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Delphi ES20391 Oxygen Sensor - Rear
| Brand | Delphi ES20391 |
|---|---|
| Position | Rear |
| Connector Shape | Square |
| Overall Length | 720.0 |
| Package Contents | Oxygen Sensor, Instruction Sheet |
| Sensor Type | Heated |
| Thread Size | 18 x 1.5 mm |
| Wire Quantity | 4 |
| Fits | Acura · 13 vehicles |
Heated sensor. Delivers faster operation for more responsive emissions monitoring.
Square connector. Simplifies hookup with a straightforward, secure connection.
OE heritage. Built with decades of original-equipment experience.
Cross-references Bosch 13093, DENSO Auto Parts 234-4097 and Gates 24541 for the same application. See all 24.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Rear Oxygen Sensor for Acura RL and TL
Delphi ES20391 is a heated rear oxygen sensor built for precise exhaust monitoring on select Acura applications. It combines OE-based engineering with a 4-wire design, square connector, and 18 x 1.5 mm thread size for a direct-fit replacement on the listed vehicles.
Key Features
- Heated oxygen sensor for rear exhaust placement
- 4-wire configuration with square connector shape
- 18 x 1.5 mm thread size
- Overall length: 720.0
- Package contents: oxygen sensor and instruction sheet
- OE heritage from Delphi’s long history supplying top automakers
Product Details
The Delphi ES20391 oxygen sensor is engineered using OE experience and manufacturing knowledge developed over decades of supplying major automakers. This rear sensor is specified for 1996-2004 Acura RL and 1995-1998 Acura TL applications, making it a focused replacement choice for drivers searching for a rear oxygen sensor for Acura RL, rear oxygen sensor for Acura TL, or Delphi ES20391 fitment by vehicle.
This part cross-references Bosch 13093 and DENSO Auto Parts 234-4097 for the same application.
Common Issues This Sensor May Address
- Check engine light related to rear oxygen sensor performance
- Incorrect exhaust oxygen readings reported to the engine control system
- Reduced fuel control accuracy caused by a worn sensor
- Emission test failures tied to sensor response issues
- Driveability concerns associated with aging exhaust sensors
Installation Notes and Tips
- Verify rear position and connector shape before installation.
- Confirm thread size is 18 x 1.5 mm for proper exhaust fitment.
- Inspect the harness routing and connector condition before connecting the new sensor.
- Follow the included instruction sheet during installation.
- Clear diagnostic trouble codes after replacement and confirm system operation.
Quality Assurance
Delphi builds this sensor with OE heritage and supplier experience drawn from work with leading automakers. That background supports consistent fitment and sensor construction for the listed Acura RL and Acura TL rear applications.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2004 | Acura | RL | Rear | — |
| 2003 | Acura | RL | Rear | — |
| 2002 | Acura | RL | Rear | — |
| 2001 | Acura | RL | Rear | — |
| 2000 | Acura | RL | Rear | — |
| 1999 | Acura | RL | Rear | — |
| 1998 | Acura | RL | Rear | — |
| 1998 | Acura | TL | Rear | — |
| 1997 | Acura | RL | Rear | — |
| 1997 | Acura | TL | Rear | — |
| 1996 | Acura | RL | Rear | — |
| 1996 | Acura | TL | Rear | — |
| 1995 | Acura | TL | Rear | — |
| No rows match your filter. | ||||