NTK 25594 Oxygen Sensor - Upstream Right

Direct Fit Oxygen Sensor

The NTK 25594 is a direct fit heated oxygen sensor built for specific import applications. It uses a threaded mounting design and a 4-wire configuration with a 26-inch harness for OE-style replacement service.

Key Features

• Heated oxygen sensor for precise air-fuel feedback.
• Specific-fit design for direct replacement service.
• 4-wire construction with a 26-inch wiring harness.
• Threaded mounting with an 18 mm thread diameter.
• NTK 25594 is part of the Direct Fit Oxygen Sensor line.

Detailed Description

NTK 25594 is engineered for specific applications where accurate exhaust oxygen monitoring is required. As part of NTK's Direct Fit Oxygen Sensor line, it is built to match OE-style fit, form, and function while simplifying replacement on vehicles that use a threaded, heated sensor design. This part number 25594 is listed for Mercedes-Benz C280, C43 AMG, CLK320, and CLK430 applications in upstream right positions, including Bank 1 Sensor 1 notes where specified. NTK 25594 is also cross-referenced to Bosch 15090 and DENSO Auto Parts 234-4173 for the same application.

What It Helps Address

• Faulty oxygen sensor readings that can trigger engine management concerns.
• Air-fuel ratio feedback issues affecting drivability.
• Emissions monitoring problems caused by a worn sensor element.
• Replacement needs for a threaded, heated sensor with a specific harness length.

Installation Notes and Tips

Verify the connector, thread diameter, wire count, and harness length before installation. Confirm the listed position and application notes for the exact vehicle match. Use the fitment data for Mercedes-Benz C280, C43 AMG, CLK320, and CLK430 to confirm the correct upstream right application before ordering.

Quality Assurance

NTK states that its oxygen sensors are extensively tested during manufacturing and built to meet or exceed OE specifications. The brand is part of the NGK family and is recognized as a major original equipment oxygen sensor supplier.