NTK 25611 Oxygen Sensor - Downstream Right

Product Overview

NTK 25611 is a direct-fit heated oxygen sensor built for specific Mercedes-Benz applications. It uses a threaded mounting design, a 4-wire configuration, and a 23.25-inch harness for a precise replacement setup.

Compatible with Mercedes-Benz CLK320, CLK430, and CLK55 AMG downstream right applications, this NTK oxygen sensor is engineered for OE-style fit, form, and function. Part number 25611 is backed by NTK’s focus on sensor technology and application coverage.

Key Features

• Direct Fit Oxygen Sensor for specific applications
• Heated sensor design for faster operating response
• 4-wire configuration with threaded mounting
• 23.25-inch wiring harness length
• 18 mm thread diameter
• NTK 25611 replacement sensor

Detailed Description

NTK 25611 is part of the Direct Fit Oxygen Sensor line, created for straightforward replacement in applications that require the correct connector, harness length, and threaded installation style. The heated design supports accurate exhaust monitoring once the sensor reaches operating temperature, while the specific-fit construction helps maintain original equipment-style integration. NTK 25611 is a practical choice for Mercedes-Benz CLK320, CLK430, and CLK55 AMG downstream right service needs where OE-equivalent fitment matters.

NTK is known for oxygen sensor manufacturing and uses ceramic-based sensor technology developed from raw material through finished product. The brand’s manufacturing process includes testing intended to verify quality and reliability against OE specifications. If you are replacing a worn sensor on a Mercedes-Benz CLK320 or CLK430, part number 25611 provides a direct-fit solution with the correct mounting and wiring layout.

What It Helps Solve

• Check engine light caused by a failing oxygen sensor
• Incorrect air-fuel ratio readings
• Slow sensor response after warm-up
• Exhaust emissions monitoring faults
• Connector or harness mismatch during replacement

Installation Notes

Fits 2003 Mercedes-Benz CLK320, downstream right. Fits 2001-2003 Mercedes-Benz CLK430, downstream right. Fits 2001-2002 Mercedes-Benz CLK320, downstream right. Fits 2001-2002 Mercedes-Benz CLK55 AMG, downstream right.

Confirm the downstream right location, thread diameter, wire count, and harness length before installation. Use the vehicle’s original sensor routing and connector layout to verify proper replacement. Part number 25611 should be matched to the listed fitment only.

Quality Assurance

NTK states that these oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications. The brand also positions itself as a major OE oxygen sensor supplier, which supports confidence in application accuracy and product consistency.