Denso 234-4372 Oxygen Sensor - Upstream

Denso OE Style Oxygen Sensor 234-4372

Denso 234-4372 is an OE Style heated oxygen sensor built for direct replacement on select Ford, Lincoln, Mazda, and Mercury applications. It is engineered for a specific fit and uses a threaded mounting design for accurate installation and dependable exhaust monitoring.

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 in. thread diameter
• 10.63 in. wiring harness length
• OE Style construction for factory-style fit and function
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Product Details

This Denso oxygen sensor is manufactured and tested to OE standards for precise replacement fitment and consistent signal performance. The heated design helps the sensor reach operating temperature quickly, which supports accurate air-fuel feedback during engine operation. Denso 234-4372 is a direct-fit option for vehicles such as the 2010 Ford Fusion, 2007-2010 Lincoln MKZ, and 2007-2009 Ford Edge, along with other listed upstream applications.

The OE Style product line focuses on factory-like replacement parts with the correct connector, harness length, and mounting configuration. This helps reduce guesswork when replacing an upstream oxygen sensor on a Ford Fusion, Lincoln MKZ, or Mazda CX-9 application. This part cross-references Motorcraft DY1064 and Bosch 15755 for the same application.

Common Uses

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from the upstream sensor
• Reduced fuel economy caused by a failing heated oxygen sensor
• Rough idle or drivability issues tied to exhaust sensor data
• Contamination-related sensor degradation from silicone or lead exposure

Installation Notes

Verify the upstream position, connector style, wire count, and thread size before installation. This sensor uses a threaded mount and a male connector, so matching the original harness and exhaust bung is important for proper fit. Confirm vehicle-specific fitment for the exact year, make, and model before ordering, including Taurus, Taurus X, Sable, and MKX applications where notes specify exclusions.

Quality Assurance

Denso manufactures and tests this oxygen sensor to strict OE standards for replacement accuracy and long-term reliability. The design includes a protective trap layer intended to help preserve the sensing element under normal exhaust conditions.