Denso 234-5174 Air / Fuel Ratio Sensor - Upstream or Upstream Left

Denso OE Style Air/Fuel Ratio Sensor

The Denso 234-5174 is an OE Style heated air/fuel ratio sensor built for direct replacement on select Ford and Lincoln applications. It is engineered for specific fitment, accurate connector alignment, and a first-time fit on vehicles such as the Ford F-150, Ford Expedition, Ford GT, Ford Escape, and Lincoln Navigator.

Denso’s OE Style line focuses on exact replacement parts that follow strict original-equipment standards. For buyers searching for a Ford F-150 upstream left air/fuel ratio sensor or a Lincoln Navigator upstream left replacement sensor, this part number 234-5174 is built to match the application and installation points listed below.

Key Features

• Heated air/fuel ratio sensor for faster operating readiness
• Specific fit design for direct replacement applications
• 5-wire configuration with male connector
• 19.80 in. wiring harness length
• Thread diameter: 0.708 in.
• OE Style construction for exact replacement fitment

Detailed Description

The Denso 234-5174 air/fuel ratio sensor is manufactured and tested to OE-level standards for consistent signal performance and proper fit. It is a specific-fit sensor designed for upstream left and upstream locations on select Ford and Lincoln vehicles, including 2015-2020 Ford F-150, 2018 and 2019 Ford Expedition, 2020-2022 Ford Expedition, 2021-2023 Lincoln Navigator, 2017-2019 Ford Escape, and 2017-2022 Ford GT applications listed in the fitment data. This part cross-references Ford E1GZ9F472B for the same application.

The OE Style product line is intended for buyers who want a direct replacement sensor that follows the original configuration closely. If you are replacing a Ford Expedition upstream left sensor or a Ford GT upstream sensor, Denso 234-5174 is built to match the required position and connector style without modification.

What It 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 failing upstream sensor
• Emissions test failures tied to sensor response problems
• Poor drivability from incorrect air/fuel mixture readings

Installation Notes and Tips

• Verify the exact year, make, model, and sensor position before ordering.
• Confirm upstream left or upstream placement matches the vehicle listing.
• Inspect the connector, harness length, and thread size before installation.
• Use proper sensor removal tools to avoid damaging the exhaust bung or wiring.
• Clear diagnostic trouble codes after installation and verify live data operation.

Quality Assurance

Denso manufactures this sensor to strict OE standards and tests each component for replacement accuracy and fit. The OE Style line is built for direct application matching, and the part number 234-5174 is supported by interchange references including NTK 24334 and Walker Products 250-25025 / 350-35060.