Denso 234-3019 Oxygen Sensor - Upstream

OE-Style Heated Oxygen Sensor

Denso 234-3019 is an OE Style heated oxygen sensor built for specific-fit replacement on select Audi, Jaguar, and Volvo applications. It uses a 3-wire, threaded design with a 38.82 in. wiring harness and a male/female connector layout for direct replacement service.

For drivers searching for an upstream oxygen sensor for a 1995-1997 Audi S6, 1992-1994 Audi S4, or 1991-1993 Volvo 940, this Denso oxygen sensor is built to match the original configuration and mounting style.

Key Features

• Specific-fit oxygen sensor for OE-style replacement
• Heated sensor design for faster operating response
• 3-wire construction with male/female connector
• Threaded mounting type with 0.708 in. thread diameter
• 38.82 in. wiring harness length
• Built to strict OE standards for replacement accuracy
• Uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination

Product Details

Denso OE Style oxygen sensor 234-3019 is engineered for exact replacement on confirmed upstream applications. The sensor is designed to restore accurate exhaust-gas feedback to the engine control system, which is critical for fuel control, emissions monitoring, and drivability. This part cross-references Bosch 13313 and NTK 25034 for the same application.

Compatible With select Audi S4 and S6 models, Jaguar Vanden Plas, XJ6, XJ12, XJS, and XJRS applications, plus Volvo 740, 745, 760, 780, and 940 upstream positions. The Denso 234-3019 is a direct-fit option for buyers who need the correct connector, thread size, and harness length without modification.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough idle or hesitation tied to sensor signal degradation
• Emissions test failures linked to a worn upstream sensor

Installation Notes and Tips

Verify the vehicle’s year, make, model, and upstream position before ordering. This part is a specific-fit threaded sensor, so confirm connector style, harness length, and thread diameter against the original unit. For best results, inspect the exhaust bung threads and wiring routing during installation on Audi, Jaguar, and Volvo applications.

Quality Assurance

Denso manufactures and tests this sensor to OE standards for fit and function. The OE Style line is built as a direct replacement solution, with attention to first-time fit and long-term sensor protection through the aluminum oxide trap layer.