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Denso 234-4509 Oxygen Sensor
| Brand | Denso 234-4509 |
|---|---|
| Position | Downstream Right, Downstream, Downstream Left, and Downstream Rear |
| Wiring Harness Length | 25.59 |
| Sensor Type | Heated |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Connector Gender | Female |
| Thread Diameter | 0.708 |
| Mounting Type | Threaded |
| Product line | Oxygen Sensor - OE Style |
| Fits | Lexus and Toyota · 38 vehicles |
OE style replacement. Precision-built for exact replacement and a first-time fit.
Heated sensor. Helps deliver faster operation and consistent performance.
Threaded mounting. Installs with a secure, specific-fit connection.
Cross-references ACDelco 213-3873, BorgWarner OS2265 and Bosch 13679 for the same application. See all 27.
Denso OE Style Oxygen Sensor 234-4509
Denso 234-4509 is an OE Style heated oxygen sensor built for direct replacement on select Toyota and Lexus applications. It uses a specific-fit, threaded design with a female connector and 4-wire configuration for accurate installation on the listed downstream positions.
Key Features
- Heated oxygen sensor for downstream exhaust monitoring
- Specific fit for direct replacement on listed vehicles
- Threaded mounting type with 0.708 thread diameter
- 25.59 wiring harness length for OE-style routing
- 4-wire design with female connector
- Built to OE standards for exact replacement fit
- Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination
OE Style Design and Fitment
The Denso OE Style line is built for exact replacement and first-time fitment on the applications listed below. This part number, 234-4509, is used on downstream oxygen sensor locations for Toyota Highlander, Lexus RX350, Lexus RX450h, and Lexus RX330 models. It is a direct-fit replacement for drivers servicing emissions control systems on these vehicles.
This part cross-references Bosch (e.g., 13679) for the same application.
Vehicle Fitment
- Fits 2017 Toyota Highlander, Downstream Left
- Fits 2004-2016 Toyota Highlander, Downstream Right
- Fits 2015 Lexus RX350, Downstream Rear
- Fits 2007-2014 Lexus RX350, Downstream Right
- Fits 2010-2013 Lexus RX450h, Downstream Right
- Fits 2011-2013 Toyota Highlander, Downstream Left
- Fits 2009-2013 Toyota Highlander, Downstream
- Fits 2004-2006 Lexus RX330, Downstream Right
What This Part Helps Address
- Check engine light related to oxygen sensor performance
- Incorrect downstream air-fuel feedback readings
- Reduced fuel economy caused by a failing sensor
- Emissions test failures tied to sensor degradation
- Slow sensor response from contamination or age
Installation Notes and Tips
Confirm the connector style, wire count, and downstream position before installation. Denso 234-4509 is a specific-fit sensor, so matching the vehicle year, model, and sensor location is important for proper installation on Toyota Highlander and Lexus RX-series applications. Verify thread size and harness routing against the original part before final tightening.
Quality Assurance
Denso manufactures and tests this oxygen sensor to OE standards for consistent fit and function. The sensor’s protective aluminum oxide trap layer is engineered to help shield the ceramic element from silicone and lead contamination, supporting long service life and stable engine performance.
| Year | Make | Model | Submodel | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|
| 2017 | Toyota | Highlander | XLE | GAS | Downstream Left | OE; Oxygen Sensor - OE Style |
| 2016 | Toyota | Highlander | — | GAS | Downstream Right | OE Style |
| 2015 | Lexus | RX350 | — | — | Downstream Rear | OE Style |
| 2015 | Toyota | Highlander | — | GAS | Downstream Right | OE Style |
| 2014 | Lexus | RX350 | — | — | Downstream Right | OE Style |
| 2014 | Toyota | Highlander | — | GAS | Downstream Right | OE Style |
| 2013 | Lexus | RX350 | — | — | Downstream Right | OE Style |
| 2013 | Lexus | RX450h | — | — | Downstream Right | OE Style |
| 2013 | Toyota | Highlander | — | GAS | Downstream Right | OE Style |
| 2013 | Toyota | Highlander | — | ELECTRIC/GAS | Downstream Left | OE Style |
| 2013 | Toyota | Highlander | — | — | Downstream | OE Style |
| 2012 | Lexus | RX350 | — | — | Downstream Right | OE Style |
| 2012 | Lexus | RX450h | — | — | Downstream Right | OE Style |
| 2012 | Toyota | Highlander | — | GAS | Downstream Right | OE Style |
| 2012 | Toyota | Highlander | — | ELECTRIC/GAS | Downstream Left | OE Style |
| 2012 | Toyota | Highlander | — | — | Downstream | OE Style |
| 2011 | Lexus | RX350 | — | — | Downstream Right | OE Style |
| 2011 | Lexus | RX450h | — | — | Downstream Right | OE Style |
| 2011 | Toyota | Highlander | — | GAS | Downstream Right | OE Style |
| 2011 | Toyota | Highlander | — | ELECTRIC/GAS | Downstream Left | OE Style |
| 2011 | Toyota | Highlander | — | — | Downstream | OE Style |
| 2010 | Lexus | RX350 | — | — | Downstream Right | OE Style |
| 2010 | Lexus | RX450h | — | — | Downstream Right | OE Style |
| 2010 | Toyota | Highlander | — | — | Downstream Right | OE Style |
| 2010 | Toyota | Highlander | — | — | Downstream | OE Style |
| 2009 | Lexus | RX350 | — | — | Downstream Right | OE Style |
| 2009 | Toyota | Highlander | — | — | Downstream Right | OE Style |
| 2009 | Toyota | Highlander | — | — | Downstream | OE Style |
| 2008 | Lexus | RX350 | — | — | Downstream Right | OE Style |
| 2008 | Toyota | Highlander | — | — | Downstream Right | OE Style |
| 2007 | Lexus | RX350 | — | — | Downstream Right | OE Style |
| 2007 | Toyota | Highlander | — | GAS | Downstream Right | OE Style |
| 2006 | Lexus | RX330 | — | — | Downstream Right | OE Style |
| 2006 | Toyota | Highlander | — | GAS | Downstream Right | OE Style |
| 2005 | Lexus | RX330 | — | — | Downstream Right | OE Style |
| 2005 | Toyota | Highlander | — | — | Downstream Right | OE Style |
| 2004 | Lexus | RX330 | — | — | Downstream Right | OE Style |
| 2004 | Toyota | Highlander | — | — | Downstream Right | OE Style |
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