NTK 25698 Air / Fuel Ratio Sensor - Upstream Left or Upstream Right

Direct-Fit Air/Fuel Ratio Sensor

NTK 25698 is a direct-fit, heated air/fuel ratio sensor built for specific import applications. It uses a 4-wire design and is engineered to match OE fit, form, and function for accurate exhaust feedback.

Compatible With Jaguar XF, Jaguar Super V8, Jaguar Vanden Plas, Jaguar XJ8, Jaguar XJR, Jaguar XK, Jaguar XKR, Jaguar S-Type, and Jaguar XK8 applications listed below. This NTK 25698 sensor is part of the Direct Fit 4-Wire A/F Sensor line, which focuses on application-specific replacement coverage.

Key Features

• Direct-fit replacement for specific air/fuel ratio sensor applications
• Heated sensor design for faster operating response
• 4-wire configuration for OE-style electrical connection
• 18 mm thread diameter with 0.38 thread length
• 12.8 wiring harness length for application-specific routing
• Mounting bracket not included

Detailed Description

NTK 25698 is an application-specific air/fuel ratio sensor for Jaguar models that require a direct-fit replacement. It is listed for upstream right and upstream left positions across the XF, Super V8, Vanden Plas, XJ8, XJR, XK, XKR, S-Type, and XK8, with fitment notes identifying OE-design and OE-specification applications. The heated 4-wire construction supports stable sensor operation, while the specific-fit design helps maintain the original sensor layout. If you are replacing a Jaguar XF, Jaguar XJ8, or Jaguar S-Type air/fuel ratio sensor, this part number provides a targeted replacement option.

NTK 25698 is also cross-referenced to Bosch 15375 and DENSO Auto Parts 234-9125 for the same application.

What It Is Used For

• Replacing a failed air/fuel ratio sensor that triggers drivability or emissions concerns
• Restoring exhaust feedback for fuel control calculations
• Addressing sensor response issues caused by age or contamination
• Replacing a direct-fit sensor on Jaguar applications with OE-style requirements
• Correcting fault codes related to upstream sensor performance

Installation Notes and Tips

Verify the listed position and fitment notes before installation. Confirm thread size, harness length, and connector style against the removed sensor to ensure proper routing and fit. Use the vehicle-specific service procedure for sensor removal and installation, and inspect the exhaust bung threads before installing the replacement.

Quality Assurance

NTK is part of the NGK family of products and is a major OE oxygen sensor supplier. This sensor is manufactured and tested to meet or exceed OE specifications for fit, form, and function.