Denso 234-4879 Oxygen Sensor - Downstream or Downstream Left

Denso OE Style Oxygen Sensor 234-4879

Denso 234-4879 is an OE Style heated oxygen sensor built for direct replacement on select Porsche applications. It is engineered for specific fitment, threaded mounting, and a 4-wire female connector to match the original sensor layout on compatible Porsche 911 and Macan models.

Denso’s OE Style line focuses on exact replacement fit and factory-level construction. This oxygen sensor uses a precision-built design with an aluminum oxide trap layer that helps protect the ceramic element from silicone and lead contamination, supporting stable engine operation and long service life.

Key Features

• Part number: 234-4879
• Heated oxygen sensor for emissions control systems
• Specific fit design for direct replacement
• 4-wire configuration with female connector
• Threaded mounting type with 0.708 in. thread diameter
• Wiring harness length: 26.69 in.
• OE Style construction for factory-matched replacement

Detailed Description

This Denso oxygen sensor is designed for downstream monitoring on Porsche 911 and Porsche Macan applications listed below. It is a direct-fit replacement for vehicles that require the same connector style, thread size, and heated sensor configuration. The OE Style design supports accurate installation on the first attempt and helps restore proper exhaust feedback for the engine management system. Cross-reference part numbers include Bosch 16057 and NTK 25696 for the same application.

Compatible With: 2019 Porsche 911, downstream; 2014-2017 Porsche 911, downstream; 2011 Porsche 911, downstream; 2006-2009 Porsche 911, downstream; 2015-2018 Porsche Macan, downstream left.

What It Helps Address

• Fault codes related to oxygen sensor performance
• Incorrect air-fuel mixture readings from a worn sensor
• Reduced fuel economy caused by inaccurate exhaust feedback
• Slow sensor response during closed-loop engine operation
• Emissions test failures tied to downstream sensor issues

Installation Notes and Tips

Verify the connector, wire count, thread diameter, and sensor position before installation. This part is specific fit, so it should be matched to the exact downstream or downstream-left location shown in the fitment data. Inspect the harness routing and exhaust threads before installing the sensor to avoid damage during service.

Quality Assurance

Denso manufactures and tests this sensor to OE standards for replacement accuracy and consistent performance. The OE Style line is built for exact fitment and dependable operation in emissions control service.