Denso 234-4403 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Reliable Oxygen Sensor for Ford, Lincoln, Mazda, and Mercury Vehicles

The Denso OE Style Oxygen Sensor 234-4403 is designed to provide precise emissions control for specific Ford, Lincoln, Mazda, and Mercury models. This heated oxygen sensor ensures accurate air-fuel mixture readings to help maintain optimal engine performance and reduce emissions.

• Heated sensor type for faster response times
• Specific fit for select Ford, Lincoln, Mazda, and Mercury vehicles
• 15.35-inch wiring harness length for proper installation
• Four-wire design with male connector for secure connection
• Threaded mounting type with 0.708-inch thread diameter

About the Denso OE Style Product Line

The OE Style line from Denso focuses on delivering parts that meet original equipment specifications. The 234-4403 oxygen sensor is engineered to match the fit, form, and function of the factory-installed sensor, ensuring compatibility and reliable performance in your vehicle’s emission control system.

Detailed Product Description

This Denso oxygen sensor features a heated sensor element that allows it to reach operating temperature quickly, improving fuel efficiency and reducing harmful emissions. The 15.35-inch wiring harness length provides flexibility during installation, while the four-wire configuration supports both the sensor signal and heater circuit. Designed with a male connector and a threaded mounting type with a 0.708-inch diameter, this sensor is a direct replacement for specific models including Ford B3000, B4000, E-350 Super Duty, Expedition, Explorer, Explorer Sport, Explorer Sport Trac, Mountaineer, Navigator, and Ranger, as well as compatible Lincoln, Mazda, and Mercury vehicles.

Common Applications and Issues Addressed

• Restores accurate oxygen sensing for proper air-fuel mixture
• Helps resolve rough idling and poor fuel economy
• Reduces emissions-related check engine light triggers
• Improves engine performance and drivability
• Prevents failed emissions tests due to faulty sensors

Installation Notes and Tips

Ensure the vehicle is cool before removing the old sensor to avoid burns. Use a proper oxygen sensor socket for removal and installation to prevent damage. Verify the connector gender and wire count match the vehicle harness before installation. Torque the sensor to manufacturer specifications to ensure a proper seal and avoid exhaust leaks.

Quality Assurance and Warranty

Denso OE Style oxygen sensors are manufactured to meet strict quality standards and original equipment specifications. The 234-4403 part number undergoes rigorous testing to ensure durability and reliable performance. Warranty coverage details should be confirmed with the original parts provider or vehicle manufacturer.