【Fitment-1】Only for Cylinder 4/5/6! The automotive oxygen sensor compatible with BMW 1 Series 128i 3.0L (2008-2013), 135i 3.0L (2008-2010); 3 Series 323i 2.5L (2007-2011), 328i 3.0L (2007-2013), 328i xDrive 3.0L (2009-2013), 335i 3.0L (2007-2010), 335is 3.0L (2011-2013), 335i xDrive 3.0L (2009-2010), 335xi 3.0L (2007-2008)
【Fitment-2】Only for Cylinder 4/5/6! The upstream and downstream oxygen sensor compatible with 5 Series 525i 3.0L (2007), 525xi 3.0L (2007), 528i 3.0L (2008-2010), 528i xDrive 3.0L (2009-2010), 528xi 3.0L (2008), 530i 3.0L (2007), 530xi 3.0L (2007); X Series X3 3.0L (2007-2009), X5 3.0L (2007-2008), X5 3.0L for Gas Engine (2009-2010); Z Series Z4 3.0L (2006-2015)
【Reference Part Number】O2 sensor upstream: 234-5138, 17025, 0258017025, 11787540167, 754016702; O2 sensor downstream: 234-4892, 2344892, 213-3039, 16789, 16792, 75-4121, ES20173, 25613, 16796, 16809, 75-3754, 75-3760. Please check your part matches our images and OE number
【Premium Quality】Made of premium material, long service life and reliable performance, this o2 oxygen sensor features a long-lasting stainless steel and high-temperature zirconia ceramic element
【Main Function】This oxygen sensor detects the air-fuel mixture. It sends this data to the vehicle's ECU to assist in maintaining the air-fuel ratio