Walker 350-64029 Oxygen Sensor - Upstream or Upstream Front

Walker Oxygen Sensor for OE-Style Engine Management

Walker Products 350-64029 is a specific-fit heated oxygen sensor built for precise exhaust feedback and ECU monitoring. It is engineered for direct application use on select Scion xB and Lexus RX350 models, with fitment matched to the sensor position and connector style.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• Specific-fit design for the listed vehicle applications
• 4-wire configuration with a male radiused polygon connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 15.28 in.; overall length: 18.82 in.
• Walker Products Aftermarket engine management and oxygen sensor line

Product Details

Walker Products 350-64029 is part of the Walker Products Aftermarket line, which focuses on engine management and oxygen/air-fuel sensors for OE-style replacement needs. This sensor is designed to provide the diagnostic feedback the ECU expects from the affected exhaust location. It is a direct-fit oxygen sensor for applications including 2011-2015 Scion xB upstream positions and 2011-2012 Lexus RX350 upstream front positions. The part number 350-64029 is also referenced as a fitment-specific replacement for vehicles that require a heated, threaded, 4-wire sensor with the listed connector and harness dimensions.

Fits 2011-2015 Scion xB, upstream. Fits 2011-2012 Lexus RX350, upstream front. This part cross-references no listed alternate part numbers in the provided data.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by incorrect exhaust feedback
• Rough engine operation from inaccurate air-fuel monitoring
• Elevated exhaust emissions from a failing upstream sensor
• Stored ECU fault codes tied to the sensor circuit or related systems

Installation Notes

Confirm the sensor position before installation, since this application uses upstream and upstream front fitment. Inspect the sensor, wiring harness, and connector for heat damage, abrasion, or corrosion before replacement. Verify thread size, connector shape, and wire count against the original part to ensure proper installation on the Scion xB or Lexus RX350 application.

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. The brand has supplied engine management and fuel system components since 1946.