Mercedes W164 W203 W204 W212 M272 Air Flow Mass Meter Sensor Unit A2730940948

Visual condition of the part 

The product shows signs of use visible in the photos. 

Mercedes W164 W203 W204 W212 M272 Air Flow Mass Meter Sensor Unit is a component from the Air and fuel intake sensors group, designed for precise measurement of the intake air volume in M272 petrol engines. A properly selected mass air flow sensor stabilizes engine operation, improves idle performance, and supports correct fuel metering under typical operating conditions.

Specifications and technical data

• SKU: A2730940948-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2730940948
• Substitutable numbers: A2730940948, A 273 094 09 48, 0 280 218 190, 0280218190
• Category: Air Intake & Fuel Sensors

Application and role in the intake system

The mass air flow sensor in the M272 engine is responsible for measuring the mass of air supplied to the intake manifold, which allows the engine control unit to accurately calculate the fuel dose. In Mercedes W164, W203, W204, and W212 class vehicles, this type of sensor works with the injection and ignition systems, influencing parameters such as:

• idle speed stability,
• throttle response,
• smooth acceleration without jerking,
• maintaining the correct air-fuel mixture ratio across a wide range of loads.

A well-chosen mass air flow sensor reduces the risk of increased fuel consumption and helps maintain exhaust emissions at the level specified by the vehicle manufacturer.

Compatibility and OEM identification

The offered component belongs to the group of original solutions used in Mercedes vehicles with the M272 engine, installed in, among others, the W164, W203, W204, and W212 body series. Identification by OEM part number and available replacement numbers allows for precise matching of the component to a specific engine version and model year, which is particularly important for vehicles equipped with advanced diagnostic systems.

In practice, this means that before purchasing, it is worth comparing the markings on the housing of the old mass air flow sensor or verifying compatibility by the OEM number in the manufacturer's catalog. This approach minimizes the risk of installing an incorrect sensor and eliminates problems with engine control unit errors.

Operating characteristics and benefits of installation

The mass air flow sensor in this type of engine operates continuously, providing the controller with a signal proportional to the amount of air flowing through the intake duct. A properly functioning sensor translates into:

• more predictable engine response to load,
• more efficient adaptation of the controller after replacing the component,
• reduction of errors related to lean or rich mixtures,
• better cooperation with lambda sensors and the catalytic converter.

For the user, this means higher engine refinement, less tendency to stall when approaching intersections, and more repeatable parameters during computer diagnostics.

Condition, origin, and installation aspects

The offered mass air flow sensor is a used component, sourced from dismantling, which allows for economical repair of the intake system while maintaining compliance with Mercedes factory specifications. This type of part is particularly attractive for older W164, W203, W204, and W212 models, where an optimal cost-to-functionality ratio is of key importance.

Due to the plug-and-play design, installation is usually limited to disconnecting the electrical connector, unscrewing the housing from the intake duct, and installing the new component in the same place. After replacement, it is recommended to perform a mass air flow sensor adaptation and clear stored errors in the controller to fully utilize the potential of the newly installed sensor.

Technical support and additional resources

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 additional air sensors, temperature measurement elements, or components related to fuel metering, check the available parts in the Mercedes air and fuel intake sensors category.

For a better understanding of how the mass air flow sensor works with the fuel supply system and its impact on the operation of injectors and pumps, it is worth reading the guide material: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration. This will allow for more effective diagnosis of symptoms related to an incorrect mixture and planning further service actions.