NTK 25568 Oxygen Sensor

Direct-Fit Oxygen Sensor

NTK Oxygen Sensor 25568 is a specific-fit, heated oxygen sensor built for Mercedes-Benz applications that require direct replacement coverage. It uses a threaded mounting design and a 4-wire configuration with a 19-inch harness for OE-style serviceability.

As part of NTK’s Direct Fit Oxygen Sensor line, this sensor is engineered for streamlined coverage and OE application support. NTK 25568 is a practical choice for Mercedes-Benz E320, S500, and CL500 service where accurate air/fuel feedback and original-equipment-style fit are required.

Key Features

• Heated oxygen sensor for faster operating response
• Specific-fit design for direct replacement applications
• 4-wire construction for signal and heater circuit operation
• 19-inch wiring harness length
• Threaded mounting type with 18 mm thread diameter

Detailed Description

NTK 25568 is a direct-fit oxygen sensor designed around OE-style dimensions and application coverage. The heated sensor design helps maintain consistent exhaust feedback once the system reaches operating temperature, while the threaded mount and specific-fit configuration support straightforward replacement on covered Mercedes-Benz models. This part number is used across multiple upstream and downstream positions depending on the vehicle application, including Mercedes-Benz E320, S420, and S600 listings.

NTK is known for oxygen sensor manufacturing and OE-level application support, and this part reflects that focus with tested construction and fitment-specific coverage. If you are replacing a worn sensor on a Mercedes-Benz SL500, E55 AMG, or S430, NTK 25568 provides a direct-fit option built to match the original sensor layout. This part cross-references Bosch 13582 and DENSO Auto Parts 234-4174 for the same application.

What It Helps Solve

• Check engine light caused by oxygen sensor failure
• Slow or inaccurate air/fuel ratio feedback
• Rough idle or drivability issues related to sensor aging
• Emissions test failures tied to faulty exhaust monitoring
• Replacement needs for threaded, heated sensor applications

Installation Notes and Tips

Verify the exact position, chassis breakpoints, and notes before ordering, since NTK 25568 is used in multiple Mercedes-Benz upstream and downstream locations. Confirm the connector style, harness length, and thread size against the original sensor before installation. Use the vehicle-specific fitment notes for Mercedes-Benz CL500, S320, and E55 AMG applications to match the correct sensor location.

Quality Assurance

NTK states that these oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications. The brand’s OE manufacturing background and direct-fit product strategy support consistent fit, form, and function across covered applications.