NTK 25666 Oxygen Sensor - Upstream

Direct Fit Oxygen Sensor for Suzuki Verona

The NTK 25666 is a direct fit heated oxygen sensor built for specific applications on the 2004-2005 Suzuki Verona. It is engineered for upstream placement and uses a threaded mounting design with a 4-wire configuration for OE-style replacement.

Key Features

• Direct fit oxygen sensor for specific vehicle applications
• Heated sensor design for faster operating response
• 4-wire construction with 15.7500 wiring harness length
• 18.000 thread diameter and threaded mounting type
• OE-style replacement for upstream sensor locations
• Part number 25666 for easy identification

Product Details

NTK Direct Fit Oxygen Sensor 25666 is part of the NTK Sensor Specialist line, focused on import and domestic emission control coverage. NTK applies ceramic manufacturing expertise and OE application knowledge to produce oxygen sensors with fit, form, and function aligned to original equipment requirements. This sensor is a specific-fit replacement for the 2004-2005 Suzuki Verona, including upstream applications for Cylinders 1-3, Bank 1 Sensor 1, and Cylinders 4-6, Bank 2 Sensor 1. If you are replacing a Suzuki Verona upstream oxygen sensor, NTK 25666 provides a direct-fit solution built for the listed OE application.

This part cross-references Bosch 15148 and DENSO Auto Parts 234-4422 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn upstream sensor
• Slow sensor response affecting fuel control feedback
• Emission test failures tied to sensor degradation
• Rough idle or drivability issues linked to faulty exhaust feedback

Installation Notes and Tips

Verify the vehicle year, engine bank, and sensor position before installation. This NTK 25666 oxygen sensor uses a threaded mounting style and a 4-wire harness, so connector routing and harness length should be checked against the original part. For 2004-2005 Suzuki Verona upstream replacement, confirm whether the application is Cylinders 1-3, Bank 1 Sensor 1 or Cylinders 4-6, Bank 2 Sensor 1.

Quality Assurance

NTK manufactures oxygen sensors with extensive testing during production to help ensure quality and reliability that meet or exceed OE specifications. As the original equipment manufacturer for many oxygen sensor applications, NTK supports OE-level replacement coverage for import and domestic vehicles.