Upgrade your BMW X5, X6, or other compatible vehicles with our premium 4-pack Higherbro Oxygen Sensors. These sensors are designed to fit a wide range of BMW models from 2009 to 2017, including 550I, 650i, 750i, and Alpina B6/B7 series, ensuring optimal performance for your specific vehicle. Each pack includes 2 Upstream and 2 Downstream sensors, providing comprehensive coverage for your engine's oxygen sensing needs. Manufactured with high-quality materials like Stainless Steel, Ceramic, and Precious Metals, these sensors are built to withstand temperatures up to 1800F (982C) and deliver accurate readings within a measuring range of 0 - 25%. Enjoy peace of mind with a one-year quality guarantee. Before purchasing, ensure compatibility by checking the 'Select Your Vehicle' feature on the product page.