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Delphi ES20375 Oxygen Sensor - Rear or Rear Right
| Brand | Delphi ES20375 |
|---|---|
| Position | Rear and Rear Right |
| Sensor Type | Heated |
| Wire Quantity | 4 |
| Connector Shape | Square |
| Thread Size | 18 x 1.5 mm |
| Overall Length | 640.0 |
| Package Contents | Oxygen sensor, instruction sheet |
| Position(s) | Rear, rear right. for the position specific to your vehicle, refe |
| Fits | Mazda · 10 vehicles |
Heated sensor. Delivers faster operation for more responsive emissions monitoring.
Square connector. Provides a straightforward electrical connection for installation.
OE heritage. Built from 100 years of OE experience and supplier knowledge.
Cross-references Bosch 15426, Carlson 15252 and DENSO Auto Parts 234-4040 for the same application. See all 20.
Delphi ES20375 Oxygen Sensor Overview
The Delphi ES20375 is a heated oxygen sensor built for rear and rear right applications on select Mazda vehicles. It uses a 4-wire design, a square connector, and an 18 x 1.5 mm thread size to support accurate exhaust feedback in the emissions system.
Backed by Delphi’s OE heritage and decades of supplier experience, this oxygen sensor is built with application-specific engineering for Mazda 6 and Mazda 626 fitments.
Key Features
- Heated oxygen sensor for faster operating response
- 4-wire configuration for the listed emissions applications
- Square connector shape for direct-fit style replacement
- 18 x 1.5 mm thread size
- Overall length: 640.0
- Includes oxygen sensor and instruction sheet
- Fits rear and rear right positions, depending on vehicle application
Fitment Details
Compatible With select Mazda applications:
- Fits 2006-2008 Mazda 6, rear right.
- Fits 2003-2005 Mazda 6, rear.
- Fits 2005 Mazda 6, rear, without California Emission System.
- Fits 2001-2002 Mazda 626, rear right.
- Fits 2000 Mazda 626, rear right, with California Emission System.
This part cross-references Bosch 15426 and DENSO Auto Parts 234-4040 for the same application.
What This Sensor Helps Address
- Check engine light related to oxygen sensor performance
- Incorrect air-fuel ratio feedback from the exhaust stream
- Reduced emissions system efficiency
- Slow sensor response during closed-loop operation
- Fault codes tied to rear oxygen sensor readings
Installation Notes
Confirm the position on your vehicle before ordering, since this part is listed for rear and rear right locations. Verify connector shape, thread size, and overall length against the original sensor before installation. For Mazda 6 and Mazda 626 applications, match the vehicle’s emission configuration and refer to the application tab for position-specific fitment.
Quality Assurance
Delphi builds aftermarket parts using OE experience and knowledge developed through long-term supplier relationships with major automakers. That OE background is reflected in the design and application coverage of the ES20375 oxygen sensor.
| Year | Make | Model | Transmission | Position | Notes |
|---|---|---|---|---|---|
| 2008 | Mazda | 6 | — | Rear Right | — |
| 2007 | Mazda | 6 | — | Rear Right | — |
| 2006 | Mazda | 6 | — | Rear Right | — |
| 2005 | Mazda | 6 | Manual | Rear | — |
| 2005 | Mazda | 6 | Automatic | Rear | without California Emission System |
| 2004 | Mazda | 6 | — | Rear | — |
| 2003 | Mazda | 6 | — | Rear | — |
| 2002 | Mazda | 626 | — | Rear Right | — |
| 2001 | Mazda | 626 | — | Rear Right | — |
| 2000 | Mazda | 626 | — | Rear Right | with California Emission System |
| No rows match your filter. | |||||