Walker 350-64042 Oxygen Sensor - Upstream

Walker 350-64042 Oxygen Sensor for Subaru

Walker Products 350-64042 is a heated, threaded oxygen sensor built as a specific-fit OE replacement for select Subaru applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper air-fuel control on upstream sensor locations.

• Heated oxygen sensor for faster operating response
• Specific fit for the listed Subaru Legacy and Subaru Outback applications
• 4-wire design with female connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 17.24 in.; overall length: 20.79 in.
• Radiused polygon connector shape for application-specific fitment

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built to match original equipment application requirements. Part number 350-64042 is designed for upstream placement on 2010-2012 Subaru Legacy and 2010-2012 Subaru Outback models, including Bank 1 Sensor 1 applications and front oxygen sensor positions noted in the fitment data. If the original sensor is failing, the ECU may store fault codes and the vehicle may run rich or lean, increase fuel consumption, raise emissions, or trigger the malfunction indicator light. Walker 350-64042 is built to provide the feedback needed for proper engine management on these Subaru models.

This part cross-references no listed aftermarket part numbers for the same application.

What It Helps Address

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

Installation Notes and Tips

Install this sensor in the upstream position specified for the vehicle application. Before replacement, inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten sensor life and affect signal quality. Confirm connector shape, thread diameter, wire count, and harness length against the original part before installation.

Quality Assurance

Walker Products manufactures engine management sensors under ISO 9001/TS 16949 quality systems and has supplied automotive sensor and fuel system components since 1946. The 350-64042 is built for application-specific fitment and ECU feedback requirements on the listed Subaru Legacy and Subaru Outback models.