Audi A4 S4 8K A5 S5 8T Turbocharger Part Housing 2.0 TDI Diesel CJCA 03L145721A

Audi A4 S4 8K A5 S5 8T Turbocharger Part Housing 2.0 TDI Diesel CJCA is an original component from the Turbochargers and parts group, designed for Audi diesel engines. This used housing provides a solid base for professional turbocharger remanufacturing or precise repair of the forced induction system in 2.0 TDI CJCA units, ensuring a proper fit to the factory design.

Specifications and technical data

• SKU: 03L145721A-2
• Mark: Audi
• Condition: Used
• OEM Part Number: 03L145721A
• Substitutable numbers: 03L145721A, 03L 145 721 A
• Fuel type: Diesel
• Part type: Turbocharger
• Category: Turbos & Parts

Purpose and compatibility

The presented turbocharger housing has been designed for Audi A4 / S4 8K and Audi A5 / S5 8T models equipped with the 2.0 TDI diesel engine with the CJCA code. By maintaining the factory body geometry and mounting points, the component allows for correct exhaust gas flow and stable seating of the turbo core, which is crucial for the durability of the entire forced induction system.

Technical characteristics of the housing

The turbocharger housing acts as a support for the rotor and bearing system, while simultaneously shaping the exhaust gas flow towards the turbine. In 2.0 TDI CJCA units running on Diesel fuel, the body must withstand high temperatures and pressure loads, which is why its geometric condition has a direct impact on tightness, turbo spool speed, and boost pressure stability.

A used housing from dismantling is a good solution in situations where the original body has cracked, deformed, or suffered from excessive thermal corrosion, and repairing the existing component is not cost-effective. Replacing the housing alone often allows for saving a functional turbocharger core and reducing repair costs while maintaining factory specifications.

Application in the Diesel forced induction system

In Audi 2.0 TDI CJCA diesel engines, the turbocharger is responsible for achieving the appropriate torque across a wide rev range, and the housing is one of the key elements determining flow characteristics. A correctly selected body:

• ensures stable exhaust gas flow to the turbine blades,
• reduces energy losses in the exhaust system,
• facilitates the maintenance of proper boost pressure,
• promotes smooth operation of the diesel engine under load.

Thanks to the preservation of the original housing design, it is possible to maintain the factory operating parameters of the powertrain without the need for software modifications or changes to other auxiliary components.

Benefits of using an original used housing

Choosing a used turbocharger housing from an Audi dismantling is a solution that allows for cost control while maintaining factory-quality fitment. An original body from the same engine family:

• facilitates installation without modifying mounts or lines,
• ensures compatibility with the exhaust and intake systems,
• allows for the use of the existing turbo core, if its condition permits.

For workshops specializing in turbocharger remanufacturing and for users who care about the technical integrity of their vehicle, using an original housing is often more predictable than installing a replacement with uncertain geometry.

Expanding repairs within the turbocharger

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

When planning your budget for forced induction system service, it is also worth learning about the broader context of using original parts from dismantling in premium class cars – this is discussed in detail in the article: Servicing Porsche cars: how to reduce repair costs by choosing only original used parts?.