Denso 234-5038 Air / Fuel Ratio Sensor

Denso OE Style Air/Fuel Ratio Sensor 234-5038

Denso 234-5038 is an OE Style heated air/fuel ratio sensor built for exact replacement and first-time fit. It is engineered for specific applications across Ford, Lincoln, Mazda, and Mercury vehicles, including upstream sensor locations on popular models such as the Ford Explorer, Ford F-150, and Mazda CX-9.

The OE Style line focuses on direct-fit replacement parts that match factory requirements for sensor performance, connector layout, and installation dimensions. For buyers searching for an upstream air fuel ratio sensor for Ford Explorer or a replacement oxygen sensor-style air/fuel sensor for Lincoln MKZ and Mazda 6 applications, this part number is built to the correct specification.

Key Features

• Heated air/fuel ratio sensor for precise exhaust feedback
• Specific fit design for direct replacement applications
• 5-wire configuration with male connector
• Wiring harness length: 11.57
• Thread diameter: 0.711
• OE Style construction for factory-style fit and function
• Cross-reference part numbers include Motorcraft DY1140 and NTK 24387

Detailed Description

Denso 234-5038 is designed for upstream sensor positions where accurate air-fuel monitoring is critical to engine management. It is a heated sensor with a 5-wire layout and a specific-fit connector, helping maintain the correct signal response for vehicles that rely on precise exhaust data. This part is listed for a wide range of Ford, Lincoln, Mazda, and Mercury applications, including 2011-2015 Ford Explorer, 2013-2016 Lincoln MKZ, and 2011-2013 Mazda 6.

Denso’s OE Style product line is built around factory-style replacement standards, with components precision-built to match the original part dimensions and connection points. That makes Denso 234-5038 a practical choice when replacing an upstream air/fuel ratio sensor on Ford F-150, Ford Edge, Lincoln MKX, or Mazda CX-9 applications.

What This Sensor Helps Address

• Check engine light related to air/fuel ratio sensor performance
• Rough idle caused by inaccurate exhaust feedback
• Fuel trim issues from a slow or faulty upstream sensor
• Emissions test failures tied to sensor response problems
• Poor drivability from incorrect air-fuel mixture data

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for upstream, upstream right, upstream left, upstream rear, and upstream front applications depending on vehicle. Confirm connector style, wire count, and thread diameter against the original sensor before installation. For fitment searches, this part is commonly referenced for Fits 2011-2015 Ford Explorer, upstream; Fits 2013-2016 Lincoln MKZ, upstream; and Fits 2011-2013 Mazda 6, upstream.

Additional fitment includes Fits 2011-2014 Ford F-150, upstream; Fits 2011-2015 Lincoln MKX, upstream; and Fits 2011-2015 Mazda CX-9, upstream. This part number, 234-5038, also appears in replacement searches for Ford Edge, Ford Fusion, Lincoln MKS, Lincoln MKT, Mercury Milan, and Mercury Mariner applications.

Quality Assurance

Denso manufactures and tests these sensors to OE standards, with attention to exact replacement fit and consistent component quality. The OE Style line is intended to deliver the correct part and the correct fit for the listed applications the first time.