Mercedes W204 W212 W221 Diesel CDI Throttle Housing Air Pipe Hose A6420900344

Mercedes W204 W212 W221 Diesel CDI Throttle Housing Air Pipe Hose is a precision intake system component designed for Mercedes diesel engines. It is responsible for a stable connection between the throttle body and other intake components, which promotes proper airflow and maintains the correct operating parameters of the power unit. This solution is dedicated to users who expect consistency with the factory design and want to maintain the original engine performance characteristics.

Specifications and technical data

• SKU: A6420900344
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420900344
• Substitutable numbers: A6420900344, A 642 090 03 44, KZ
• Fuel type: Diesel
• Category: Throttle Bodies

Purpose and function in the intake system

The throttle pipe hose in Mercedes C, E, and S-Class models of the W204, W212, and W221 generations operates in the immediate vicinity of the throttle body, ensuring a tight and stable connection of the intake elements. In a diesel engine, proper airflow is crucial for fuel dosage, combustion efficiency, and engine smoothness, which is why the condition of this component affects:

• idle stability and throttle response,
• even cylinder filling with air,
• reduction of power drops resulting from intake leaks,
• proper cooperation with the throttle control and boost system.

Compatibility with Mercedes diesel engines

The presented hose has been designed to work with diesel-powered engines, which means it is adapted to higher boost pressures and the specific operating conditions of diesel intake systems. The component's design is optimized for:

• resistance to variable intake air temperatures,
• cooperation with the turbocharger and throttle in forced induction systems,
• maintaining adequate rigidity while dampening vibrations.

As a result, the throttle pipe hose helps maintain factory engine performance, which is particularly important in modern diesel units that are sensitive to any leaks and deviations in airflow.

Characteristics of the used component

The offered hose comes from the Throttle Bodies category and is a used item, which in practice means it was previously operated in a vehicle but is still suitable for further use after proper installation. Choosing such a solution is beneficial for users who:

• are looking for parts consistent with the original intake system design,
• want to reduce repair costs while maintaining compatibility with factory components,
• prefer parts sourced from dismantled Mercedes vehicles.

A throttle pipe hose of this type will work well both for standard replacement of a worn-out part and for repairs related to intake leaks, power issues, or unstable diesel engine operation.

Benefits of using an original Mercedes solution

Using a throttle pipe hose dedicated to specific Mercedes W204, W212, and W221 generations allows for maintaining consistency with the factory intake system design. This translates into:

• proper geometric fit to the throttle body and other hoses,
• reduced risk of leaks resulting from imprecise fitment,
• stable operation of the air control system in the diesel engine.

For the user, this means a lower risk of airflow-related errors, better repeatability of operating parameters, and easier diagnostics in case of any future faults.

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 throttle bodies, intake hoses, or connecting ports, check the available parts in the Mercedes Throttle Bodies category.

More about the use of used parts

When selecting a used throttle pipe hose, it is worth paying attention to the general condition of the element and compatibility with the specific vehicle configuration. Additional information on how to effectively use parts from dismantling and what to look for when choosing them can be found in the article Replacing body parts with used ones – can body parts from dismantling look like new?, which discusses the practical aspects of using used components in popular brands, including Mercedes.