NTK 25617 Oxygen Sensor

Direct Fit Oxygen Sensor for Mercedes-Benz and Chrysler

NTK 25617 is a direct fit heated oxygen sensor built for specific applications across Mercedes-Benz, Maybach, and Chrysler Crossfire models. It is engineered with OE-style fit, form, and function to support accurate exhaust feedback and reliable sensor replacement.

Key Features

• Heated oxygen sensor with a specific-fit design
• 4-wire configuration for OE-style signal and heater circuit operation
• Threaded mounting with 18 mm thread diameter
• 18.5-inch wiring harness length for application-specific routing
• Manufactured and tested to meet or exceed OE specifications
• Direct replacement for many upstream and downstream positions

Product Line Details

NTK Direct Fit Oxygen Sensors are part of NTK’s OE-focused sensor line. As part of the NGK family of products, NTK applies ceramic manufacturing expertise and production testing to deliver a replacement sensor designed for proper fitment and dependable operation in import and domestic emission control systems.

Detailed Description

NTK part number 25617 is designed for vehicles that require a direct fit oxygen sensor with threaded mounting and heated operation. It is listed across a wide range of Mercedes-Benz applications, including CL600, S600, SL600, E350, E550, and G55 AMG models, as well as Chrysler Crossfire and Maybach 57/62 coverage. Depending on the vehicle, this sensor is used in upstream right, upstream left, downstream right, downstream left, upstream, or downstream positions. This part cross-references Bosch 16123 and DENSO Auto Parts 234-4883 for the same application.

Common Problems This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn sensor
• Reduced fuel control caused by slow sensor response
• Emissions test failure tied to exhaust monitoring faults
• Driveability issues linked to degraded exhaust feedback

Installation Notes and Fitment Tips

Verify the exact year, model, and sensor position before ordering. Fits 2001-2014 Mercedes-Benz CL600, upstream right; Fits 2001-2014 Mercedes-Benz CL600, upstream left; Fits 2001-2014 Mercedes-Benz CL600, downstream right; Fits 2001-2014 Mercedes-Benz CL600, downstream left. Fits 2004-2008 Chrysler Crossfire, upstream right; Fits 2004-2008 Chrysler Crossfire, upstream left; Fits 2004-2008 Chrysler Crossfire, downstream right; Fits 2004-2008 Chrysler Crossfire, downstream left. Fits 2003-2012 Maybach 57, downstream right; Fits 2003-2012 Maybach 57, downstream left; Fits 2003-2012 Maybach 62, downstream right; Fits 2003-2012 Maybach 62, downstream left. Confirm connector routing, harness length, and threaded sensor location against the original unit before installation.

Quality Assurance

NTK is a major original equipment oxygen sensor manufacturer with extensive manufacturing tests performed to help ensure quality and reliability that meet or exceed OE specifications. The 25617 is built as a direct fit replacement for consistent performance in emission control service.