Denso 234-4255 Oxygen Sensor - Downstream

Reliable Oxygen Sensor for Chevrolet, Pontiac, and Saturn Vehicles

The Denso OE Style Oxygen Sensor 234-4255 is designed to provide precise emissions control for select Chevrolet, Pontiac, and Saturn models. This heated oxygen sensor ensures accurate air-fuel mixture readings, helping maintain optimal engine performance and emissions compliance.

• Heated sensor type for faster response times
• Specific fit for Chevrolet Aura, Equinox, Malibu, Montana; Pontiac G6, Torrent; Saturn Vue, Uplander
• 14.76-inch wiring harness length for proper installation
• Four-wire design with female 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 234-4255 oxygen sensor is engineered to match factory fit and function, ensuring compatibility and reliable performance in emission control systems. This line is ideal for technicians and vehicle owners seeking a direct replacement part that aligns with manufacturer standards.

Detailed Product Description

This Denso oxygen sensor features a heated element to reduce warm-up time, allowing the sensor to provide accurate readings shortly after engine start. The 14.76-inch wiring harness length and four-wire configuration with a female connector facilitate straightforward installation and secure electrical connections. The threaded mounting type with a 0.708-inch diameter ensures a proper seal and fit in the exhaust system. Designed specifically for certain Chevrolet, Pontiac, and Saturn models, this sensor supports efficient engine management and emissions control.

Common Applications and Issues Addressed

• Restores accurate air-fuel ratio readings for improved fuel efficiency
• Helps resolve check engine light triggers related to oxygen sensor faults
• Reduces emissions by ensuring proper catalytic converter function
• Prevents rough idling and engine performance issues caused by faulty sensors
• Supports compliance with emissions testing requirements

Installation Notes and Tips

Before installation, verify compatibility with your vehicle’s make and model, including Chevrolet Aura, Equinox, Malibu, Montana; Pontiac G6, Torrent; and Saturn Vue, Uplander. Use appropriate tools to remove the old sensor and avoid damaging the wiring harness. Ensure the threaded mounting is tightened to manufacturer torque specifications to prevent exhaust leaks. The four-wire female connector should be securely attached to maintain sensor functionality.

Quality Assurance and Warranty

Denso OE Style oxygen sensors are manufactured to meet strict quality standards and original equipment specifications. While specific warranty details may vary, Denso parts typically come with a limited warranty covering defects in materials and workmanship. Using this sensor helps maintain your vehicle’s emission control system integrity and supports long-term engine performance.