Walker 350-64059 Oxygen Sensor - Upstream

Walker 350-64059 Oxygen Sensor for Mazda RX-8

Walker Products 350-64059 is a specific-fit heated oxygen sensor engineered as an OE-style replacement for the vehicle application listed below. It is built for upstream placement and is intended to provide the ECU with the feedback needed for accurate fuel control and emissions monitoring.

For 2009-2011 Mazda RX-8 models, this Walker Products Aftermarket oxygen sensor supports the upstream Bank 1 Sensor 1 position. If your RX-8 is showing a fault code, poor fuel economy, rough running, or an illuminated MIL, the sensor circuit should be inspected along with the wiring harness and connector.

Key Features

• Part number: 350-64059
• Heated oxygen sensor for faster operating response
• Specific fit for the listed Mazda RX-8 application
• Upstream mounting position
• 4-wire design with 20-gauge wiring
• 18.0 mm thread diameter and threaded mounting type
• Radiused polygon male connector
• Wiring harness length: 21.18
• Overall length: 24.72

Detailed Description

Walker Products 350-64059 is part of the Walker Products Aftermarket engine management line, which focuses on replacement sensors built for defined vehicle applications and ECU feedback requirements. This oxygen sensor is a heated, specific-fit unit for the upstream location on 2009-2011 Mazda RX-8 models, including Bank 1 Sensor 1 service needs. The design details, including the 4-wire configuration, threaded mount, and connector style, are matched to the application for proper installation and signal delivery.

Use this part when servicing an upstream oxygen sensor on a Mazda RX-8 and you need a direct replacement identified by part number 350-64059. The same part number is also referenced as 350-64059 in catalog listings for this application.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Poor fuel economy caused by incorrect air-fuel feedback
• Rough engine operation from inaccurate sensor readings
• Increased exhaust emissions from a failing sensor
• Stored ECU fault codes tied to Bank 1 Sensor 1

Installation Notes and Tips

Confirm the vehicle is a 2009-2011 Mazda RX-8 and verify the upstream Bank 1 Sensor 1 location before ordering. Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals, since physical damage can shorten service life and affect signal quality. Threaded installation requires the correct sensor socket and careful routing of the harness away from exhaust heat.

Quality Assurance

Walker Products states that its engine management sensors are developed as OE replacement parts for worldwide vehicle applications and manufactured under Automotive ISO9001/TS 16949 quality systems. Since 1946, the brand has supplied engine management and fuel system components for automotive service use.