NTK 25583 Oxygen Sensor - Upstream

Direct Fit Oxygen Sensor

The NTK 25583 is a direct fit heated oxygen sensor built for specific applications with threaded mounting and a 4-wire design. It is engineered for accurate air/fuel feedback and OE-style fit, form, and function.

Key Features

• Heated oxygen sensor for faster operating response.
• Specific-fit design for direct replacement applications.
• 4-wire configuration with a 45.75-inch wiring harness.
• 18 mm thread diameter and threaded mounting type.
• NTK 25583 is manufactured and tested to meet or exceed OE specifications.

Detailed Description

NTK 25583 is part of the Direct Fit Oxygen Sensor line, a product family focused on streamlined coverage and OE application technology. NTK, part of the NGK family of products, applies ceramic sensor expertise and manufacturing control from raw material through finished sensor construction. This oxygen sensor is designed for specific-fit replacement use and supports precise exhaust feedback where accurate mixture control is required. It is a strong match for Mercedes-Benz C230 oxygen sensor replacement needs, especially when the application calls for an upstream sensor with OE-style dimensions and connector layout. This part number, 25583, is also cross-referenced to Bosch 15083 for the same application.

What It Helps Address

• Check engine light concerns related to oxygen sensor performance.
• Incorrect air/fuel ratio feedback from a worn sensor.
• Slow sensor response during closed-loop operation.
• Fitment issues caused by using a universal sensor instead of a specific-fit part.

Installation Notes and Quality

Fits 1997-2000 Mercedes-Benz C230, upstream. Verify the threaded mounting style, 18 mm thread diameter, 4-wire layout, and harness length before installation. The sensor is intended for direct-fit replacement on the listed application, and part number 25583 should be matched to the vehicle’s OE configuration. NTK states these oxygen sensors are extensively tested during manufacturing to support quality and reliability that meets or exceeds OE specifications.