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Denso 234-4148 Oxygen Sensor - Upstream Front or Upstream Left
| Brand | Denso 234-4148 |
|---|---|
| Position | Upstream Front |
| Connector Gender | Female |
| Mounting Type | Threaded |
| Sensor Type | Heated |
| Thread Diameter | 0.708 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 23.43 |
| Product line | OE Style |
| Fits | Mazda · 5 vehicles |
OE style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps support faster operation and efficient engine performance.
Threaded mount. Female connector and 4-wire design for a straightforward install.
Cross-references ACDelco 213-1411, BorgWarner OS1747 and BorgWarner OS1832 for the same application. See all 15.
Denso OE Style Oxygen Sensor 234-4148
Denso 234-4148 is an OE Style heated oxygen sensor built for direct replacement on select Mazda applications. It is engineered for exact fit and stable signal performance, with a threaded mounting design and a 4-wire female connector for straightforward integration.
For drivers searching for a Mazda 626 upstream front oxygen sensor or a Mazda Millenia upstream left oxygen sensor, this Denso part number 234-4148 provides the correct OE-style configuration for the listed vehicles.
Key Features
- Heated oxygen sensor for faster operating readiness
- Specific fit design for the listed Mazda applications
- 4-wire configuration with female connector
- Threaded mounting type with 0.708 in. thread diameter
- 23.43 in. wiring harness length
- OE Style construction for direct replacement use
OE Style Design Details
Denso’s OE Style line is built to match original equipment requirements for fit and function. This oxygen sensor uses precision-built components for first-time fitment and incorporates an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination. The result is a replacement sensor designed to maintain accurate exhaust feedback, support fuel control, and preserve engine efficiency on the Mazda 626 and Mazda Millenia applications listed below.
This part cross-references Bosch 13574 and NTK 22117 for the same application.
Vehicle Fitment
- Fits 2001-2002 Mazda 626, Upstream Front
- Fits 2001-2002 Mazda Millenia, Upstream Left
- Fits 2000 Mazda 626, Upstream Front
What This Sensor Helps Address
- Check engine light concerns related to oxygen sensor performance
- Incorrect air-fuel feedback from a worn upstream sensor
- Reduced fuel economy caused by slow or inaccurate exhaust readings
- Rough idle or drivability issues tied to sensor degradation
- Emissions test failures caused by faulty sensor output
Installation Notes and Tips
Verify the connector style, wire count, and mounting location before installation. This sensor is a specific-fit, threaded replacement, so matching the upstream front or upstream left position is important for proper installation on the correct Mazda 626 or Mazda Millenia application. Inspect the harness routing and connector condition during replacement to help ensure a secure electrical connection.
Quality Assurance
Denso manufactures and tests this oxygen sensor to OE standards for consistent replacement quality. The OE Style design is intended to deliver the right fit and correct application match for the listed Mazda vehicles, with materials selected to support long-term sensor durability.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2002 | Mazda | 626 | Upstream Front | OE Style |
| 2002 | Mazda | Millenia | Upstream Left | OE Style |
| 2001 | Mazda | 626 | Upstream Front | OE Style |
| 2001 | Mazda | Millenia | Upstream Left | OE Style |
| 2000 | Mazda | 626 | Upstream Front | California exempt parts can be used on pollution controlled vehicles in California.; OE Style |
| No rows match your filter. | ||||