Air Flow Sensor Mercedes W203 W204 W211 M271 Mass Meter Sensor A2710940248

Visual condition of the part

The product shows signs of use visible in the photos.

Air Flow Sensor Mercedes W203 W204 W211 M271 Mass Meter Sensor is a precision intake system component responsible for accurately measuring the amount of air intake in M271 series engines. A properly selected mass air flow sensor stabilizes engine operation, supports correct fuel metering, and reduces the risk of power loss. By using this original Mercedes solution, compatibility with the factory engine performance characteristics is maintained.

Specifications and technical data

• SKU: A2710940248-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2710940248
• Substitutable numbers: A2710940248, A 271 094 02 48
• Category: Air Intake & Fuel Sensors

Function of the mass air flow sensor in the M271 engine

The air flow sensor in M271 engines is responsible for the continuous measurement of the mass of air drawn through the intake system. This information is sent to the engine control unit (ECU), which uses it to determine the fuel dose, ignition timing, and auxiliary equipment operating strategy. A properly functioning sensor translates into:

• stable idle speed and smooth acceleration,
• more predictable throttle response,
• reduction of excessive fuel consumption,
• reduced risk of error codes appearing in the engine control unit.

Design and role in the Air and fuel intake sensors system

The offered item belongs to the Air and fuel intake sensors group, which are components responsible for measuring the parameters of the medium supplied to the engine. The mass air flow sensor works in conjunction with the air filter housing and intake ducts to form a coherent measurement system. This ensures that the ECU receives reliable data under both low and high engine loads.

The proper operation of the mass air flow sensor is important not only for performance but also for the operation of the exhaust gas treatment system. Incorrect air measurement can lead to a mixture that is too rich or too lean, which in the long run affects the condition of the catalytic converter and other exhaust system components.

Selection and compatibility with Mercedes models

The mass air flow sensor has been designed for M271 units used in Mercedes W203, W204, and W211 models. This means it is matched in terms of design, electrical specifications, and the signal characteristics sent to the engine control unit. In practice, this translates into:

• secure seating in the designated location of the intake system,
• compatibility with the vehicle's electrical wiring harness,
• no need for installation modifications during assembly.

When selecting parts, it is worth paying attention to compatibility with the specific engine version and vehicle model year. Catalog data, VIN, and service documentation information can be helpful, minimizing the risk of purchasing an unsuitable component.

Condition, application, and benefits of installation

The offered mass air flow sensor is an aftermarket component, which allows for an economical repair of the intake system while maintaining the factory design concept. Replacing a faulty sensor with a functional component of this type is recommended when symptoms such as rough engine operation, power loss, increased fuel consumption, or errors related to air mass measurement occur.

The main benefits of using this mass air flow sensor in the M271 engine include:

• restoration of correct cooperation between the intake system and the engine control unit,
• more repeatable engine performance parameters across the full rev range,
• support for the proper operation of the fuel and ignition systems,
• reduction of the risk of further failures resulting from an incorrect air-fuel mixture.

Technical support and additional materials

When diagnosing engine performance issues, it is worth considering not only the mass air flow sensor but the entire measurement path and fuel supply system. Detailed information on the cooperation of sensors with the fuel system, principles of selecting parts by catalog numbers, and the basics of diagnostics can be found in the article: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

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 boost pressure sensors, air temperature sensors, or other measurement components, check the available parts in the Mercedes Air and fuel intake sensors category.