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.Features:Pretested, precise and high quality oxygen sensor.Designed to improve fuel economy while reducing harmful emissions.Helps the engine run efficiently in perfect air-gas ratio.Improve engine response and performance.Direct replacement for the original one. Easy installation.Fit for 323i 325i X3 X5 E39 E46.Specification:Condition: 100% Brand NewMaterial: Metal + PlasticColor: as picture showReference Part Number: 1781433050, 11781433075, 11781433940, 11781742050, 234-4672, 234-4683, 2344672, 2344683, SG1108, ES10899, ES10857, 15109, 13477, 250-24611, 250-24392, 0258005109, 025800347 Size: as picture showsPackage Weight: approx.564g/20ozFitment: for323CI2000E 46M 52L6-2.5LUpstream and Downstreamfor323I1999-2000E 46M 52L6-2.5LUpstream and Downstreamfor325CI2001-2003/03E 46M 54L6-2.5LUpstream and Downstreamfor325I2001-2003/03E 46M 54L6-2.5LUpstream and Downstreamfor325XI2001-2005E 46M 54L6-2.5LUpstream and Downstreamfor328CI2000E 46M 52L6-2.8LUpstream and Downstreamfor328I1999-2000E 46M 52L6-2.8LUpstream and Downstreamfor330CI2001-2003/03E 46M 54L6-3.0LUpstream and Downstreamfor330I2001-2003/03E 46M 54L6-3.0LUpstream and Downstreamfor330XI2001-2005E 46M 54L6-3.0LUpstream and Downstreamfor525I2001-2003/03E 39M 54L6-2.5LUpstream and Downstreamfor528I1999-2000E 39M 52L6-2.8LUpstream and Downstreamfor530I2001-2003/03E 39M 54L6-3.0LUpstream and DownstreamforX3(M/T)2004-2005 E 83M 54L6-2.5LUpstream and DownstreamforX3(M/T)2004-2006E 83M 54L6-3.0LUpstream and DownstreamforX52001-2006E 53M 54L6-3.0LUpstream and DownstreamforZ31999-2000E 36M 52L6-2.8LUpstream and DownstreamforZ32001-2002E 36M 54L6-3.0LUpstream and DownstreamforZ42003-2005E 85M 54L6-2.5LUpstream and DownstreamforZ42003-2005E 85M 54L6-3.0LUpstream and DownstreamPackage List:4 * Oxygen Sensor