Bosch 15901 Oxygen Sensor - Downstream or Downstream Left

Reliable Oxygen Sensor for Chevrolet and GMC Trucks

The Bosch Engineered Oxygen Sensor 15901 is designed to provide accurate air-fuel mixture readings for specific Chevrolet, GMC, Pontiac, and Saturn models. This narrow-band heated oxygen sensor ensures optimal engine performance and emission control for heavy-duty trucks and SUVs.

• Specific fit for Chevrolet Silverado 1500 HD, 2500 HD, 3500 HD, and GMC Sierra HD models
• Heated narrow-band oxygen sensor with 4-wire design for precise readings
• Threaded mounting type with 18 mm thread diameter and 22 mm hex size
• Includes 19.1-inch wiring harness with a square female connector
• Durable metal housing finished in steel for long-lasting use

About the Bosch Engineered Oxygen Sensor Line

The Bosch Engineered Oxygen Sensor line focuses on delivering reliable emission control components tailored to specific vehicle applications. This product line emphasizes precise sensor technology and durable construction, ensuring compatibility and performance for targeted models like the Chevrolet Silverado and GMC Sierra series. The 15901 sensor is part of this line, offering a standard replacement option with a heated narrow-band sensor design.

Product Details and Specifications

This oxygen sensor features a 4-wire configuration with female pin terminals and a square-shaped connector, facilitating secure electrical connections. The sensor’s overall length is 22.8 inches, with a wiring harness length of 19.1 inches and a sealing surface to connector length of 21.7 inches. Its threaded mounting type (18 mm diameter) allows for straightforward installation in compatible exhaust systems. The sensor is heated to provide faster response times and improved accuracy in monitoring exhaust gases.

Common Applications and Issues Addressed

• Restores accurate air-fuel ratio readings for Chevrolet Silverado 2500 HD and GMC Sierra 3500 HD
• Helps resolve engine performance issues related to faulty oxygen sensors
• Reduces emissions by ensuring proper sensor feedback to the engine control unit
• Prevents check engine light triggers caused by sensor malfunctions
• Improves fuel efficiency by maintaining optimal combustion conditions

Installation Notes and Tips

Ensure the vehicle is cool before beginning installation to avoid burns. Use a 22 mm oxygen sensor socket for removal and installation. Verify the sensor’s wiring harness routing to prevent damage from heat or moving parts. This sensor is a specific fit for select Chevrolet, GMC, Pontiac, and Saturn models, so confirm compatibility with your vehicle’s year and engine type before installation.

Quality Assurance and Warranty

The Bosch Engineered Oxygen Sensor 15901 is manufactured with metal housing and high-quality components to meet OEM standards. It is designed as a standard replacement part to maintain emission control system integrity. While specific warranty details are not provided here, Bosch products typically come with manufacturer-backed quality assurance to support reliable operation.