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Denso 234-9085 Air / Fuel Ratio Sensor - Upstream
| Brand | Denso 234-9085 |
|---|---|
| Position | Upstream |
| Connector Gender | Male |
| Grade Type | Regular |
| Sensor Type | Heated |
| Thread Diameter | 0.711 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 18.11 |
| Product line | OE Style |
| Fits | Mazda · 6 vehicles |
OE style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Engineered for reliable air/fuel ratio monitoring.
Specific fit. Made to match the application with the right fit the first time.
Cross-references Bosch 15918, Mazda LF63188G1B and Mazda LF63188G1B9U for the same application. See all 6.
Denso OE Style Air/Fuel Ratio Sensor
Denso 234-9085 is an OE Style heated air/fuel ratio sensor built for precise replacement and first-time fit. It is engineered for the upstream position on select Mazda 3 models, with the correct connector, wire count, and harness length for a direct-service repair.
For 2004-2009 Mazda 3 upstream applications, this Denso air/fuel ratio sensor supports accurate exhaust feedback to the engine control system. The OE-style design helps maintain proper sensor response and simplifies replacement on vehicles that require a specific-fit sensor.
Key Features
- Heated air/fuel ratio sensor for upstream placement
- Specific fit design for direct replacement on select Mazda 3 applications
- 4-wire configuration with male connector
- 18.11 in. wiring harness length for application-specific routing
- Thread diameter: 0.711
- OE Style construction from Denso
Fitment Details
Fits 2004-2009 Mazda 3, upstream. California exempt parts can be used on pollution controlled vehicles in California; OE Style.
This part cross-references Bosch 15918 for the same application.
What This Sensor Helps Address
- Check engine light related to air/fuel ratio sensor performance
- Rough idle caused by inaccurate exhaust feedback
- Fuel trim issues from a slow or faulty upstream sensor
- Emissions test failures tied to sensor response problems
- Driveability concerns on Mazda 3 upstream sensor circuits
Installation Notes
Confirm the upstream sensor location before installation and match the connector style, wire count, and thread size to the original part. Inspect the harness routing and exhaust-side mounting area for heat damage, corrosion, or damaged threads before installing the new sensor. Verify the vehicle application by year and position for 2004-2009 Mazda 3 models.
Quality Assurance
Denso manufactures and tests this OE Style sensor to strict original-equipment standards for accurate replacement and proper fit. The part number 234-9085 is built as a direct-service component for the specified Mazda 3 upstream application.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2009 | Mazda | 3 | Upstream | California exempt parts can be used on pollution controlled vehicles in California.; OE Style |
| 2008 | Mazda | 3 | Upstream | California exempt parts can be used on pollution controlled vehicles in California.; OE Style |
| 2007 | Mazda | 3 | Upstream | California exempt parts can be used on pollution controlled vehicles in California.; OE Style |
| 2006 | Mazda | 3 | Upstream | California exempt parts can be used on pollution controlled vehicles in California.; OE Style |
| 2005 | Mazda | 3 | Upstream | California exempt parts can be used on pollution controlled vehicles in California.; OE Style |
| 2004 | Mazda | 3 | Upstream | California exempt parts can be used on pollution controlled vehicles in California.; OE Style |
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