Delphi ES20077 Oxygen Sensor - Center, Front or Rear

Delphi ES20077 Oxygen Sensor Overview

The Delphi ES20077 is a heated oxygen sensor built for precise exhaust monitoring in select Mitsubishi and Dodge applications. It uses a 4-wire design with a square connector and 18 x 1.5 mm thread size for direct-fit replacement where specified.

Backed by Delphi’s OE heritage and decades of supplier experience, this oxygen sensor is engineered with the same application knowledge that supports original equipment development. It is a practical choice for restoring accurate air-fuel feedback on compatible Mitsubishi Eclipse, Mirage, Expo, Mighty Max, and related models.

Key Features

• Heated oxygen sensor for faster operating temperature and signal response
• 4-wire configuration
• Square connector shape
• 18 x 1.5 mm thread size
• Overall length: 325.0
• Package contents: oxygen sensor and instruction sheet
• Position coverage includes center, front, and rear depending on vehicle application

Detailed Description

Delphi ES20077 is an emission control oxygen sensor designed for vehicles that require a heated, 4-wire sensor with a square connector. Its OE-based design approach reflects Delphi’s long history supplying original equipment to major automakers, helping ensure the sensor matches the fit and function expected in the application. This part number, ES20077, is listed for multiple Mitsubishi and Dodge models, including 1996-1997 Mitsubishi Eclipse front, 1994-1996 Mitsubishi Mirage front, and 1993-1994 Dodge Colt rear with California Emission System.

This part cross-references DENSO Auto Parts 234-4638 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings
• Reduced fuel control from a slow or aging sensor
• Emission test failures tied to sensor output
• Driveability issues caused by inaccurate exhaust feedback

Installation Notes and Tips

• Verify the exact position before ordering; this sensor is listed for front, rear, center, and N/A positions depending on the vehicle.
• Confirm thread size, connector shape, and wire count against the original sensor before installation.
• Use the application tab to match the correct Mitsubishi Eclipse, Mirage, Expo, Mighty Max, Colt, Ram 50, Expo LRV, Sigma, or Galant fitment.
• Inspect the harness routing and connector condition before final installation.

Quality Assurance

Delphi builds on more than 100 years of OE experience, with engineering knowledge drawn from supplying the world’s top automakers. That OE heritage is reflected in the design and application coverage of the ES20077 oxygen sensor.