Walker 350-64068 Oxygen Sensor - Upstream

Walker 350-64068 Oxygen Sensor for Subaru

Walker Products 350-64068 is a heated, threaded oxygen sensor built as a specific-fit replacement for select Subaru applications. It is engineered to provide the ECU with the feedback needed for proper fuel control and emissions monitoring on upstream locations.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed Subaru applications
• 4-wire configuration with male connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 12.52 in.
• Overall length: 16.06 in.
• Radiused polygon connector shape for application-specific fitment

Product Details

Walker Products Aftermarket focuses on OE-style engine management and oxygen/air-fuel sensors for precise application matching. Part number 350-64068 is designed for upstream use on 1999-2001 Subaru Impreza, Legacy, and Outback models listed in the fitment data, including California-ESV and Bank 1 Sensor 1 applications where specified. This sensor helps the engine control unit monitor exhaust oxygen content so the vehicle can maintain proper air-fuel control and emissions performance.

This part cross-references no listed interchange numbers in the provided data.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Rough running caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate sensor readings
• Higher exhaust emissions from poor mixture control
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes

• Confirm upstream location and match the vehicle-specific fitment notes before installation.
• Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion.
• Check the exhaust bung threads and sensor mounting surface for damage before threading in the new sensor.
• Verify the connector style and wire count match the original part on the vehicle.

Quality Assurance

Walker Products has manufactured engine management components since 1946 and operates under Automotive ISO9001/TS 16949 quality systems. The 350-64068 is built as a specific replacement for the listed Subaru applications and is intended to provide the ECU feedback required for proper system operation.