NTK 25547 Oxygen Sensor - Upstream Left or Upstream Right

Direct Fit Oxygen Sensor Overview

The NTK 25547 is a direct fit heated oxygen sensor built for specific Ferrari applications. It uses a threaded mounting design and a 4-wire configuration to support accurate air/fuel ratio feedback in OE-style replacement service.

• Direct fit oxygen sensor for specific applications
• Heated sensor design for faster operating response
• 4-wire construction with threaded mounting
• 23.5-inch wiring harness length
• NTK 25547 for targeted emission control service

Fitment and Application

Compatible with Ferrari 456 M GT, 456 M GTA, 550 Maranello, 456 M, 456 GT, 456 GTA, F50, and F355 Berlinetta/F355 GTS applications listed below. Fits 2002-2004 Ferrari 456 M GT, upstream right; Fits 2002-2004 Ferrari 456 M GTA, upstream right; Fits 1997-2002 Ferrari 550 Maranello, upstream right; Fits 1999-2001 Ferrari 456 M, upstream right; Fits 1996-1998 Ferrari 456 GT, upstream right and upstream left; Fits 1997-1998 Ferrari 456 GTA, upstream right and upstream left; Fits 1995-1997 Ferrari F50, upstream right and upstream left; Fits 1995 Ferrari 456 GT, upstream right and upstream left; Fits 1994-1995 Ferrari F355 Berlinetta, upstream right and upstream left; Fits 1994-1995 Ferrari F355 GTS, upstream right and upstream left.

Detailed Description

NTK is part of the NGK family of products and focuses on oxygen sensor coverage for import and domestic vehicles. The 25547 is engineered as a specific-fit replacement with OE-style form and function, and it is manufactured and tested to meet or exceed OE specifications. This part cross-references BBB Industries 13309 and 13819 for the same application.

Common Replacement Issues

• Faulty oxygen sensor signal affecting fuel control
• Check engine light related to sensor performance
• Slow sensor response during closed-loop operation
• Incorrect air/fuel ratio feedback from a worn sensor

Installation Notes and Quality Assurance

Use the threaded mounting style and harness length to confirm application match before installation. Verify the vehicle’s upstream left or upstream right location against the fitment list and match the connector and wire count to the original sensor. NTK states these oxygen sensors are extensively tested during manufacturing to help ensure quality and reliability that meets or exceeds OE specifications.