Denso 234-4413 Oxygen Sensor - Downstream or Downstream Left

Denso OE Style Oxygen Sensor 234-4413

Denso 234-4413 is an OE Style heated oxygen sensor built for exact replacement and first-time fit. It is engineered for downstream monitoring on select Audi applications, including Audi A4, Audi A4 Quattro, Audi A6, and Audi A6 Quattro models.

The OE Style line is designed around factory-style fitment and sensor performance. This Denso oxygen sensor uses a threaded mounting design, a male connector, 4-wire configuration, and a 23.27-inch wiring harness length for direct replacement on the listed vehicles.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific fit design for the listed Audi applications
• Threaded mounting type for OE-style installation
• 4-wire configuration with male connector
• 23.27-inch wiring harness length
• 0.708-inch thread diameter
• Built to strict OE standards for replacement fit and function

Product Details

Denso 234-4413 is part of the OE Style product line, which focuses on factory-matched replacement parts for vehicles that require precise sensor response and correct connector and harness layout. The sensor is manufactured and tested to OE-level standards, and Denso uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination. That protection supports stable engine management performance, fuel efficiency, and long service life.

This part cross-references Bosch 15158 and NTK 25079 for the same application. It is a direct-fit oxygen sensor for downstream positions on 2005-2011 Audi A6 Quattro, 2006-2009 Audi A6, 2007-2009 Audi A4 Quattro, 2007-2008 Audi A4, and 2006 Audi A4/A4 Quattro from chassis #8E-6-035 001.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect downstream air-fuel ratio feedback
• Reduced fuel economy caused by a failing sensor
• Slow or inaccurate exhaust monitoring response
• Driveability issues tied to aged or contaminated sensors

Installation Notes

Verify the connector style, wire count, thread diameter, and harness length before installation. This sensor is a specific-fit replacement for downstream left or downstream applications listed above, so confirm the exact position on the vehicle before ordering. Use the vehicle’s chassis note where applicable, especially on 2006 Audi A4 and A4 Quattro models from chassis #8E-6-035 001.

Quality Assurance

Denso manufactures this OE Style oxygen sensor to strict original-equipment standards and tests each component for replacement accuracy and fit. The design is intended to deliver the correct part and the correct fit for the listed Audi A4, Audi A4 Quattro, Audi A6, and Audi A6 Quattro applications.