Walker 350-34026 Oxygen Sensor - Downstream, Upstream or Upstream Rear

Walker 350-34026 Oxygen Sensor Overview

Walker Products 350-34026 is a heated oxygen sensor built as a specific-fit OE replacement for select Mazda, Kia, and Suzuki applications. It is designed to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions performance.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered for application-specific fitment. The 350-34026 follows that approach with a threaded, 4-wire heated design for the correct mounting position on supported vehicles.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for the listed vehicle applications
• 4-wire configuration with male connector
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 14.88 in.
• Overall length: 18.43 in.
• Connector shape: radiused polygon
• Wire gauge: 20

Detailed Description

The Walker 350-34026 oxygen sensor is engineered for direct replacement use on supported Mazda 6, Mazda 626, Kia Rio, Suzuki Forenza, and Suzuki Verona applications. It is intended to restore accurate exhaust-gas feedback to the ECU so the engine management system can adjust air-fuel strategy correctly. This part number is built for the specified position and vehicle configuration, including upstream, downstream, and upstream rear locations where listed.

Walker Products Aftermarket has supplied engine management components since 1946, and this sensor line is developed around OE-style application matching rather than universal fitment. If your vehicle has a stored fault code, poor fuel economy, elevated emissions, or an illuminated malfunction indicator light, the oxygen sensor, wiring harness, and connector should be inspected for damage before replacement. This part number is 350-34026.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Rough engine operation caused by a failing sensor
• Increased fuel consumption from inaccurate exhaust readings
• Elevated exhaust emissions from degraded sensor response

Installation Notes and Tips

• Confirm the exact position before ordering: upstream, downstream, or upstream rear.
• Verify connector style, wire count, and thread diameter match the original sensor.
• Inspect the harness and connector for heat damage, corrosion, or broken terminals.
• Check for stored ECU fault codes after installation and clear codes as needed.
• Use the vehicle service procedure for proper sensor removal and torque.

Quality Assurance

Walker Products manufactures engine management sensors as OE-replacement components for specific applications and supports them through ISO 9001 / TS 16949 certified manufacturing practices. Part number 350-34026 is built to meet the fitment and feedback requirements of the listed vehicles, including Mazda 6, Mazda 626, Kia Rio, Suzuki Forenza, and Suzuki Verona applications.

Vehicle Fitment

• Fits 2003-2008 Mazda 6, upstream rear.
• Fits 2001-2005 Kia Rio, upstream.
• Fits 2001-2005 Kia Rio, downstream.
• Fits 2004-2005 Suzuki Forenza, upstream.
• Fits 2004-2005 Suzuki Verona, upstream.
• Fits 2001-2002 Mazda 626, upstream rear.
• Fits 2000 Mazda 626, upstream rear.