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Denso 234-4677 Oxygen Sensor - Upstream
| Brand | Denso 234-4677 |
|---|---|
| Position | Upstream |
| Connector Gender | Female |
| Mounting Type | Threaded |
| Sensor Type | Heated |
| Thread Diameter | 0.708 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 32.09 |
| Product line | OE Style |
| Fits | BMW · 8 vehicles |
OE style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps support quicker operation and consistent performance.
Threaded mounting. Female connector and 4-wire design for a straightforward install.
Cross-references ACDelco 213-3129, BMW 11781743994 and BorgWarner OS1866 for the same application. See all 9.
OE Style Oxygen Sensor for BMW M3 and Z3
Denso 234-4677 is an OE Style heated oxygen sensor built for direct replacement on select BMW applications. It is engineered for specific fitment, accurate signal response, and a first-time fit on the upstream position for BMW M3 and BMW Z3 models.
For drivers searching for a BMW M3 upstream oxygen sensor or a BMW Z3 upstream O2 sensor, this Denso part number 234-4677 is built to match the original mounting and connector layout.
Key Features
- Heated oxygen sensor for faster operating readiness
- Specific fit design for direct replacement
- 4-wire configuration with female connector
- Threaded mounting type with 0.708 in. thread diameter
- 32.09 in. wiring harness length
- OE Style construction for factory-like fit and function
Product Details
Denso’s OE Style sensor line is manufactured and tested to OE-level standards for consistent performance and exact replacement fit. Part number 234-4677 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 part cross-references Bosch 13949 and NTK 25609 for the same application.
Compatible With 2001-2006 BMW M3, upstream, cylinder 1, 2, 3; OE Style. Compatible With 2001-2002 BMW Z3, upstream, cylinder 1, 2, 3; OE Style. These fitments make 234-4677 a direct option for BMW M3 and BMW Z3 owners replacing an upstream heated oxygen sensor.
Common Issues This Sensor May Address
- Check engine light related to oxygen sensor performance
- Rough idle caused by inaccurate air-fuel feedback
- Reduced fuel economy from a slow or failing upstream sensor
- Emissions test failure tied to sensor response issues
- Delayed closed-loop operation after startup
Installation Notes and Tips
Verify the upstream location, connector style, wire count, and thread size before installation. Because this is a specific-fit sensor, compare the original routing and harness length to the vehicle’s factory layout. Use proper oxygen sensor service procedures to avoid damaging the sensing element or connector during removal and installation.
Quality Assurance
Denso manufactures and tests this OE Style oxygen sensor to strict original-equipment standards for fit and performance. The design focus on exact replacement dimensions and contamination resistance supports dependable operation in BMW M3 and BMW Z3 applications.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2006 | BMW | M3 | Upstream | Cylinder 1,2,3; OE Style |
| 2005 | BMW | M3 | Upstream | Cylinder 1,2,3; OE Style |
| 2004 | BMW | M3 | Upstream | Cylinder 1,2,3; OE Style |
| 2003 | BMW | M3 | Upstream | Cylinder 1,2,3; OE Style |
| 2002 | BMW | M3 | Upstream | Cylinder 1,2,3; OE Style |
| 2002 | BMW | Z3 | Upstream | Cylinder 1,2,3; OE Style |
| 2001 | BMW | M3 | Upstream | Cylinder 1,2,3; OE Style |
| 2001 | BMW | Z3 | Upstream | Cylinder 1,2,3; OE Style |
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