NTK 24639 Oxygen Sensor - Downstream Left

Direct Fit Oxygen Sensor for OE Replacement

NTK Oxygen Sensor 24639 is a direct-fit, heated oxygen sensor built for specific applications on the 2001 Infiniti QX4 and 2001 Nissan Pathfinder. With OE-equivalent design and a threaded mounting style, it supports accurate exhaust feedback for the downstream left position.

As part of NTK’s Direct Fit Oxygen Sensor line, this sensor is built for straightforward replacement on import and domestic vehicles. NTK applies ceramic manufacturing expertise and extensive production testing to deliver fit, form, and function that align with OE specifications.

Key Features

• Direct-fit oxygen sensor for specific vehicle applications
• Heated sensor design for faster operating response
• 4-wire configuration for the listed OE-style application
• 48-inch wiring harness length
• 18 mm thread diameter with threaded mounting type
• OE-equivalent design for 2001 Infiniti QX4 and 2001 Nissan Pathfinder

Product Details

NTK 24639 is an emission control oxygen sensor engineered for the downstream left B2S2 position on the 2001 Infiniti QX4 and 2001 Nissan Pathfinder, with fitment limited to vehicles built to 8/1/00. This direct fit oxygen sensor is designed to match the original sensor layout and electrical configuration, helping maintain proper exhaust monitoring in the vehicle’s emissions system. This part cross-references Bosch 15445 for the same application.

What It Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect exhaust feedback from a worn downstream sensor
• Emissions system faults tied to sensor response or wiring issues
• Rough running caused by inaccurate air-fuel monitoring signals
• Replacement needs for a damaged or aging OE-style sensor

Installation Notes

Verify the vehicle build date before ordering, since this part applies to 2001 model-year vehicles built to 8/1/00. Confirm the downstream left B2S2 location, thread size, wire count, and harness length before installation. Use the vehicle’s original routing and connector layout to ensure proper placement on the Infiniti QX4 or Nissan Pathfinder.

Quality Assurance

NTK manufactures oxygen sensors with OE application coverage and production testing to help ensure quality and reliability that meet or exceed original equipment specifications. The NTK Direct Fit Oxygen Sensor line is supported by the brand’s role as a major OE sensor supplier.