Delphi ES20069 Oxygen Sensor - Rear, Rear Left or Rear Right

Delphi ES20069 Oxygen Sensor Overview

Delphi ES20069 is a heated oxygen sensor built for rear sensor locations on select Mazda applications. It uses a 4-wire design, square connector shape, and 18 x 1.5 mm thread size for a direct-fit style replacement where the vehicle application matches.

Built from Delphi’s OE heritage and supplier experience, this oxygen sensor reflects the same engineering knowledge used in aftermarket replacement parts for Mazda Millenia, Mazda 626, and Mazda MX-6 rear sensor positions.

Key Features

• Heated oxygen sensor for rear sensor placement
• 4-wire configuration
• Square connector shape
• 18 x 1.5 mm thread size
• Overall length: 680.0
• Package contents: oxygen sensor and instruction sheet
• Position-specific fitment for rear, rear left, and rear right applications

Detailed Description

The Delphi ES20069 oxygen sensor is engineered for vehicles that require a heated rear O2 sensor with the listed connector and thread specifications. It is a strong match for drivers searching for a rear oxygen sensor for Mazda Millenia, Mazda 626, or Mazda MX-6, especially when replacing a worn sensor that can affect emissions monitoring and engine management feedback. This part number, ES20069, also appears in cross-reference listings for several OE-style replacement applications.

This part cross-references Bosch (e.g., 13574, 15330) for the same application.

Vehicle Fitment

• Fits 1995-2002 Mazda Millenia, rear left.
• Fits 1995-1996 Mazda Millenia, rear right.
• Fits 1997-1999 Mazda 626, rear.
• Fits 1998-2000 Mazda 626, rear, without California Emission System.
• Fits 1997 Mazda MX-6, rear.

Common Replacement Reasons

• Check engine light related to rear oxygen sensor performance
• Failed emissions test caused by aging sensor response
• Rough idle or drivability issues tied to incorrect exhaust feedback
• Fuel trim concerns from inaccurate oxygen readings
• Corrosion or connector damage at the rear sensor location

Installation Notes and Tips

Confirm the exact rear sensor position on your vehicle before ordering, since ES20069 is listed for rear left, rear right, and rear positions depending on application. Verify connector shape, wire count, and thread size against the original sensor, and check the application notes for Mazda 626 models with and without California Emission System coverage. Use the vehicle’s application tab or service information to match the correct location.

Quality Assurance

Delphi draws on more than a century of OE experience and supplier knowledge used by major automakers, with that engineering background carried into its aftermarket replacement parts.