Walker 350-33033 Oxygen Sensor - Upstream

Walker 350-33033 Oxygen Sensor for Volvo 940

Walker Products 350-33033 is a heated oxygen sensor built as a specific-fit replacement for select Volvo applications. It is engineered for the upstream position and is designed to provide the ECU with the feedback needed for proper fuel control and emissions monitoring.

Key Features

• Specific-fit oxygen sensor for targeted vehicle applications
• Heated sensor design for faster operating temperature
• 3-wire configuration with 20-gauge wiring
• Radiused polygon male connector for application-specific fitment
• Threaded mounting with 18.0 mm thread diameter
• Overall length: 36.93 in.; wiring harness length: 33.39 in.

Application Details

This Walker Products Aftermarket oxygen sensor, part number 350-33033, is listed for 1994-1995 Volvo 940 upstream positions, including Bank 1 Sensor 1 applications. It is also listed for front oxygen sensor use on various Volvo 940 configurations. Walker Products develops engine management and oxygen/air-fuel sensors as OE replacement parts, with application-specific fitment and diagnostic feedback matched to the vehicle ECU. The Walker Products Aftermarket line focuses on replacement sensors for modern engine management systems, including heated oxygen sensors used to monitor exhaust content and support fuel trim control.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough running caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust readings
• Higher exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the sensor circuit or related systems

Installation Notes

Verify the connector shape, wire count, thread diameter, and mounting position before installation. Inspect the sensor wiring harness and connector for damage, since physical wear can shorten service life and affect signal quality. Confirm the upstream location on the vehicle and compare the old sensor to the replacement before fitting.

Quality Assurance

Walker Products states that its engine management sensors are manufactured for specific applications and fitment positions, with feedback characteristics matched to ECU requirements. The company is ISO 9001/TS 16949 certified and has supplied engine management and fuel system components since 1946.