Walker 350-64014 Oxygen Sensor - Upstream Front or Upstream Rear

Walker Products Oxygen Sensor for Toyota and Lexus

Walker Products Part Number 350-64014 is a heated oxygen sensor built for specific OE-style fitment and ECU feedback on select Toyota and Lexus applications. It is engineered for the upstream front or upstream rear positions listed below, with vehicle-specific connector and harness details to match the original sensor layout.

Key Features

• Heated oxygen sensor for precise exhaust feedback
• Specific fit design for the listed Toyota Avalon, Toyota Sienna, and Lexus ES300 applications
• 4-wire configuration with a 20-gauge harness
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for application-specific connection
• Overall length: 18.82 in.; wiring harness length: 15.28 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed as OE replacement parts for a wide range of vehicles. Part Number 350-64014 is built for specific placement and feedback requirements, helping the ECU monitor exhaust conditions on the listed vehicles. This sensor is a direct-fit style replacement for 2000-2004 Toyota Avalon, 2001-2003 Toyota Sienna, and 2000-2001 Lexus ES300 applications in the upstream front or upstream rear positions shown in the fitment data. Walker Products 350-64014 is designed around the original sensor location, connector style, and threaded mounting format for accurate replacement service.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel monitoring
• Higher exhaust emissions from a failing heated oxygen sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for upstream front and upstream rear locations depending on the vehicle. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation. Confirm thread diameter, connector shape, and harness length against the original unit to ensure proper routing and fit. Fits 2000-2004 Toyota Avalon, upstream front; fits 2001-2003 Toyota Sienna, upstream rear; fits 2000-2001 Lexus ES300, upstream rear.

Quality Assurance

Walker Products has produced engine management and fuel system components since 1946 and operates as an ISO 9001/TS 16949 certified company. The Walker Products Aftermarket line is built around application-specific replacement parts for modern diagnostic systems, including oxygen sensors that provide the ECU with the feedback required for proper operation.