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Denso 234-4540 Oxygen Sensor - Downstream Right
| Brand | Denso 234-4540 |
|---|---|
| Position | Downstream Right |
| Connector Gender | Female |
| Mounting Type | Threaded |
| Sensor Type | Heated |
| Thread Diameter | 0.708 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 16.93 |
| Product line | OE Style |
| Fits | Toyota · 5 vehicles |
OE-style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps support quicker operation and consistent emissions control.
Threaded mounting. Female connector and 4-wire design for a straightforward install.
Cross-references Bosch 18047, Delphi ES20415 and NTK 24824 for the same application. See all 6.
Denso OE Style Oxygen Sensor for Toyota Sienna
Denso 234-4540 is an OE-style heated oxygen sensor built for direct replacement on select Toyota Sienna applications. It is engineered for the downstream right position and uses a specific-fit, threaded design for accurate installation and reliable exhaust feedback.
Key Features
- OE Style replacement oxygen sensor from Denso
- Heated sensor design for faster operating response
- Specific fit for the downstream right location
- 4-wire configuration with female connector
- Threaded mounting with 0.708 in. thread diameter
- 16.93 in. wiring harness length for proper routing
Product Details
Denso 234-4540 is manufactured and tested to OE standards for exact replacement fit and consistent performance. The sensor uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management and fuel control. This part is a direct-fit oxygen sensor for 2011-2014 Toyota Sienna, downstream right, and also fits 2015 Toyota Sienna downstream right with the noted OE-style application through 09/2014. This part cross-references Bosch 18047 for the same application.
What This Oxygen Sensor Helps Address
- Check engine light related to oxygen sensor performance
- Incorrect air-fuel ratio feedback to the engine control module
- Reduced fuel economy caused by a worn downstream sensor
- Slow or inaccurate exhaust oxygen readings
- Emissions test failures tied to sensor response issues
Installation Notes and Tips
Confirm the downstream right position before installation and compare the connector, wire count, and thread size to the original sensor. The specific-fit design is intended for direct replacement on the listed Toyota Sienna applications, and the threaded mounting helps ensure proper seating in the exhaust stream. Verify harness routing and connector orientation during installation to avoid strain on the lead wire.
Quality Assurance
Denso builds this OE Style oxygen sensor to strict original-equipment standards for fit and function. The design focus on precise replacement dimensions, heated operation, and contamination resistance supports dependable service in the listed Toyota Sienna applications.
| Year | Make | Model | Drive Type | Position | Notes |
|---|---|---|---|---|---|
| 2015 | Toyota | Sienna | FWD | Downstream Right | To 09/2014; OE Style |
| 2014 | Toyota | Sienna | FWD | Downstream Right | OE Style |
| 2013 | Toyota | Sienna | FWD | Downstream Right | OE Style |
| 2012 | Toyota | Sienna | FWD | Downstream Right | OE Style |
| 2011 | Toyota | Sienna | FWD | Downstream Right | OE Style |
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