Mazda 3 L4-2.0L 2004-2005 Downstream. Mazda 3 L4-2.3L 2004-2005 Downstream. Mazda 5 L4-2.3L 2006-2007 Downstream. Oxygen Sensor. Year Range. 100% Factory tested. Ensures smog test compliance. Superior design maximizes engine performance and fuel efficiency while reducing fuel consumption and harmful emissions.
