High Precision and Compatibility: Designed specifically for BMW models E60, E61, E63, E64, E65, E66, and E67, these JESBEN Lambda Probe O2 Oxygen Sensors ensure accurate measurements of exhaust gases. The sensors are engineered to seamlessly integrate with 540i, 550i, 650i, 740i, 750i, 740li, and 750li models Advanced Sensor Technology: Featuring the innovative Differential Holzer sensor type, these oxygen sensors offer superior sensitivity and faster response times. With a sensitivity specification of 0258010421 and 0258006794, they detect oxygen levels with high precision, enhancing the efficiency and performance of your vehicle's engine. Durable and Reliable: Each sensor is constructed with high-quality materials to withstand harsh engine environments. The sensors come with a 1-year warranty, ensuring reliability and performance. The total lengths of the sensors are tailored to specific needs: 450mm, 325mm, 620mm, and 680mm for various installation requirements. Optimized Engine Performance: By accurately measuring oxygen levels, these sensors help maintain the balance between air and fuel within your engine. This not only improves fuel efficiency but also helps in reducing harmful emissions, supporting overall environmental friendliness and compliance with emission standards. Easy Installation and No Chemical Concerns: These sensors are designed for easy installation, allowing for a quick replacement without the need for professional help. They are free from high-concern chemicals, making them a safe choice for you and the environment. Description/Features: Ensure compatibility by verifying the part number and viewing the item image before purchasing. This product is designed for specific BMW models and engine types to guarantee a perfect fit and optimal performance. Specifications: - BMW 5 (E60) 540i N62 B40 A: 4000CC, 225KW,8 Cylinders, Saloon, 2005-2010 - BMW 5 (E60) 550i N62 B48 B: 4799CC, 270KW, 8 Cylinders, Saloon, 2005-2010 - BMW 5 Touring (E61) 550i N