Air Filter Box Mercedes ML W164 W219 Diesel Housing Cover A6420940304

Air Filter Box Mercedes ML W164 W219 Diesel Housing Cover is a factory-original intake system component designed for diesel engines of this series. It ensures stable mounting of the filter element and proper airflow to the power unit. Thanks to its design tailored to the specific model, it guarantees proper cooperation with engine accessories and maintains factory performance parameters.

Specifications and technical data

• SKU: A6420940304
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420940304
• Substitutable numbers: A6420940304, A 642 094 03 04, 45 021 35 907
• Location on the vehicle: Right
• Fuel type: Diesel
• Category: Air Filter Housings

Purpose and function in the intake system

The described cover belongs to the Air filter housings category and is responsible for tightly sealing the filter chamber and directing the airflow sucked in by the diesel engine. Its placement on the right side of the engine bay allows for optimal routing of intake ducts and convenient service access during filter element replacement.

Precise fitment to the engine bay design in ML W164 and W219 models reduces the risk of leaks that could lead to the intake of contaminants before the filter. As a result, the intake system maintains proper airtightness, and the power unit operates under stable conditions, which promotes the maintenance of proper operating culture and combustion parameters.

Benefits of using the original housing

Using the original air filter housing in Mercedes diesel vehicles allows for the preservation of factory airflow geometry. This is significant both for the operation of the mass air flow sensor and for the correct functioning of engine control systems. The cover design has been developed to ensure:

• stable seating of the air filter element in the intended position,
• proper airflow to the intake manifold,
• reduction of turbulence and unwanted pressure drops in the intake,
• consistency with factory mounts and adjacent components in the engine bay.

Thanks to this, installation is straightforward, without the need for modifications or the use of additional adapters. This solution is particularly beneficial for servicing premium-class cars, where maintaining the original design concept is a priority.

Installation and operational characteristics

The housing has been designed for installation on the right side of the vehicle, which facilitates access during service work on the intake system. The construction is intended for use with diesel engines, which is why the geometry of the air channels is adapted to the specifics of diesel units, including their air demand under various loads.

The part comes from dismantling, which in practice means it is a component with proven compatibility with the given vehicle platform. Choosing such a solution reduces the risk of fitment issues typical of aftermarket parts with universal designs. This is particularly important in the case of Mercedes cars, where precision of component fitment in the engine bay has a direct impact on service comfort and equipment durability.

Use in service and repairs

The air filter housing cover is suitable both for standard replacement of a damaged part and for comprehensive rebuilding of the intake system in ML W164 and W219 diesel models. It can be used as a replacement part in situations where the existing housing has cracked, deformed, or lost its seal due to wear or mechanical interference.

Selecting the correct housing is important not only for protecting the engine from contaminants but also for maintaining the correct operation of sensors and control elements. In premium vehicles such as Mercedes, consistent use of solutions compliant with factory specifications promotes long-term, predictable operation and facilitates future diagnostics.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as additional covers, lower housing parts, or air intake ducts, check out the available parts in the Mercedes air filter housings category.

Why choose used originals

In the case of premium-class cars, choosing a used, original air filter housing is often more rational than investing in a cheaper aftermarket part of uncertain quality. You receive a component designed specifically for a given model, maintaining factory tolerances and design solutions. This approach allows for optimizing service costs while maintaining a high level of reliability.

If you want to learn more about the arguments for using used components in premium segment cars, it is worth reading the material: Crisis in the new parts market? Why used originals for premium cars (BMW, Mercedes, Porsche) are the hottest trend in 2026. You will find practical tips there on how to consciously choose components and plan repairs based on original parts.