Air Duct Mercedes W204 W906 OM651 Pipe Intake Hose Diesel A6510904000

Air Duct Mercedes W204 W906 OM651 Pipe Intake Hose Diesel is an original air supply system component designed for OM651 diesel engines. Thanks to its factory geometry and fitment, it ensures stable airflow to the power unit, which promotes the proper operation of the turbocharging and fuel injection systems. This is a practical solution for users who want to maintain structural consistency of the intake system in their Mercedes W204 and W906 models.

Specifications and technical data

• SKU: A6510904000
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6510904000
• Substitutable numbers: A6510904000, A 651 090 40 00, A6510900728, A 651 090 07 28
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the intake system

The intake pipe in the OM651 diesel engine is responsible for directing air from the filtration and turbocharging system to the intake manifold. The proper shape and cross-sectional diameter help maintain the correct pressure and flow velocity, which translates into smooth engine operation, correct throttle response, and stable combustion parameters. In modern diesel engines, maintaining airtightness and proper air routing is crucial for the operation of the turbine, EGR system, and exhaust gas treatment systems.

Benefits of using an original intake pipe

Using an original intake pipe in a Mercedes with an OM651 engine allows you to maintain factory flow parameters without the risk of improper fitment or stress on the connections. This is particularly important in diesel units, where the intake system operates under increased pressure. A properly selected component helps reduce power drops resulting from leaks, minimizes the risk of contaminants entering the system, and supports the stable operation of engine accessories.

Technical characteristics and compatibility

The pipe belongs to the group of elements referred to as Lines, hoses, and pipes, which are components responsible for transporting working media in the vehicle. In this case, the medium is air sucked in and compressed in the diesel engine, so the construction must be resistant to temperature changes, vibrations, and loads resulting from turbocharger operation. The element is designed for the specific engine bay architecture in W204 and W906 models, which facilitates installation at original mounting points and cooperation with other system parts.

Application in OM651 diesel engines

OM651 diesel engines used in Mercedes W204 and W906 models require precisely selected intake components to maintain the appropriate boost pressure and proper operation of control systems. The intake pipe adapted for Diesel fuel type supports efficient cylinder filling, which is important for both performance and fuel consumption. The proper condition of the intake element also helps reduce the risk of error codes stored in the engine control unit related to incorrect airflow.

Practical installation and maintenance tips

When replacing the intake pipe, it is worth paying attention to the condition of clamps, seals, and adjacent lines to avoid subsequent leaks. It is recommended to check the contact surface with the air filter, turbocharger, or manifold, depending on the specific system configuration. In the event of symptoms such as air whistling under load, power loss, or increased exhaust smoke, checking the intake components should be one of the first diagnostic steps.

Why choose an original used part

Choosing an original, used intake pipe for a Mercedes allows you to maintain factory fitment while optimizing repair costs. This solution is particularly attractive for premium class cars, where new components can be significantly more expensive. It is worth considering a service strategy based on proven OEM parts, which we describe in more detail in the article: why used original parts for premium cars are becoming a key choice in 2026.

System completion and further expansion

If you are planning comprehensive maintenance of the intake system or replacing several elements responsible for airflow, also check other components in the Lines, hoses, and pipes category. This will allow you to select a consistent set of parts that will facilitate installation and reduce the risk of subsequent leaks or improper routing of lines in the engine bay.

Additional information on selecting intake elements, typical signs of wear, and the impact of system airtightness on diesel engine operation can be found in our guide: how to properly diagnose and service the intake system in modern engines. This will make it easier for you to plan your repair and select the right components for your Mercedes.