Bosch 13373 Oxygen Sensor - Upstream

Bosch Actual OE Oxygen Sensor 13373

Bosch 13373 is a narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management for the 1994 Volvo 850 upstream application listed below.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated O2 sensor for closed-loop fuel control
• Specific fit with threaded mounting
• 4-wire design with blade terminals and rectangular connector
• Wiring harness included; harness length 17.2 in
• Metal housing with steel finish for high-temperature service
• 22 mm hex size and 18 mm thread diameter
• Overall length 20.9 in; sealing surface to connector end 19.7 in

Product Details

Bosch Actual OE Oxygen Sensor line is based on decades of original equipment development, including early thimble-style sensors and later planar narrowband designs that improved light-off speed, lambda accuracy, and closed-loop response. Bosch 13373 uses advanced ceramic elements, controlled heater operation, and heat-resistant materials to maintain consistent signal output under thermal cycling and vibration. This part cross-references Monroe Shocks & Struts (e.g., 9135664) for the same application. Compatible With 1994 Volvo 850, upstream. Bosch 13373 is the correct style for buyers searching for a 1994 Volvo 850 upstream oxygen sensor, Bosch 13373 Volvo 850 O2 sensor, or a specific-fit narrow-band heated sensor for OE-style replacement.

What It Helps Address

• Rich or lean air-fuel readings that trigger drivability concerns
• Slow oxygen sensor response during closed-loop operation
• Emissions-related fault codes tied to upstream sensor performance
• Unstable idle or fuel trim correction caused by inaccurate O2 feedback
• Sensor degradation from heat and vibration exposure

Installation Notes

Install in the threaded upstream location specified for the 1994 Volvo 850, without Air Pump, from chassis #70019. Verify connector shape, wire count, thread diameter, and harness routing before installation. Use the listed 22 mm hex size for removal and installation, and confirm the sealing surface and connector reach match the vehicle layout.

Quality Assurance

Bosch supplies this oxygen sensor as an OE-proven replacement backed by more than five decades of oxygen-sensor development and aftermarket support. The Bosch 13373 is built to the same engineering standards used for original equipment applications.