Audi A4 B8 A5 8T A6 C7 Turbocharger Housing Cover 2.0 TDI 03L145721B

Audi A4 B8 A5 8T A6 C7 Turbocharger Housing Cover is an original part from the Turbochargers and parts group, designed for the forced induction system in Audi diesel engines. The cover is a precision-fitted turbo housing component that supports the proper operation of the compressor, system tightness, and stable flow of exhaust gases and air.

Specifications and technical data

• SKU: 03L145721B-4
• Mark: Audi
• Condition: Used
• OEM Part Number: 03L145721B
• Substitutable numbers: 03L145721B, 03L 145 721 B
• Part type: Turbo Coupler
• Category: Turbos & Parts

Purpose and function in the forced induction system

The turbocharger housing cover in a 2.0 TDI engine is responsible for the stable sealing of the turbo body section and the proper guidance of the working medium within the compressor. Thanks to its factory-fit design for Audi A4 B8, A5 8T, and A6 C7 units, it ensures:

• maintenance of the turbocharger housing's design geometry,
• proper fitment with adjacent forced induction system components,
• reduction of leaks and unwanted pressure losses,
• maintenance of stable operating conditions for the rotor and turbo body.

Original origin and installation compatibility

As an Audi brand component, the turbocharger housing cover has been designed in accordance with the manufacturer's factory standards. This ensures:

• original geometry of mounts and bolt points,
• compatibility with factory turbocharger equipment,
• material consistency with other forced induction system components. As a result, the part can be used as a replacement for a damaged cover in vehicles with a 2.0 TDI engine, without the need for turbo construction modifications or additional component adjustments.

Performance characteristics of the used part

The cover comes from the original used parts segment, which allows for combining factory fitment with cost-effective repairs. In practice, this means:

• maintenance of the original manufacturer's specifications regarding shape and mounts,
• possibility of an economical replacement for a damaged or deformed cover,
• reduction of the risk of installation problems typical of cheap aftermarket replacements. This is a particularly attractive solution for maintenance repairs, where it is crucial to maintain the proper operation of the turbocharger without excessively increasing the service budget.

Benefits of using an original turbocharger cover

Using this cover in the Audi A4 B8, A5 8T, or A6 C7 forced induction system allows for maintaining the structural integrity of the entire turbocharger. The main advantages include:

• factory fitment – no need for modifications, drilling, or grinding,
• stable cooperation with other turbo components,
• reduction of the risk of leaks and improper exhaust gas flow,
• possibility of using the part as a component during turbocharger regeneration. For workshops and individual users, this means predictable installation and maintaining the forced induction system's operating parameters at a level close to factory standards.

Expanding the forced induction system in Audi

If you are planning a comprehensive repair or upgrade of your Audi's engine area and need other elements from the same group, such as bodies, covers, or additional turbo components, check out the available parts in the Audi Turbochargers and parts category.

Expert support and service cost optimization

When planning powertrain repairs, it is worth considering the impact of original used parts on the total cost of vehicle ownership. If you want to better understand how to approach the service of a VAG group car economically and why original second-hand components are often the most cost-effective choice, read the article: Economical operation of Skoda cars: why original used parts are the best choice for your wallet?