Walker 350-35026 Oxygen Sensor - Upstream

Walker 350-35026 Oxygen Sensor Overview

Walker Products 350-35026 is a heated, specific-fit oxygen sensor engineered as an OE-style replacement for select Mazda applications. It is built for the upstream Bank 1 Sensor 1 position where accurate exhaust feedback is needed for engine management and emissions control.

Compatible with 2006-2013 Mazda 3, 2008-2010 Mazda 5, and 2009-2013 Mazda 3 Sport in upstream locations, this sensor is a direct-fit option for vehicles that require the correct connector, thread size, and signal response. The Walker Products Aftermarket line focuses on application-specific engine management sensors for precise fitment and ECU feedback.

Key Features

• Part number: 350-35026
• Heated oxygen sensor for upstream placement
• Specific fit for select Mazda 3, Mazda 3 Sport, and Mazda 5 applications
• 5-wire design with male radiused polygon connector
• 18.0 mm thread diameter and threaded mounting type
• Wiring harness length: 17.24 in.
• Overall length: 20.79 in.
• Walker Products Aftermarket engine management sensor line

Detailed Description

Walker Products 350-35026 is designed for upstream oxygen sensor service where the ECU relies on exhaust-gas feedback to manage air-fuel control. This heated sensor is built for specific fitment and is listed for Bank 1 Sensor 1 applications on select Mazda models, including 2006-2009 Mazda 3, 2008-2010 Mazda 5, 2009-2013 Mazda 3, and 2009-2013 Mazda 3 Sport in upstream positions. The part number 350-35026 is intended for vehicles that require the correct connector style, wire count, and threaded sensor body for proper installation and signal delivery.

Walker Products Aftermarket develops engine management and oxygen/air-fuel sensors as OE-style replacements for many vehicles worldwide. This product line is focused on application-specific fitment and diagnostic feedback that matches the needs of modern ECU-controlled emissions systems.

What It Helps Address

• Check engine light related to upstream oxygen sensor faults
• Poor engine performance caused by incorrect air-fuel feedback
• Increased fuel consumption from a failing sensor signal
• Elevated exhaust emissions from inaccurate exhaust monitoring
• Fault codes stored in the ECU for Bank 1 Sensor 1 or upstream sensor issues

Installation Notes and Tips

• Confirm the vehicle uses an upstream Bank 1 Sensor 1 oxygen sensor before ordering.
• Verify emissions configuration, as listed fitment includes non-California applications for certain Mazda 3 models.
• Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation.
• Check the threaded mounting point and connector orientation against the original sensor.
• Use the vehicle service information to confirm exact fitment for your Mazda 3, Mazda 3 Sport, or Mazda 5.

Quality Assurance

Walker Products is an automotive ISO 9001/TS 16949 certified company with a long history in engine management and fuel system components. The brand states that its oxygen and air-fuel sensors are engineered for application-specific replacement use and diagnostic system feedback required by the ECU.