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Delphi ES20129 Oxygen Sensor - Rear
| Brand | Delphi ES20129 |
|---|---|
| Position | Rear |
| Connector Shape | Square |
| Overall Length | 740.0 |
| Package Contents | Oxygen Sensor, Instruction Sheet |
| Sensor Type | Heated |
| Thread Size | 18 x 1.5 mm |
| Wire Quantity | 4 |
| Fits | Nissan · 12 vehicles |
OE heritage. Built with a century of original-equipment experience.
Heated sensor. Helps the oxygen sensor reach operating temperature quickly.
Square connector. Features a 4-wire design with an 18 x 1.5 mm thread.
Cross-references Bosch 15973, Bosch 15975 and DENSO Auto Parts 234-4323 for the same application. See all 28.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Rear Oxygen Sensor for Nissan Frontier and Xterra
Delphi ES20129 is a heated rear oxygen sensor built for specific Nissan applications from 1998-2004. It uses a 4-wire design, square connector shape, and 18 x 1.5 mm thread size to match the listed OE-style fitment for Nissan Frontier and Nissan Xterra rear sensor locations.
Key Features
- Heated oxygen sensor for rear exhaust monitoring
- 4-wire configuration for the listed applications
- Square connector shape
- 18 x 1.5 mm thread size
- Overall length: 740.0
- Package contents: oxygen sensor and instruction sheet
- Rear position fitment
Product Details
Delphi ES20129 is engineered from OE heritage and decades of supplier experience with major automakers. For Nissan Frontier and Nissan Xterra rear sensor replacement, this oxygen sensor is specified for 2001-2004 Nissan Frontier rear and 2001-2004 Nissan Xterra rear, plus California Emission System applications on 1998-2000 Nissan Frontier rear and 2000 Nissan Xterra rear. This part cross-references DENSO Auto Parts 234-4323 and Bosch 15973 for the same application.
What It Helps Address
- Check engine light related to rear oxygen sensor performance
- Incorrect exhaust oxygen feedback to the engine control system
- Emissions test failures tied to rear sensor faults
- Rough or inconsistent fuel control caused by a failing sensor signal
- Replacement needs for aged or damaged rear O2 sensors
Installation Notes and Tips
Verify the rear sensor location, connector shape, wire count, and thread size before installation. Confirm the vehicle’s emission configuration, especially California Emission System applications, before ordering. Use the included instruction sheet during installation and inspect the exhaust bung threads and wiring routing before final tightening. For Nissan Frontier and Nissan Xterra rear sensor replacement, match the connector and harness routing to the original sensor.
Quality Assurance
Delphi builds aftermarket parts using OE experience and knowledge developed through long-term supplier relationships with leading automakers. ES20129 reflects that OE-focused engineering approach for the listed Nissan Frontier and Nissan Xterra applications.
| Year | Make | Model | Submodel | Position | Notes |
|---|---|---|---|---|---|
| 2004 | Nissan | Frontier | — | Rear | — |
| 2004 | Nissan | Xterra | — | Rear | — |
| 2003 | Nissan | Frontier | Base | Rear | — |
| 2003 | Nissan | Xterra | — | Rear | — |
| 2002 | Nissan | Frontier | Base | Rear | — |
| 2002 | Nissan | Xterra | — | Rear | — |
| 2001 | Nissan | Frontier | — | Rear | — |
| 2001 | Nissan | Xterra | — | Rear | — |
| 2000 | Nissan | Frontier | — | Rear | with California Emission System |
| 2000 | Nissan | Xterra | — | Rear | with California Emission System |
| 1999 | Nissan | Frontier | — | Rear | with California Emission System |
| 1998 | Nissan | Frontier | — | Rear | with California Emission System |
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