NTK 24643 Oxygen Sensor - Downstream Left

Direct Fit Oxygen Sensor for Nissan and INFINITI

NTK Oxygen Sensor 24643 is a direct fit, heated oxygen sensor built for specific applications on the Nissan Pathfinder and INFINITI QX4. It is engineered to match OE placement, wiring, and threaded mounting requirements for downstream left service.

Key Features

• Direct fit oxygen sensor for specific applications
• Heated sensor design for faster operating response
• 4-wire configuration with a 47.75 in. wiring harness
• 18 mm threaded mounting type
• OE-equivalent design for downstream left placement
• Built by NTK, the Sensor Specialist and a major OE oxygen sensor supplier

Product Details

NTK Direct Fit Oxygen Sensor 24643 is part of the brand’s Direct Fit Oxygen Sensor line, created to streamline application coverage while maintaining OE-style fit, form, and function. NTK controls ceramic production from raw material through finished sensor, and each unit is extensively tested during manufacturing to meet or exceed OE specifications. This part cross-references Bosch 13651 for the same application. It is a strong match for drivers searching for a 2001-2003 Nissan Pathfinder downstream left oxygen sensor or a 2001-2003 INFINITI QX4 downstream left oxygen sensor.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn downstream sensor
• Reduced emissions control efficiency
• Fault codes tied to B2S2 sensor placement
• Driveability issues caused by aging exhaust sensor response

Installation Notes and Tips

Install in the downstream left position only where specified by the vehicle application. Verify connector routing, harness length, and threaded mounting before installation. For fitment, use the exact vehicle year and model: Fits 2002-2003 INFINITI QX4, Downstream Left; Fits 2002 Nissan Pathfinder, Downstream Left; Fits 2001 INFINITI QX4, Downstream Left; Fits 2001 Nissan Pathfinder, Downstream Left. Confirm the B2S2 placement and OE-equivalent design notes before replacing the sensor.

Quality Assurance

NTK manufactures oxygen sensors with OE-focused engineering and extensive production testing to support reliable performance and proper fit. The brand’s OE application expertise and ceramic sensor manufacturing background are central to this product line.