NTK 23515 Oxygen Sensor - Downstream, Intermediate or Upstream

Direct-Fit Oxygen Sensor Overview

NTK 23515 is a direct-fit heated oxygen sensor built for specific applications with threaded mounting and a 4-wire design. It is engineered for accurate exhaust feedback and OE-style fitment across select Mitsubishi, Eagle, Dodge, and Plymouth applications.

Use this NTK oxygen sensor when you need a replacement that matches the original sensor style and connection layout. The 12.7500-inch wiring harness length and 18.000 thread diameter support a straightforward replacement on the listed applications, including Mitsubishi Eclipse and Mitsubishi Mirage coverage.

Key Features

• Direct-fit oxygen sensor for specific applications
• Heated sensor design for faster operating response
• 4-wire configuration with threaded mounting
• 12.7500-inch wiring harness length
• 18.000 thread diameter
• OE-equivalent design language appears in the listed fitments

Detailed Application Notes

NTK 23515 is part of NTK’s Direct Fit Oxygen Sensor line, which focuses on application-specific replacement sensors rather than universal coverage. NTK is known for oxygen sensor manufacturing and OE application support, and this part reflects that approach with specific fitment for upstream, intermediate, and downstream locations depending on the vehicle and emissions package. This part cross-references DENSO Auto Parts (e.g., 234-4638) for the same application.

Compatible With select Mitsubishi Eclipse, Mitsubishi Mirage, Mitsubishi Expo, Mitsubishi Expo LRV, Eagle Summit, Dodge Colt, Plymouth Colt, Mitsubishi Sigma, and Mitsubishi Galant applications listed below. The NTK 23515 part number is used for direct replacement searches and catalog matching, and it appears in OE-style replacement listings for these vehicles.

What It Helps Address

• Faulty oxygen sensor readings
• Check engine light concerns related to exhaust feedback
• Incorrect air-fuel ratio control
• Emissions inspection failures tied to sensor performance
• Slow sensor response from a worn heated oxygen sensor

Installation Notes

Match the listed position, emissions package, and sensor location before installation. Verify the connector style, thread diameter, and harness length against the original part to confirm proper routing and fit. The threaded mounting design supports replacement on the specified applications without altering the exhaust sensor location.

Quality Assurance

NTK states that its oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications. The brand also positions itself as a major original equipment oxygen sensor supplier, and the 23515 follows that OE-focused manufacturing approach.