Air Flow Sensor Mercedes W204 W207 W639 W906 Mass Meter Sensor A6510900248

The Mercedes W204 W639 OM651 Diesel Air Flow Meter is an original part from the Air and Fuel Intake Sensors group, designed for Mercedes diesel engines OM651. It ensures precise measurement of the mass of inhaled air, which translates to stable engine operation, correct fuel dosing, and predictable performance.

Specifications and technical data

• SKU: A6510900248
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6510900248
• Substitutable numbers: A6510900248, A 651 090 02 48
• Category: Air Intake & Fuel Sensors

Function and Application of the OM651 Air Flow Meter

The air flow meter in the OM651 diesel engine is responsible for accurately reading the amount of air supplied to the intake manifold. Based on this data, the engine control unit selects the fuel dose, corrects the operation of the injection system, and manages exhaust gas recirculation. A properly functioning component from this group:

• stabilizes idle speed and throttle response,
• reduces excessive smoke and power loss,
• supports the correct operation of the turbocharger and EGR system,
• helps maintain fuel consumption at a predictable level.

For OM651 units, using the correct air flow meter is crucial for engine durability and proper cooperation with the control electronics.

Benefits of Using an Original Mercedes Air Intake Sensor

The original air flow meter from the Air and Fuel Intake Sensors family for Mercedes has been designed for specific injection maps and diesel engine operating characteristics. In practice, this means:

• accurate reproduction of factory parameters,
• correct cooperation with the engine control unit software,
• reduced risk of diagnostic errors and limp mode,
• compatibility with other components of the intake and fuel system.

Thanks to this, replacing a damaged air flow meter with an original part quickly restores proper engine operation without the need for additional modifications.

Condition, Selection, and Diagnostics

The offered air flow meter is a used part, allowing for economical repair while maintaining factory characteristics. For sensors in this group, it is particularly important to:

• select the part by OEM number or interchangeable numbers,
• verify compatibility with the specific OM651 engine version,
• check for control unit errors before and after installation.

To better understand the connections between the air flow meter and the fuel system, it is worth familiarizing yourself with the material describing the operation of the fuel system, diagnostics, and component selection by catalog numbers: Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair.

Practical Installation and Operational Tips

When replacing the air flow meter in an OM651 engine, it is recommended to maintain cleanliness within the intake ducts and check the condition of the air filter. Intake leaks, a dirty filter, or an incorrectly selected component can lead to:

• uneven idling,
• power loss at low and medium RPMs,
• increased fuel consumption and the appearance of errors in the control unit memory.

If you have doubts about selecting a used part, a guide comparing different solutions may be helpful: Car Parts – New or Used? A Comparison of Costs, Quality, and Durability.

Other Mercedes Air and Fuel Intake Sensors

If you are also looking for other Mercedes Air and Fuel Intake Sensors compatible with your model, check out the dedicated category: Mercedes Air and Fuel Intake Sensors. This will allow you to easily combine compatible intake and fuel system components in one place.