Walker 350-34246 Oxygen Sensor - Center or Downstream

Walker 350-34246 Oxygen Sensor for Mazda

Walker Products 350-34246 is a heated oxygen sensor built as a specific-fit OE replacement for select Mazda applications. It is engineered to provide the ECU with the exhaust feedback needed for proper fuel control and emissions monitoring.

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors for precise application fitment. The 350-34246 follows that approach with a threaded, 4-wire heated design for downstream and center sensor positions on covered Mazda models.

Key Features

• Heated oxygen sensor for ECU feedback and emissions monitoring
• Specific-fit design for select Mazda 2, Mazda 3, and Mazda 6 applications
• 4-wire configuration with female connector
• Threaded mounting type with 18.0 mm thread diameter
• Wiring harness length: 29.84 in; overall length: 33.39 in
• Radiused polygon connector shape for application-specific fitment

Detailed Description

Walker 350-34246 is an emission control sensor designed for Mazda vehicles that use downstream or center oxygen sensor locations. It is listed for 2011-2017 Mazda 2, 2004-2009 Mazda 3, and 2006-2008 Mazda 6 applications, including California emissions and California-ESV configurations where specified. This part number is built to match the required sensor position and deliver the diagnostic signal the ECU expects.

For shoppers searching for a Mazda 3 downstream oxygen sensor, Mazda 6 B1S2 sensor, or a Mazda 2 downstream O2 sensor, Walker Products 350-34246 provides a direct-fit replacement path. The heated sensor design helps support faster operating response after startup, while the specific-fit connector and harness dimensions help maintain proper routing and connection.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor fuel economy caused by incorrect exhaust feedback
• Rough engine operation from inaccurate air-fuel monitoring
• Elevated exhaust emissions from a failing sensor
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Confirm the sensor position before ordering, since this part is used in downstream and center locations depending on the Mazda application. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation. Verify thread size, connector style, and harness routing against the original sensor to ensure proper fit on the vehicle.

Fits 2011-2017 Mazda 2, downstream. Fits 2009 Mazda 3, downstream or center depending on emissions configuration. Fits 2004-2008 Mazda 3, downstream or center depending on California-ESV application. Fits 2008 Mazda 3, center. Fits 2007-2008 Mazda 6, downstream. Fits 2006 Mazda 6, downstream.

Quality Assurance

Walker Products has produced engine management and oxygen sensor components since 1946 and operates as an ISO 9001 / TS 16949 certified company. Part number 350-34246 is manufactured as an application-specific replacement for the listed Mazda fitments.