Walker 350-31028 Oxygen Sensor - Upstream

Walker 350-31028 Oxygen Sensor Overview

Walker 350-31028 is a specific-fit oxygen sensor engineered as an OE-style replacement for select Ford and Mazda 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.

Compatible With 1989-1991 Mazda RX-7, upstream, and 1994-1997 Ford Aspire, upstream. This Walker Products Aftermarket sensor is a direct-fit option for vehicles that use a non-heated, threaded oxygen sensor with a male radiused-polygon connector.

Key Features

• Part number: 350-31028
• Specific-fit oxygen sensor for targeted vehicle applications
• Non-heated sensor design
• Upstream mounting position
• Threaded mounting type with 18.0 mm thread diameter
• Male connector with radiused polygon shape
• 12.32 in. wiring harness length
• 20-gauge wire construction
• Overall length: 15.87 in.

Product Details

Walker Products Engine Management and Oxygen/Air-Fuel sensors are developed as replacement parts for original equipment applications, with fitment matched to the vehicle, sensor position, and ECU feedback requirements. The 350-31028 is intended for upstream use on the Mazda RX-7 and Ford Aspire applications listed below, where accurate exhaust-gas feedback is needed for engine management and emissions control. If the sensor has failed, the vehicle may run poorly, use more fuel, trigger higher exhaust emissions, or illuminate the malfunction indicator light. The sensor, wiring harness, and connector should also be inspected for damage during diagnosis. Walker Products Aftermarket 350-31028 is a practical replacement choice for drivers servicing a 1989-1991 Mazda RX-7 upstream oxygen sensor or a 1994-1997 Ford Aspire upstream oxygen sensor.

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

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel mixture concerns
• Poor engine operation caused by inaccurate exhaust feedback
• Increased fuel consumption from faulty sensor input
• Elevated exhaust emissions from a worn upstream sensor

Installation Notes

Confirm the vehicle uses an upstream, non-heated oxygen sensor with the specified connector style and 18.0 mm thread diameter before installation. Inspect the harness and connector for heat damage, corrosion, or broken terminals, since those issues can shorten sensor life or affect signal quality. Verify the sensor location and application against the vehicle’s ECU fault code and service information before replacement.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and operates under Automotive ISO9001/TS 16949 certification. The 350-31028 is manufactured for application-specific fitment and diagnostic feedback requirements.