Denso 234-5755 Air / Fuel Ratio Sensor - Upstream or Upstream Left

OE-style air/fuel ratio sensor

This Denso air/fuel ratio sensor is a specific-fit, standard replacement part built to OE standards for accurate signal control. It is engineered for applications that require a wide-band sensor with a female connector and a 5-wire design.

Fits 2020-2024 Ford Explorer, upstream; fits 2021-2024 Ford Bronco Sport, upstream; and fits 2020-2023 Lincoln Corsair, upstream. It also fits additional Ford applications including Escape, Maverick, F-250 Super Duty, and F-350 Super Duty in the listed upstream positions. Part number 234-5755 is the reference to verify before ordering.

Key features

• OE-style replacement built to strict factory standards
• Wide-band sensor type for precise air/fuel monitoring
• Specific-fit design for direct application matching
• Standard replacement grade for service use
• Female connector with 5-wire configuration
• 11.811 harness length for application-specific routing

Detailed description

Denso 234-5755 is an OE-style air/fuel ratio sensor for Ford and Lincoln applications that require an upstream wide-band sensor. The part is precision-built and tested to match factory expectations for fit and function, helping maintain accurate feedback to the engine management system. Use part number 234-5755 when confirming the correct sensor for Ford Bronco Sport, Ford Escape, Ford Explorer, Ford Maverick, Ford F-250 Super Duty, Ford F-350 Super Duty, and Lincoln Corsair applications.

The Denso Air / Fuel Ratio Sensor - OE Style line focuses on direct replacement parts that follow OE standards and application-specific fitment. That makes this sensor a practical choice when replacing a worn or faulty upstream sensor on a Ford Explorer or Lincoln Corsair, or when servicing other listed Ford models with the same OE-style requirement.

Common issues this part can address

• Check engine light related to air/fuel sensor performance
• Rough idle caused by inaccurate mixture feedback
• Reduced fuel control from a failing upstream sensor
• Driveability concerns tied to slow or inconsistent sensor response
• Emissions faults triggered by sensor signal errors

Installation notes and tips

Confirm the upstream position and match the connector, wire count, and harness length before installation. Verify fitment by vehicle year, make, model, and engine application where required, and compare the old sensor to part number 234-5755 before replacement. This part cross-references Monroe Shocks & Struts (e.g., KX6Z9F472B, L1MZ9F472E) for the same application.

Quality assurance

Denso states that this sensor is manufactured and tested to strict OE standards and built for exact replacement fitment. That OE-style approach supports consistent installation and dependable service on the listed Ford and Lincoln applications.