Denso 234-5091 Air / Fuel Ratio Sensor - Upstream, Upstream Left or Upstream Right

Overview of the Denso OE Style Air/Fuel Ratio Sensor 234-5091

The Denso OE Style Air/Fuel Ratio Sensor 234-5091 is designed for precise emission control in select Dodge and Mercedes-Benz vehicles. This heated sensor ensures accurate air/fuel mixture readings to support optimal engine performance and emissions compliance.

• Heated sensor type for faster response times
• Specific fit for Dodge and Mercedes-Benz models including C230, E350, and SLK350
• 31.50-inch wiring harness length for proper 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 234-5091 air/fuel ratio sensor is engineered to meet the exact specifications of the original equipment it replaces. Featuring a heated sensor element, it quickly reaches operating temperature to provide accurate oxygen level readings. The 31.50-inch wiring harness length and five-wire setup with a male connector ensure compatibility and ease of installation in specific Dodge and Mercedes-Benz models such as the C280, CLS63 AMG, and Sprinter 3500. The sensor’s 0.711-inch thread diameter allows for a secure and proper fit, maintaining the integrity of the vehicle’s emission control system.

OE Style Product Line Information

The Denso OE Style product line focuses on delivering parts that closely replicate the original equipment manufacturer’s design and performance. This air/fuel ratio sensor from the OE Style line is built to provide consistent and reliable operation, matching the fit and function of the factory-installed sensor. It is intended for applications where maintaining original vehicle specifications is critical.

Common Applications and Issues Addressed

• Restores accurate air/fuel mixture readings for improved engine efficiency
• Resolves check engine light triggers related to oxygen sensor faults
• Helps reduce emissions by ensuring proper sensor operation
• Prevents rough idling and poor fuel economy caused by faulty sensors
• Supports proper catalytic converter function by providing correct sensor data

Installation Notes and Tips

• Verify vehicle compatibility with the specific fitment list before installation
• Handle the sensor carefully to avoid damage to the heated element and wiring
• Use appropriate tools to avoid damaging the 0.711-inch threaded mounting
• Ensure the male connector is securely attached to the vehicle’s wiring harness
• Follow manufacturer torque specifications when installing the sensor

Quality Assurance and Warranty

Denso air/fuel ratio sensors, including part number 234-5091, are manufactured to meet strict quality standards. The OE Style line ensures that each sensor undergoes rigorous testing for durability and performance. While specific warranty details may vary, Denso typically offers coverage against defects in materials and workmanship to provide confidence in the product’s reliability.