Delphi ES20065 Oxygen Sensor - Front, Rear or Rear Right

Delphi ES20065 Oxygen Sensor Overview

Delphi ES20065 is a heated oxygen sensor built for emission control applications that require accurate exhaust feedback and OE-style fitment. With Delphi’s OE heritage and 100 years of supplier experience behind the design, this sensor is a direct replacement choice for select Mazda Miata, Mazda Millenia, Mazda Protege, and Kia Sephia applications.

Use Delphi ES20065 when you need a replacement oxygen sensor for front, rear, or rear right positions on the listed vehicles. It features a 4-wire layout, square connector shape, and 18 x 1.5 mm thread size for application-specific installation.

Key Features

• Heated oxygen sensor for emission control feedback
• 4-wire design for the listed vehicle applications
• Square connector shape
• 18 x 1.5 mm thread size
• Overall length: 810.0
• Package includes the oxygen sensor and instruction sheet
• Position coverage includes front, rear, and rear right, depending on vehicle application

Vehicle Fitment

• Fits 2001-2005 Mazda Miata, front.
• Fits 1995-2002 Mazda Millenia, rear right.
• Fits 1995-1998 Mazda Protege, rear.
• Fits 1996-1997 Kia Sephia, rear.

This part cross-references Bosch 13581 and DENSO Auto Parts 234-4612 for the same application.

Detailed Description

Delphi ES20065 is an OE-style heated oxygen sensor engineered for precise exhaust monitoring in select Mazda and Kia vehicles. It is a strong match for drivers searching for a 2001-2005 Mazda Miata front oxygen sensor, a 1995-2002 Mazda Millenia rear right oxygen sensor, or a 1995-1998 Mazda Protege rear oxygen sensor. The square connector, 4-wire configuration, and 18 x 1.5 mm thread size help support proper vehicle-specific replacement where the original sensor matches these specifications.

Delphi builds this sensor using OE knowledge developed through long-term supplier experience with major automakers, which helps align the replacement part with factory-style expectations for fit and function. The ES20065 part number is also a useful reference when comparing oxygen sensor options for Mazda Miata, Mazda Millenia, Mazda Protege, and Kia Sephia applications.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from a worn sensor
• Reduced emissions monitoring accuracy
• Slow or inconsistent sensor response
• Failed emissions inspection tied to sensor output

Installation Notes

Confirm the sensor position on your vehicle before ordering, since ES20065 is listed for front, rear, and rear right locations depending on application. Verify connector shape, wire count, and thread size against the original sensor before installation. For the correct position-specific application, refer to the vehicle fitment details for your Mazda Miata, Mazda Millenia, Mazda Protege, or Kia Sephia.

Quality Assurance

Delphi’s OE heritage and supplier background are built into this aftermarket oxygen sensor, supporting a replacement part that follows factory-style engineering expectations. The ES20065 is backed by Delphi’s manufacturing experience in emission control components.