Walker 350-34339 Oxygen Sensor - Downstream Rear

Walker 350-34339 Oxygen Sensor for Toyota RAV4

Walker Products 350-34339 is a heated oxygen sensor built as a specific-fit OE replacement for the downstream rear position on select Toyota RAV4 models. It is engineered to deliver the ECU feedback needed for proper fuel control and emissions monitoring on 2006-2012 Toyota RAV4 applications.

Key Features

• Specific-fit oxygen sensor for the downstream rear location
• Heated sensor design for faster operating response
• 4-wire configuration with 20-gauge wiring
• Radiused polygon male connector for application-specific connection
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 13.31 in.; overall length: 16.85 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for OE-style replacement use. Part number 350-34339 is made for the correct fitment position and is intended to provide the diagnostic signal the ECU expects from the downstream rear oxygen sensor on the Toyota RAV4. This part number is listed for 2006-2012 Toyota RAV4, downstream rear, and should be matched to the vehicle’s sensor location before installation. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Symptoms This Sensor May Address

• Check engine light or MIL related to oxygen sensor performance
• Poor engine operation caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel monitoring
• Higher exhaust emissions from a failing downstream sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes

Verify the downstream rear position on the vehicle 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 shape, and harness routing match the original part on the Toyota RAV4. Fits 2006-2012 Toyota RAV4, downstream rear.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacement parts and manufactured under Automotive ISO9001/TS 16949 quality systems. Since 1946, the brand has supplied engine management and fuel system components for vehicle applications worldwide.