NTK 22129 Oxygen Sensor - Downstream

NTK Direct Fit Oxygen Sensor for Mazda 6

NTK 22129 is a direct fit heated oxygen sensor for the downstream position on select 2009-2013 Mazda 6 models. Built as a specific-fit replacement, it follows OE-style mounting and wiring details for a straightforward service replacement.

Key Features

• Direct fit oxygen sensor for the downstream location
• Heated sensor design for faster operating response
• Specific fit application for select Mazda 6 vehicles
• 4-wire configuration with a 34.7500 wiring harness length
• Threaded mounting with an 18.000 thread diameter
• NTK part number 22129

Product Details

NTK 22129 is part of the Direct Fit Oxygen Sensor line, a product range focused on OE-style replacement coverage and application-specific fitment. NTK uses ceramic sensor manufacturing expertise and controlled production processes to deliver oxygen sensors with fit, form, and function aligned to original equipment requirements. This downstream oxygen sensor is listed for 2009-2013 Mazda 6 applications and is intended for B1S2 service positions. This part cross-references DENSO Auto Parts 234-4279 for the same application.

Common Issues This Sensor May Address

• Check engine light related to downstream oxygen sensor performance
• Fault codes tied to oxygen sensor response or signal irregularity
• Emissions inspection failures caused by a worn sensor
• Reduced exhaust monitoring accuracy in the Mazda 6 exhaust system
• Service replacement needs for a threaded, heated OE-style sensor

Installation Notes and Tips

Verify the downstream position before installation and confirm the connector and harness routing match the original sensor. The 4-wire heated design and threaded mounting should be checked against the vehicle’s existing configuration. For 2009-2013 Mazda 6 oxygen sensor replacement, compare the original part number and sensor location to ensure correct application before installation.

Quality Assurance

NTK is a major original equipment oxygen sensor manufacturer with extensive manufacturing test procedures to help ensure quality and reliability that meet or exceed OE specifications. The brand’s OE-focused engineering and application coverage make NTK 22129 a technical replacement choice for Mazda 6 downstream oxygen sensor service.