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Denso 234-4143 Oxygen Sensor - Downstream, Upstream or Upstream Front
| Brand | Denso 234-4143 |
|---|---|
| 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 | 9.84 |
| Product line | OE Style |
| Fits | Mazda · 8 vehicles |
OE style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps support faster operation and consistent emissions control.
Threaded mounting. Female connector and 4-wire design for a straightforward install.
Cross-references ACDelco 213-1409, ACDelco 213-1494 and BorgWarner OS684 for the same application. See all 15.
Denso OE Style Oxygen Sensor 234-4143
Denso 234-4143 is a specific-fit heated oxygen sensor built to OE-style dimensions for direct replacement in select Mazda applications. It is engineered for accurate exhaust feedback, stable engine management, and a first-time fit on the listed vehicles.
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
- Wiring harness length: 9.84 in.
- 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 consistent exhaust sensing and long service life. This Denso oxygen sensor 234-4143 is a direct-fit solution for Mazda MPV, Mazda Protege, and Mazda MX-3 applications listed below.
This part cross-references Bosch 13970 and NTK 22523 for the same application.
Vehicle Fitment
- Fits 2000-2001 Mazda MPV, downstream; excluding California; OE Style
- Fits 1999-2000 Mazda Protege, upstream; OE Style
- Fits 1992-1995 Mazda MX-3, upstream front; OE Style
Common Replacement Reasons
- Check engine light related to oxygen sensor performance
- Rough idle or inconsistent air-fuel control
- Reduced fuel economy from inaccurate exhaust readings
- Slow sensor response during closed-loop operation
- Failed emissions inspection tied to sensor fault codes
Installation Notes and Tips
Confirm the sensor position, connector style, and thread size before installation. Match the listed fitment exactly for your Mazda MPV, Protege, or MX-3, and verify whether the vehicle is downstream, upstream, or upstream front. Inspect the harness routing and connector location before tightening the threaded sensor into place.
Quality Assurance
Denso manufactures and tests this oxygen sensor to OE standards for consistent fit, function, and durability. The OE Style design is intended to deliver the correct part and the correct fit for the listed Mazda applications.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2001 | Mazda | MPV | Downstream | Excluding California.; OE Style |
| 2000 | Mazda | MPV | Downstream | Excluding California.; OE Style |
| 2000 | Mazda | Protege | Upstream | OE Style |
| 1999 | Mazda | Protege | Upstream | OE Style |
| 1995 | Mazda | MX-3 | Upstream Front | OE Style |
| 1994 | Mazda | MX-3 | Upstream Front | OE Style |
| 1993 | Mazda | MX-3 | Upstream Front | OE Style |
| 1992 | Mazda | MX-3 | Upstream Front | OE Style |
| No rows match your filter. | ||||