Mini Cooper One D R55 R56 Diesel W16 Throttle Body Housing Valve Flap 25352157

Mini Cooper One D R55 R56 Diesel W16 Throttle Body Housing Valve Flap is an original intake system component designed for Mini diesel engines, ensuring precise control over the amount of intake air. Thanks to its factory OEM design, the throttle body maintains full compatibility with the vehicle's electronics and engine control unit maps. This is a practical solution for users looking for a proven, used part with stable operating parameters.

Specifications and technical data

• SKU: 7794978
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 7794978
• Substitutable numbers: 13547794978, 7794978, 25352157, 9686487880
• Fuel type: Diesel
• Category: Throttle Bodies

Purpose and function in the intake system

The throttle body in a Mini diesel engine is responsible for controlling airflow in the intake manifold, working in conjunction with the engine control system and other auxiliary components. A properly functioning unit of this type contributes to stable idle speed, smooth transitions between loads, and the correct operation of emission control systems.

In the case of symptoms such as fluctuating idle, loss of dynamics, or ECU errors related to airflow, replacing it with a functional, original throttle body is one of the fundamental diagnostic and repair steps. Using an OEM part allows for maintaining the factory performance characteristics of the powertrain.

Benefits of using an original Mini throttle body

Choosing a used OEM throttle body for the Mini One D R55/R56 is a solution that combines controlled costs with the preservation of factory build quality. Designed specifically for Mini diesel engines, this component ensures:

• Proper mechanical fitment to the intake manifold and factory mounts.
• Full integration with the original engine control unit and wiring harness.
• Operating characteristics consistent with the vehicle manufacturer's specifications.
• Reduced risk of adaptation issues compared to generic aftermarket replacements.

As a result, the throttle body can be used both for standard replacement of a damaged part and for repairs related to the intake and exhaust emission systems in diesel engines.

Condition, verification, and application in diesel engines

The offered throttle body comes from the Throttle Bodies group and is intended for diesel-powered engines. The used nature of the part allows for economical repair while maintaining the original design and materials used by the Mini manufacturer. Before installation, it is recommended to perform a standard cleaning procedure for the intake channels and to adapt the component according to the service recommendations for the specific model.

During replacement, it is worth paying attention to the condition of the seals, the correct connection of electrical plugs, and the tightness of the connections in the intake system. A properly installed throttle body supports the smooth operation of the diesel engine, which translates into refinement and predictable throttle response.

Integration with other Mini intake system components

The throttle body works with the intake manifold, exhaust gas recirculation (EGR) system, air pressure and temperature sensors, and the engine control unit. In the case of extensive intake system repairs, it is worth considering a comprehensive diagnosis of these sub-assemblies to avoid the recurrence of faults related to airflow and the air-fuel mixture in the diesel engine.

If you are planning a comprehensive repair or upgrade of the engine area in your Mini and need other items from the same group, such as throttle bodies, actuators, or motorized housings, check out the available parts in the Mini Throttle Bodies category.

Why choose used OEM components

Using original used parts is often a reasonable compromise between cost and durability, especially for components like throttle bodies that must work with advanced control electronics. Factory Mini components are designed for long-term operation, and their reuse in good technical condition allows for maintaining predictable powertrain operating parameters.

If you are interested in a broader context regarding the selection of used original components in the drivetrain, it is worth reading our guide: Whining differential? Find out why a used OEM drive axle is a better investment than an uncertain replacement. Although it concerns a different sub-assembly, it well illustrates the advantages of using proven OEM parts instead of random replacements.