Mercedes W169 W245 OM640 CDI Diesel Air Filter Box Housing A6400900701

The Mercedes W169 W245 OM640 Air Filter Housing is a factory intake system housing designed for Diesel engines in compact Mercedes A-Class and B-Class models. The original design ensures proper air routing to the engine, stable mounting of the filter element, and airtightness of the entire intake system. It's a practical solution for users seeking a proven OEM part instead of aftermarket alternatives with uncertain specifications.

Specifications and technical data

• SKU: A6400900701-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6400900701
• Substitutable numbers: A6400900701, A 640 090 07 01, KD
• Fuel type: Diesel
• Category: Air Filter Housings

Purpose and Function in the Intake System

The air filter housing in a Diesel engine is responsible for directing the drawn-in air through the filter element and maintaining proper airtightness between the intake and the manifold. In OM640 units, a correctly chosen housing is crucial for:

• stable airflow under various engine loads,
• protecting the turbocharger and internal components from contaminants,
• maintaining the correct operating parameters of the boost system and engine control,
• reducing intake air noise.

Using the original housing to replace a damaged or leaky one restores correct engine operating conditions without altering the factory design.

Benefits of Using the Original Air Filter Housing

Choosing a housing from the Air Filter Housings group, specifically for Mercedes W169/W245 with an OM640 engine, is a solution that simplifies servicing and reduces the risk of operational problems. Key advantages include:

• factory fit for mounting points and engine bay geometry,
• maintaining the airflow path as designed by the manufacturer,
• no need for modifications to brackets, hoses, or vacuum connectors,
• easier diagnosis of potential intake system leaks.

This ensures a predictable installation process and minimizes the risk of incorrect operation of the mass airflow sensor, turbocharger, or EGR system.

Application in Diesel Engines

Diesel engines are particularly sensitive to the quality of air supplied to the combustion chamber. The air filter housing designed for the OM640 unit is engineered to work with the airflow characteristics typical of modern diesels. Appropriately shaped intake channels and the filter chamber help maintain:

• correct boost pressure across the entire RPM range,
• stable airflow sensor readings,
• repeatable mixture combustion conditions.

This translates to smooth engine operation, predictable throttle response, and reduced risk of intake system-related errors.

Condition, Installation, and Practical Service Tips

This part is from the used parts category, allowing for economical repair while maintaining original manufacturer specifications. Before installation, a standard visual inspection is recommended for any cracks, damaged clips, and the condition of connection spigots. During replacement, it is advisable to:

• check the condition of intake hoses and clamps,
• install a new air filter element suitable for the specific engine,
• ensure all clips and fasteners are properly secured.

This approach allows for the restoration of correct airtightness and functionality of the entire intake section in a single service operation.

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 parts from the same group, such as additional housings, intake ducts, or air hoses, check the available parts in the Mercedes Air Filter Housings category.

For users interested in a broader approach to selecting used components – especially in the area of control electronics and sensors – a guide describing the principles of selection by OEM numbers, hardware and software compatibility, and practical installation examples may be helpful: Used Automotive Electronics – A Guide to Selecting ECU Modules and Sensors.