NTK 24445 Oxygen Sensor - Downstream Rear

Direct Fit Oxygen Sensor for Mazda 6

The NTK 24445 direct fit oxygen sensor is built for specific vehicle applications and matches the downstream rear location on select Mazda 6 models. It uses a heated, 4-wire design with a threaded mounting style to support accurate exhaust monitoring and OE-style replacement needs.

NTK’s Direct Fit Oxygen Sensor line focuses on streamlined coverage and OE application technology. As part of the NGK family of products, this line is backed by NTK’s ceramics expertise and manufacturing control from raw material through finished sensor, helping deliver consistent fit, form, and function for import and domestic vehicles.

Key Features

• Part number: 24445
• Specific-fit oxygen sensor for direct replacement applications
• Heated sensor design for faster operating response
• 4-wire configuration
• Threaded mounting type with 18 mm thread diameter
• 22-inch wiring harness length
• Downstream rear position for select Mazda 6 applications

Detailed Application Information

Compatible with 2006-2008 Mazda 6, downstream rear. This NTK 24445 oxygen sensor is intended for the B1S2 location and meets OEM standards for the listed application. It is a practical replacement choice when servicing the exhaust feedback system on a Mazda 6, especially when restoring proper sensor response and emissions monitoring.

This part cross-references DENSO Auto Parts (e.g., 234-4393) for the same application.

What This Sensor Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect downstream exhaust feedback readings
• Emissions system faults tied to the rear sensor circuit
• Rough or inconsistent fuel control caused by a failing sensor signal
• Service replacement needs for the Mazda 6 downstream rear oxygen sensor

Installation Notes and Tips

Verify the downstream rear position before installation and confirm the connector, thread size, and harness length match the original sensor. Use proper exhaust sensor service practices on the threaded mounting area to avoid damage during removal and installation. Confirm vehicle year and application details for 2006, 2007, and 2008 Mazda 6 models before ordering.

Quality Assurance

NTK manufactures oxygen sensors with extensive testing during production to help ensure quality and reliability that meet or exceed OE specifications. The 24445 is part of NTK’s Direct Fit Oxygen Sensor line, which is built to support accurate replacement for the listed Mazda 6 application.