Bosch 0445117021 Fuel Injector

Bosch Common Rail Injector for OE Diesel Performance

The Bosch 0445117021 common rail injector is a premium replacement fuel injector for diesel direct injection systems. Built to OE specifications and tested at the end of the production line, it supports original-equipment fuel delivery performance and emissions compliance.

Compatible with 2014 Audi A8 Quattro and 2013 Volkswagen Touareg diesel applications, this Bosch common rail injector is a direct-injection OE-style replacement for precise fuel metering and consistent combustion.

Key Features

• Bosch Common Rail Injector (New) for diesel direct injection systems
• OE plug type for factory-style electrical connection
• Premium replacement grade for OE-level service fitment
• Factory-tested to OE specifications at the end of the production line
• Built with updated components and current Bosch specifications
• Includes one lower injector O-ring
• Interchange reference: 059130277CD

Product Details

Bosch is a major original equipment supplier of diesel fuel system components for passenger cars, SUVs, vans, and light trucks. The 0445117021 injector is part of Bosch’s Common Rail Injector (New) line, which focuses on direct-injection diesel fuel delivery with OE-level calibration and component updates. This part number, 0445117021, is specified for 2014 Audi A8 Quattro and 2013 Volkswagen Touareg diesel applications where the injector is installed at the cylinder level.

This Bosch 0445117021 fuel injector is intended for drivers and technicians replacing a worn, leaking, or electrically inconsistent diesel injector in OE-equipped common rail systems. It supports accurate atomization and fuel delivery control for smoother combustion and proper engine operation.

Common Issues This Injector Can Address

• Hard starting caused by poor diesel fuel delivery
• Rough idle from inconsistent injector spray or metering
• Excessive smoke related to injector performance loss
• Fuel leakage at the injector sealing interface
• Check engine lights tied to injector circuit or fueling faults

Installation Notes and Tips

Verify engine code, injector calibration requirements, and OE connector style before installation. The injector uses an OE plug type and is a direct injection component, so clean sealing surfaces and correct torque procedures are important for proper sealing and operation. For 2014 Audi A8 Quattro and 2013 Volkswagen Touareg diesel applications, confirm cylinder-specific placement and follow factory service information during replacement.

Quality Assurance

This Bosch common rail injector is tested to exact OE end-of-line specifications and built with the latest component updates and specifications. Warranty coverage is 12 months with unlimited miles and unlimited hours for non-commercial use.