Denso 234-4163 Oxygen Sensor - Downstream

Denso 234-4163 Oxygen Sensor for Toyota Sienna

Denso 234-4163 is an OE-style heated oxygen sensor built for exact replacement and first-time fit. It is engineered for the downstream position on 2001-2003 Toyota Sienna models, with the correct 4-wire configuration and 11.81-inch wiring harness length.

For drivers searching for a downstream oxygen sensor for 2001-2003 Toyota Sienna, this Denso part is built to match the original application and restore accurate exhaust feedback. The OE-style design supports proper engine management and helps maintain fuel economy and emissions performance.

Key Features

• OE Style replacement oxygen sensor for direct-fit service
• Heated sensor design for faster operating response
• Specific fit for the downstream location
• 4-wire configuration for the listed application
• 11.81-inch wiring harness length
• Built and tested to strict OE standards

Product Details

Denso 234-4163 is part of Denso’s OE Style line, which focuses on replacement parts that match original equipment fit and function. This oxygen sensor uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable sensor performance over time. It is a direct replacement for the downstream oxygen sensor on Toyota Sienna models from 2001 through 2003.

This part cross-references Bosch 13566 and NTK 24689 for the same application. It is also listed as a replacement for Toyota 8946509290.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings from a worn downstream sensor
• Reduced fuel economy caused by inaccurate exhaust feedback
• Emissions test failures tied to sensor response issues
• Rough or inconsistent engine management data from a failing OE sensor

Installation Notes

Verify the downstream sensor location before ordering and compare the connector, wire count, and harness length to the original part. For 2001-2003 Toyota Sienna applications, this sensor is a specific-fit replacement, so matching the OE-style configuration is important for proper installation and operation.

Use the vehicle year and position details to confirm the correct application: Fits 2001-2003 Toyota Sienna, downstream.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent fit and performance. The OE-style design is intended to provide the right part and the right fit for the listed Toyota Sienna applications.