Denso 234-5711 Air / Fuel Ratio Sensor - Downstream Left or Upstream

Denso OE Style Air/Fuel Ratio Sensor

Denso 234-5711 is an OE Style heated air/fuel ratio sensor built for direct replacement on select BMW applications. It is precision-built and tested to OE standards for accurate fitment, with a specific-fit design that helps simplify replacement on the correct upstream or downstream left location.

Compatible With BMW 230i, 330i, 430i, 530i, 530e, 740e xDrive, X3, and X4 applications listed below, this sensor is a practical choice when you need a direct-fit air/fuel ratio sensor for BMW engine management service. The Denso 234-5711 also cross-references BMW 11788631047 and NTK 27083 for the same application.

Key Features

• OE Style replacement air/fuel ratio sensor for select BMW models
• Heated sensor design for faster operating readiness
• Specific fit for direct replacement on listed applications
• 5-wire configuration with male connector
• Wiring harness length: 21.93
• Thread diameter: 0.697

Detailed Product Information

Denso 234-5711 is engineered as an OE-style emission control sensor for precise signal feedback to the engine control system. The sensor is manufactured and tested to strict OE standards, and its exact-replacement design supports first-time fit on the listed BMW vehicles. This part is used in upstream positions on most applications shown, with one listed downstream left application for the 2020 BMW 430i xDrive Gran Coupe.

Fitment includes 2021 BMW 230i and 230i xDrive, 2020 BMW 430i, 430i Gran Coupe, and 430i xDrive, 2018-2020 BMW 530e and 530e xDrive, 2017-2019 BMW 330i, 330i GT xDrive, 330i xDrive, 430i, 430i Gran Coupe, 430i xDrive, 430i xDrive Gran Coupe, 530i, 530i xDrive, and 740e xDrive, plus 2018-2019 BMW X3, 2019 BMW X4, 2016-2018 BMW 330e, and 2017 BMW 740Le xDrive.

What This Sensor Helps Address

• Check engine light related to air/fuel ratio sensor performance
• Rough idle or unstable fuel mixture feedback
• Reduced fuel control accuracy from a failing upstream sensor
• Emission system fault codes tied to sensor response or heater circuit issues
• Incorrect air/fuel monitoring on BMW turbo and hybrid applications

Installation Notes and Tips

Confirm the sensor position before ordering, since this part is listed for upstream use on most applications and downstream left use on the 2020 BMW 430i xDrive Gran Coupe. Verify connector style, wire count, and thread diameter against the original sensor before installation. Use the vehicle service information for torque and routing guidance, and inspect the harness path to avoid heat or abrasion damage.

Quality Assurance

Denso manufactures this OE Style sensor to strict original-equipment standards and tests each component for replacement accuracy and fit. The brand’s OE-focused design approach supports dependable service on the listed BMW applications, including 230i, 330i, 430i, 530i, and X3 models.