Bosch 16323 Oxygen Sensor - Downstream

Bosch Actual OE Oxygen Sensor 16323

Bosch 16323 is a specific-fit, narrow-band heated oxygen sensor for downstream applications on select Porsche models. It provides air-fuel-ratio feedback to the ECU for stable closed-loop control and emissions monitoring.

Key Features

• Actual OE Oxygen Sensor from Bosch Actual OE Oxygen Sensor line
• Specific fit for downstream placement
• Narrow-band heated O2 sensor for precise switching-type signal output
• 4-wire design with included wiring harness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Female connector with oblong shape and pin terminals
• High-temperature metal housing for demanding exhaust conditions

OE-Style Sensor Design

Bosch 16323 uses a switching-type narrow-band design to report exhaust oxygen content to the engine control unit. Bosch has decades of OE oxygen sensor development behind this platform, including early thimble-style sensors and later planar narrowband designs that improved response time, lambda accuracy, and closed-loop operation. This part number is built for consistent signal delivery under heat and vibration, making it a direct replacement choice for downstream monitoring on Porsche Boxster and Porsche Cayman applications.

This part cross-references Monroe Shocks & Struts (e.g., 9A160619302) for the same application.

Vehicle Fitment

• Fits 2013-2016 Porsche Boxster, Downstream
• Fits 2014-2016 Porsche Cayman, Downstream

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Slow sensor response during closed-loop operation
• Emissions test failures tied to oxygen sensor faults
• Rough combustion control caused by a worn narrow-band sensor

Installation Notes

Verify downstream location before ordering and match the connector, thread size, and harness length to the original sensor. Use the threaded mounting point and proper oxygen sensor socket during removal and installation. Inspect the exhaust bung threads and wiring routing before final tightening to avoid connector strain or exhaust leaks.

Quality Assurance

Bosch supplies this oxygen sensor as an OE-proven replacement built to the same standards associated with its long-running oxygen sensor development for vehicle manufacturers.