Walker 350-64057 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Walker 350-64057 Oxygen Sensor for Toyota

Walker Products 350-64057 is a heated, specific-fit oxygen sensor engineered as an OE-style replacement for select Toyota applications. It is built for upstream placement and is designed to provide the ECU with the feedback needed for proper fuel control and emissions monitoring.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed Toyota applications
• Upstream placement for engine management feedback
• 4-wire configuration with a male connector
• Flange mount design with 18.0 mm thread diameter
• Wiring harness length: 9.76 in.; overall length: 13.31 in.
• Walker Products Aftermarket part number 350-64057

Detailed Description

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for direct replacement use. Part number 350-64057 is a heated oxygen sensor with a radiused polygon connector shape, 20-gauge wiring, and a specific-fit application profile. It is listed for upstream positions on Toyota Tacoma, Toyota Tundra, and Toyota 4Runner models across the 1999-2004 model years, including California emissions and California-ESV applications where noted. This sensor is intended to restore accurate exhaust feedback to the ECU so the engine can maintain proper air-fuel control.

Vehicle Fitment

• Fits 2001-2004 Toyota Tacoma, upstream.
• Fits 2001-2004 Toyota Tacoma, upstream, Bank 1 Sensor 1.
• Fits 2001-2004 Toyota Tacoma, upstream, front oxygen sensor applications.
• Fits 2001-2004 Toyota Tundra, upstream.
• Fits 2001-2002 Toyota 4Runner, upstream.
• Fits 1999-2000 Toyota 4Runner, upstream, California emissions vehicles.
• Fits 2000 Toyota 4Runner, upstream, California-ESV vehicles.
• Fits 2000 Toyota Tacoma, upstream, California emissions vehicles.
• Fits 2000 Toyota Tacoma, upstream, California-ESV vehicles.
• Fits 2000 Toyota Tundra, upstream right, California emissions.
• Fits 2000 Toyota Tundra, upstream left, California CARB E.O. approved application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough running caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate exhaust readings
• Elevated exhaust emissions from a failing upstream sensor
• Fault codes stored in the ECU for sensor-related issues

Installation Notes

Confirm the vehicle year, model, emissions package, and sensor position before installation. For Toyota Tacoma, Toyota Tundra, and Toyota 4Runner applications, verify whether the vehicle uses an upstream, upstream right, or upstream left sensor location. Inspect the sensor, wiring harness, and connector for physical damage before replacement, since damaged components can shorten service life and affect ECU feedback.

Quality Assurance

Walker Products has supplied engine management components since 1946 and operates with ISO 9001/TS 16949 certification. The 350-64057 oxygen sensor is manufactured for the specified application and fitment position to support accurate diagnostic feedback in the vehicle’s emissions control system.