Walker 350-33065 Oxygen Sensor - Upstream

Walker Oxygen Sensor for Subaru Legacy

Walker Products 350-33065 is a heated oxygen sensor built as a specific-fit OE replacement for select Subaru Legacy applications. It is designed for upstream placement and provides the ECU with the feedback needed for accurate fuel control and emissions monitoring.

Key Features

• Specific-fit oxygen sensor for targeted vehicle applications
• Heated sensor design for faster operating response
• 3-wire configuration with 20-gauge wiring
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for proper harness connection
• Overall length: 7.99 in.; wiring harness length: 4.45 in.

Product Details

Walker Products Aftermarket 350-33065 is engineered for upstream oxygen sensor locations on 1991-1994 Subaru Legacy models. As an OE-style replacement from Walker Products Engine Management and Oxygen/Air-Fuel sensors, this part is built for the specified application and fitment position so the engine control unit receives the expected diagnostic signal. For Subaru Legacy owners diagnosing a check engine light or emissions-related fault, the 350-33065 is a direct-fit option for the upstream sensor position.

Walker Products has supplied engine management and fuel system components since 1946, and its sensor line is developed for modern diagnostic systems and application-specific fitment. The 350-33065 part number is also referenced as Walker Products Aftermarket 350-33065 in catalog listings for Subaru Legacy upstream oxygen sensor service.

What It Helps Address

• Illuminated malfunction indicator light tied to the upstream oxygen sensor
• Poor engine performance caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust readings
• Elevated exhaust emissions from a failing sensor
• Stored ECU fault codes related to oxygen sensor operation

Installation Notes

Confirm the vehicle is a 1991-1994 Subaru Legacy with an upstream oxygen sensor requirement before ordering. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear before installation, since damaged wiring can shorten sensor life and affect signal quality. Verify thread size, connector shape, and harness routing against the original part to ensure proper installation. This part cross-references Walker Products Aftermarket 350-33065 for the same application.

Quality Assurance

Walker Products is an Automotive ISO9001/TS 16949 certified manufacturer focused on engine management sensors and fuel system components. The 350-33065 is produced as a specific application replacement for Subaru Legacy upstream oxygen sensor service and is intended to deliver the diagnostic feedback expected by the ECU.