Walker 350-34256 Oxygen Sensor - Downstream, Upstream or Upstream Right

Walker Oxygen Sensor for Lexus and Toyota

Walker Products 350-34256 is a heated oxygen sensor built as a specific-fit OE replacement for select Lexus and Toyota applications. It is engineered to provide the ECU with the feedback needed for accurate fuel control and emissions monitoring on the listed upstream and downstream positions.

Key Features

• Heated oxygen sensor with 4-wire design
• Specific fit for the listed Lexus and Toyota applications
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for vehicle-specific connection
• Wiring harness length: 15.28
• Overall length: 18.82
• Walker Products Aftermarket line for engine management and oxygen/air-fuel sensors

Product Details

Walker Products 350-34256 is part of the Walker Products Aftermarket line, which focuses on engine management sensors and oxygen/air-fuel sensors built for direct replacement use. This sensor is manufactured for the specified application and position so it can deliver the diagnostic feedback expected by the ECU. It is a practical choice for drivers servicing a Lexus GS430 upstream right oxygen sensor, a Lexus LS430 upstream right oxygen sensor, or a Toyota Supra downstream oxygen sensor application.

Compatible vehicle coverage includes 2002-2010 Lexus SC430 upstream right, 2001-2007 Lexus GS430 upstream right, 2001-2006 Lexus LS430 upstream right, 2001-2005 Lexus IS300 upstream, 1998-2000 Lexus SC300 upstream, 1998-1999 Lexus GS300 downstream, and 1998 Toyota Supra downstream. The part number 350-34256 is also a useful reference when searching for a Walker oxygen sensor for Lexus GS300 downstream or Lexus IS300 upstream service.

Common Issues This Sensor May Address

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

Installation Notes and Tips

Verify the sensor position before installation: upstream right, upstream, or downstream as listed for the vehicle. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before replacement. Confirm the threaded mounting point and connector style match the original sensor on the vehicle.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an Automotive ISO9001/TS 16949 certified company. The 350-34256 is built for the specified fitment and application, with the goal of restoring the diagnostic feedback required by the vehicle’s ECU.