Bosch 16541 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Bosch Actual OE Oxygen Sensor 16541

Bosch 16541 is a narrow-band heated oxygen sensor built for specific downstream applications on select Porsche and Volvo models. It delivers air-fuel-ratio feedback to the ECU for stable closed-loop control, accurate lambda monitoring, and emissions management across changing operating conditions.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated sensor design for faster light-off and quicker closed-loop operation
• Specific fit with threaded mounting and 18 mm thread size
• 4-wire configuration with rectangular male connector and blade terminals
• Wiring harness included; harness length 25.8 in and overall length 29.1 in
• Steel finish with metal housing for high-temperature and vibration resistance
• Hex size: 22 mm

OE-Style Sensor Performance

Bosch’s Actual OE Oxygen Sensor line draws on decades of original equipment development, including the company’s early thimble sensor work and later planar narrowband designs. This Bosch 16541 sensor uses advanced ceramic elements and controlled heater operation to improve response time and maintain accurate signal output under demanding exhaust temperatures. It is a direct replacement choice for downstream oxygen sensor service on the Porsche 911 and Volvo S80 or XC90 applications listed below.

This part cross-references Volvo OE numbers 8670131 and 30637520 for the same application.

Compatible With These Vehicles

• Fits 2002-2005 Porsche 911, Downstream
• Fits 2003-2005 Volvo S80, Downstream Left
• Fits 2003-2005 Volvo XC90, Downstream
• Fits 2002 Volvo S80, Downstream Right
• Fits 2002 Volvo S80, Downstream Right, To 07/2002

What This Sensor Helps Address

• Fault codes related to oxygen sensor signal performance
• Rough or unstable closed-loop fuel control
• Elevated emissions from inaccurate exhaust oxygen readings
• Delayed sensor response after warm-up
• Downstream sensor replacement on Porsche 911 and Volvo S80/XC90 applications

Installation Notes

Verify the connector shape, wire count, thread diameter, and downstream position before installation. Use the vehicle’s exact application data to confirm whether the sensor is for the left or right side on the Volvo S80, and check the 07/2002 cutoff note for the 2002 S80 downstream right application. Inspect the exhaust bung threads and harness routing before tightening the sensor to the specified 18 mm thread size.

Quality Assurance

Bosch supplies this Actual OE Oxygen Sensor line with OE-proven engineering and materials developed for long service life in harsh thermal and vibration conditions. Bosch 16541 reflects that OE-focused design approach for accurate signal control in the listed Porsche and Volvo applications.