Mercedes W203 W211 Air Filter Housing Engine Cover M112 Petrol A1120940004

Description

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W203 W211 Air Filter Housing Engine Cover M112 is an original intake system component designed for petrol engines, mounted on the right side of the engine bay. As part of the Air filter housings group, it ensures stable mounting of the filter element and proper airflow guidance to the power unit. This used OEM component allows for maintaining the factory engine performance characteristics and compatibility with original mounting points in Mercedes C-Class W203 and E-Class W211 models equipped with the M112 engine.

Specifications and technical data

• SKU: A1120901101-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1120901101
• Substitutable numbers: A1120901101, A 112 090 11 01, A1120940004, A 112 094 00 04
• Location on the vehicle: Right
• Fuel type: Petrol
• Category: Air Filter Housings

Function and role in the intake system

The air filter housing in the M112 engine is responsible for tightly sealing the filter element and directing the airflow into the intake manifold. A properly selected cover minimizes the risk of contaminants entering the engine, which translates into stable operation of the petrol unit, uniform combustion, and reduced wear of moving parts.

Thanks to the factory geometry of the intake ducts, the housing maintains the correct flow resistance, which is essential for the proper operation of engine control systems and for maintaining standard power and torque parameters.

Compatibility with Mercedes W203 and W211

The cover has been designed specifically for the M112 engine used in Mercedes W203 and W211 models, taking into account the mounting on the right side of the engine bay. This means it is perfectly matched to:

• factory mounting points on the body and the filter base,
• original intake hoses and clamps,
• accessories located in the immediate vicinity of the housing.

Such a fit facilitates installation and eliminates the need for any modifications, which is particularly important when servicing vehicles equipped with Mercedes petrol engines.

Benefits of using an original air filter housing

Using an original air filter housing cover instead of a damaged or leaking component provides a number of practical benefits:

• Stable petrol engine operation – maintaining proper airflow and intake system integrity.
• Engine protection – effective separation of contaminants from the engine interior thanks to the correct pressure on the filter element.
• Factory fit – compatibility with the engine bay design in Mercedes W203 and W211, without the need for modifications.
• Consistency with other intake system components – correct connection with standard hoses, connectors, and mounts.

Installation and operational characteristics

The air filter housing mounted on the right side of the engine bay is adapted to operate under conditions typical for Mercedes petrol units. The construction ensures adequate rigidity while allowing for repeated opening and closing during periodic filter element replacement. This used component allows for an economical repair while maintaining the vehicle’s original specifications.

When replacing the cover, it is recommended to simultaneously check the condition of seals, intake hoses, and the air filter itself to fully utilize the potential of the intake system and avoid leaks that affect engine performance.

Expanding your Mercedes intake system service

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.

For drivers who, alongside intake system service, are considering purchasing a vehicle with a different type of transmission or are planning a gearbox repair, a practical guide describing the differences between manual, automatic, and DSG transmissions, common faults, and tips for choosing a used gearbox may be helpful – details can be found in the article Gearbox: manual, automatic, or DSG – common faults and used gearbox buying guide.