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Delphi ES20100 Oxygen Sensor - Rear
| Brand | Delphi ES20100 |
|---|---|
| Position | Rear |
| Sensor Type | Heated |
| Wire Quantity | 4 |
| Connector Shape | Square |
| Thread Size | 18 x 1.5 mm |
| Overall Length | 445.0 |
| Package Contents | Oxygen sensor, instruction sheet |
| Fits | Mazda and Subaru · 11 vehicles |
OE heritage. Built with a century of original-equipment experience.
Heated sensor. Helps the sensor reach operating temperature quickly.
Square connector. Simplifies a clean, secure electrical connection.
Cross-references Bosch 15265, Bosch 15638 and DENSO Auto Parts 234-4043 for the same application. See all 22.
Delphi ES20100 Rear Oxygen Sensor
The Delphi ES20100 is a heated rear oxygen sensor built for precise exhaust monitoring on select Mazda 626 and Subaru applications. It combines Delphi’s OE heritage with the specifications needed for reliable replacement in emissions control service.
Key Features
- Heated oxygen sensor for faster operating temperature and stable signal output
- 4-wire design with a square connector shape
- 18 x 1.5 mm thread size for direct-fit installation on listed applications
- Overall length: 445.0
- Includes oxygen sensor and instruction sheet
- Rear position sensor for emissions system service
Detailed Description
Delphi ES20100 is an OE-style rear oxygen sensor engineered for vehicles that require accurate exhaust feedback after the catalytic converter. Delphi draws on more than a century of OE experience and supplier knowledge used by major automakers, bringing that background into this aftermarket replacement. This part cross-references Bosch 15265 and DENSO Auto Parts 234-4043 for the same application. It is a strong match for rear sensor service on 2001-2002 Mazda 626, 2000-2001 Subaru Impreza, 2000-2001 Subaru Legacy, and 2000-2001 Subaru Outback, including California-emissions listings where noted.
What It Helps Address
- Check engine light related to rear oxygen sensor performance
- Incorrect exhaust oxygen readings after the catalytic converter
- Emissions test failures tied to sensor response or signal quality
- Rough fuel control caused by a worn or slow-reacting sensor
- Diagnostic trouble codes associated with rear O2 sensor circuits
Installation Notes and Tips
Verify the rear sensor location, connector shape, wire count, and thread size before installation. Confirm the vehicle’s emissions configuration, especially on California-emissions applications, and compare the original sensor length and connector style to the Delphi ES20100. For best results, inspect the harness routing and exhaust threads before fitting the new sensor.
Quality Assurance
Delphi builds this replacement using OE-focused engineering informed by its long history as a supplier to major automakers. The ES20100 is intended to meet the fitment and functional requirements of the listed Mazda and Subaru rear oxygen sensor applications.
| Year | Make | Model | Transmission | Position | Notes |
|---|---|---|---|---|---|
| 2002 | Mazda | 626 | — | Rear | — |
| 2001 | Mazda | 626 | — | Rear | — |
| 2001 | Subaru | Impreza | — | Rear | — |
| 2001 | Subaru | Legacy | Manual | Rear | — |
| 2001 | Subaru | Outback | Manual | Rear | — |
| 2000 | Mazda | 626 | — | Rear | with California Emission System |
| 2000 | Subaru | Impreza | — | Rear | — |
| 2000 | Subaru | Legacy | Manual | Rear | — |
| 2000 | Subaru | Outback | Manual | Rear | — |
| 1999 | Subaru | Impreza | — | Rear | with California Emission System |
| 1999 | Subaru | Legacy | — | Rear | with California Emission System |
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