Bosch 16173 Oxygen Sensor - Downstream

Bosch 16173 Oxygen Sensor for Saab 9-5

Bosch 16173 is an Actual OE Oxygen Sensor built as a narrow-band heated replacement for precise air-fuel ratio feedback. It is a specific-fit sensor for downstream service on Saab 9-5 models, with OE-style connector, threaded mounting, and an included wiring harness for direct replacement work.

Key Features

• Specific-fit Bosch Actual OE Oxygen Sensor for downstream applications
• Narrow-band heated design for stable closed-loop fuel control
• 4-wire configuration with blade terminals and rectangular male connector
• Threaded 18 mm mounting with 22 mm hex size
• Wiring harness included; harness length measures 55.7 in
• Metal housing with high-temperature-resistant construction
• Part number 16173 for catalog and service reference

OE-Style Sensor Design

Bosch’s Actual OE Oxygen Sensor line draws on decades of original equipment development, including early narrowband sensor designs and later planar technology improvements focused on faster light-off and quicker closed-loop response. Bosch 16173 uses a heated narrow-band sensing element to deliver consistent exhaust feedback to the ECU, helping maintain stable combustion control under changing load and temperature conditions. This part number 16173 is a direct replacement choice for Saab 9-5 downstream service where OE-style fit and signal behavior matter.

This part cross-references 4571477 for the same application.

Fitment

• Fits 2001-2003 Saab 9-5, downstream.
• Fits 2000 Saab 9-5, downstream, from chassis # Y3040001.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Slow or inaccurate oxygen sensor signal response
• Rough fuel control caused by aging narrow-band sensor output
• Emissions test failures tied to sensor performance
• Connector or harness wear on the original Saab 9-5 sensor

Installation Notes

Verify downstream location before installation and confirm the 18 mm thread size, 22 mm hex, and 4-wire connector layout match the original sensor. Inspect the exhaust bung threads and connector condition before tightening the threaded sensor into place. For 2000 Saab 9-5 applications, confirm the chassis break at Y3040001 before ordering or installing Bosch 16173.

Quality Assurance

Bosch supplies this Actual OE Oxygen Sensor using OE-proven engineering and durable materials selected for heat and vibration exposure in exhaust service. The Bosch 16173 is built to support consistent sensor output in demanding operating conditions and to match the fitment requirements listed for Saab 9-5 downstream replacement.