Bosch 16864 Oxygen Sensor - Downstream Left

Bosch Actual OE Oxygen Sensor for BMW

Bosch 16864 is a specific-fit, narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It is a direct replacement for select BMW applications, including downstream left positions on the X5 and 760Li, with OE-style connector and threaded mounting.

Key Features

• Specific-fit Bosch Actual OE Oxygen Sensor
• Narrow-band heated sensor for stable closed-loop control
• 4-wire design with female round connector and pin terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included for direct replacement use
• Steel-finish metal housing for high-temperature service
• Part number 16864 for easy identification

Product Details

Bosch 16864 uses a switching-type narrow-band design to report exhaust oxygen content to the engine control unit, helping maintain accurate fuel delivery and emissions control. Bosch developed this sensor line from its OE oxygen sensor engineering history, including faster light-off and improved lambda response through advanced ceramic elements and heater control. For BMW owners searching for a downstream left oxygen sensor for 2007-2010 BMW X5 or 2007-2008 BMW 760Li, Bosch 16864 provides an OE-style replacement built to match the original application.

This part cross-references Bosch 16864 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Slow closed-loop fuel control response
• Emissions test failures tied to sensor degradation
• Rough combustion control caused by aging sensor output

Installation Notes and Tips

Fits 2007-2010 BMW X5, downstream left. Fits 2007-2008 BMW 760Li, downstream left. Confirm the connector shape, wire count, and threaded sensor location before installation. Use the correct oxygen sensor socket for the 22 mm hex and verify the 18 mm thread size matches the original sensor location. Because this is a heated narrow-band sensor with a specific-fit harness, route the wiring to match the factory path and avoid heat or abrasion contact.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development in oxygen sensing technology. The design reflects Bosch’s original OE sensor engineering and its later planar narrowband advancements, with materials selected for thermal and vibration resistance in demanding exhaust environments.