Walker 350-34116 Oxygen Sensor - Downstream Left or Downstream Right

Walker 350-34116 Oxygen Sensor for Lexus

Walker Products 350-34116 is a heated oxygen sensor built as an OE replacement for specific Lexus applications. It is engineered for downstream placement and provides the ECU with the feedback needed to monitor exhaust system performance and emissions control.

Key Features

• Heated oxygen sensor for downstream use
• Specific fit application for direct vehicle matching
• 4-wire design with 22-gauge wiring
• 19.21 in. wiring harness length and 22.76 in. overall length
• 18.0 mm thread diameter with threaded mounting
• Radiused polygon male connector for OE-style connection
• Walker Products Aftermarket engine management sensor line

Product Details

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors developed as OE-style replacements for a wide range of vehicles. Part number 350-34116 is built for specific fitment and downstream sensor locations, helping maintain the diagnostic feedback the ECU expects from the exhaust system. This part number is listed for Lexus GS350, IS300, IS350, RC300, and RC350 applications, including downstream right and downstream left positions where specified. If you are replacing a Lexus oxygen sensor and need a direct-fit downstream oxygen sensor, Walker 350-34116 is matched to the listed vehicle and position combinations.

This part cross-references no listed aftermarket part numbers in the provided data.

What It Helps Address

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

Installation Notes and Tips

Verify the exact year, model, and downstream position before ordering. For Lexus IS300, IS350, RC300, RC350, and GS350 applications, confirm whether the vehicle calls for downstream left or downstream right placement. Inspect the sensor wiring harness and connector for damage before installation, since physical wear can shorten sensor life and affect operation. Threaded mounting and the 18.0 mm thread diameter should be matched to the original sensor location for proper installation.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacements and manufactured under Automotive ISO 9001 / TS 16949 quality systems. Since 1946, the brand has supplied engine management sensors and fuel system components for vehicle applications worldwide.