Air Filter Mercedes W203 W211 Housing Engine Cover M112 Petrol A1120940004

Visual condition of the part 

The product shows signs of use visible in the photos. 

Air Filter Mercedes W203 W211 Housing Engine Cover M112 Petrol is a factory-original intake system component designed for petrol engines, mounted on the right side of the engine bay. It is responsible for securely seating the filter element and ensuring proper airflow, which promotes efficient engine operation and maintains correct combustion parameters. This used, original housing is an excellent choice for drivers and workshops seeking a component structurally matched to the M112 series.

Specifications and technical data

• SKU: A1120901101
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1120901101
• Substitutable numbers: A1120901101, A 112 090 11 01, A1120940004, A 112 094 00 04, KZ
• Location on the vehicle: Right
• Fuel type: Petrol
• Category: Air Filter Housings

Purpose and function in the intake system

The air filter housing in Mercedes W211 models with the M112 engine plays a key role in protecting the power unit from contaminants sucked in from the environment. The design, tailored to the petrol engine, ensures:

• stable mounting of the filter element in the position specified by the manufacturer,
• controlled airflow to the intake manifold,
• reduction of dust and fine particles entering the cylinders,
• compatibility with the standard intake equipment in the given model.

The placement on the right side of the vehicle allows for maintaining the original routing of the intake ducts and compatibility with factory mounts and covers.

Benefits of using an original housing

Using an original air filter housing in a Mercedes W211 with an M112 engine translates into a number of practical operational benefits. This series component was designed for the specific geometry of the engine bay, thanks to which it:

• ensures proper fitment with intake hoses and body mounts,
• minimizes the risk of leaks at the connection points with hoses and the filter element,
• maintains stable operating conditions for the mass air flow sensor and other intake system sensors,
• facilitates periodic maintenance related to filter element replacement.

For workshops and private users, this means trouble-free installation and predictable intake system behavior after replacing the component.

Installation and operational characteristics

The air filter housing designed for M112 petrol units has been developed to work with the standard mounting system and airflow routing on the right side of the vehicle. In practice, this translates into:

• the possibility of installation in place of the factory component without interfering with the body structure,
• preservation of the original intake duct routing,
• easy service access when replacing the air filter,
• maintenance of the factory intake noise level.

The used component allows for an economical repair of the intake system while maintaining the original manufacturer's specification.

Application in Mercedes vehicles

The housing is assigned to the M112 engine series used in the Mercedes W211, which guarantees compatibility with the factory engine bay design and equipment. As a result, it is a practical solution in situations where the existing housing has suffered mechanical damage, thermal deformation, or operational wear.

To ensure full compatibility, it is worth verifying compliance by the OEM part number or interchangeable numbers in the technical specifications tab, which facilitates the selection of the correct element for a specific vehicle configuration.

Expanding the Mercedes intake system

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

Safe purchase of a used filter housing

When choosing a used air filter housing, it is worth paying attention to compliance with manufacturer markings as well as the technical condition of the body and mounting points. Additional support can be found in a practical guide on purchasing used components online – detailed tips can be found in the article Safe purchase of used car parts online – a step-by-step guide, which discusses, among other things, selection by OEM numbers and seller verification.