Walker 350-64126 Oxygen Sensor - Upstream or Upstream Rear

Walker Oxygen Sensor for Lexus and Toyota

Walker Products 350-64126 is an OE-style oxygen sensor engineered for specific upstream applications on Lexus RX and Toyota Highlander models. It is built to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions performance.

Key Features

• OE replacement oxygen sensor for targeted upstream positions
• Application-specific fitment for Lexus RX350, RX350L, RX450hL, and Toyota Highlander
• Supports ECU feedback for air-fuel management and emissions monitoring
• Walker Products Aftermarket line for engine management and sensor replacement
• Part number 350-64126 for accurate catalog matching

Detailed Description

Walker Products 350-64126 is part of the Walker Products Aftermarket engine management sensor line, developed as an OE replacement for vehicles that require precise oxygen sensor feedback. This sensor is used in upstream locations across select Lexus RX and Toyota Highlander applications, including 2022 Lexus RX350 upstream right, 2022 Lexus RX350L upstream left, 2022 Lexus RX450hL upstream left, 2016-2021 Lexus RX350 upstream rear, 2018-2021 Lexus RX350L upstream rear, 2021 Lexus RX450hL upstream rear, and 2015-2019 Toyota Highlander upstream positions.

For Lexus RX and Toyota Highlander vehicles, the 350-64126 helps the ECU monitor exhaust oxygen content so the engine management system can adjust operation as needed. Walker Products designs these sensors for the specific application and position, which is important for accurate diagnostic feedback and proper system operation.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate sensor readings
• Higher exhaust emissions from a failing upstream sensor
• Fault codes stored in the ECU for sensor-related issues

Installation Notes and Tips

Verify the exact year, model, and sensor position before ordering. For Lexus RX350, RX350L, RX450hL, and Toyota Highlander applications, confirm whether the vehicle uses the upstream right, upstream left, or upstream rear location listed in the fitment data. Inspect the sensor connector, wiring harness, and surrounding exhaust components for damage before installation, since physical wear can shorten sensor life and affect readings.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and manufactures sensors for specific vehicle applications. The company is ISO 9001/TS 16949 certified, with production focused on OE-style replacement fitment and ECU-relevant diagnostic feedback.