NTK 24401 Oxygen Sensor - Upstream Left or Upstream Right

Direct Fit Oxygen Sensor for Infiniti and Nissan

NTK Direct Fit Oxygen Sensor 24401 is a heated, threaded replacement oxygen sensor built for specific upstream applications. It is engineered for direct fitment on select Infiniti Q45, FX35, FX45, G35, and M45 models, as well as Nissan 350Z applications, with OE-style wiring and connector layout for a straightforward replacement.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for direct replacement on listed applications
• 4-wire configuration with a 21.0000 wiring harness length
• 18.000 thread diameter with threaded mounting type
• Built by NTK, a major original equipment oxygen sensor manufacturer
• Cross-references Bosch 15524 and DENSO Auto Parts 234-4308 for the same application

Product Line Details

NTK Direct Fit Oxygen Sensor products are part of the brand’s OE-focused sensor line for import and domestic vehicles. NTK uses controlled ceramic technology and manufacturing processes developed around oxygen sensor production, with coverage aimed at maintaining fit, form, and function for factory-style replacement needs. Part number 24401 follows that direct-fit approach for the listed Infiniti and Nissan applications.

Fitment

• Fits 2006 Infiniti Q45, Upstream Left; B1S1; To 12/05; OE MFR: NTK; Direct Fit Oxygen Sensor
• Fits 2003-2005 Infiniti FX45, Upstream Left; Bank 1 Sensor 1 Oxygen Sensor; Direct Fit Oxygen Sensor
• Fits 2002-2005 Infiniti Q45, Upstream Left; Bank 1 Sensor 1 Oxygen Sensor; Direct Fit Oxygen Sensor
• Fits 2004 Infiniti FX35, Upstream Right; B1S1; 2004 Model Year; OE MFR: NTK; Direct Fit Oxygen Sensor
• Fits 2004 Infiniti FX35, Upstream Left; B2S1; 2004 Model Year; OE MFR: NTK; Direct Fit Oxygen Sensor
• Fits 2003-2004 Infiniti G35, Upstream Right; Bank 1 Sensor 1 Oxygen Sensor; Direct Fit Oxygen Sensor
• Fits 2003-2004 Infiniti G35, Upstream Left; Bank 2, sensor 1, Oxygen Sensor.; Direct Fit Oxygen Sensor
• Fits 2003-2004 Infiniti M45, Upstream Left; Bank 1 Sensor 1 Oxygen Sensor; Direct Fit Oxygen Sensor
• Fits 2003-2004 Nissan 350Z, Upstream Right; Bank 1 Sensor 1 Oxygen Sensor; Direct Fit Oxygen Sensor
• Fits 2003-2004 Nissan 350Z, Upstream Left; Bank 2, sensor 1, Oxygen Sensor.; Direct Fit Oxygen Sensor
• Fits 2003 Infiniti FX35, Upstream Right; Bank 1 Sensor 1 Oxygen Sensor; Direct Fit Oxygen Sensor
• Fits 2003 Infiniti FX35, Upstream Left; Bank 2, sensor 1, Oxygen Sensor.; Direct Fit Oxygen Sensor

What It Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn upstream sensor
• Slow sensor response during closed-loop fuel control
• Rough idle or drivability issues tied to faulty exhaust feedback
• Emissions test failures caused by a degraded oxygen sensor

Installation Notes and Tips

Confirm the vehicle position before ordering, since this part is listed for upstream left and upstream right locations depending on application. Match the connector, thread diameter, and harness length to the original sensor on the vehicle. For 2003-2004 Infiniti G35 and Nissan 350Z applications, verify bank and sensor position carefully before installation.

Quality Assurance

NTK is a long-established oxygen sensor manufacturer and OE supplier, and this part is manufactured and tested to meet or exceed OE specifications for the listed applications. Part number 24401 is built for direct-fit replacement on the specified Infiniti and Nissan models.