Denso 234-4721 Oxygen Sensor - Upstream

Overview of Denso OE Style Oxygen Sensor 234-4721

The Denso OE Style Oxygen Sensor 234-4721 is designed specifically for Mazda Protege and Protege5 models. This heated oxygen sensor ensures accurate emissions control and optimal engine performance by monitoring exhaust gases precisely.

• Heated sensor type for faster response times
• Specific fit for Mazda Protege and Protege5
• Threaded mounting type with 0.708 inch thread diameter
• 9.45-inch wiring harness length with 4 wires
• Female connector for secure electrical connection

Detailed Features and Specifications

This oxygen sensor features a heated element that allows it to reach operating temperature quickly, improving fuel efficiency and reducing emissions. The 9.45-inch wiring harness length provides adequate reach for installation in the exhaust system of Mazda Protege and Protege5 vehicles. With a 0.708-inch threaded mounting type, it ensures a secure and proper fit. The sensor includes four wires and a female connector, designed for a specific fit rather than a universal application, which helps maintain factory-level performance and reliability.

About the Denso OE Style Product Line

The Denso OE Style line focuses on delivering parts that meet original equipment specifications. This oxygen sensor is engineered to match the exact fit and function of the factory-installed sensor in Mazda Protege and Protege5 models. The OE Style line emphasizes compatibility and quality, providing a direct replacement that supports proper emissions control and engine management systems.

Common Applications and Issues Addressed

• Restores accurate oxygen sensing for proper air-fuel mixture
• Helps resolve check engine light codes related to oxygen sensors
• Improves fuel economy by ensuring efficient combustion
• Reduces harmful emissions by maintaining proper sensor function
• Prevents engine performance issues caused by faulty sensors

Installation Notes and Tips

When installing the Denso 234-4721 oxygen sensor, ensure the vehicle is cool to avoid burns. Use appropriate tools to remove the old sensor and avoid damaging the wiring harness. Confirm the female connector matches the vehicle’s harness for a secure connection. Thread the sensor carefully to avoid cross-threading and tighten to manufacturer torque specifications.

Quality Assurance and Warranty

Denso OE Style oxygen sensors are 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. Using this sensor helps maintain compliance with emissions regulations and supports long-term vehicle operation.