NTK 24339 Air / Fuel Ratio Sensor - Upstream Left or Upstream Right

Direct-Fit Air/Fuel Ratio Sensor

NTK 24339 is a specific-fit heated air/fuel ratio sensor for Porsche applications that require OE-style sensor performance and connector fitment. It is built for direct replacement use where accurate upstream mixture feedback is critical.

Key Features

• Specific-fit design for direct replacement applications
• Heated sensor construction for faster operating response
• 5-wire configuration for air/fuel ratio monitoring
• 18 mm thread diameter with 0.38 thread length
• 57.0 wiring harness length for application-specific routing
• NTK 24339 is engineered to match OE fit, form, and function

Detailed Description

NTK 24339 is a direct-fit air/fuel ratio sensor from NTK’s Direct Fit 5-Wire A/F Sensor line. As part of NTK’s OE-focused sensor range, it is manufactured with ceramic expertise and tested during production to meet or exceed OE specifications. This sensor is used in Porsche upstream applications where precise exhaust feedback supports engine management calibration and emissions control. The part number 24339 is referenced for multiple Porsche fitments, including Porsche Panamera, Porsche Cayenne, Porsche 911, Porsche Boxster, and Porsche Cayman applications.

This part cross-references Bosch (e.g., 17154, 17156) for the same application.

What It Is Used For

• Replacing a worn or slow-responding upstream air/fuel ratio sensor
• Addressing mixture feedback faults that trigger check engine lights
• Restoring proper sensor response for emissions system monitoring
• Correcting drivability issues tied to inaccurate exhaust oxygen feedback
• Supporting OE-style sensor communication in Porsche engine management systems

Installation Notes and Tips

Verify the connector, wire count, thread size, and harness length before installation. Fitment includes Porsche upstream right and upstream left applications, so confirm the exact bank and sensor location for your vehicle. The sensor is specific fit, and the mounting bracket is not included. Use the vehicle’s service information to confirm the correct application for part number 24339 before installation.

Quality Assurance

NTK is a major OE oxygen sensor supplier with extensive manufacturing and testing controls. This sensor is produced to meet or exceed OE specifications for fit, form, and function.