Though small in size, an oxygen sensor has a very important function. It is one of the most critical components responsible for improving fuel efficiency and lowering harmful exhaust emissions. Based on 100 percent OE design, Magneti Marelli Oxygen Sensors provide best-in-class performance and maximum service life. They are made with a combination of Zirconium and Yttrium oxides and other elements to form a tough base that can withstand the intense conditions they are often subjected to.