Denso 234-5140 Air / Fuel Ratio Sensor - Upstream

Overview of the Denso OE Style Air/Fuel Ratio Sensor 234-5140

The Denso OE Style Air/Fuel Ratio Sensor 234-5140 is designed specifically for select BMW models, including the 335d, 535d, 535d xDrive, M5, M6, and X5. This heated sensor ensures accurate air and fuel mixture readings to maintain optimal engine performance and emissions control.

• Heated sensor type for faster response times
• Specific fit for BMW diesel and performance models
• 23.46-inch wiring harness length for precise installation
• Five-wire configuration with male connector
• Thread diameter of 0.711 inches for secure mounting
• Regular grade type for reliable operation

Detailed Product Description

The Denso OE Style Air/Fuel Ratio Sensor 234-5140 is engineered to meet the exact specifications of BMW vehicles such as the 335d, 535d, 535d xDrive, M5, M6, and X5. Featuring a heated sensor element, it provides quicker warm-up times and more accurate air/fuel mixture readings under various operating conditions. The sensor includes a 23.46-inch wiring harness with five wires and a male connector, ensuring compatibility with the vehicle’s existing electrical system. Its 0.711-inch thread diameter allows for a secure and precise fit, maintaining the integrity of the emission control system.

This sensor is part of Denso's OE Style product line, which focuses on delivering components that closely replicate original equipment specifications. The OE Style line is designed to provide a balance between quality and cost-effectiveness, making it suitable for professional repairs and maintenance on BMW vehicles requiring specific fitment parts.

Common Applications and Issues Addressed

• Restores accurate air/fuel ratio readings for improved engine efficiency
• Helps resolve rough idling and poor acceleration caused by faulty sensors
• Reduces emissions by ensuring proper combustion control
• Prevents check engine light triggers related to air/fuel sensor faults
• Supports optimal performance in BMW diesel and high-performance models

Installation Notes and Tips

When installing the Denso 234-5140 air/fuel ratio sensor, ensure the wiring harness length of 23.46 inches is sufficient for your vehicle’s routing requirements. The male connector and five-wire setup should match the factory harness for a plug-and-play installation. Use appropriate tools to avoid damaging the 0.711-inch threaded sensor during mounting. It is recommended to follow BMW-specific service procedures to avoid sensor or engine control module errors.

Quality Assurance and Warranty

Denso manufactures the OE Style 234-5140 sensor to meet stringent quality standards, ensuring reliable performance and durability. While specific warranty details are not provided here, Denso products typically come with manufacturer-backed warranties covering defects in materials and workmanship. This sensor is designed to maintain emission compliance and support long-term vehicle operation.