Denso 234-4694 Oxygen Sensor - Upstream

Denso OE Style Oxygen Sensor for Discovery

Denso 234-4694 is a heated, specific-fit oxygen sensor built for OE-style replacement on the 1999-2004 Land Rover Discovery, upstream. It is engineered for exact fitment and consistent signal performance in emissions control applications.

The OE Style line focuses on direct replacement fit and factory-style integration. For Land Rover Discovery owners, that means a sensor designed around the original mounting and connector layout, with the right harness length and thread specification for the application.

Key Features

• Specific-fit oxygen sensor for direct replacement
• Heated sensor design for faster operating temperature
• 4-wire configuration with female connector
• Threaded mounting type with 0.708 in. thread diameter
• 12.60 in. wiring harness length
• OE Style replacement for 1999-2004 Land Rover Discovery upstream applications

Product Details

Denso 234-4694 is manufactured to OE standards and precision-built for first-time fitment. It uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management and emissions performance over time. This part cross-references Bosch 15175 and NTK 25623 for the same application.

Fits 1999-2004 Land Rover Discovery, upstream. Fits 1999-2004 Land Rover Discovery, upstream. The Denso OE Style design is intended to match the original sensor location and electrical connection used on this vehicle platform.

What It Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect air-fuel mixture readings from a worn upstream sensor
• Reduced fuel economy caused by slow or inaccurate sensor response
• Emissions test failures tied to sensor degradation
• Driveability issues linked to contaminated or aging sensor elements

Installation Notes and Tips

Confirm the upstream position and connector style before installation. Match the 4-wire female connector, threaded mounting, and harness length to the original sensor on the Land Rover Discovery. Inspect the exhaust bung threads and wiring routing before tightening the sensor to avoid cross-threading or harness strain.

Quality Assurance

Denso manufactures and tests this oxygen sensor to strict OE standards for fit, function, and durability. The OE Style line is built for direct replacement applications, including the 1999-2004 Land Rover Discovery upstream sensor location.