Walker 350-64127 Oxygen Sensor - Upstream

OE Replacement Upstream Oxygen Sensor

Walker Products 350-64127 is a specific-fit heated oxygen sensor engineered for upstream placement and OE-style feedback to the ECU. It is built for Lexus applications where accurate air-fuel monitoring is needed to maintain drivability, emissions control, and fuel economy.

Compatible With 2016-2025 Lexus IS200t, IS300, RC200t, RC300, GS200t, and GS300 upstream positions, this sensor is designed around the application-specific fitment and connector layout required for direct replacement service.

Key Features

• Part number: 350-64127
• Heated oxygen sensor for upstream installation
• Specific-fit design for the listed Lexus applications
• 4-wire configuration with 20-gauge wiring
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon connector shape with male connector gender
• Wiring harness length: 14.76 in.; overall length: 17.71 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built as OE replacement parts for a wide range of vehicles. The 350-64127 is manufactured for the specified application and upstream position so the ECU receives the correct diagnostic feedback from the sensor circuit. For Lexus IS300, RC300, GS300, GS200t, IS200t, and RC200t models, this helps restore proper sensor response when the original unit is worn, contaminated, or electrically damaged.

Walker Products has supplied engine management and fuel system components since 1946 and operates with Automotive ISO9001/TS 16949 certification. The Walker Products 350-64127 is a practical choice for drivers and technicians looking for an OE-style upstream oxygen sensor for Lexus IS300 and RC300 service work.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Poor engine performance caused by incorrect air-fuel feedback
• Increased fuel consumption from a degraded sensor signal
• Higher exhaust emissions from inaccurate mixture control
• Diagnostic trouble codes stored in the ECU for sensor-related issues

Installation Notes and Tips

Confirm the vehicle year, model, and upstream position before ordering. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation, since physical damage can shorten sensor life and affect operation. Verify the threaded mounting location and connector style match the original part on the vehicle.

Quality Assurance

Walker Products manufactures this sensor as an OE replacement for the listed application and backs its engine management line with ISO9001/TS 16949 quality processes. The 350-64127 is built to deliver the diagnostic feedback expected by the ECU in the specified Lexus upstream oxygen sensor applications.