Denso 234-4878 Oxygen Sensor - Downstream or Downstream Right

Denso OE Style Oxygen Sensor 234-4878

Denso 234-4878 is an OE Style heated oxygen sensor built for direct replacement on select Porsche applications. It is engineered for a specific fit and uses a threaded mounting design with a female connector and 4-wire configuration for accurate installation on the intended downstream location.

For Porsche Macan, Cayenne, and 911 applications, this sensor is built to match the original equipment form and connection style. The Denso OE Style line focuses on exact replacement fitment, helping maintain proper exhaust feedback and consistent engine management performance.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific fit design for direct replacement applications
• 4-wire construction with female connector
• Threaded mounting type with 0.708 in. thread diameter
• 26.22 in. wiring harness length
• OE Style replacement from Denso

OE Style Replacement Design

Denso’s OE Style sensor line is built to the same standards used for original equipment service parts. The sensor is precision built for first-time fitment and uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination. That construction supports stable sensor operation and long service life in demanding exhaust environments. This part number, 234-4878, is a direct-fit solution for downstream sensor replacement on Porsche vehicles.

This part cross-references Bosch (e.g., 16205, 16962) for the same application.

Vehicle Fitment

• Fits 2015-2018 Porsche Macan, Downstream Right, OE Style
• Fits 2008-2010 Porsche Cayenne, Downstream, OE Style
• Fits 2001-2005 Porsche 911, Downstream, OE Style

Common Replacement Reasons

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel feedback from a worn downstream sensor
• Reduced fuel economy caused by aging exhaust sensors
• Slow or inaccurate sensor response during emissions monitoring
• Corrosion or connector damage at the original sensor location

Installation Notes

Confirm the vehicle year, model, and sensor position before ordering. This sensor is specific fit and threaded, so the connector style, wire count, and downstream location should match the original part. Verify the harness length and thread diameter against the removed sensor before installation on Porsche Macan, Cayenne, or 911 applications.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and consistent performance. The OE Style design is intended to provide the correct fit and electrical connection for the listed applications, including Porsche Macan, Cayenne, and 911 models.