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Denso 234-4126 Oxygen Sensor - Upstream
| Brand | Denso 234-4126 |
|---|---|
| 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 | 12.60 |
| Product line | OE Style |
| Fits | Mazda · 3 vehicles |
OE style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps maintain accurate readings for efficient engine performance.
Threaded mount. Installs with a secure, specific-fit connection.
Cross-references ACDelco 213-2929, BorgWarner OS2431 and Bosch 15278 for the same application. See all 10.
Denso OE Style Oxygen Sensor 234-4126
Denso 234-4126 is a specific-fit heated oxygen sensor built to OE-style standards for accurate replacement on select Mazda applications. It is engineered for the upstream position on 2000-2002 Mazda 626 models, helping restore proper exhaust feedback for engine management.
The OE Style line focuses on exact replacement fit and consistent sensor performance. Denso also uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting long-term sensor durability and stable engine operation.
- Heated oxygen sensor for faster operating response
- Specific-fit design for direct replacement
- 4-wire configuration with female connector
- Threaded mounting with 0.708 in. thread diameter
- 12.60 in. wiring harness length
- Fits upstream location on select Mazda 626 applications
Detailed Product Information
This Denso oxygen sensor, part number 234-4126, is built for precise replacement on 2000 Mazda 626 upstream and 2001-2002 Mazda 626 upstream applications. It is a heated, threaded sensor with a 4-wire layout and a female connector, making it a direct-match option for vehicles that require the specified OE-style configuration. If you are searching for a Mazda 626 upstream oxygen sensor or Denso 234-4126 replacement, this part is matched to the listed fitment.
This part cross-references Bosch 15278 and NTK 22114 for the same application.
Common Issues This Part Can Address
- Fault codes related to oxygen sensor performance
- Rough idle caused by inaccurate exhaust feedback
- Reduced fuel economy from a slow or aging sensor
- Delayed closed-loop operation after startup
- Emissions test failures tied to upstream sensor output
Installation Notes and Tips
Confirm the upstream sensor location before ordering and match the connector, thread diameter, wire count, and harness length to the original part. On 2000-2002 Mazda 626 models, verify the OE-style threaded mounting and female connector style before installation. Use proper oxygen sensor service procedures to avoid damaging the sensing element or wiring.
Quality Assurance
Denso manufactures and tests this oxygen sensor to OE standards for fit and performance consistency. The OE Style product line is built for exact replacement applications, and the contamination-resistant trap layer is designed to help preserve sensor function over time.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2002 | Mazda | 626 | Upstream | OE Style |
| 2001 | Mazda | 626 | Upstream | OE Style |
| 2000 | Mazda | 626 | Upstream | California exempt parts can be used on pollution controlled vehicles in California.; OE Style |
| No rows match your filter. | ||||