Walker 350-64016 Oxygen Sensor - Upstream

Upstream Oxygen Sensor for Mazda MX-5 Miata

Walker Products 350-64016 is a specific-fit heated oxygen sensor engineered for upstream placement and ECU feedback control. It is built for 2009-2015 Mazda MX-5 Miata applications where accurate exhaust monitoring is needed to help maintain proper engine management.

Walker Products Aftermarket focuses on OE-style replacement sensors for engine management systems, with application-specific fitment and connector design. The 350-64016 is made for the correct mounting position and signal response required by the vehicle’s diagnostic system.

Key Features

• Part number: 350-64016
• Heated oxygen sensor for upstream installation
• Specific fit for the listed Mazda MX-5 Miata applications
• 4-wire design with 20-gauge wiring
• Female connector with radiused polygon shape
• Threaded mounting type with 18.0 mm thread diameter
• Overall length: 9.96 in.
• Wiring harness length: 6.42 in.

Detailed Description

This Walker oxygen sensor is designed for the upstream position on 2009-2015 Mazda MX-5 Miata models, including Bank 1 Sensor 1 applications. As an engine management sensor, it helps the ECU monitor exhaust oxygen content so the fuel system can respond with the correct air-fuel adjustments. The 350-64016 is a direct-fit replacement built around the specified connector, harness length, and threaded mounting dimensions.

Walker Products 350-64016 is part of the Walker Products Aftermarket line, which is focused on replacement sensors for modern vehicle diagnostics. For shoppers searching for an upstream oxygen sensor for Mazda MX-5 Miata, a heated O2 sensor for Bank 1 Sensor 1, or a direct-fit replacement oxygen sensor for 2009-2015 Mazda MX-5 Miata, this part matches the listed application details.

This part cross-references no listed interchange numbers for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Poor fuel economy caused by incorrect exhaust feedback
• Rough engine operation from inaccurate air-fuel control
• Elevated exhaust emissions from a failing sensor
• Fault codes stored in the ECU for sensor-related issues

Installation Notes and Tips

Verify the upstream position, connector shape, wire count, and thread diameter before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten sensor life and affect signal quality. Confirm the vehicle application against the listed 2009-2015 Mazda MX-5 Miata fitment before replacement.

Quality Assurance

Walker Products states that its engine management and oxygen/air-fuel sensors are developed as OE replacement parts for many vehicles worldwide. The company is ISO 9001/TS 16949 certified and has supplied engine management and fuel system components since 1946.