Denso 234-4859 Oxygen Sensor - Downstream or Upstream

Denso OE Style Oxygen Sensor 234-4859

Denso 234-4859 is an OE Style heated oxygen sensor built for direct replacement on select Audi and Volkswagen applications. It is engineered for exact fitment, stable signal output, and reliable exhaust monitoring on downstream and upstream positions where specified.

The OE Style line from Denso focuses on factory-style fit and consistent performance. This sensor uses a threaded mounting design, a male connector, 4-wire construction, and a 28.94-inch wiring harness length to match the original application requirements.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit design for direct replacement applications
• 4-wire configuration with male connector
• Threaded mounting type with 0.708-inch thread diameter
• 28.94-inch wiring harness length for OE-style routing
• Built to Denso OE standards for replacement accuracy
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Product Details

Denso 234-4859 is designed for drivers and technicians replacing a worn oxygen sensor on Audi TT, Audi TT Quattro, Audi Allroad Quattro, Audi A6 Quattro, Volkswagen Beetle, Volkswagen Golf, and Volkswagen Jetta applications. It supports exhaust feedback monitoring for vehicles that need a direct-fit OE-style sensor in upstream or downstream locations, depending on the vehicle listing.

This part cross-references Bosch 16132 and NTK 25604 for the same application. If you are searching for an oxygen sensor for a 2006-2010 Volkswagen Beetle downstream, a 2004-2005 Volkswagen Jetta downstream, or a 2002-2005 Audi Allroad Quattro upstream, this Denso replacement matches the listed fitment requirements.

What This Oxygen Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from a failing sensor
• Reduced fuel economy caused by slow or inaccurate exhaust readings
• Rough idle or drivability issues tied to sensor degradation
• Emissions test failures caused by a worn upstream or downstream sensor

Installation Notes and Tips

Verify the vehicle position before ordering, since fitment includes both upstream and downstream applications. Confirm connector style, wire count, and harness length against the original sensor before installation. Threaded mounting and OE-style routing help support a direct replacement on listed Audi and Volkswagen models.

Fits 2006-2010 Volkswagen Beetle, downstream; 2005 Volkswagen Beetle, downstream; 1998-2001 Volkswagen Beetle, downstream; 1999-2001 Volkswagen Golf, downstream; 1999-2001 Volkswagen Jetta, downstream; 2004-2005 Volkswagen Jetta, downstream; 2000-2001 Audi TT, downstream; 2000-2002 Audi TT Quattro, upstream; 2000-2001 Audi TT Quattro, downstream; 2001 Audi TT Quattro, downstream; 2002-2004 Audi A6 Quattro, upstream; 2002-2005 Audi Allroad Quattro, upstream; 2002-2006 Audi TT Quattro, downstream; 2000 Audi TT Quattro, downstream.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and first-time fit. The OE Style design is intended to deliver the correct part and fit for the listed applications, with contamination resistance built into the sensor element protection layer.