NTK 24399 Air / Fuel Ratio Sensor - Upstream

NTK Direct Fit A/F Sensor for Mitsubishi

NTK Part Number 24399 is a direct fit heated air/fuel ratio sensor built for specific Mitsubishi upstream applications. It uses a 5-wire configuration and OE-style fit, form, and function for accurate replacement on Mitsubishi Outlander Sport, RVR, Lancer, and Outlander models.

Key Features

• Direct Fit 5-Wire A/F Sensor for specific Mitsubishi applications
• Heated sensor design for faster operating temperature
• 5-wire construction with a 40.5 in. wiring harness length
• 18.000 mm thread diameter and 0.38 in. thread length
• Specific fit replacement for upstream sensor locations
• OE-style engineering from NTK, the Sensor Specialist

Product Details

NTK 24399 is part of the Direct Fit 5-Wire A/F Sensor line, created for applications that require a precise replacement sensor without modification. NTK is a major original equipment oxygen sensor supplier, and this sensor reflects that OE-focused approach with controlled ceramic manufacturing, extensive testing, and application-specific design. It is built for upstream use on Mitsubishi vehicles, including 2011-2013 Mitsubishi Outlander, 2012-2017 Mitsubishi Lancer, 2013 Mitsubishi Outlander Sport, 2013 Mitsubishi RVR, 2015-2018 Mitsubishi Outlander Sport, 2015-2018 Mitsubishi RVR, and 2019-2021 Mitsubishi Outlander Sport and RVR. This part cross-references DENSO Auto Parts 234-5051 for the same application.

What This Sensor Helps Address

• Check engine light related to air/fuel ratio sensor performance
• Incorrect upstream sensor readings affecting fuel control
• Rough idle or drivability issues tied to sensor signal problems
• Failed emissions inspection caused by a faulty sensor
• OE replacement needs on Mitsubishi Outlander Sport, RVR, Lancer, or Outlander

Installation Notes

Install this sensor in the upstream position only where listed in the fitment data. Verify the connector, thread size, and harness routing before installation. The sensor is specific fit, so it is not a universal replacement. No mounting bracket is included.

Quality Assurance

NTK manufactures oxygen and air/fuel ratio sensors with OE application coverage and testing that meets or exceeds original equipment specifications. The brand’s ceramics expertise and production controls support consistent sensor performance for import and domestic vehicle service.