Bosch 16328 Oxygen Sensor - Downstream or Downstream Left

Bosch Actual OE Oxygen Sensor 16328

Bosch 16328 is a specific-fit, narrow-band heated oxygen sensor built for downstream monitoring on select Mercedes-Benz applications. It measures air-fuel ratio data for the ECU to support stable combustion control and lower emissions, with OE-style response characteristics for consistent closed-loop operation.

The Bosch Actual OE Oxygen Sensor line reflects Bosch’s long history in oxygen sensor development, including early thimble-style designs and later planar narrowband technology. This product line focuses on fast light-off, accurate lambda feedback, and durable operation under heat and vibration, making it a practical OE replacement for vehicles that require precise exhaust feedback.

• Specific-fit Bosch oxygen sensor for direct application matching
• Narrow-band heated design for faster sensor activity and closed-loop control
• 4-wire configuration with round female connector and pin terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included for proper connection length and routing
• Metal housing and high-temperature-resistant construction for exhaust service
• Cross-reference part numbers: 0015407617, 0025405617

Detailed Product Information

This Bosch oxygen sensor, part number 16328, is engineered as an OE-style replacement for downstream exhaust monitoring on Mercedes-Benz models including the SLR McLaren, SL55 AMG, ML500, R500, CLS500, CLS55 AMG, E500, E55 AMG, SL500, and E320. It is a narrow-band heated oxygen sensor that sends precise exhaust oxygen feedback to the ECU, helping maintain the correct air-fuel ratio during normal driving and under changing load conditions. The Bosch Actual OE Oxygen Sensor 16328 is built for direct-fit service where accurate sensor response and stable signal output matter.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Slow downstream sensor response
• Emissions test failures tied to sensor degradation
• Rough combustion control caused by inaccurate exhaust readings

Installation Notes and Tips

Verify the connector shape, wire count, thread size, and sensor position before installation. This unit uses a threaded 18 mm mounting design with a 22 mm hex and a 4-wire harness, so matching the original sensor layout is important for proper routing and connection. For best results, inspect the exhaust bung threads and connector condition before installing the new sensor.

Fits 2005-2009 Mercedes-Benz SLR McLaren, downstream; fits 2003-2008 Mercedes-Benz SL55 AMG, downstream; fits 2006-2007 Mercedes-Benz ML500, downstream left; fits 2006-2007 Mercedes-Benz R500, downstream left; fits 2006 Mercedes-Benz CLS500, downstream; fits 2006 Mercedes-Benz CLS55 AMG, downstream; fits 2003-2006 Mercedes-Benz E500, downstream; fits 2003-2006 Mercedes-Benz E55 AMG, downstream; fits 2003-2006 Mercedes-Benz SL500, downstream; fits 2003-2005 Mercedes-Benz E320, downstream.

Quality Assurance

Bosch backs this oxygen sensor with OE development experience and aftermarket supply built around the same engineering standards used by vehicle manufacturers. Part number 16328 is produced for consistent signal accuracy, thermal durability, and dependable service in demanding exhaust environments.