Walker 350-35001 Oxygen Sensor - Upstream

Walker 350-35001 Oxygen Sensor Overview

Walker Products 350-35001 is a heated oxygen sensor built as a specific-fit OE-style replacement for select vehicles. It is engineered to provide the ECU with the exhaust feedback needed for fuel control and emissions monitoring, including applications such as the 2012-2015 Mazda 5 upstream Bank 1 Sensor 1 position.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fitment for the intended mounting position
• 5-wire design with 20-gauge wiring
• Radiused polygon male connector for vehicle-specific connection
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 11.34 in.
• Overall length: 14.88 in.

Detailed Description

The Walker Products Aftermarket line focuses on engine management and oxygen/air-fuel sensors engineered as OE replacement parts for a wide range of vehicles. Part number 350-35001 is built for the upstream oxygen sensor location and is intended to restore accurate exhaust-gas feedback to the engine control unit. For Mazda 5 models from 2012-2015, this sensor is listed for the upstream Bank 1 Sensor 1 position, making it a direct match for common front oxygen sensor service needs. Walker 350-35001 is also referenced as a front oxygen sensor option for various vehicle models within the listed fitment.

Walker Products has supplied engine management and fuel system components since 1946 and manufactures to automotive ISO 9001/TS 16949 standards. If the original sensor has aged or the connector, harness, or wiring shows damage, replacing the sensor can help restore proper feedback to the ECU and support normal engine operation.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Rough running caused by inaccurate exhaust feedback
• Increased fuel consumption from incorrect air-fuel correction
• Higher exhaust emissions from a failing heated O2 sensor
• Stored ECU fault codes tied to Bank 1 Sensor 1

Installation Notes and Tips

Confirm the vehicle uses the upstream Bank 1 Sensor 1 location before ordering. Inspect the sensor connector, harness, and surrounding wiring for physical damage before installation, since damaged wiring can shorten sensor life and affect signal quality. Verify thread size, connector shape, and wire count against the original part to ensure proper fit on the Mazda 5 and other listed applications. This part cross-references Bosch (e.g., 15733) for the same application.

Quality Assurance

Walker Products manufactures engine management sensors as OE-style replacements and backs production with automotive ISO 9001/TS 16949 quality systems. Part number 350-35001 is built for the specified application and position to deliver the diagnostic feedback expected by the ECU.