engines: replace oxygen sensor with OEM number 3M51-9G444-CB (0258006571). This sensor features a high-temperature stainless steel housing and ceramic sensing element, strictly adhering to OEM standards to withstand high-temperature exhaust. It monitors exhaust oxygen content in real time and feeds signals to the ECU to adjust the air-fuel ratio, ensuring combustion efficiency and preventing fuel economy loss or emissions exceedance. Installation requires no wiring or bracket modification; thread into the exhaust pipe interface. A typical repair bay can complete replacement within 30 minutes.