Denso 234-4414 Oxygen Sensor - Downstream or Downstream Right

Denso OE Style Oxygen Sensor for Audi

Denso 234-4414 is an OE Style heated oxygen sensor built for direct replacement on select Audi applications. It is engineered for a specific fit, with a threaded mounting design, 4-wire connector layout, and a 28.35-inch wiring harness for clean integration on the vehicle.

For drivers searching for an Audi A4 Quattro downstream right oxygen sensor or an Audi A6 Quattro downstream oxygen sensor, this Denso part number 234-4414 is built to match the original sensor style and connection requirements.

Key Features

• Heated oxygen sensor for precise exhaust monitoring
• Specific fit design for direct replacement
• 4-wire configuration with male connector
• Threaded mounting type with 0.708-inch thread diameter
• 28.35-inch wiring harness length
• OE Style construction for select Audi downstream applications

OE Style Construction

Denso’s OE Style line is built to the same dimensional and performance expectations used in original equipment service. The sensor element is protected by Denso’s aluminum oxide trap layer, which helps shield the ceramic element from silicone and lead contamination. That design supports stable sensor response, consistent engine management feedback, improved fuel efficiency, and longer service life in demanding exhaust conditions.

This part cross-references Bosch 15157 and NTK 25083 for the same application.

What This Sensor Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect downstream exhaust feedback on Audi A4, A4 Quattro, A6, A6 Quattro, and Q7 applications
• Fuel trim issues caused by a worn or slow-responding sensor
• Emissions test failures tied to sensor signal degradation
• Rough drivability caused by inaccurate exhaust oxygen readings

Fitment and Installation Notes

• Fits 2011-2015 Audi Q7, downstream right.
• Fits 2005-2011 Audi A6 Quattro, downstream.
• Fits 2007-2009 Audi A4 Quattro, downstream right.
• Fits 2006-2009 Audi A6, downstream.
• Fits 2007-2008 Audi A4, downstream right.
• Fits 2006 Audi A4, downstream right, from chassis #8E-6-035 001.
• Fits 2006 Audi A4 Quattro, downstream right, from chassis #8E-6-035 001.

Confirm the connector style, wire routing, and downstream right or downstream location before installation. Use the vehicle’s original sensor placement and thread specification to verify the correct Audi oxygen sensor replacement. Denso 234-4414 is intended for direct replacement on the listed applications and should be installed with care to avoid damage to the sensing element or threads.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for fit, function, and durability. The OE Style design and contamination-resistant sensor protection reflect Denso’s focus on consistent replacement performance for Audi emissions control systems.