Denso 234-5137 Air / Fuel Ratio Sensor - Upstream

Overview of the Denso OE Style Air/Fuel Ratio Sensor

The Denso OE Style Air/Fuel Ratio Sensor 234-5137 is designed specifically for select BMW models, including the 325Ci, 325i, 330Ci, 330i, 525i, 530i, and X3. This heated sensor ensures accurate air and fuel mixture readings to support optimal engine performance and emissions control.

• Heated sensor type for faster response times
• Specific fit for BMW 325Ci, 325i, 330Ci, 330i, 525i, 530i, and X3 models
• 38.66-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 standard OE replacement

Detailed Product Description

The Denso OE Style Air/Fuel Ratio Sensor 234-5137 is engineered to meet original equipment specifications for BMW vehicles. 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 38.66-inch wiring harness, allowing for proper routing and connection within the engine bay. Its five-wire design and male connector ensure compatibility with the vehicle’s existing wiring harness. The 0.711-inch thread diameter allows for a secure and precise fit, maintaining the integrity of the emission control system.

The OE Style product line from Denso focuses on delivering parts that closely match the original equipment in form, fit, and function. This ensures that the 234-5137 sensor integrates seamlessly with the vehicle’s emission system, supporting compliance with emission standards and maintaining engine efficiency.

Common Applications and Issues Addressed

• Helps correct inaccurate air/fuel mixture readings
• Resolves rough idling and poor engine performance
• Reduces increased emissions and failed emissions tests
• Addresses check engine light triggers related to oxygen sensor faults
• Improves fuel economy by optimizing combustion

Installation Notes and Tips

• Ensure the vehicle is cool before sensor removal to avoid burns
• Use appropriate tools to avoid damaging the 0.711-inch threaded sensor
• Verify connector gender and wire count for proper electrical connection
• Follow BMW-specific service manual instructions for sensor replacement
• Check for any wiring harness damage before installation

Quality Assurance and Warranty

Denso’s OE Style Air/Fuel Ratio Sensor 234-5137 is manufactured to meet strict quality standards, ensuring reliable performance and durability. While specific warranty details may vary, Denso typically offers coverage against defects in materials and workmanship. This sensor is designed to maintain the emission control system’s integrity and support long-term vehicle operation.