NTK 23559 Oxygen Sensor - Downstream or Upstream

Direct Fit Oxygen Sensor for Mitsubishi and Dodge

NTK Oxygen Sensor 23559 is a direct fit, heated oxygen sensor built for specific applications on Mitsubishi and Dodge vehicles. It uses a 4-wire, threaded design with a 15.7500 wiring harness length and 18.000 thread diameter for OE-style replacement on listed upstream and downstream positions.

Key Features

• Direct Fit Oxygen Sensor with specific-fit application coverage
• Heated sensor design for faster operating temperature response
• 4-wire configuration for the listed vehicle applications
• Threaded mounting type with 18.000 thread diameter
• 15.7500 wiring harness length for OE-style routing
• Fits 1991-1999 Mitsubishi Eclipse, Mitsubishi 3000GT, Mitsubishi Diamante, Dodge Stealth, and Dodge Colt applications listed below

Product Details

NTK 23559 is part of the Direct Fit Oxygen Sensor line, created for specific import and domestic applications where original-equipment style fit and function matter. NTK uses ceramic sensor manufacturing expertise and extensive production testing to support consistent signal performance and reliability to OE specifications. This oxygen sensor is listed for 1991-1995 Mitsubishi 3000GT, 1992-1993 Mitsubishi Diamante, 1995-1999 Mitsubishi Eclipse, 1991-1995 Dodge Stealth, and 1993 Dodge Colt applications in the positions shown below. This part cross-references DENSO Auto Parts (e.g., 234-4027, 234-4642) for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings
• Slow sensor response during closed-loop operation
• Emissions test failures tied to sensor output
• Rough idle or drivability issues linked to faulty exhaust feedback

Installation Notes and Fitment

• Fits 1995-1999 Mitsubishi Eclipse, downstream
• Fits 1994-1995 Dodge Stealth, upstream
• Fits 1994-1995 Mitsubishi 3000GT, upstream
• Fits 1993 Dodge Colt, downstream
• Fits 1993 Dodge Stealth, upstream
• Fits 1993 Mitsubishi 3000GT, upstream
• Fits 1992-1993 Mitsubishi Diamante, upstream
• Fits 1991-1992 Dodge Stealth, upstream
• Fits 1991-1992 Mitsubishi 3000GT, upstream

Confirm the vehicle’s emissions configuration and sensor position before ordering. Match the connector routing, threaded mounting point, and harness length to the original sensor location for proper installation on Mitsubishi Eclipse, Mitsubishi 3000GT, and Dodge Stealth applications.

Quality Assurance

NTK is a major original-equipment oxygen sensor manufacturer and uses controlled ceramic technology plus manufacturing tests to help ensure the sensor meets OE-level fit, form, and function expectations.