One Year Unlimited Mileage Quality Guarantee Fits BMW 128I 2008-2013 3.0L; Fits BMW 325i 2006 3.0L; Fits BMW 328i xDrive 2009-2013 3.0L; Fits BMW 328Xi 2007-2008 3.0L; Fits BMW 330i 2006 3.0L; Fits BMW 335i xDrive 2009-2011 3.0L; Fits BMW 335iS 2011-2013 3.0L; Fits BMW 528i xDrive 2009-2010 3.0L; Fits BMW X3 2007-2010 3.0L; Fits BMW X5 2007-2010 3.0L; Fits BMW Z4 2006-2014 3.0L Installation: 2pcs Downstream Before buying, check the “Select Your Vehicle” check (brand, model, year, engine, Note,The engine and Note in particular) at the top of the link to see if your car can be used. The Sangyue Oxygen Sensor is designed for a variety of BMW models including the 128I, 325i, 328i xDrive, 328Xi, 330i, 335i xDrive, 335iS, 528i xDrive, X3, X5, and Z4, all with a 3.0L engine. This product comes with a one-year unlimited mileage quality guarantee for your peace of mind. The installation process involves 2pcs downstream sensors. Please ensure that you check the compatibility of your vehicle by using the 'Select Your Vehicle' check at the top of the product link, taking into account the brand, model, year, engine, and any notes, particularly the engine and note. This product is made of high-quality materials such as stainless steel and aluminum oxide, with a flange mount and a modern style. It is an oxygen sensor with a temperature rating of up to 1832 degrees Fahrenheit. The package includes 2 downstream oxygen sensors.