Focus Front Oxygen Sensor 3M51-9G444-AB 0258006569 Universal Direct Replacement

This front oxygen sensor directly replaces original part number 3M51-9G444; models 3M51-9G444-AB and 0258006569 are universal; no rewiring or ECU flashing needed, drop-in. Function: monitor oxygen content in exhaust and feed ECU to adjust fuel injection for combustion efficiency. Compatible with Ford Focus 1.8L and 2.0L, especially 2005–2012. Installing resolves high fuel consumption, weak acceleration, and excessive emissions; engine check light will go off. If idle is unstable, cold start is difficult, or O2 sensor fault codes appear, this part is aging and should be replaced.