Denso 234-4821 Oxygen Sensor - Downstream or Upstream

Reliable Oxygen Sensor for Select GM and Saab Models

The Denso OE Style Oxygen Sensor 234-4821 is designed to provide precise emissions control for specific Buick, Cadillac, Chevrolet, Pontiac, Saab, and Saturn vehicles. This heated oxygen sensor ensures accurate air-fuel mixture readings to maintain optimal engine performance and reduce emissions.

• Heated sensor type for faster response times
• Specific fit for select Buick, Cadillac, Chevrolet, Pontiac, Saab, and Saturn models
• 15.79-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 offers direct replacement parts engineered to meet original equipment specifications. The 234-4821 oxygen sensor is part of this line, ensuring compatibility and reliable performance for vehicles requiring a specific fit. This product line focuses on delivering components that match factory standards for fit, form, and function.

Product Details and Specifications

This oxygen sensor features a heated element to reduce warm-up time, improving sensor accuracy shortly after engine start. The 15.79-inch wiring harness length allows for proper routing and connection within the engine bay. With four wires and a female connector, the sensor integrates seamlessly with the vehicle’s existing wiring harness. The threaded mounting type with a 0.708-inch diameter ensures a secure and leak-free installation.

Compatible Vehicles and Applications

• Buick Rendezvous, Encore, and Vue
• Cadillac CTS and SRX
• Chevrolet G8 and Express 2500
• Pontiac G8
• Saab 9-3, 9-4X, and 9-5
• Saturn Vue

Common Issues Addressed by This Oxygen Sensor

• Check engine light triggered by faulty oxygen sensor readings
• Poor fuel economy due to incorrect air-fuel mixture
• Increased emissions and failed emissions tests
• Engine hesitation or rough idling
• Reduced engine performance and drivability issues

Installation Notes and Tips

Ensure the engine is cool before removing the old oxygen 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’s harness before installation. Thread the sensor carefully to avoid cross-threading and torque to manufacturer specifications.

Quality Assurance and Warranty

Denso OE Style oxygen sensors are manufactured to meet strict quality standards and original equipment specifications. The 234-4821 part number undergoes rigorous testing to ensure durability and reliable performance. Warranty coverage details should be confirmed with the supplier or manufacturer.