Ford Focus St-3 Mk2 Air Filter Housing Box Cover 4613785901

Ford Focus St-3 Mk2 Air Filter Housing Box Cover is a component from the Air filter housings category, designed for use in the sports version of the second-generation Ford Focus ST-3. It is responsible for the stable mounting of the filter element and the correct routing of intake air, which is crucial for the engine's performance and durability. This used OEM component is a sensible choice for intake system maintenance when you prioritize factory geometry and fitment.

Specifications and technical data

• SKU: 4613785901
• Mark: Ford
• Condition: Used
• OEM Part Number: 4613785901
• Substitutable numbers: 4613785901
• Part type: Air Filter Housing
• Category: Air Filter Housings

Purpose and function in the intake system

The air filter housing in the ST-3 MK2 version is responsible for tightly sealing the filter element and directing the airflow into the engine. A properly selected housing:

• ensures stable seating of the air filter in the engine bay,
• limits the ingress of contaminants into subsequent intake components,
• maintains the proper airflow required by the engine,
• minimizes the risk of leaks at the connection points with intake ducts. By maintaining the original design, the intake system operates in a predictable manner, which facilitates vehicle diagnostics and maintenance.

Advantages of using an original housing

Choosing an original Ford air filter housing allows you to maintain factory flow parameters and fitment with other engine bay components. In practice, this means:

• secure fitment with factory mounts and ducts,
• no modifications required during installation,
• preservation of the stock intake system acoustics,
• easier maintenance when replacing the filter element. A used OEM part is a compromise between cost and maintaining the design intended by the vehicle manufacturer, which is particularly important in high-performance versions such as the ST-3.

Condition, fitment, and installation aspects

The offered housing comes from the used Ford parts segment, which allows for an economical repair of the intake system while maintaining original specifications. The component is intended for direct installation in the appropriate body and engine version of the Focus MK2 ST-3, utilizing factory mounting points. Before installation, it is recommended to perform a standard check of tightness, the condition of seals, and the contact surfaces with intake ducts and the filter element. A properly installed housing reduces the risk of sucking in contaminants and unwanted vibrations, which translates into stable engine operation.

Ford air filter housings – expansion and maintenance of the intake system

If you are planning a comprehensive repair or upgrade of the engine area in your Ford and need other components from the same group, such as intake ducts, air supply hoses, or additional mounting elements, check the available parts in the Ford air filter housings category.

Support in selecting used parts

When selecting used components for popular and premium car brands, correct fitment based on the model version and technical parameters is key. If you want to better understand how to use vehicle data for precise component selection, the article describing how to work with the VIN number and original parts may be helpful – check the material: How to select original used parts for BMW, Audi, and Mercedes using the VIN number?.

Summary

Ford Focus St-3 Mk2 Air Filter Housing Box Cover is a practical solution for users who want to restore the proper operation of the intake system while maintaining the factory design. A used OEM element from the Air filter housings group allows for a technically correct repair without interfering with the intake geometry and while maintaining compatibility with other engine components.