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Denso 234-4944 Oxygen Sensor - Downstream
| Brand | Denso 234-4944 |
|---|---|
| Position | Downstream |
| Sensor Type | Heated |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 15.35 |
| Product line | OE Style |
| Fits | Ford and Lincoln · 11 vehicles |
OE style. Precision-built for exact replacement and a first-time fit.
Heated sensor. Delivers fast response for accurate emissions control.
Aluminum oxide trap layer. Helps protect the ceramic element for longer service life.
Cross-references Ford FL1Z9G444A, NTK 22144 and Walker Products 250-241183 for the same application. See all 4.
Denso OE Style Oxygen Sensor 234-4944
Denso 234-4944 is a heated oxygen sensor built to OE-style standards for precise replacement and consistent exhaust feedback. It is a specific-fit sensor for downstream applications on select Ford Expedition and Lincoln Navigator models, with a 4-wire design and 15.35-inch wiring harness length.
Key Features
- Heated oxygen sensor for downstream exhaust monitoring
- Specific-fit design for direct replacement on listed applications
- 4-wire configuration for OE-style signal and heater control
- 15.35-inch wiring harness length for application-specific routing
- Built to Denso OE Style standards for exact fit and function
- Uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination
Product Details
The Denso OE Style line focuses on exact replacement parts that match factory fitment and performance expectations. This oxygen sensor is engineered for downstream placement on 2015-2020 Lincoln Navigator and 2015-2020 Ford Expedition applications, including 2020 Ford Expedition and 2015-2018 Ford Expedition coverage. The Denso 234-4944 is designed to deliver accurate exhaust monitoring, stable heater operation, and dependable long-term service in the exhaust stream.
This part cross-references Ford FL1Z9G444A and NTK 22144 for the same application.
Common Issues This Sensor Can Address
- Check engine light related to downstream oxygen sensor performance
- Incorrect exhaust oxygen readings affecting fuel control strategy
- Slow sensor response from a worn heated O2 sensor
- Emissions test failures tied to sensor fault codes
- Rough fuel economy caused by inaccurate exhaust feedback
Installation Notes
Verify downstream sensor location before installation and compare the connector, wire count, and harness length to the original part. For best results, inspect the exhaust bung threads and wiring routing before fitting the sensor. Confirm the vehicle application by year, make, model, and position: Fits 2020 Ford Expedition, downstream; Fits 2015-2018 Ford Expedition, downstream; Fits 2015-2020 Lincoln Navigator, downstream.
Quality Assurance
Denso manufactures and tests this sensor to OE standards for precise replacement and first-time fit. The OE Style product line is built around factory-matched performance and durability, with contamination protection built into the sensor design for improved longevity.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2020 | Ford | Expedition | Downstream | OE Style |
| 2020 | Lincoln | Navigator | Downstream | OE Style |
| 2019 | Lincoln | Navigator | Downstream | OE Style |
| 2018 | Ford | Expedition | Downstream | OE Style |
| 2018 | Lincoln | Navigator | Downstream | OE Style |
| 2017 | Ford | Expedition | Downstream | OE Style |
| 2017 | Lincoln | Navigator | Downstream | OE Style |
| 2016 | Ford | Expedition | Downstream | OE Style |
| 2016 | Lincoln | Navigator | Downstream | OE Style |
| 2015 | Ford | Expedition | Downstream | OE Style |
| 2015 | Lincoln | Navigator | Downstream | OE Style |
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