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Denso 234-4249 Oxygen Sensor - Downstream
| Brand | Denso 234-4249 |
|---|---|
| Position | Downstream |
| Connector Gender | Female |
| Mounting Type | Threaded |
| Sensor Type | Heated |
| Thread Diameter | 0.708 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 11.02 |
| Product line | OE Style |
| Fits | Buick, Chevrolet, and Pontiac · 7 vehicles |
OE style replacement. Precision-built for an exact, first-time fit.
Heated sensor. Helps support efficient engine performance and fuel economy.
Aluminum oxide trap layer. Protects the ceramic element for longer service life.
Cross-references ACDelco 213-4252, Bosch 15132 and Delphi ES20352 for the same application. See all 7.
Denso OE Style Oxygen Sensor 234-4249
Denso 234-4249 is a heated, specific-fit oxygen sensor built for direct replacement in downstream applications. It is engineered for 2008-2009 Buick Allure, 2008-2009 Buick LaCrosse, 2008-2009 Chevrolet Impala, and 2008 Pontiac Grand Prix, with OE-style fitment for a first-time installation.
The OE Style line is designed around exact replacement requirements, with precision-built components and Denso’s aluminum oxide trap layer to help protect the sensing element from silicone and lead contamination. That focus on sensor durability and accurate signal response supports consistent engine management on vehicles such as the Chevrolet Impala and Buick LaCrosse.
- Heated oxygen sensor for downstream placement
- Specific fit for direct replacement applications
- 4-wire design with female connector
- Threaded mounting type with 0.708 in. thread diameter
- Wiring harness length: 11.02 in.
- OE Style construction for exact replacement fit
Fitment Details
- Fits 2008-2009 Buick Allure, downstream, OE Style
- Fits 2008-2009 Buick LaCrosse, downstream, OE Style
- Fits 2008-2009 Chevrolet Impala, downstream, OE Style
- Fits 2008 Pontiac Grand Prix, downstream, OE Style
What This Oxygen Sensor Helps Address
- Check engine light related to oxygen sensor performance
- Incorrect air-fuel mixture readings from a worn downstream sensor
- Reduced fuel economy caused by inaccurate exhaust feedback
- Slow or unstable sensor response in emission control monitoring
- Contamination-related sensor degradation from silicone or lead exposure
Installation Notes and Tips
Confirm downstream sensor location before ordering and match the connector, wire count, and thread size to the original part. For best results, inspect the exhaust threads and wiring route before installation, and verify the sensor is seated securely in the threaded mounting point. This part cross-references Bosch 15132 and NTK 21023 for the same application.
Quality Assurance
Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and consistent performance. The OE Style product line is built for exact fitment and dependable sensor operation in emission control service.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2009 | Buick | Allure | Downstream | OE Style |
| 2009 | Buick | LaCrosse | Downstream | OE Style |
| 2009 | Chevrolet | Impala | Downstream | OE Style |
| 2008 | Buick | Allure | Downstream | OE Style |
| 2008 | Buick | LaCrosse | Downstream | OE Style |
| 2008 | Chevrolet | Impala | Downstream | OE Style |
| 2008 | Pontiac | Grand Prix | Downstream | OE Style |
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