O2 Oxygen Sensor Oxygen Sensor Up+Downstream Oxygen Sensor For Subaru For Impreza For Legacy For Forester 2.0L 2005-2015 22690AA891 22641AA480 22690-AA891 22641-AA480(Upstream Downstream)

The function of the oxygen sensor is to detect the amount of oxygen contained in the exhaust gas discharged from the cylinder. For Subaru For Impreza For Legacy For Forester 2.0L 2005-2006 2007 2008 2009 2010 2011 2012 2013 2014 2015. Replacing the oxygen sensor can better fine-tune the air-fuel ratio and improve fuel economy. This oxygen sensor has fast response speed, high sensitivity, stable performance and durability. The on-board computer controls the intake of air and fuel according to the oxygen content in the exhaust gas, so that the fuel is fully burned without waste and pollutants.