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Delphi ES20139 Oxygen Sensor - Front or Rear
| Brand | Delphi ES20139 |
|---|---|
| Position | Front |
| Connector Shape | Square |
| Overall Length | 1720.0 |
| Package Contents | Oxygen Sensor, Instruction Sheet |
| Position(s) | Front, Rear. For the position specific to your vehicle, refer to the Application tab. |
| Sensor Type | Heated |
| Thread Size | 18 x 1.5 mm |
| Wire Quantity | 4 |
| Fits | Chevrolet, Pontiac, Buick, and Oldsmobile · 25 vehicles |
Heated sensor. Helps the system reach operating temperature quickly.
Square connector. Simplifies a secure electrical connection.
OE heritage. Built with decades of original-equipment experience.
Cross-references BBB Industries 11169, Bosch 13450 and DENSO Auto Parts 234-4616 for the same application. See all 40.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Delphi ES20139 Oxygen Sensor Overview
Delphi ES20139 is a heated oxygen sensor built for emission control service on select GM compact cars. It uses a 4-wire design, square connector, and 18 x 1.5 mm thread size to match the specified application and restore accurate exhaust feedback.
Compatible With 1995-2002 Pontiac Sunfire rear applications, 1995-2001 Chevrolet Cavalier rear applications, 1996-1998 Buick Skylark rear applications, 1996-1998 Oldsmobile Achieva rear applications, 1996-1998 Pontiac Grand Am rear applications, and 2002 Chevrolet Cavalier front applications.
- Heated oxygen sensor for faster operating response
- 4-wire configuration for the listed vehicle applications
- Square connector shape for direct-fit electrical connection
- 18 x 1.5 mm thread size
- 1720.0 overall length
- Package contents: oxygen sensor and instruction sheet
Application Details
This Delphi ES20139 oxygen sensor is specified for front and rear positions depending on the vehicle. For the exact location on your Chevrolet Cavalier, Pontiac Sunfire, Buick Skylark, Oldsmobile Achieva, or Pontiac Grand Am, refer to the application tab and match the position listed for your model year.
Delphi draws on OE heritage and more than a century of original-equipment experience, so the ES20139 reflects the dimensional and electrical requirements used in the listed applications. This part cross-references Bosch 13450 and DENSO Auto Parts 234-4616 for the same application.
What It Helps Address
- Check engine light related to oxygen sensor performance
- Incorrect air-fuel feedback to the engine control module
- Rough idle or drivability issues tied to exhaust sensor signal errors
- Failed emissions inspection caused by a worn sensor
- Slow sensor response during closed-loop fuel control
Installation Notes
Confirm the connector shape, wire count, thread size, and sensor position before installation. Match the front or rear location exactly to the vehicle application, and verify the harness routing and overall length before final fitment on the 2002 Chevrolet Cavalier, 1995-2001 Chevrolet Cavalier, or 1995-2002 Pontiac Sunfire.
Quality Assurance
Delphi builds aftermarket parts using OE experience and application knowledge developed through long-term supplier relationships with major automakers. The ES20139 is engineered to meet the listed fitment and sensor specifications for dependable emission control service.
| Year | Make | Model | Transmission | Position | Notes |
|---|---|---|---|---|---|
| 2002 | Chevrolet | Cavalier | — | Front | — |
| 2002 | Pontiac | Sunfire | — | Rear | — |
| 2001 | Chevrolet | Cavalier | — | Rear | — |
| 2001 | Pontiac | Sunfire | — | Rear | — |
| 2000 | Chevrolet | Cavalier | — | Rear | — |
| 2000 | Pontiac | Sunfire | — | Rear | — |
| 1999 | Chevrolet | Cavalier | — | Rear | — |
| 1999 | Pontiac | Sunfire | — | Rear | — |
| 1998 | Buick | Skylark | — | Rear | — |
| 1998 | Chevrolet | Cavalier | — | Rear | — |
| 1998 | Oldsmobile | Achieva | — | Rear | — |
| 1998 | Pontiac | Grand Am | — | Rear | — |
| 1998 | Pontiac | Sunfire | — | Rear | — |
| 1997 | Buick | Skylark | — | Rear | — |
| 1997 | Chevrolet | Cavalier | — | Rear | — |
| 1997 | Oldsmobile | Achieva | — | Rear | — |
| 1997 | Pontiac | Grand Am | — | Rear | — |
| 1997 | Pontiac | Sunfire | — | Rear | — |
| 1996 | Buick | Skylark | — | Rear | — |
| 1996 | Chevrolet | Cavalier | — | Rear | — |
| 1996 | Oldsmobile | Achieva | — | Rear | — |
| 1996 | Pontiac | Grand Am | — | Rear | — |
| 1996 | Pontiac | Sunfire | — | Rear | — |
| 1995 | Chevrolet | Cavalier | Automatic | Rear | — |
| 1995 | Pontiac | Sunfire | — | Rear | — |
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