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Denso 234-4988 Oxygen Sensor - Downstream
| Brand | Denso 234-4988 |
|---|---|
| Position | Downstream |
| Connector Gender | Male |
| Mounting Type | Threaded |
| Sensor Type | Heated |
| Thread Diameter | 0.708 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 9.53 |
| Product line | OE Style |
| Fits | Subaru · 14 vehicles |
OE style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps maintain accurate emissions control and engine performance.
Threaded, specific-fit design with a 4-wire male connector.
Cross-references NTK 24478, Subaru 22690AB010 and Walker Products 250-241160 for the same application. See all 4.
Denso OE Style Oxygen Sensor 234-4988
Denso 234-4988 is a heated, specific-fit oxygen sensor built for direct replacement in select Subaru applications. It is engineered for the downstream position on Subaru WRX and Forester models, with OE-style fitment for accurate installation and dependable exhaust monitoring.
OE Style Fit and Sensor Design
This Denso OE Style oxygen sensor uses a threaded mounting design, a male connector, 4 wires, and a 9.53-inch wiring harness length. The heated sensor design supports faster operating temperature, while the specific-fit construction helps ensure the right connector, thread size, and harness layout for the application. Denso 234-4988 is built to match the original sensor location and function on Subaru WRX and Subaru Forester vehicles.
- Heated oxygen sensor for downstream exhaust monitoring
- Specific-fit replacement for direct installation
- 4-wire design with male connector
- Threaded mounting with 0.708-inch thread diameter
- OE-style replacement for select Subaru WRX and Forester models
Vehicle Fitment
- Fits 2018-2021 Subaru WRX, Downstream
- Fits 2018 Subaru Forester, Downstream
- Fits 2014-2017 Subaru Forester, Downstream
- Fits 2015-2017 Subaru WRX, Downstream
Detailed Application Notes
Use this oxygen sensor when replacing a downstream sensor on a 2018-2021 Subaru WRX, 2018 Subaru Forester, 2014-2017 Subaru Forester, or 2015-2017 Subaru WRX. This part cross-references NTK 24478 for the same application. The Denso 234-4988 is also referenced to Subaru 22690AB010 and Walker Products 250-241160 or 350-34825.
Common Reasons for Replacement
- Check engine light related to downstream oxygen sensor performance
- Incorrect air-fuel feedback from a worn exhaust sensor
- Reduced fuel economy caused by inaccurate exhaust readings
- Slow sensor response after heat cycling and age
- Corrosion or connector damage at the original sensor location
Installation Notes and Quality Assurance
Confirm the downstream position, connector style, wire count, and thread diameter before installation. Match the harness length and OE-style connector to the original sensor to avoid fitment issues. Denso manufactures and tests this oxygen sensor to OE standards, and its aluminum oxide trap layer helps protect the sensing element from silicone and lead contamination for stable performance and longer service life.
For Subaru WRX and Forester owners looking for a direct-fit downstream oxygen sensor, Denso 234-4988 provides OE-style replacement fitment with application-specific engineering.
| Year | Make | Model | Submodel | Position | Notes |
|---|---|---|---|---|---|
| 2021 | Subaru | WRX | — | Downstream | O.E. Quality Direct Fit Replacement Sensor; Oxygen Sensor - OE Style |
| 2020 | Subaru | WRX | — | Downstream | O.E. Quality Direct Fit Replacement Sensor; Oxygen Sensor - OE Style |
| 2019 | Subaru | WRX | — | Downstream | O.E. Quality Direct Fit Replacement Sensor; Oxygen Sensor - OE Style |
| 2018 | Subaru | Forester | — | Downstream | O.E. Quality Direct Fit Replacement Sensor; Oxygen Sensor - OE Style |
| 2018 | Subaru | WRX | — | Downstream | O.E. Quality Direct Fit Replacement Sensor; Oxygen Sensor - OE Style |
| 2017 | Subaru | Forester | 2.0XT Touring | Downstream | OE Style |
| 2017 | Subaru | Forester | 2.0XT Premium | Downstream | OE Style |
| 2017 | Subaru | Forester | 2.0XT Limited | Downstream | OE Style |
| 2017 | Subaru | WRX | — | Downstream | OE Style |
| 2016 | Subaru | Forester | — | Downstream | OE Style |
| 2016 | Subaru | WRX | — | Downstream | OE Style |
| 2015 | Subaru | Forester | — | Downstream | OE Style |
| 2015 | Subaru | WRX | — | Downstream | OE Style |
| 2014 | Subaru | Forester | — | Downstream | OE Style |
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