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Denso 234-5134 Air / Fuel Ratio Sensor - Upstream, Upstream Left or Upstream Right
| Brand | Denso 234-5134 |
|---|---|
| Position | Upstream |
| Connector Gender | Male |
| Grade Type | Regular |
| Sensor Type | Heated |
| Thread Diameter | 0.711 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 5 |
| Wiring Harness Length | 40.67 |
| Product line | OE Style |
| Fits | BMW · 18 vehicles |
OE style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps deliver accurate air-fuel ratio readings.
Five-wire design with a male connector for straightforward installation.
Cross-references ACDelco 213-3894, ACDelco 213-3895 and BMW 11787515826 for the same application. See all 19.
Denso OE Style Air/Fuel Ratio Sensor
Denso 234-5134 is an OE Style heated air/fuel ratio sensor built for specific-fit replacement on select BMW and Porsche applications. It is precision-built and tested to OE standards for accurate fitment, with a 5-wire design and male connector for direct replacement service.
The OE Style line focuses on exact replacement parts that match the original application and installation layout. For buyers searching for a BMW 325i upstream air/fuel ratio sensor or a Porsche Cayenne upstream sensor replacement, Denso 234-5134 provides the correct fit profile for the listed vehicles.
Key Features
- Heated air/fuel ratio sensor for upstream placement
- Specific-fit design for direct replacement service
- 5-wire configuration with male connector
- Wiring harness length: 40.67
- Thread diameter: 0.711
- OE Style construction for exact replacement fit
Detailed Description
Denso 234-5134 is an emission control sensor designed to monitor air-fuel mixture data in the exhaust stream and support engine management on the listed BMW and Porsche models. This part cross-references Bosch 17175 and NTK 24317 for the same application. It is a direct-fit, heated sensor with the connector and harness layout matched to the original installation, making it a practical choice for upstream sensor replacement on 2003-2006 BMW 325Ci, 2003-2005 BMW 325i, 2004-2006 BMW X5, 2004-2005 BMW 545i, 2004-2005 BMW 645Ci, and 2003-2006 Porsche Cayenne.
What It Helps Address
- Check engine light related to air/fuel ratio sensor performance
- Rough idle caused by incorrect mixture feedback
- Fuel trim issues from a slow or inaccurate upstream sensor
- Emissions test failures tied to sensor response problems
- Driveability concerns from degraded exhaust oxygen sensing
Installation Notes and Tips
- Verify the vehicle position before ordering: upstream, upstream left, or upstream right as listed.
- Confirm connector style, wire count, and thread diameter against the original sensor.
- Use the exact vehicle application for BMW 325Ci, BMW 325i, BMW X5, BMW 545i, BMW 645Ci, or Porsche Cayenne.
- Inspect the harness routing and connector condition before installation.
- Clear diagnostic trouble codes after installation and confirm sensor operation with a scan tool.
Quality Assurance
Denso manufactures and tests this OE Style sensor to strict original-equipment standards for consistent replacement quality and first-time fit. The Denso 234-5134 is built as a specific-fit part for the listed applications, supporting accurate installation on BMW and Porsche upstream sensor locations.
| Year | Make | Model | Submodel | Transmission | Position | Notes |
|---|---|---|---|---|---|---|
| 2006 | BMW | 325Ci | — | — | Upstream | OE Style |
| 2006 | BMW | X5 | — | — | Upstream Left | OE Style |
| 2006 | Porsche | Cayenne | Turbo | — | Upstream | O.E. Quality Direct Fit Replacement Sensor; Air / Fuel Ratio Sensor - OE Style |
| 2005 | BMW | 325Ci | — | — | Upstream | OE Style |
| 2005 | BMW | 325i | — | — | Upstream | OE Style |
| 2005 | BMW | 545i | — | Manual | Upstream Right | OE Style |
| 2005 | BMW | 645Ci | — | Manual | Upstream Right | OE Style |
| 2005 | BMW | X5 | — | — | Upstream Left | OE Style |
| 2005 | Porsche | Cayenne | Turbo | — | Upstream | O.E. Quality Direct Fit Replacement Sensor; Air / Fuel Ratio Sensor - OE Style |
| 2004 | BMW | 325Ci | — | — | Upstream | OE Style |
| 2004 | BMW | 325i | — | — | Upstream | OE Style |
| 2004 | BMW | 545i | — | Manual | Upstream Right | OE Style |
| 2004 | BMW | 645Ci | — | Manual | Upstream Right | OE Style |
| 2004 | BMW | X5 | — | — | Upstream Left | OE Style |
| 2004 | Porsche | Cayenne | Turbo | — | Upstream | O.E. Quality Direct Fit Replacement Sensor; Air / Fuel Ratio Sensor - OE Style |
| 2003 | BMW | 325Ci | — | — | Upstream | OE Style |
| 2003 | BMW | 325i | — | — | Upstream | OE Style |
| 2003 | Porsche | Cayenne | Turbo | — | Upstream | O.E. Quality Direct Fit Replacement Sensor; Air / Fuel Ratio Sensor - OE Style |
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