NTK 24746 Air / Fuel Ratio Sensor - Upstream

NTK Direct Fit A/F Sensor for Subaru

NTK Part Number 24746 is a direct fit, 4-wire air/fuel ratio sensor for upstream applications on select Subaru Legacy and Subaru Outback models. It uses a wide-band design to provide the ECU with a linear signal for precise fuel control, helping maintain proper combustion and lower emissions.

Key Features

• Direct fit, specific application sensor
• Wide-band air/fuel ratio sensor with heated design
• 4-wire configuration with rectangular female connector
• M18 x 1.5 thread size and 7/8 in. hex size
• OE equivalent design for upstream placement
• Black connector with blade terminals

Product Details

NTK Part Number 24746 is part of the Direct Fit 4-Wire A/F Sensor line, built for exact replacement service on vehicles that rely on a wide-band sensor for accurate air/fuel monitoring. NTK is known for OEM oxygen sensor manufacturing, and this sensor reflects that OE-focused approach with a specific-fit design for 2010-2012 Subaru Legacy and 2010-2012 Subaru Outback upstream locations. On Subaru Legacy and Subaru Outback applications, the sensor helps the engine control module continuously adjust the mixture based on a linear output signal rather than a simple rich-or-lean switch.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Issues This Sensor Can Address

• Check engine light related to air/fuel ratio sensor performance
• Rough idle caused by inaccurate upstream mixture feedback
• Reduced fuel economy from incorrect fuel trim control
• Emissions test failure tied to sensor response problems
• Delayed or unstable ECU fuel corrections on Subaru Legacy and Subaru Outback models

Installation Notes

Install in the upstream position only on the listed Subaru applications. Verify the M18 x 1.5 thread size, 4-wire connector style, and rectangular female plug before installation. Because this is a specific-fit sensor, compare the original connector and sensor layout to confirm proper match for your Subaru Legacy or Subaru Outback.

Quality Assurance

NTK supplies OEM oxygen sensor technology and uses in-house ceramic control from raw material through finished sensor production. That manufacturing focus supports consistent signal accuracy and OE-style replacement performance for the listed applications.