Features: 1.Pretested, precise and high quality oxygen sensor. 2.Designed to improve fuel economy while reducing harmful emissions. 3.Helps the engine run efficiently in perfect air-gas ratio. 4.Improve engine response and performance. 5.Fit for 323i 325i X3 X5 E39 E46. Specification: Oxygen sensor is an electronic device that measures the proportion of oxygen in the gas or liquid being analyzed. It is positioned in the exhaust pipe and can detect the ratio of air and gasoline._x005F_x000D_ _x005F_x000D_ Features:_x005F_x000D_ _x005F_x000D_ Pretested, precise and high quality oxygen sensor. _x005F_x000D_ Designed to improve fuel economy while reducing harmful emissions. _x005F_x000D_ Helps the engine run efficiently in perfect air-gas ratio. _x005F_x000D_ Improve engine response and performance. _x005F_x000D_ Direct replacement for the original one. Easy installation. _x005F_x000D_ Fit for 323i 325i X3 X5 E39 E46. _x005F_x000D_ _x005F_x000D_ Specification:_x005F_x000D_ Condition: 100% Brand New_x005F_x000D_ Material: Metal + Plastic_x005F_x000D_ Color: as picture show_x005F_x000D_ Reference Part Number: 1781433050, 11781433075, 11781433940, 11781742050, 234-4672, 234-4683, 2344672, 2344683, SG1108, ES10899, ES10857, 15109, 13477, 250-24611, 250-24392, 0258005109, 025800347 _x005F_x000D_ Size: as picture shows_x005F_x000D_ Package Weight: approx.564g/20oz_x005F_x000D_ _x005F_x000D_ Fitment: _x005F_x000D_ for 323CI 2000 E 46 M 52 L6-2.5L Upstream and Downstream _x005F_x000D_ for 323I 1999-2000 E 46 M 52 L6-2.5L Upstream and Downstream_x005F_x000D_ for 325CI 2001-2003/03 E 46 M 54 L6-2.5L Upstream and Downstream_x005F_x000D_ for 325I 2001-2003/03 E 46 M 54 L6-2.5L Upstream and Downstream_x005F_x000D_ for 325XI 2001-2005 E 46 M 54 L6-2.5L Upstream and Downstream_x005F_x000D_ for 328CI 2000 E 46 M 52 L6-2.8L Upstream and Downstream_x005F_x000D_ for 328I 1999-2000 E 46 M 52 L6-2.8L Upstream and Downstream_x005F_x000D_ for 330CI 2001-2003/03 E 46 M 54 L6-3.0L Upstream and Downstream_x005F_x000D_ for 330I 2001-2003/03 E 46 M 54 L6-3.0L Upstream and Downstream_x005F_x000D_ for 330XI 2001-2005 E 46 M 54 L6-3.0L Upstream and Downstream_x005F_x000D_ for 525I 2001-2003/03 E 39 M 54 L6-2.5L Upstream and Downstream_x005F_x000D_ for 528I 1999-2000 E 39 M 52 L6-2.8L Upstream and Downstream_x005F_x000D_ for 530I 2001-2003/03 E 39 M 54 L6-3.0L Upstream and Downstream_x005F_x000D_ for X3(M/T) 2004-2005 E 83 M 54 L6-2.5L Upstream and Downstream_x005F_x000D_ for X3(M/T) 2004-2006 E 83 M 54 L6-3.0L Upstream and Downstream_x005F_x000D_ for X5 2001-2006 E 53 M 54 L6-3.0L Upstream and Downstream_x005F_x000D_ for Z3 1999-2000 E 36 M 52 L6-2.8L Upstream and Downstream_x005F_x000D_ for Z3 2001-2002 E 36 M 54 L6-3.0L Upstream and Downstream_x005F_x000D_ for Z4 2003-2005 E 85 M 54 L6-2.5L Upstream and Downstream_x005F_x000D_ for Z4 2003-2005 E 85 M 54 L6-3.0L Upstream and Downstream_x005F_x000D_ _x005F_x000D_ Package List:_x005F_x000D_ 4 * Oxygen Sensor PackageList: