Mercedes-Benz A M Class W168 W166 Air Filter Box Housing A1660940001

Mercedes-Benz A M Class W168 W166 Air Filter Box Housing is an original intake system component designed for installation in the rear section of the vehicle. It ensures stable seating of the filter element, proper airflow, and secure routing of the intake duct, which translates into efficient engine operation and reduced contamination. This used, factory-original housing is an excellent choice for those seeking a component that meets factory specifications without the need to invest in a new part.

Specifications and technical data

• SKU: A1660940001
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1660940001
• Substitutable numbers: A1660940001, A 166 094 00 01, A1661406600, A 166 140 66 00, EM
• Location on the vehicle: Rear
• Category: Air Filters

Function and role of the air filter housing

The air filter housing in Mercedes W168 and W166 class models is responsible for tightly sealing the filter element and directing the airflow drawn into the engine. A properly selected housing:

• maintains the filter in a stable position, preventing it from shifting during driving,
• limits the ingress of external contaminants beyond the filter medium,
• ensures appropriate airflow geometry, which promotes smooth operation of the power unit,
• minimizes intake noise thanks to the precisely matched chamber design.

A properly selected housing is particularly important in vehicles where the intake system has been designed for a specific shape and volume of the filter chamber.

Purpose and placement on the vehicle

The presented air filter housing is a component dedicated to Mercedes vehicles, located in the rear part of the vehicle. Such placement requires maintaining adequate rigidity and resistance to vibrations, as the component operates in a zone exposed to temperature changes and the influence of underbody air turbulence.

In practice, this means that the housing must:

• maintain the tightness of connections with intake ducts and the engine housing,
• withstand loads resulting from suspension and bodywork operation,
• provide easy service access to the filter element during periodic inspections.

Benefits of using an original housing

Using an original air filter housing in a Mercedes W168/W166 allows for the preservation of factory intake system parameters. Key advantages include:

• Full installation compatibility – matching factory mounting points and stock intake ducts.
• Stable airflow guidance – maintaining the flow path designed by the manufacturer, which promotes even cylinder filling.
• Reduced risk of leaks – proper fitment of the cover and housing body reduces the risk of drawing in unfiltered air.
• Hassle-free service – easier filter element replacement thanks to the retention of original latch and mounting designs.

For users who want to keep their vehicle in a configuration close to the factory state, choosing such a housing is a technically safe and predictable solution.

Condition and practical application

The air filter housing is offered as a used part, which allows for an economical repair or replacement of a damaged component while maintaining the original manufacturer's specifications. This type of component will work well both for standard replacement of a worn-out housing and for restoring a vehicle to its factory-designed state after previous modifications.

Before installation, it is recommended to perform a standard check of the tightness, the condition of the seals, and the contact surfaces with the filter element to ensure the proper operation of the entire intake system.

Expanding the intake system in a Mercedes

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 housings, inserts, or intake ducts, check out the available parts in the Mercedes Air Filters category.

If you want to better understand why used OEM components for premium cars are becoming an increasingly popular choice, it is worth reading an article describing current market trends: Crisis in the new parts market? Why used originals for premium cars are the hottest trend in 2026.