Denso 234-5731 Air / Fuel Ratio Sensor - Upstream Left

Denso OE-Style Air/Fuel Ratio Sensor

Denso 234-5731 is a specific-fit, wide-band air/fuel ratio sensor built for direct replacement in emission control applications. It is engineered for the 2018-2020 Ford F-150 upstream left position, with OE-style fit and a 5-wire design for accurate signal delivery.

For buyers searching for a Ford F-150 upstream left air/fuel ratio sensor, Denso 234-5731 provides a direct-fit replacement solution that matches the original application. The Denso air/fuel ratio sensor line is built to OE standards, with precision construction aimed at first-time fit and consistent replacement performance.

Key Features

• Wide-band air/fuel ratio sensor for emission control service
• Specific fit for the upstream left location
• OE-style replacement for 2018-2020 Ford F-150 applications
• 5-wire sensor design
• 24.53 in. wiring harness length
• Standard replacement grade
• Part number 234-5731 for direct identification

Detailed Description

Denso 234-5731 is an OE-style air/fuel ratio sensor designed for the upstream left position on the 2018-2020 Ford F-150. As a wide-band sensor, it supports precise exhaust mixture monitoring for vehicles that rely on accurate feedback to the engine management system. The specific-fit design helps ensure the sensor matches the original mounting and connection requirements, while the 24.53-inch harness length and 5-wire configuration support proper integration in the intended application. If you need a Ford F-150 upstream left air/fuel ratio sensor replacement, this Denso part number 234-5731 is built for that exact service position.

This part cross-references Gates 27080 for the same application.

Common Issues This Sensor May Address

• Check engine light related to air/fuel ratio sensor performance
• Incorrect exhaust mixture readings reported to the engine control system
• Rough idle or drivability concerns tied to sensor signal errors
• Failed emissions inspection caused by sensor-related faults
• Need for a direct-fit replacement on the upstream left Ford F-150 location

Installation Notes and Tips

Confirm the upstream left position before installation and verify connector style, harness routing, and sensor length against the original part. For 2018-2020 Ford F-150 service, compare the old sensor to Denso 234-5731 before removal to ensure the correct OE-style replacement is selected. Clear diagnostic trouble codes after installation and verify system operation with a scan tool if required by the repair procedure.

Quality Assurance

Denso manufactures and tests this air/fuel ratio sensor to OE standards for exact replacement fit and consistent build quality. The Denso air/fuel ratio sensor product line is focused on direct replacement parts that match original equipment requirements for the intended vehicle application.