Walker 350-34406 Oxygen Sensor - Downstream Left or Downstream Right

Walker 350-34406 Oxygen Sensor for OE Replacement

Walker Products 350-34406 is a heated oxygen sensor built as a specific-fit OE replacement for select Toyota and Lexus applications. It is engineered to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions performance.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fitment for the listed vehicle applications
• 4-wire design with male connector
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 29.06 in.; overall length: 32.6 in.
• Radiused polygon connector shape for application-specific connection

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered for OE-style replacement use. Part number 350-34406 is designed for the correct application and mounting position so the sensor can provide the ECU with the feedback needed for closed-loop fuel management. This part is listed for 2009 Toyota Corolla, plus downstream left and downstream right applications on 2001-2006 Lexus LS430 and 2002-2005 Lexus SC430. If you are searching for a 2009 Toyota Corolla oxygen sensor or a downstream Lexus LS430 oxygen sensor replacement, 350-34406 is the direct-fit option to review.

Common Issues This Sensor May Address

• 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 readings
• Higher exhaust emissions from a failing heated oxygen sensor
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Confirm the vehicle year, make, model, and sensor position before ordering. For Lexus LS430 and SC430 applications, verify whether the vehicle requires downstream left or downstream right placement. Inspect the sensor wiring harness and connector for damage before installation, since physical wear can shorten sensor life. Threaded mounting and the 4-wire heated design should be matched to the original configuration for proper operation.

Quality Assurance

Walker Products manufactures engine management sensors as OE-replacement parts and operates as an Automotive ISO 9001/TS 16949 certified company. The Walker Products Aftermarket line is built around application-specific fitment and ECU feedback requirements for modern emissions systems.