Walker 350-64002 Oxygen Sensor - Upstream

Walker 350-64002 Upstream Oxygen Sensor

Walker Products 350-64002 is a specific-fit heated oxygen sensor for upstream placement on select Subaru Impreza and Saab 9-2X applications. It is engineered as an OE-style replacement to deliver the diagnostic feedback the ECU expects from the affected sensor location.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the correct application and mounting position
• 4-wire configuration with a male radiused polygon connector
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 28.66 in.; overall length: 32.2 in.
• Walker Products Aftermarket line for engine management and oxygen sensor replacement

Product Details

Walker Products 350-64002 is built for upstream oxygen sensor service on 2002-2005 Subaru Impreza and 2005 Saab 9-2X models. This sensor is intended for Bank 1 Sensor 1 applications where the ECU relies on accurate exhaust feedback to manage fuel control and emissions. The heated design helps the sensor reach operating temperature more quickly, supporting stable signal output during normal engine operation. Walker Products has focused on engine management and oxygen/air-fuel sensors as OE replacement parts since 1946, and this part reflects that application-specific approach. This part cross-references no listed interchange numbers for the same application.

Common Issues This Sensor Can Address

• Check engine light or malfunction indicator light related to oxygen sensor performance
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation from incorrect air-fuel control
• Higher exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Confirm the vehicle is a 2002-2005 Subaru Impreza or 2005 Saab 9-2X with an upstream Bank 1 Sensor 1 oxygen sensor location before ordering. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation. Verify the threaded mounting point and connector shape match the original sensor to ensure proper fitment and ECU communication.

Quality Assurance

Walker Products manufactures engine management sensors as OE replacement components and operates as an ISO 9001 / TS 16949 certified company. The 350-64002 is built for the specified application and position to provide the diagnostic feedback required by the vehicle’s ECU.