NTK 25731 Air / Fuel Ratio Sensor - Upstream Left or Upstream Right
OE Quality 60-Day Returns
NTK
 Direct Fit 4-Wire A/F Sensor

NTK 25731 Air / Fuel Ratio Sensor - Upstream Left or Upstream Right

Brand NTK 25731
Position Upstream Right and Upstream Left
Wiring Harness Length 10.8
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 Land Rover · 22 vehicles

Direct-fit design. Matches the original sensor layout for specific-fit replacement service.

Heated sensor. Helps the sensor reach operating temperature quickly for stable signal output.

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

Cross-references AP Exhaust 18121, DENSO Auto Parts 234-9095 and LR011710 for the same application. See all 3.

$130.05Free 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 $130.05
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 Sensor

NTK 25731 is a specific-fit, heated air/fuel ratio sensor built for OE-style replacement on select Land Rover applications. It uses a 4-wire design and a direct-fit layout to match the original sensor configuration without universal adaptation.

Key Features

  • Direct Fit 4-Wire A/F Sensor for specific applications
  • Heated sensor design for faster operating response
  • 10.8-inch wiring harness length for OE-style routing
  • 18.0 mm thread diameter with 0.38 thread length
  • NTK 25731 is tested during manufacturing for quality and reliability

Detailed Description

NTK 25731 is part of the Direct Fit 4-Wire A/F Sensor line, a product line focused on application-specific oxygen and air/fuel ratio sensors. NTK uses ceramic manufacturing expertise and OE application technology to deliver a sensor with the fit, form, and function expected for replacement service. This part cross-references DENSO Auto Parts 234-9095 for the same application.

Compatible With 2010-2013 Land Rover LR4, upstream right; 2010-2013 Land Rover LR4, upstream left; 2010-2013 Land Rover Range Rover Sport, upstream right; 2010-2013 Land Rover Range Rover Sport, upstream left; 2010-2012 Land Rover Range Rover, upstream right; 2010-2012 Land Rover Range Rover, upstream left. Use NTK 25731 when replacing a heated, specific-fit sensor that matches the original thread and harness dimensions on these vehicles.

What It Helps Address

  • Fault codes related to air/fuel ratio sensor performance
  • Rough idle or drivability issues tied to sensor signal errors
  • Incorrect fuel mixture readings from a worn sensor
  • Slow sensor response during closed-loop operation
  • Replacement needs for a damaged or aging OE-style sensor

Installation Notes and Quality

Verify connector style, thread size, and harness length before installation. Confirm the listed position and application details for the vehicle, including Land Rover LR4, Range Rover Sport, and Range Rover coverage. Mounting bracket is not included. NTK states that these sensors are extensively tested during manufacturing and are built to meet or exceed OE specifications.

Related reading

This part fits 22 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2013Land RoverLR45.0LV8Upstream RightOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit 4-Wire A/F Sensor
2013Land RoverLR45.0LV8Upstream LeftCompatible with downstream oxygen sensor designed to meet OE specifications.; Direct Fit 4-Wire A/F Sensor
2013Land RoverRange Rover Sport5.0LV8Upstream RightOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit 4-Wire A/F Sensor
2013Land RoverRange Rover Sport5.0LV8Upstream LeftCompatible with downstream oxygen sensor designed to meet OE specifications.; Direct Fit 4-Wire A/F Sensor
2012Land RoverLR45.0LV8Upstream RightOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit 4-Wire A/F Sensor
2012Land RoverLR45.0LV8Upstream LeftCompatible with downstream oxygen sensor designed to meet OE specifications.; Direct Fit 4-Wire A/F Sensor
2012Land RoverRange Rover5.0LV8Upstream RightOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit 4-Wire A/F Sensor
2012Land RoverRange Rover5.0LV8Upstream LeftCompatible with downstream oxygen sensor designed to meet OE specifications.; Direct Fit 4-Wire A/F Sensor
2012Land RoverRange Rover Sport5.0LV8Upstream RightOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit 4-Wire A/F Sensor
2012Land RoverRange Rover Sport5.0LV8Upstream LeftCompatible with downstream oxygen sensor designed to meet OE specifications.; Direct Fit 4-Wire A/F Sensor
2011Land RoverLR45.0LV8Upstream RightOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit 4-Wire A/F Sensor
2011Land RoverLR45.0LV8Upstream LeftCompatible with downstream oxygen sensor designed to meet OE specifications.; Direct Fit 4-Wire A/F Sensor
2011Land RoverRange Rover5.0LV8Upstream RightOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit 4-Wire A/F Sensor
2011Land RoverRange Rover5.0LV8Upstream LeftCompatible with downstream oxygen sensor designed to meet OE specifications.; Direct Fit 4-Wire A/F Sensor
2011Land RoverRange Rover Sport5.0LV8Upstream RightOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit 4-Wire A/F Sensor
2011Land RoverRange Rover Sport5.0LV8Upstream LeftCompatible with downstream oxygen sensor designed to meet OE specifications.; Direct Fit 4-Wire A/F Sensor
2010Land RoverLR45.0LV8Upstream RightOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit 4-Wire A/F Sensor
2010Land RoverLR45.0LV8Upstream LeftCompatible with downstream oxygen sensor designed to meet OE specifications.; Direct Fit 4-Wire A/F Sensor
2010Land RoverRange Rover5.0LV8Upstream RightOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit 4-Wire A/F Sensor
2010Land RoverRange Rover5.0LV8Upstream LeftCompatible with downstream oxygen sensor designed to meet OE specifications.; Direct Fit 4-Wire A/F Sensor
2010Land RoverRange Rover Sport5.0LV8Upstream RightOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit 4-Wire A/F Sensor
2010Land RoverRange Rover Sport5.0LV8Upstream LeftCompatible with downstream oxygen sensor designed to meet OE specifications.; Direct Fit 4-Wire A/F Sensor
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
AP Exhaust — 18121DENSO Auto Parts — 234-9095LR011710