Delphi ES20179 Oxygen Sensor - Front, Left or Rear

Delphi ES20179 Oxygen Sensor Overview

Delphi ES20179 is a heated oxygen sensor built for emission control service on select Mazda applications. It uses a 4-wire design with a square connector and 18 x 1.5 mm thread size, making it a direct-fit replacement for the specified front, left, and rear positions listed below.

Backed by Delphi’s OE heritage and decades of supplier experience with major automakers, this oxygen sensor is built with the application details needed for accurate exhaust feedback and emissions system operation. Compatible With 1992-1994 Mazda MX-3, left; 1999-2000 Mazda Protege, front; and 2000-2001 Mazda MPV, rear without California Emission System.

Key Features

• Heated oxygen sensor for faster operating response
• 4-wire configuration for the listed vehicle applications
• Square connector shape for OE-style fitment
• 18 x 1.5 mm thread size
• Overall length: 275.0
• Package includes oxygen sensor and instruction sheet
• Position-specific coverage for front, left, and rear locations

Detailed Description

Delphi ES20179 is engineered for emission control service where accurate exhaust oxygen monitoring is required. The heated sensor design helps the engine management system receive operating data more quickly after startup, while the OE-based construction reflects Delphi’s long history supplying original equipment to global automakers. This part number, ES20179, is listed for select Mazda MX-3, Mazda Protege, and Mazda MPV applications, including 2000-2001 Mazda MPV rear fitment without California Emission System.

This part cross-references DENSO Auto Parts 234-4143 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings
• Reduced emissions system efficiency
• Slow sensor response after cold start
• Fault codes tied to front, left, or rear sensor positions

Installation Notes and Tips

Verify the exact position before ordering, since this sensor is listed for front, left, and rear locations depending on vehicle application. Confirm the connector shape, thread size, and emission package details against the vehicle’s original sensor before installation. For the 2000-2001 Mazda MPV, this listing applies to rear position vehicles without California Emission System. Use the application tab or vehicle service information to match the correct location for your Mazda MX-3, Mazda Protege, or Mazda MPV.

Quality Assurance

Delphi builds this oxygen sensor using OE experience and application knowledge developed through years of supplying original equipment to major automakers. The ES20179 is designed to meet the fitment and functional requirements of the listed Mazda applications.