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Denso 234-4804 Oxygen Sensor - Downstream Left
| Brand | Denso 234-4804 |
|---|---|
| Position | Downstream Left |
| Connector Gender | Male |
| Mounting Type | Threaded |
| Sensor Type | Heated |
| Thread Diameter | 0.708 |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Wiring Harness Length | 13.39 |
| Product line | OE Style |
| Fits | Toyota · 2 vehicles |
OE style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps maintain efficient engine performance.
Threaded mounting. Installs with a secure, direct-fit connection.
Cross-references ACDelco 213-2935, BorgWarner OS1591 and Bosch 13355 for the same application. See all 9.
Denso OE Style Oxygen Sensor for Toyota 4Runner
Denso 234-4804 is an OE Style heated oxygen sensor built for direct replacement on select Toyota applications. It is engineered for the 2003-2004 Toyota 4Runner, downstream left position, with a specific fit and threaded mounting for accurate installation and reliable exhaust feedback.
Key Features
- OE Style replacement oxygen sensor for precise fitment
- Heated sensor design for faster operating response
- Specific fit for the downstream left location
- 4-wire configuration with male connector
- Threaded mounting with 0.708 in. thread diameter
- 13.39 in. wiring harness length for application-specific routing
Built for OE-Level Replacement
Denso 234-4804 is manufactured and tested to OE standards, with precision-built components intended to match the original sensor form and function. The Denso OE Style line focuses on first-time fit and dependable replacement performance, and this sensor includes an aluminum oxide trap layer that helps protect the ceramic element from silicone and lead contamination. For drivers servicing a Toyota 4Runner oxygen sensor issue, this part supports accurate exhaust monitoring and stable engine management.
This part cross-references Bosch 13355 and NTK 24848 for the same application.
Common Issues This Sensor Can Address
- Check engine light related to oxygen sensor performance
- Incorrect air-fuel ratio readings from a worn downstream sensor
- Reduced fuel economy caused by slow or inaccurate exhaust feedback
- Emissions test failure tied to sensor response problems
- Rougher engine operation from degraded sensor output
Installation Notes and Tips
Verify the downstream left location before ordering and match the connector style, wire count, and threaded mounting dimensions to the original part. On a 2003-2004 Toyota 4Runner, Denso 234-4804 is a direct-fit replacement, so installation is straightforward when the existing harness routing and connector match the OE layout. Inspect the exhaust bung threads and surrounding wiring before installation to ensure proper seating and sensor signal integrity.
Quality Assurance
Denso manufactures this oxygen sensor to strict OE standards and tests it for replacement accuracy, fit, and durability. The OE Style design reflects Denso’s focus on exact-match replacement parts for Toyota 4Runner service work.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2004 | Toyota | 4Runner | Downstream Left | OE Style |
| 2003 | Toyota | 4Runner | Downstream Left | OE Style |
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