BMW 1 3 Series 1 E81 E87N LCI E90 E91 Air Filter Box Housing Diesel N47 7797460

BMW 1 3 Series 1 E81 E87N LCI E90 E91 Air Filter Box Housing Diesel N47 is an original intake system component designed for BMW 3 Series E90/E91 diesel engines. The robust construction of the housing ensures proper airflow to the filter, thereby maintaining stable operating conditions for the power unit. It is a practical solution for users seeking factory fitment and reliable compatibility with the intake system.

Specifications and technical data

• SKU: 7797460-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7797460
• Substitutable numbers: 13717797460, 7797460
• Fuel type: Diesel
• Category: Air Filters

Purpose and function in the intake system

The air filter housing in the diesel version is responsible for the airtight routing of the airflow to the filter element and subsequent intake components. A properly selected housing:

• stabilizes the airflow drawn in by the engine,
• limits the intake of contaminants from outside the filter,
• minimizes intake noise,
• supports the maintenance of correct operating parameters for the diesel unit.

Thanks to a design consistent with BMW factory standards, this component works with the stock intake system, sensors, and engine bay mounts, which facilitates installation and subsequent maintenance.

Benefits of using an original housing

Using an original air filter housing in a BMW E90/E91 with a diesel engine allows you to maintain the parameters specified by the vehicle manufacturer. Key advantages include:

• Factory geometric fitment – proper positioning relative to the filter, intake ducts, and body mounts.
• Compatibility with stock intake system components – no need for modifications or adaptations.
• Consistency with the original cooling and airflow concept in the engine bay.
• Trouble-free air filter replacement during standard service intervals.

For users who want to keep their car in a configuration close to factory specifications, such a housing is a safe and predictable service choice.

Characteristics of the used component

The presented housing comes from dismantling and has the status of a used part, which allows for a significant reduction in repair costs compared to a new OEM component. At the same time, the original manufacturer's specification is preserved, thanks to which:

• you maintain compliance with the factory intake system design,
• you reduce the risk of installation problems typical of low-quality replacements,
• you can economically restore the efficiency of the air filtration system after housing damage.

This solution is particularly beneficial when operating older BMW 3 Series vehicles, where it is important to combine reasonable costs with maintaining correct engine operating parameters.

Application in BMW diesel engines

The housing has been designed with the specifics of BMW diesel units in mind, where the intake system must ensure a sufficiently large and stable airflow under high loads. In practice, this means:

• adaptation to the operating characteristics of diesel engines (high boost pressures, large masses of intake air),
• proper routing of air to the filter and further to the turbocharger,
• maintaining system airtightness, which is important for the operation of air mass and boost pressure measurement systems.

As a result, the housing supports the maintenance of stable combustion parameters, which translates into refinement, performance, and fuel consumption.

Support with selection and additional information

The component has a dedicated OEM part number and associated interchangeable numbers, which facilitates precise verification of compatibility with a specific engine version and model year of the BMW 3 Series. In case of doubt, it is worth comparing the markings with the vehicle documentation or consulting a mechanic to ensure that the housing will work properly with the existing intake system.

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

For older models, where the availability of new components can be limited, aftermarket solutions can be particularly useful – you can find more on this topic in the article No parts at the dealership? How to deal with repairing older models using dismantled parts.