Denso 234-4805 Oxygen Sensor - Downstream Right

Denso OE Style Oxygen Sensor for Toyota 4Runner

Denso 234-4805 is an OE Style heated oxygen sensor built for direct replacement on select Toyota applications. It is engineered for the 2003-2004 Toyota 4Runner in the downstream right position, with a specific fit and threaded mounting for accurate installation and reliable exhaust monitoring.

The Denso OE Style line focuses on exact replacement fitment and OE-level construction. This oxygen sensor uses a 4-wire heated design, a male connector, and a 7.87-inch wiring harness length to match the original layout on the vehicle. Denso also incorporates an aluminum oxide trap layer to help protect the sensing element from silicone and lead contamination, supporting stable engine management and consistent fuel control.

Key Features

• OE Style replacement oxygen sensor for select Toyota 4Runner models
• Fits 2003-2004 Toyota 4Runner, downstream right
• Heated sensor design for faster operating temperature
• Specific fit for direct replacement applications
• 4-wire configuration with male connector
• Threaded mounting type with 0.708-inch thread diameter
• 7.87-inch wiring harness length
• Denso part number 234-4805

Detailed Description

Denso 234-4805 is built as an OE-style oxygen sensor for drivers needing a direct-fit replacement on the Toyota 4Runner. This sensor is designed for the downstream right location on 2003-2004 Toyota 4Runner models, helping maintain proper exhaust feedback to the engine control system. If you are searching for a Toyota 4Runner downstream right oxygen sensor or a Denso 234-4805 replacement, this part matches the specified application and connector style.

The sensor’s heated design helps it reach operating temperature quickly, which supports more consistent signal output during normal driving. Denso’s precision-built construction is intended to mirror original equipment dimensions and connection points, reducing fitment issues during replacement. This part cross-references Toyota 8946560230 for the same application.

Common Issues This Part 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 inaccurate exhaust feedback
• Slow sensor response after extended service life
• Corrosion or connector wear at the original sensor location

Installation Notes and Tips

Confirm the vehicle is a 2003-2004 Toyota 4Runner with the downstream right sensor location before ordering. Match the 4-wire connector, threaded mounting style, and harness length to the original part. Inspect the exhaust bung threads and connector condition before installation, and verify the sensor routing follows the factory path to avoid strain on the harness.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for direct replacement use. The OE Style product line is built for first-time fitment and consistent performance, with contamination-resistant sensor protection designed to support long service life.