Bosch 0445120027 Fuel Injector

Bosch Common Rail Injector for GM Diesel Applications

Bosch 0445120027 is a new common rail fuel injector built for direct injection diesel systems. It is an OE-style replacement for 2004-2005 Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500, GMC Sierra 2500 HD, and GMC Sierra 3500 diesel applications that require precise fuel delivery and emissions-compliant operation.

As part of Bosch’s Common Rail Injector (New) line, this injector reflects Bosch’s OE-focused diesel fuel system engineering and updated component specifications. The Bosch 0445120027 is built to match original equipment test standards and is intended for drivers restoring injector performance on Silverado and Sierra heavy-duty diesel trucks.

Key Features

• Direct injection diesel fuel injector for common rail systems
• OE plug type for factory-style electrical connection
• Premium replacement grade for service and repair use
• Lower injector O-ring included
• Combustion chamber seal ring pre-assembled at the injector on listed OE applications
• Built to OE test specifications for fuel delivery consistency
• Supports emissions-compliant operation when installed on the correct application

Detailed Description

This Bosch fuel injector is engineered for 2004-2005 Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500, GMC Sierra 2500 HD, and GMC Sierra 3500 diesel trucks with common rail injection. Bosch 0445120027 is a direct injection component that helps restore accurate atomization and fuel metering in high-pressure diesel systems. The Bosch Common Rail Injector (New) line uses updated component specifications and end-of-line testing based on original equipment standards, making it a practical OE replacement for diesel fuel system repair.

This part cross-references 97303657 for the same application.

What It Helps Address

• Hard starting caused by worn or inconsistent injector performance
• Rough idle from uneven fuel delivery
• Excessive smoke related to poor atomization
• Loss of power from restricted or inaccurate injection
• Check engine concerns tied to injector circuit or fuel delivery faults

Installation Notes and Tips

Verify engine and injector application before installation. This injector is listed for one-per-cylinder use on the specified Chevrolet Silverado and GMC Sierra diesel models. Follow factory service procedures for common rail diesel systems, including proper cleaning of the injector bore, inspection of sealing surfaces, and correct torque sequence during reassembly. Confirm the OE plug connection and seal condition before final installation.

Quality Assurance

Bosch manufactures diesel fuel system components to OE-level specifications and tests each unit against original equipment standards. This injector carries a 12-month unlimited miles/unlimited hours warranty for non-commercial use.