Walker 350-341037 Oxygen Sensor - Downstream or Downstream Front

Walker Oxygen Sensor for Toyota and Lexus

Walker Products 350-341037 is a heated oxygen sensor built as an OE-style replacement for specific Toyota and Lexus applications. It is engineered for the correct fitment position and ECU feedback, making it a direct choice for downstream sensor service on vehicles such as the Toyota Corolla, Prius, and Lexus RX350.

Key Features

• Heated oxygen sensor for precise exhaust monitoring
• Specific-fit design for the listed Toyota and Lexus applications
• 14.29 wiring harness length with 22-gauge wire
• 4-wire design with male connector
• 18.00 thread diameter and 17.83 overall length
• OE replacement construction for downstream sensor locations

Product Details

Walker Products Aftermarket 350-341037 is part of the Walker Products Engine Management and Oxygen/Air-Fuel sensor line, developed for replacement use on vehicles worldwide. This sensor is designed to match the application, mounting position, and diagnostic feedback requirements expected by the ECU. For Toyota Corolla, Prius, Prius AWD-e, Prius Prime, Sienna, and Highlander models, as well as Lexus RX350, RX350L, RX450h, and RX450hL applications, it supports downstream oxygen sensor service where accurate exhaust data is needed for engine management.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Reasons for Replacement

• Check engine light or malfunction indicator light 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 sensor or related wiring

Installation Notes and Tips

Confirm the exact position before ordering, since this sensor is listed for downstream, downstream front, and downstream left applications depending on vehicle and model year. Inspect the sensor, connector, and wiring harness for physical damage before installation. Verify thread diameter, connector style, and harness length against the original part to ensure proper fit on the Toyota Corolla, Prius, and Lexus RX applications.

Quality Assurance

Walker Products has manufactured engine management and fuel system components since 1946 and operates as an Automotive ISO 9001/TS 16949 certified company. The 350-341037 is built as a specific-fit replacement to deliver the diagnostic feedback required by the vehicle ECU.