NTK 25564 Oxygen Sensor

Direct Fit Oxygen Sensor for Mercedes-Benz

The NTK 25564 is a direct fit heated oxygen sensor built for specific Mercedes-Benz applications. It uses a threaded mounting design and a 4-wire configuration with a 24.7500 harness length for OE-style replacement on supported vehicles.

Key Features

• Direct fit oxygen sensor for specific applications
• Heated sensor design for faster operating response
• 4-wire configuration
• Threaded mounting type
• 24.7500 wiring harness length
• 18.000 thread diameter

Detailed Description

NTK 25564 is part of the Direct Fit Oxygen Sensor line, engineered for specific-fit replacement rather than universal adaptation. As an oxygen sensor for Mercedes-Benz models, it is built to match OE-style fit, form, and function while supporting accurate exhaust feedback in emissions control systems. NTK is known for oxygen sensor manufacturing and uses ceramic technology from raw material through finished product, with manufacturing tests that verify quality and reliability against OE specifications. This part cross-references Bosch (e.g., 13862, 15003) for the same application.

Compatible Mercedes-Benz coverage includes Fits 1996-1999 Mercedes-Benz S500, Downstream Left; Fits 1996-1999 Mercedes-Benz S420, Downstream Left; Fits 1997-2000 Mercedes-Benz C230, Downstream; and Fits 1998-2000 Mercedes-Benz E320, Upstream Left or Upstream Right. Additional coverage includes Fits 1998-2000 Mercedes-Benz E430, Upstream Left or Upstream Right, plus Fits 1999-2002 Mercedes-Benz SL500, Downstream Left or Downstream Right. The NTK 25564 also fits select Mercedes-Benz E55 AMG, CL500, C280, C36 AMG, and E420 applications listed in the fitment data.

Common Issues This Part May Address

• Faulty oxygen sensor signal in the exhaust system
• Check engine light related to sensor performance
• Incorrect air-fuel feedback to the engine control system
• Emissions test failures caused by sensor degradation
• Slow sensor response from a worn heated oxygen sensor

Installation Notes and Tips

Verify the exact year, model, position, and notes before ordering. This part uses a threaded mounting type and a specific-fit design, so confirm harness length, wire count, and sensor placement against the vehicle application. Follow the vehicle service procedure for removal and installation, and inspect the connector and exhaust threads before installation.

Quality Assurance

NTK manufactures oxygen sensors with OE-specification testing and application coverage developed for import and domestic vehicles. The 25564 is backed by NTK's focus on fit, form, and function for direct replacement use.