Walker 350-64010 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Walker 350-64010 Oxygen Sensor Overview

Walker Products 350-64010 is a heated oxygen sensor built as a specific-fit OE-style replacement for select Toyota applications. It is engineered for upstream placement and provides the ECU with the feedback needed to monitor air-fuel control and emissions performance.

For Toyota Tacoma, Toyota Tundra, and Toyota 4Runner models in the listed California-emissions applications, this sensor is a direct-fit option for restoring proper exhaust feedback. The Walker Products Aftermarket line focuses on application-specific engine management sensors, and this part number follows that approach for the correct mounting position and connector style.

Key Features

• Part number: 350-64010
• Heated oxygen sensor for upstream use
• Specific fit for the listed Toyota applications
• 4-wire design with 20-gauge wiring
• 14.09 in. wiring harness length
• Radiused polygon male connector
• 18.0 mm thread diameter
• Flange mount design
• Overall length: 17.64 in.

Vehicle Fitment

• Fits 2001-2004 Toyota Tacoma, upstream.
• Fits 2001-2004 Toyota Tundra, upstream.
• Fits 2000 Toyota 4Runner, upstream, California-ESV vehicles.
• Fits 2000 Toyota 4Runner, upstream, California emissions ESV vehicles.
• Fits 2000 Toyota Tacoma, upstream, California emissions vehicles.
• Fits 2000 Toyota Tundra, upstream right, California emissions.
• Fits 2000 Toyota Tundra, upstream left, California CARB E.O. approved.
• Fits 1999 Toyota 4Runner, upstream, California emissions vehicles.

What This Sensor Helps Address

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

Installation Notes

Confirm the upstream position, connector shape, thread diameter, and harness length before installation. Inspect the sensor wiring, connector, and nearby harness for heat damage or physical wear, since damaged wiring can shorten service life and affect ECU feedback. This part cross-references Walker Products Aftermarket 350-64010 for the same application.

Quality Assurance

Walker Products develops engine management and oxygen/air-fuel sensors as OE replacement parts for worldwide vehicle applications. The brand operates under Automotive ISO9001/TS 16949 quality systems and has supplied engine management components since 1946.