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Denso 234-4375 Oxygen Sensor - Upstream
| Brand | Denso 234-4375 |
|---|---|
| Position | Upstream |
| Connector Gender | Male |
| Mounting Type | Threaded |
| Sensor Type | Heated |
| Thread Diameter | 0.708 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 17.91 |
| Product line | OE Style |
| Fits | Ford · 5 vehicles |
OE style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps maintain accurate emissions monitoring and engine performance.
Threaded mounting. Installs with a secure, direct-fit connection.
Cross-references ACDelco 213-3923, BorgWarner OS2426 and Bosch 15804 for the same application. See all 12.
Denso OE Style Oxygen Sensor for Ford Focus
The Denso 234-4375 is a specific-fit heated oxygen sensor built for direct replacement in select Ford Focus applications. It is engineered to match OE-style fit and electrical connection requirements for accurate exhaust feedback and dependable drivability.
For 2003-2006 Ford Focus upstream manifold locations, this sensor supports precise air-fuel monitoring. It also fits 2006 Ford Focus upstream manifold PZEV applications, making the Denso 234-4375 a targeted replacement for common Ford Focus oxygen sensor service needs.
Key Features
- Heated oxygen sensor with a 4-wire design
- Specific fit for direct replacement applications
- Threaded mounting type with a 0.708 thread diameter
- 17.91-inch wiring harness length
- Male connector for OE-style electrical connection
- OE Style product line focused on exact replacement fitment
OE Style Design and 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 sensor operation and long service life. This approach is well suited for drivers searching for a Ford Focus upstream oxygen sensor, Denso 234-4375, or an OE-style replacement oxygen sensor for 2003-2006 Ford Focus models.
This part cross-references Bosch 15804 and Motorcraft DY1031 for the same application.
What This Oxygen Sensor Helps Address
- Check engine light concerns related to oxygen sensor performance
- Incorrect air-fuel ratio feedback from a worn upstream sensor
- Reduced fuel economy caused by delayed exhaust monitoring
- Rough idle or drivability issues tied to sensor degradation
- Failed emissions testing linked to a faulty manifold-mounted sensor
Installation Notes and Fitment
Fits 2003-2006 Ford Focus, Upstream, Loc. Manifold; OE Style. Fits 2006 Ford Focus, Upstream, Loc. Manifold; PZEV; OE Style. Confirm connector style, threaded mounting, and harness length before installation to ensure the replacement matches the original sensor layout.
Quality Assurance
Denso manufactures and tests this oxygen sensor to OE standards for consistent fit and function. The precision-built design supports first-time fitment on the specified Ford Focus applications and is backed by Denso’s OE-style engineering approach.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2006 | Ford | Focus | Upstream | Loc. Manifold; OE Style |
| 2006 | Ford | Focus | Upstream | Loc. Manifold; PZEV; OE Style |
| 2005 | Ford | Focus | Upstream | Loc. Manifold; OE Style |
| 2004 | Ford | Focus | Upstream | Loc. Manifold; OE Style |
| 2003 | Ford | Focus | Upstream | Loc. Manifold; OE Style |
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