NTK 24543 Oxygen Sensor - Downstream Left

Direct Fit Oxygen Sensor for Nissan and INFINITI

NTK Oxygen Sensor 24543 is a direct fit, heated oxygen sensor built for specific downstream left applications. It is engineered for 1996-2000 Nissan Pathfinder and 1997-2000 INFINITI QX4 models with B2S2 placement, making it a precise replacement for the original sensor location.

Key Features

• Direct fit oxygen sensor for specific vehicle applications
• Heated sensor design for faster operating response
• 4-wire configuration with a 49.75 in. wiring harness
• 18 mm threaded mounting type
• Designed to OE specifications for fit, form, and function
• NTK part number 24543

Product Line Details

NTK Direct Fit Oxygen Sensors are part of NTK’s OE-focused sensor line for import and domestic vehicles. Built with ceramic technology and extensive manufacturing testing, this product line is designed to deliver consistent signal performance and reliable replacement coverage for modern emission control systems.

Detailed Description

NTK 24543 is a heated oxygen sensor for downstream left placement, matched to OE-style mounting and connector requirements for the listed Nissan Pathfinder and INFINITI QX4 applications. As an emission control sensor, it monitors exhaust oxygen content so the engine management system can maintain proper air-fuel control and catalyst monitoring. This part cross-references Bosch 13257 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Fault codes tied to downstream oxygen sensor readings
• Incorrect exhaust oxygen signal feedback
• Emissions test failures caused by a worn sensor
• Driveability issues linked to aging sensor response

Installation Notes and Tips

• Verify downstream left, B2S2 placement before installation.
• Confirm the 4-wire connector and 18 mm threaded mounting match the original sensor.
• Inspect the harness routing and length requirements before final fitment.
• Use the vehicle’s service information for proper sensor removal and torque procedures.

Quality Assurance

NTK manufactures oxygen sensors with OE-level application coverage and extensive production testing to help ensure reliable operation and consistent fitment. The sensor is built to meet or exceed OE specifications for the listed applications.