Walker 350-341007 Oxygen Sensor - Downstream Rear

Walker 350-341007 Oxygen Sensor for Toyota Sienna

Walker Products 350-341007 is an OE-style oxygen sensor engineered for the specified downstream rear location on select Toyota Sienna models. It is built to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions monitoring.

Key Features

• Direct-fit oxygen sensor for the downstream rear position
• Engineered for ECU feedback on the affected application
• OE replacement design for 2017-2020 Toyota Sienna
• Walker Products Aftermarket engine management sensor line
• Part number 350-341007 for application-specific lookup

Application Details

Compatible with 2017-2020 Toyota Sienna, downstream rear. This sensor is positioned after the catalytic converter and is used by the vehicle’s emissions system to monitor exhaust conditions and report data to the ECU. The Walker Products Aftermarket line focuses on application-specific fitment and sensor output for the listed vehicle coverage. Part number 350-341007 is also referenced as 350-341007 in catalog searches for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by incorrect exhaust feedback
• Elevated exhaust emissions from a failing sensor
• Rough engine operation tied to sensor signal issues
• Stored ECU fault codes for the downstream rear sensor circuit

Installation Notes

Install only in the specified downstream rear position on the Toyota Sienna. Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals before installation. Confirm the replacement matches the vehicle’s diagnostic requirements and clear fault codes after repair if needed.

Quality Assurance

Walker Products has manufactured engine management and oxygen/air-fuel sensors for decades and operates as an ISO 9001/TS 16949 certified company. The 350-341007 is built as an OE replacement for the listed application and is backed by Walker Products’ application-specific manufacturing standards.