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Denso 234-4392 Oxygen Sensor - Downstream
| Brand | Denso 234-4392 |
|---|---|
| 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 | 30.35 |
| Product line | OE Style |
| Fits | Mazda · 5 vehicles |
OE style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps support quicker operation and consistent readings.
Aluminum oxide trap layer. Protects the ceramic element from contamination.
Cross-references Bosch 15253, Bosch 15790 and Delphi ES20390 for the same application. See all 12.
Denso OE Style Oxygen Sensor for Mazda 3
Denso 234-4392 is an OE-style heated oxygen sensor built for direct replacement in specific Mazda applications. It is engineered for the downstream position on 2006-2009 Mazda 3 and 2009 Mazda 3 Sport models, with a first-time fit focus and OE-level construction.
Key Features
- Heated oxygen sensor for downstream exhaust monitoring
- Specific fit design for direct replacement
- 4-wire configuration with female connector
- Threaded mounting type with 0.708 in. thread diameter
- 30.35 in. wiring harness length for application-specific routing
- OE Style line built to match factory fit and function
OE Style Construction
Denso’s OE Style line is built around exact replacement requirements, with precision manufacturing and testing to OE standards. The sensor uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management and long service life. This Denso oxygen sensor, part number 234-4392, is a direct-fit solution for Mazda 3 and Mazda 3 Sport downstream applications.
This part cross-references Bosch 15253 and NTK 24446 for the same application.
What It Helps Address
- Check engine light related to downstream oxygen sensor faults
- Incorrect air-fuel feedback from a worn sensor
- Reduced fuel economy caused by slow sensor response
- Emissions test failures tied to oxygen sensor performance
- Exhaust monitoring issues on Mazda 3 and Mazda 3 Sport models
Installation Notes
Compatible With 2006-2009 Mazda 3, downstream, Canada & Exc. Calif.; OE Style. Compatible With 2009 Mazda 3 Sport, downstream, OE Style. Verify connector style, thread size, and harness routing before installation. Use proper oxygen sensor service tools and inspect the exhaust bung threads and wiring path during replacement. Denso 234-4392 is a specific-fit sensor, so confirm the vehicle’s downstream location before ordering.
Quality Assurance
Denso manufactures and tests this sensor to OE standards for consistent fit and performance. The OE Style design is intended to deliver the correct part and fit for the listed Mazda applications, with construction focused on durability and accurate exhaust feedback.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2009 | Mazda | 3 | Downstream | Canada & Exc. Calif.; OE Style |
| 2009 | Mazda | 3 Sport | Downstream | OE Style |
| 2008 | Mazda | 3 | Downstream | Canada & Exc. Calif.; OE Style |
| 2007 | Mazda | 3 | Downstream | Canada & Exc. Calif.; OE Style |
| 2006 | Mazda | 3 | Downstream | Canada & Exc. Calif.; OE Style |
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