Walker 350-64075 Oxygen Sensor - Upstream

Walker 350-64075 Oxygen Sensor for Mazda MX-5

Walker Products 350-64075 is a heated, specific-fit oxygen sensor engineered as an OE-style replacement for select Mazda MX-5 and Mazda MX-5 Miata 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.

Key Features

• Heated oxygen sensor for upstream installation
• Specific fit for confirmed Mazda MX-5 and Mazda MX-5 Miata applications
• 4-wire design with female radiused polygon connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 6.42 in.; overall length: 9.96 in.
• 20-gauge wire construction

Product Details

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors built for direct replacement use. Part number 350-64075 is made for the upstream position on 2006-2015 Mazda MX-5 and 2006-2008 Mazda MX-5 Miata models, including Bank 1 Sensor 1 applications. This oxygen sensor helps the ECU monitor exhaust oxygen content so the engine can maintain the correct air-fuel ratio and emissions performance.

This part cross-references common OE-style oxygen sensor applications for the same vehicle coverage.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough running or inconsistent engine performance
• Higher exhaust emissions from incorrect air-fuel control
• Fault codes stored in the ECU for Bank 1 Sensor 1

Installation Notes

Verify the connector shape, wire count, thread diameter, and upstream position before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten sensor life and affect readings. Confirm the vehicle application by year, model, and sensor location before ordering.

Quality Assurance

Walker Products is an ISO 9001/TS 16949 certified manufacturer with a long history in engine management components. The 350-64075 is built as a specific-fit replacement for the listed Mazda applications and is intended to deliver the diagnostic feedback required by the ECU.