NTK 24446 Oxygen Sensor - Downstream

NTK Direct Fit Oxygen Sensor for Mazda 3

NTK Direct Fit Oxygen Sensor 24446 is a heated, specific-fit replacement for downstream applications on select Mazda 3 and Mazda 3 Sport models. It is built for the 2006-2009 Mazda 3 and 2009 Mazda 3 Sport with Federal Emissions, matching the OE-style fit and connector layout needed for a direct replacement.

Key Features

• Direct Fit Oxygen Sensor for specific applications
• Heated sensor design for faster operating response
• 4-wire configuration
• 18 mm thread diameter with threaded mounting
• 30.25 in. wiring harness length
• OE-style replacement for downstream B1S2 locations

Product Details

NTK 24446 is part of the Direct Fit Oxygen Sensor line, a product line focused on application-specific replacement sensors for import and domestic vehicles. NTK draws on its OE sensor manufacturing background and ceramic technology to deliver a sensor that matches the original fit, form, and function expected in emissions control service. This part cross-references Bosch 15253 for the same application.

Compatible With 2006-2009 Mazda 3, downstream B1S2 Federal Emissions applications and 2009 Mazda 3 Sport, downstream B1S2 Federal Emissions applications. If you are replacing a downstream oxygen sensor on a Mazda 3 or Mazda 3 Sport, part number 24446 provides the correct threaded, heated, specific-fit configuration.

Common Issues This Sensor Can Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel monitoring feedback from a worn sensor
• Emissions test failure caused by a faulty oxygen sensor
• Rough or inconsistent engine management data from aging sensor elements
• Connector or fitment mismatch when replacing the original sensor

Installation Notes and Tips

Verify the downstream B1S2 location before installation and confirm Federal Emissions fitment for your vehicle. Match the connector, wire count, and thread size to the original sensor before removal. Inspect the harness routing and exhaust-side mounting point to ensure the replacement sensor installs without strain on the wiring.

Quality Assurance

NTK manufactures oxygen sensors to meet or exceed OE specifications and tests them during production for quality and reliability. As the Sensor Specialist and a major OE oxygen sensor supplier, NTK supports direct-fit replacement coverage for applications like the Mazda 3 and Mazda 3 Sport.