Walker 350-341005 Oxygen Sensor - Downstream Front

Walker Oxygen Sensor for Toyota Sienna

Walker Products 350-341005 is a heated oxygen sensor built as a specific-fit OE replacement for select Toyota Sienna applications. It is engineered 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 Sienna applications
• 4-wire configuration with male connector
• 18.00 mm thread diameter
• Wiring harness length: 22.17 in.; overall length: 25.71 in.
• Wire gauge: 20

Application Details

Compatible with 2015 Toyota Sienna, downstream front, and 2016 Toyota Sienna, downstream front. This Walker Products Aftermarket part number 350-341005 is built for the listed position so the sensor signal matches the vehicle’s diagnostic requirements. Walker Products 350-341005 is a direct-fit oxygen sensor for Toyota Sienna models with the downstream front location specified in the fitment data.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed as OE-style replacements for global vehicle applications. The brand’s sensor lineup is built around application-specific fitment, connector style, and harness length to match the original installation point and ECU feedback needs.

What It Helps Address

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

Installation Notes

• Verify the downstream front position before ordering or installation.
• Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion.
• Confirm thread size and connector style match the original sensor.
• Clear diagnostic trouble codes after installation and verify system operation.

Quality Assurance

Walker Products manufactures engine management sensors under ISO 9001 and TS 16949 quality systems. The 350-341005 is built as an OE replacement for the specified Toyota Sienna applications and is intended to deliver the diagnostic feedback required by the ECU.