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Delphi ES20055 Oxygen Sensor - Rear Left
| Brand | Delphi ES20055 |
|---|---|
| Position | Rear Left |
| Connector Shape | Square |
| Overall Length | 1295.0 |
| Package Contents | Oxygen Sensor, Instruction Sheet |
| Sensor Type | Heated |
| Thread Size | 18 x 1.5 mm |
| Wire Quantity | 4 |
| Fits | INFINITI and Nissan · 9 vehicles |
Heated sensor. Delivers faster operation for dependable emissions monitoring.
Square connector. Simplifies hookup with a secure, straightforward connection.
OE heritage. Built with 100 years of OE experience and supplier knowledge.
Cross-references Bosch 13257, Bosch 15961 and DENSO Auto Parts 234-4703 for the same application. See all 22.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Delphi ES20055 Oxygen Sensor for Rear Left Fitment
The Delphi ES20055 is a heated oxygen sensor built for rear left placement on select Nissan and INFINITI applications. It combines OE-based engineering with the correct connector, thread size, and wire configuration for direct replacement service.
Key Features
- Heated oxygen sensor for rear left position
- 4-wire design with square connector shape
- 18 x 1.5 mm thread size
- Overall length: 1295.0
- Includes oxygen sensor and instruction sheet
- Delphi ES20055 replacement part for emission control service
Detailed Description
Built from Delphi’s OE heritage and supplier experience, the ES20055 oxygen sensor is engineered for emission control applications where accurate exhaust feedback matters. This rear left sensor is specified with a heated design, 4-wire layout, square connector, and 18 x 1.5 mm thread size to match the listed vehicle applications. It is a direct-fit service part for 1996-2000 Nissan Pathfinder and 1997-2000 INFINITI QX4 rear left locations. The Delphi ES20055 is also referenced by cross numbers such as DENSO 234-4703 and Bosch 13257 for the same application.
What This Sensor Helps Address
- Check engine light related to oxygen sensor performance
- Incorrect exhaust oxygen signal readings
- Fuel trim issues caused by a worn rear sensor
- Emission test failures tied to sensor response problems
- Rough running conditions associated with faulty exhaust feedback
Installation Notes and Tips
Verify rear left placement before installation and confirm the connector shape, wire count, and thread size match the original sensor. Inspect the harness routing and exhaust threads for damage or corrosion before fitting the new sensor. This part fits 1996-2000 Nissan Pathfinder, rear left, and 1997-2000 INFINITI QX4, rear left.
Quality Assurance
Delphi builds this oxygen sensor using OE-based knowledge developed through long-term supplier experience with major automakers. That background supports consistent fitment and serviceability for emission control repairs on the listed Nissan Pathfinder and INFINITI QX4 applications.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2000 | INFINITI | QX4 | Rear Left | — |
| 2000 | Nissan | Pathfinder | Rear Left | — |
| 1999 | INFINITI | QX4 | Rear Left | — |
| 1999 | Nissan | Pathfinder | Rear Left | — |
| 1998 | INFINITI | QX4 | Rear Left | — |
| 1998 | Nissan | Pathfinder | Rear Left | — |
| 1997 | INFINITI | QX4 | Rear Left | — |
| 1997 | Nissan | Pathfinder | Rear Left | — |
| 1996 | Nissan | Pathfinder | Rear Left | — |
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