This genuine OEM Bosch oxygen sensor is a perfect fit for your 2001 Infiniti QX4 3.5L. It is designed to work with upstream technology and is compatible with various part numbers including 13531, 24619, OS5192, ES10959, F00E260899, 22690 4W010, and 22690 4W012. The sensor is made by Bosch, a trusted brand in the automotive industry, and is sold as a single piece. This oxygen sensor is an essential component for your car's exhaust and emission system. It is easy to install and will provide accurate readings to ensure that your engine runs smoothly. Don't miss out on this high-quality Bosch oxygen sensor for your Infiniti QX4 3.5L.