Mercedes W166 W204 OM651 Diesel Air Filter Box Housing A6510902001

Mercedes W166 W204 OM651 Diesel Air Filter Box Housing is an original intake system component designed for OM651 diesel engines in Mercedes W166 and W204 models. It ensures stable mounting of the filter element, proper airflow to the engine, and effective separation of contaminants, which translates into efficient engine operation and reduces the risk of premature component wear. Thanks to its factory design, the housing is precisely matched to the intake system in diesel-powered vehicles.

Specifications and technical data

• SKU: A6510902001
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6510902001
• Substitutable numbers: A6510902001, A 651 090 20 01
• Fuel type: Diesel
• Category: Air Filter Housings

Purpose and function in the intake system

The air filter housing in the OM651 diesel engine is responsible for the airtight routing of air from the intake to the intake manifold and for the stable seating of the filter element. In Mercedes W166 and W204 vehicles, this is of particular importance due to the engine's high requirements regarding air purity and uniform cylinder filling.

A properly selected housing:

• maintains the correct geometry of the intake ducts,
• minimizes pressure drops in the airflow,
• ensures airtight connections with intake hoses and sensors,
• protects the filter element against deformation and improper seating.

Benefits of using an original air filter housing

Using a factory housing in the intake system of a Mercedes diesel engine allows you to maintain the parameters specified by the vehicle manufacturer. This is especially important in OM651 units, where precise air metering affects engine refinement, performance, and exhaust emissions.

Key advantages include:

• Compatibility with the intake system – the housing is designed for specific body and engine variants, which facilitates installation and eliminates the need for modifications.
• Stable filtration conditions – a correctly seated air filter element operates under intended flow conditions, which supports effective air purification.
• Reduced risk of leaks – factory mounts and seals reduce the chance of unfiltered air entering the engine.
• Consistency with other intake components – the housing works with standard hoses, sensors, and mounts in the engine bay.

Performance characteristics of the used component

The presented air filter housing is a secondary market component, which allows for optimizing service costs while maintaining a design consistent with the factory solution. A used component of this type is particularly attractive for post-accident repairs, replacement after mechanical damage, or restoring a vehicle to OEM configuration after previous modifications.

In practice, this means the ability to:

• restore the standard routing of intake ducts after replacing a damaged housing,
• retain original mounting points in the engine bay,
• reduce the risk of fitment issues typical of universal aftermarket replacements.

Selection and application in Mercedes vehicles

The housing is designed for intake systems in Mercedes vehicles with the OM651 diesel engine, particularly in the W166 and W204 body series. When selecting the component, it is crucial to compare the housing design, the layout of ports, mounts, and the routing of intake hoses with the solution used in your specific vehicle.

It is worth paying attention to:

• the compatibility of the housing shape with the engine bay layout,
• the placement of mounting points to the body and brackets,
• fitment for the intended type of air filter element.

Intake system expansion and technical knowledge

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 housings, intake ducts, or air supply hoses, check out the available parts in the Mercedes Air Filter Housings category.

If you want to better plan your purchases of used components – from engine parts to small mounting accessories – and understand how to effectively source original parts in one place, it is worth reading the guide Comprehensive supply: from the engine to the smallest clip – how to source used car parts in one place?, which discusses a practical approach to choosing used parts and avoiding problematic replacements.