Mercedes W166 W212 W221 M 157 Air Filter Box Cover Trim Right O/S A2780100767

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W166 W212 W221 M 157 Air Filter Box Cover Trim Right O/S is an original intake system component designed for installation on the right side of the engine bay. It ensures stable mounting of the filter housing, protects components from contamination, and helps maintain proper airflow into the engine, which is particularly critical in high-performance units such as the M157.

Specifications and technical data

• SKU: A2780100767
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2780100767
• Substitutable numbers: A2780100767, A 278 010 07 67
• Location on the vehicle: Right
• Category: Rocker & Valve Covers

Purpose and function in the intake system

The described cover is part of the Tappet and Valve Covers group, although in practice, it serves as a cover and trim for the right side of the air filter housing in selected Mercedes SUV and sedan models. Its tasks include:

• stabilizing the right part of the air filter housing within the engine bay,
• protecting intake components from external dirt,
• organizing the engine bay space and improving service ergonomics,
• limiting the ingress of hot air from the engine bay into the intake zone.

Thanks to its precise fit to the body structure and intake system, the cover helps maintain stable engine operating conditions, which translates into consistent performance and predictable behavior of the powertrain.

Compatibility with Mercedes models

The cover has been designed specifically for selected Mercedes models from the W166, W212, and W221 families equipped with the M157 engine. This means its geometry, mounting points, and shape are adapted to the factory architecture of these vehicles' engine bays. Using an original component allows you to maintain:

• proper fitment with the air filter housing and adjacent components,
• compatibility with factory brackets and mounting points,
• the aesthetic, organized engine bay look characteristic of the Mercedes brand.

The component is intended for installation on the right side of the vehicle, which is important when selecting parts for intake systems with a mirrored design.

Characteristics of the original Mercedes part

As a Mercedes brand product, the air filter box cover has been manufactured in accordance with the manufacturer's internal standards regarding thermal resistance, dimensional stability, and mechanical durability. In practice, this means:

• the use of material resistant to temperature and typical loads in the engine bay,
• retention of shape and mounting points even after long-term use,
• no modifications required during installation – the part fits into the factory location.

The item comes from the secondary market, which allows for combining an attractive price with the preservation of the original manufacturer's specifications. This is a particularly attractive solution for servicing cars with powerful engines, where the consistency of the entire intake system is important.

Why it is worth using this cover in the intake system

Using the correct air filter box cover on the right side of the engine bay affects not only aesthetics but, above all, functionality. A properly selected component:

• reduces the risk of unwanted filter housing vibrations,
• helps maintain the tightness and stability of the intake system,
• facilitates service and removal of adjacent components,
• supports cleanliness in the air filter zone.

For users who prioritize consistency with the factory design and predictable engine behavior, choosing an original cover is a technically sound solution.

Related components and technical knowledge

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 covers, caps, or trim elements in the cylinder head and intake zone, check the available parts in the Mercedes Tappet and Valve Covers category.

When working on the engine and intake system, it is also worth understanding the impact of emission control systems on engine operating conditions – the article EGR: what it is and why it is worth considering used EGR valves, which discusses the importance of exhaust gas recirculation in modern engines, may be helpful.

Additional practical tips regarding the operation and service of Mercedes engines are also provided in the guide Reliability under the star sign – how to take care of engine accessories in popular Mercedes-Benz C and E-Class models?, which describes best practices for selecting and replacing engine accessory components.