Mercedes-Benz W202 W203 W208 W210 W211 Air Flow Mass Meter Sensor A1120940048

Mercedes-Benz W202 W203 W208 W210 W211 Air Flow Mass Meter Sensor is a precision intake system component responsible for accurately measuring the mass of air drawn into the engine in this series. This allows the engine control unit to properly adjust the fuel dosage, which translates into stable engine operation, correct dynamics, and predictable fuel consumption. This solution is intended for users looking for a proven, original component for Mercedes C-Class, E-Class, and CLK models from the listed generations.

Specifications and technical data

• SKU: A1120940048
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1120940048
• Substitutable numbers: A1120940048, 0280217515, 0 280 217 515, KZ
• Category: Air Intake & Fuel Sensors

Function and role of the mass air flow sensor in a Mercedes-Benz

The mass air flow sensor in Mercedes-Benz W202, W203, W208, W210, and W211 models is a key sensor in the fuel supply system. Based on the signal from this component, the engine control unit corrects the fuel dosage, ignition timing, and the operation of other components, which affects:

• stable idle speed and smooth acceleration,
• proper throttle response,
• maintaining an optimal air-fuel mixture,
• reduction of smoke and excessive exhaust emissions.

A well-chosen sensor from the Air and fuel intake sensors group allows you to restore correct engine performance parameters without the need to interfere with other system components.

Compatibility with W202, W203, W208, W210, W211 series

The offered mass air flow sensor has been designed for specific Mercedes-Benz platforms, which ensures proper fitment to the stock intake system and electrical harness. Thanks to this:

• the factory air flow geometry through the sensor housing is maintained,
• the electrical connector fits the original harness without modifications,
• the engine control unit receives a signal with parameters consistent with factory specifications.

Such fitment reduces the risk of ECU errors, warning lights, and adaptation problems after installation.

Characteristics of the used component

The offered sensor comes from the group of used Mercedes components, which allows you to combine reasonable cost with maintaining original performance characteristics. In practice, this means that:

• you receive a component with parameters consistent with the manufacturer's original design,
• you avoid typical problems associated with cheap replacements that provide an unstable signal,
• you can restore proper engine operation without excessive financial expenditure.

During installation, it is recommended to check the tightness of the intake system and the condition of the air filter to fully utilize the potential of the installed mass air flow sensor.

Benefits of using an original Mercedes mass air flow sensor

Choosing an original mass air flow sensor instead of a worn or faulty component helps reduce typical symptoms such as power loss, jerking during acceleration, or increased fuel consumption. The most important advantages include:

• stable engine operation across the entire rev range,
• better idle quality,
• more predictable response to load,
• reduced risk of the engine entering limp mode.

For workshops and individual users, this means easier diagnostics, faster resolution of intake system faults, and greater repeatability of repair results.

Intake system expansion and related components

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 temperature sensors, boost pressure measurement elements, or other components responsible for mixture control, check the available parts in the Mercedes air and fuel intake sensors category.

More about choosing used automotive electronics

If you are considering a wider replacement of electronic components in your car and want to take a conscious approach to purchasing used controllers, modules, and sensors, it is worth checking out expert advice. Practical tips on selecting and verifying such components can be found in the article A second life for electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?.