Walker 350-34496 Oxygen Sensor - Upstream

Walker 350-34496 Oxygen Sensor Overview

Walker Products 350-34496 is a heated upstream oxygen sensor built as a specific-fit OE replacement for select Toyota and Scion applications. It is engineered to provide the ECU with the feedback needed for accurate fuel control and emissions monitoring.

Compatible with 2015-2016 Toyota Yaris upstream, 2014 Toyota Yaris upstream, 2003-2005 Toyota Echo upstream, and 2004-2006 Scion xA and xB upstream applications, this sensor is a direct replacement for the original unit in the listed positions.

Key Features

• Specific-fit oxygen sensor for listed upstream applications
• Heated sensor design for faster operating response
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector for application-specific fitment
• Threaded mounting with 18.0 mm thread diameter
• Overall length: 14.88 in.; wiring harness length: 11.34 in.

Application Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed as OE-style replacements for a wide range of vehicles. Part number 350-34496 is built for the specified sensor location and is intended to restore the diagnostic feedback the ECU expects from the upstream oxygen sensor circuit. This part number 350-34496 is listed for Toyota Yaris, Toyota Echo, Scion xA, and Scion xB upstream positions.

This part cross-references Denso 234-9001 for the same application.

What It Helps Address

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

Installation Notes

Verify the vehicle year, make, model, and upstream sensor position before installation. Inspect the sensor wiring harness and connector for physical damage, since damaged wiring can shorten service life and affect signal quality. Confirm thread size and connector style match the original part before tightening the threaded sensor into place.

Quality Assurance

Walker Products is an Automotive ISO 9001/TS 16949 certified manufacturer with a long history in engine management components. The 350-34496 oxygen sensor is produced as an application-specific replacement to support proper ECU feedback on the listed Toyota and Scion vehicles.