Walker 350-31021 Oxygen Sensor - Downstream

Walker 350-31021 Oxygen Sensor for Lexus GS300

Walker Products 350-31021 is a specific-fit oxygen sensor engineered as an OE-style replacement for the downstream position on select 1993-1994 Lexus GS300 models. It is built to deliver the ECU feedback needed for proper fuel control and emissions monitoring on non-heated applications.

For Lexus GS300 owners diagnosing a downstream sensor fault, this Walker Products Aftermarket part number 350-31021 provides a direct-fit solution matched to the application and mounting position.

Key Features

• Specific-fit oxygen sensor for downstream placement
• Non-heated sensor design
• 18.0 mm thread diameter
• Flange mount installation style
• Male connector with radiused polygon shape
• 11.34 in. wiring harness length
• 20-gauge wire construction with 1 wire
• Overall length: 14.88 in.

Application Details

Compatible With 1993-1994 Lexus GS300, downstream. This part is intended for downstream placement on vehicles without California emissions certification, and it also matches non-California ESV vehicle applications listed for the Lexus GS300. Walker Products Aftermarket focuses on application-specific engine management sensors, and part number 350-31021 is built to match the required fitment position and ECU feedback for this vehicle family.

Walker Products has supplied engine management and oxygen/air-fuel sensors since 1946, with manufacturing aligned to ISO 9001 and TS 16949 quality systems. This part cross-references no additional part numbers in the provided data.

What This Sensor Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect fuel mixture feedback to the ECU
• Reduced fuel economy caused by a failing sensor
• Higher exhaust emissions from inaccurate sensor readings
• Poor engine operation tied to sensor, wiring, or connector damage

Installation Notes

Verify the downstream location before ordering and compare the connector shape, thread diameter, and harness length to the original sensor. Inspect the wiring harness and connector for heat damage, corrosion, or abrasion before installation, since physical damage can shorten sensor life. Confirm the vehicle is the non-California emissions version listed for this application.

Quality Assurance

Walker Products manufactures this oxygen sensor as an OE replacement for the specified application and position. The brand’s engine management sensor line is produced under ISO 9001 and TS 16949 quality standards.