Walker 350-64015 Oxygen Sensor - Upstream

Walker 350-64015 Oxygen Sensor Overview

Walker Products 350-64015 is a heated oxygen sensor built as a specific-fit OE-style replacement for select applications. It is engineered for accurate ECU feedback, helping maintain proper air-fuel control and emissions monitoring on vehicles such as the Mazda RX-8.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for application-specific fitment. The 350-64015 follows that approach with the correct mounting style, connector design, and harness length for the listed upstream position.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit for the listed upstream application
• 4-wire design with 20-gauge wiring
• Threaded mounting type with 18.0 mm thread diameter
• Radiused polygon male connector for proper vehicle-side connection
• Wiring harness length: 19.21 in.; overall length: 22.76 in.

Detailed Description

The Walker 350-64015 oxygen sensor is designed for 2004-2008 Mazda RX-8 upstream service, including Bank 1 Sensor 1 applications. As an upstream heated oxygen sensor, it provides the ECU with the feedback needed to manage fuel delivery and monitor exhaust performance. This part number is built for the specified position, which helps ensure correct sensor placement and signal reporting on the vehicle.

For Mazda RX-8 owners searching for an upstream oxygen sensor, front oxygen sensor replacement, or Walker Products 350-64015 OE replacement, this sensor matches the listed fitment and connector configuration. It is also relevant for drivers addressing check engine light concerns tied to oxygen sensor performance.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Rough running caused by incorrect air-fuel feedback
• Increased fuel consumption from inaccurate sensor readings
• Higher exhaust emissions from poor mixture control
• Stored ECU fault codes linked to the affected sensor circuit

Installation Notes and Tips

Verify the vehicle is a 2004-2008 Mazda RX-8 with the listed upstream position before ordering. Inspect the sensor wiring harness and connector for heat damage, corrosion, or physical wear before installation, since damaged wiring can shorten sensor life and affect signal quality. Confirm the threaded mounting location and connector shape match the original unit.

For best results, compare the removed sensor to Walker Products 350-64015 before installation and clear any stored fault codes after the repair is complete.

Quality Assurance

Walker Products has produced engine management and fuel system components since 1946 and operates as an ISO 9001/TS 16949 certified company. The 350-64015 is manufactured as an application-specific replacement sensor for the listed vehicle fitment.