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Delphi ES20211 Oxygen Sensor - Rear
| Brand | Delphi ES20211 |
|---|---|
| Position | Rear |
| Connector Shape | Square |
| Overall Length | 575.0 |
| Package Contents | Oxygen Sensor, Instruction Sheet |
| Sensor Type | Heated |
| Thread Size | 18 x 1.5 mm |
| Wire Quantity | 4 |
| Fits | Kia and Hyundai · 17 vehicles |
Heated sensor. Provides faster operation for more responsive emissions monitoring.
Square connector. Simplifies hookup with a straightforward, secure connection.
OE heritage. Built with 100 years of OE experience and supplier knowledge.
Cross-references BBB Industries 13751, Carlson 15245 and DENSO Auto Parts 234-4042 for the same application. See all 19.
Delphi ES20211 Rear Oxygen Sensor
The Delphi ES20211 is a heated rear oxygen sensor built for specific Hyundai and Kia applications. It uses a 4-wire design, square connector shape, and 18 x 1.5 mm thread size to match the listed fitments and restore accurate exhaust feedback.
Key Features
- Heated oxygen sensor for rear position applications
- 4-wire configuration with square connector shape
- 18 x 1.5 mm thread size
- Overall length: 575.0
- Includes oxygen sensor and instruction sheet
- OE-focused engineering backed by Delphi’s long supplier history
Detailed Description
Delphi ES20211 is an emission control sensor for rear oxygen sensor replacement on select Hyundai Sonata, Hyundai Santa Fe, and Kia Optima models. Built from Delphi’s OE heritage and aftermarket experience, this sensor is specified for vehicles that require a heated rear O2 sensor with the listed connector and thread configuration. It is a direct-fit style replacement for applications calling for Delphi ES20211.
This part cross-references DENSO Auto Parts 234-4042 and 234-4434 for the same application.
Vehicle Fitment
- Fits 2001-2006 Kia Optima, Rear
- Fits 2002-2005 Hyundai Sonata, Rear
- Fits 2001-2004 Hyundai Santa Fe, Rear
- Fits 1999-2001 Hyundai Sonata, Rear, with California Emission System
Common Replacement Reasons
- Check engine light related to rear oxygen sensor performance
- Fault codes tied to slow sensor response or heater circuit issues
- Reduced exhaust monitoring accuracy on the rear sensor circuit
- Failed emissions inspection caused by a worn oxygen sensor
- Rough fuel control feedback from an aging emission sensor
Installation Notes
Confirm the rear sensor location, connector shape, wire count, and thread size before installation. Compare the original sensor length and connector style to the Delphi ES20211 to verify proper routing and fit. Follow the vehicle service procedure for removal and installation on the exhaust system.
Quality Assurance
Delphi builds aftermarket parts using knowledge developed through decades of OE supply experience. The ES20211 reflects that background with application-specific engineering for listed Hyundai and Kia rear oxygen sensor replacements.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2006 | Kia | Optima | Rear | — |
| 2005 | Hyundai | Sonata | Rear | — |
| 2005 | Kia | Optima | Rear | — |
| 2004 | Hyundai | Santa Fe | Rear | — |
| 2004 | Hyundai | Sonata | Rear | — |
| 2004 | Kia | Optima | Rear | — |
| 2003 | Hyundai | Santa Fe | Rear | — |
| 2003 | Hyundai | Sonata | Rear | — |
| 2003 | Kia | Optima | Rear | — |
| 2002 | Hyundai | Santa Fe | Rear | — |
| 2002 | Hyundai | Sonata | Rear | — |
| 2002 | Kia | Optima | Rear | — |
| 2001 | Hyundai | Santa Fe | Rear | — |
| 2001 | Hyundai | Sonata | Rear | with California Emission System |
| 2001 | Kia | Optima | Rear | — |
| 2000 | Hyundai | Sonata | Rear | with California Emission System |
| 1999 | Hyundai | Sonata | Rear | with California Emission System |
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