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Denso 234-4439 Oxygen Sensor - Downstream
| Brand | Denso 234-4439 |
|---|---|
| Position | Downstream |
| Connector Gender | Male |
| Mounting Type | Threaded |
| Sensor Type | Heated |
| Thread Diameter | 0.708 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 18.11 |
| Product line | OE Style |
| Fits | Kia and Hyundai · 12 vehicles |
OE style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps support faster operation and consistent readings.
Aluminum oxide trap layer. Protects the ceramic element for longer service life.
Cross-references ACDelco 213-3017, Bosch 15320 and Delphi ES11071 for the same application. See all 9.
Denso OE Style Oxygen Sensor 234-4439
Denso 234-4439 is an OE-style heated oxygen sensor built for exact replacement and first-time fit. It is designed for downstream applications on select Hyundai and Kia models, including the Sonata, Optima, Magentis, and Rondo.
Key Features
- Heated oxygen sensor for downstream exhaust monitoring
- Specific-fit design for direct replacement on listed vehicles
- 4-wire configuration with male connector
- 18.11 in. wiring harness length
- Threaded mounting with 0.708 in. thread diameter
- Built to OE standards for consistent sensor response
- Uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination
OE Style Design
Denso’s OE Style line focuses on direct-fit replacement parts that match factory specifications for fit and function. The 234-4439 oxygen sensor is precision built for the listed Hyundai and Kia applications, helping restore accurate exhaust feedback for the engine management system. This part cross-references Hyundai/Kia 3921025110 for the same application.
Vehicle Fitment
- Fits 2007-2009 Kia Magentis, Downstream, OE Style
- Fits 2006-2009 Kia Optima, Downstream, OE Style
- Fits 2006-2008 Hyundai Sonata, Downstream, OE Style
- Fits 2007-2008 Kia Rondo, Downstream, OE Style
What This Oxygen Sensor Helps Address
- Check engine light related to oxygen sensor performance
- Incorrect air-fuel ratio feedback from a worn downstream sensor
- Reduced fuel economy caused by inaccurate exhaust readings
- Rougher engine operation tied to degraded emissions monitoring
- Emissions test failures caused by a faulty sensor signal
Installation Notes
Verify the downstream location, connector style, wire count, and thread size before installation. This is a specific-fit, threaded sensor with a male connector, so matching the original harness and mounting point is important for proper installation on the Hyundai Sonata, Kia Optima, Kia Magentis, and Kia Rondo applications listed above.
Quality Assurance
Denso manufactures and tests this oxygen sensor to OE standards for accurate replacement fit and dependable operation. The design includes contamination protection for the sensing element, supporting long-term sensor performance in demanding exhaust conditions.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2009 | Kia | Magentis | Downstream | OE Style |
| 2009 | Kia | Optima | Downstream | OE Style |
| 2008 | Hyundai | Sonata | Downstream | OE Style |
| 2008 | Kia | Magentis | Downstream | OE Style |
| 2008 | Kia | Optima | Downstream | OE Style |
| 2008 | Kia | Rondo | Downstream | OE Style |
| 2007 | Hyundai | Sonata | Downstream | OE Style |
| 2007 | Kia | Magentis | Downstream | OE Style |
| 2007 | Kia | Optima | Downstream | OE Style |
| 2007 | Kia | Rondo | Downstream | OE Style |
| 2006 | Hyundai | Sonata | Downstream | OE Style |
| 2006 | Kia | Optima | Downstream | OE Style |
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