NTK 24781 Air / Fuel Ratio Sensor - Upstream Left or Upstream Right
OE Quality 60-Day Returns
NTK
 Direct Fit 4-Wire A/F Sensor

NTK 24781 Air / Fuel Ratio Sensor - Upstream Left or Upstream Right

Brand NTK 24781
Position Upstream Right and Upstream Left
Wiring Harness Length 18.7500
Sensor Type Heated
Thread Length 0.38
Universal Or Specific Fit Specific
Wire Quantity 4
Thread Diameter 18.000
Mounting Bracket Included No
Product line Direct Fit 4-Wire A/F Sensor
Fits INFINITI · 4 vehicles

Direct-fit design. Specific-fit replacement built for OE-style installation and application matching.

Heated 4-wire sensor. Helps the sensor reach operating temperature quickly for stable feedback.

OE-tested quality. Manufactured and tested to meet or exceed original equipment specifications.

Cross-references 226933WY0A for the same application. See all 1.

$158.82Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.

Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $158.82
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Air / Fuel Ratio Sensor options

Direct-fit air/fuel ratio sensor

NTK 24781 is a specific-fit air/fuel ratio sensor for select Infiniti applications. It uses a heated 4-wire design and is built to match OE fit, form, and function for the listed vehicles.

Key features

  • Specific-fit replacement for select Infiniti air/fuel ratio sensor applications
  • Heated sensor design for faster operating response
  • 4-wire configuration for the listed OE-style application
  • 18 mm thread diameter with 0.38 thread length
  • 18.75-inch wiring harness length
  • NTK 24781 direct-fit sensor engineered to OE specifications

Detailed fitment and application

Compatible with 2013 Infiniti FX50, upstream left and upstream right, and 2014 Infiniti QX70, upstream left and upstream right. The NTK 24781 is part of NTK’s Direct Fit 4-Wire A/F Sensor line, which focuses on application-specific coverage and OE-style replacement geometry. This part cross-references Nissan 226933WY0A for the same application.

What this sensor helps address

  • Fault codes related to air/fuel ratio sensor performance
  • Incorrect fuel trim readings from a worn sensor
  • Slow sensor response during closed-loop operation
  • Driveability issues tied to inaccurate exhaust feedback

Installation notes and quality

Use the listed fitment and sensor position to confirm application before installation. The threaded design and specific-fit harness help support a direct replacement process on the listed Infiniti FX50 and QX70 applications. NTK tests these oxygen sensors during manufacturing to meet or exceed OE specifications, and the brand is known for original equipment sensor production.

Related reading

This part fits 4 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2014INFINITIQX705.0LV8Upstream RightCompatible with downstream oxygen sensor designed to meet OE specifications.; Direct Fit 4-Wire A/F Sensor
2014INFINITIQX705.0LV8Upstream LeftOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit 4-Wire A/F Sensor
2013INFINITIFX505.0LV8Upstream RightCompatible with downstream oxygen sensor designed to meet OE specifications.; Direct Fit 4-Wire A/F Sensor
2013INFINITIFX505.0LV8Upstream LeftOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit 4-Wire A/F Sensor
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
226933WY0A