Walker 350-31005 Oxygen Sensor - Upstream

Walker 350-31005 Oxygen Sensor for Toyota and Lexus

Walker Products 350-31005 is a specific-fit oxygen sensor engineered as an OE-style replacement for select Toyota and Lexus applications. It is built for upstream placement and is designed to provide the ECU with the feedback needed for proper fuel control and emissions monitoring.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for exact application fitment. The 350-31005 follows that approach with a non-heated design, a 15.28-inch wiring harness, a 20-gauge lead, a male radiused-polygon connector, and a flange-mount configuration.

Key Features

• Part number: 350-31005
• Specific-fit oxygen sensor for upstream installation
• Non-heated sensor design
• 15.28-inch wiring harness length
• 20-gauge wire with 1-wire construction
• Male radiused-polygon connector
• 18.0 mm thread diameter
• 18.82-inch overall length
• Flange mount design

Application Details

Compatible With select 1992-1995 Toyota MR2, Toyota Supra, Lexus GS300, and Lexus SC300 upstream sensor locations. This part number is listed for specific cylinder-bank and emissions-package configurations, including non-California ESV and California-excluded applications where noted. For example, it fits 1993-1995 Toyota MR2, upstream; 1993-1995 Toyota Supra, upstream; 1993-1994 Lexus GS300, upstream; and 1992-1995 Lexus SC300, upstream.

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

What This Sensor 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
• Stored ECU fault codes tied to the affected sensor circuit

Installation Notes and Tips

Confirm the vehicle’s exact year, engine bank, cylinder grouping, and emissions package before ordering. This sensor is application-specific, so connector style, thread diameter, harness length, and mounting type should match the original unit. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear before installation, since damaged wiring can shorten sensor life and affect ECU feedback.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates as an Automotive ISO 9001 / TS 16949 certified company. The 350-31005 is manufactured for the specified application and fitment position to support proper diagnostic feedback in the vehicle’s emissions control system.