Denso 234-5085 Air / Fuel Ratio Sensor - Upstream, Upstream Left or Upstream Right

Overview of the Denso OE Style Air/Fuel Ratio Sensor

The Denso OE Style Air/Fuel Ratio Sensor 234-5085 is designed specifically for select Mercedes-Benz and Smart vehicles. 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 Mercedes-Benz and Smart models
• 16.61-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

This Denso Air/Fuel Ratio Sensor (part number 234-5085) is engineered to meet the exact specifications of your vehicle’s original equipment. Featuring a heated sensor element, it quickly reaches operating temperature to provide accurate oxygen level readings. The 16.61-inch wiring harness length and five-wire setup with a male connector ensure compatibility and ease of installation on specific Mercedes-Benz AMG GT, C-Class, E-Class, GLS, GLE, Maybach, and Smart models. The 0.711-inch thread diameter allows for a secure and proper fit, maintaining the integrity of your 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 is part of that line, providing a direct replacement that maintains factory standards for fit, function, and durability. Choosing the OE Style sensor helps ensure your Mercedes-Benz or Smart vehicle continues to meet emission requirements and engine management expectations.

Common Applications and Issues Addressed

• Restores accurate air/fuel mixture readings for improved fuel efficiency
• Resolves check engine light triggers related to oxygen sensor faults
• Helps reduce emissions by maintaining proper combustion control
• Prevents rough idling and engine hesitation caused by faulty sensors
• Supports optimal performance in Mercedes-Benz AMG GT, C300, E350, GLS550, and Smart Fortwo models

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 type and wire count match the original sensor before installation
• Check wiring harness length (16.61 inches) for proper routing and connection
• Follow manufacturer torque specifications to secure the sensor

Quality Assurance and Warranty

Denso OE Style sensors are manufactured to meet strict quality standards, ensuring reliable performance and durability. This air/fuel ratio sensor undergoes rigorous testing to comply with emission control requirements. While specific warranty details may vary, Denso products typically include coverage against defects in materials and workmanship to provide confidence in your replacement part.