Delphi ES20078 Oxygen Sensor - Left, Rear or Right

Delphi ES20078 Oxygen Sensor Overview

The Delphi ES20078 is a heated oxygen sensor built for precise exhaust feedback in select Mitsubishi and Dodge applications. It uses OE-based engineering from a supplier with long-standing original equipment experience, helping support accurate air-fuel control and emissions monitoring.

• Heated oxygen sensor for faster operating temperature
• 4-wire design with square connector shape
• Thread size: 18 x 1.5 mm
• Overall length: 385.0
• Package contents: oxygen sensor and instruction sheet
• Position-specific coverage for front, left, and rear locations depending on vehicle application

Fitment and Application Details

Compatible with 1991-1993 Mitsubishi 3000GT, 1992-1993 Mitsubishi Diamante, 1995-1998 Mitsubishi Eclipse, and select Dodge Stealth applications. This part also fits 1999 Mitsubishi Eclipse, rear, with all wheel drive, plus 1991-1995 Dodge Stealth and 1994-1995 Mitsubishi 3000GT applications listed for the correct position and emissions configuration.

This part cross-references DENSO Auto Parts (e.g., 234-4027, 234-4642) for the same application.

Key Features

• Delphi ES20078 oxygen sensor for emissions control service
• Heated sensor design supports quicker closed-loop operation
• Square connector and 4-wire layout for direct-style replacement
• OE heritage and application knowledge built into the aftermarket part
• Position coverage includes front, left, and rear locations where listed

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings
• Slow sensor response during warm-up
• Emissions test failures tied to sensor output
• Rough idle or drivability issues caused by faulty exhaust feedback

Installation Notes and Tips

Verify the exact position on your vehicle before ordering, since this sensor is listed for front, left, and rear applications depending on model and configuration. Confirm thread size, connector shape, wire count, and overall length against the original sensor before installation. Use the application tab and vehicle-specific fitment details to match the correct location on Mitsubishi Eclipse, Mitsubishi 3000GT, Mitsubishi Diamante, or Dodge Stealth models.

Quality Assurance

Delphi draws on more than 100 years of OE experience and original equipment knowledge when producing aftermarket parts. That OE-based background supports consistent fitment and sensor design for the listed applications.