Walker 350-64047 Oxygen Sensor - Upstream

Walker 350-64047 Oxygen Sensor Overview

Walker Products 350-64047 is a heated oxygen sensor engineered as an OE-style replacement for specific Subaru Legacy and Toyota Hilux applications. It is built for the correct fitment position, connector style, and ECU feedback required by the vehicle’s emissions system.

For drivers diagnosing a check engine light, poor fuel economy, or elevated exhaust emissions, this Walker Products Aftermarket sensor provides a direct replacement option for the upstream oxygen sensor location on confirmed applications.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed vehicle applications
• Threaded mounting type with 18.0 mm thread diameter
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector for proper harness connection
• Wiring harness length: 21.18 in.; overall length: 24.72 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed as replacement parts for original equipment applications. Part number 350-64047 is designed to deliver the diagnostic feedback the ECU expects from the upstream sensor position, helping maintain proper fuel control and emissions monitoring. This part number 350-64047 is listed for 2010-2012 Subaru Legacy upstream, including Bank 1 Sensor 1 applications, and for 2005-2007 Toyota Hilux upstream service, with 2004 Toyota Hilux listed in N/A position notes.

Fits 2010-2012 Subaru Legacy, upstream. Fits 2005-2007 Toyota Hilux, upstream. Fits 2004 Toyota Hilux, N/A.

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

Common Issues This Sensor May Address

• Check engine light related to oxygen sensor performance
• Poor engine 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 affected sensor circuit

Installation Notes and Tips

Verify the connector shape, wire count, thread diameter, and sensor position before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten service life and affect signal quality. Confirm the vehicle application by year, make, model, and position before replacing the original sensor.

Quality Assurance

Walker Products has produced engine management and fuel system components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The 350-64047 oxygen sensor is manufactured for specific application fitment and ECU feedback requirements.