Walker 350-34697 Oxygen Sensor - Downstream Rear

Walker 350-34697 Oxygen Sensor for Toyota and Lexus

Walker Products 350-34697 is a heated oxygen sensor built as a specific-fit replacement for downstream rear applications. It is engineered for vehicles that rely on accurate exhaust feedback to help the ECU manage fuel control and emissions monitoring.

Compatible With Toyota Highlander and Lexus RX330/RX350 applications, this sensor is positioned for the downstream rear location and uses a threaded mount with a female connector. The Walker Products Aftermarket line focuses on application-specific engine management and oxygen/air-fuel sensors for OE-style replacement needs.

Key Features

• Part number: 350-34697
• Heated oxygen sensor design for faster operating response
• Specific fit for the listed Toyota and Lexus applications
• Downstream rear position for correct exhaust system placement
• 4-wire configuration with 20-gauge wiring
• Female connector with radiused polygon shape
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 23.15
• Overall length: 26.69

Detailed Description

Walker Products 350-34697 is an OE-style oxygen sensor for vehicles that require precise downstream rear exhaust monitoring. It is listed for 2004-2013 Toyota Highlander, 2004-2006 Lexus RX330, and 2007-2009 Lexus RX350 applications, with fitment notes that distinguish Japan-built and non-Japan-built RX350 models where applicable. This part number is designed around the specific application and sensor position so the ECU receives the correct diagnostic feedback from the exhaust system.

Walker Products Aftermarket develops engine management and oxygen/air-fuel sensors as replacement parts for a wide range of vehicles worldwide. The 350-34697 follows that approach with application-specific fitment, a heated sensor design, and connector and harness details matched to the listed vehicles. This part cross-references Denso (e.g., 234-4622) for the same application.

What It Helps Address

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

Installation Notes and Tips

Install only in the listed downstream rear position for the correct vehicle and build type. Before replacement, inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten sensor life and affect signal quality. Confirm thread size, connector style, and harness routing against the original part before installation.

Quality Assurance

Walker Products is an Automotive ISO9001/TS 16949 certified company with a long history in engine management components dating back to 1946. The 350-34697 is manufactured as a specific replacement sensor for the listed applications and is backed by Walker Products’ OE-focused product development and catalog support.