Mercedes C140 CL420 M119 Air Flow Mass Sensor MAF A0000940748

Mercedes C140 CL420 M119 Air Flow Mass Sensor MAF is a component from the Air and fuel intake sensors category, designed for precise measurement of the air intake volume in the M119 engine. A properly selected mass air flow sensor supports stable engine operation, correct fuel metering, and smooth performance across the entire rev range.

Specifications and technical data

• SKU: A0000940748
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0000940748
• Substitutable numbers: A0000940748, A 000 094 07 48, 0280217807, 0 280 217 807
• Category: Air Intake & Fuel Sensors

Purpose and function in the intake system

The mass air flow sensor used in the Mercedes C140 CL420 M119 model is responsible for the continuous measurement of the air mass supplied to the cylinders. The signal from the sensor is sent to the engine control unit, which uses it to determine the fuel dose, ignition timing, and mixture corrections. A properly functioning component in this group of sensors reduces the risk of power loss, increased fuel consumption, or unstable idle speed.

In the M119 engine, known for its high level of refinement, a functional mass air flow sensor is crucial for maintaining proper dynamics, smooth throttle response, and correct operation of the exhaust emission system. Replacing a worn or damaged sensor with the correct model dedicated to this body variant and engine unit allows for the restoration of factory engine performance parameters.

Compatibility and selection by part numbers

The offered mass air flow sensor belongs to the group of OEM components used in Mercedes vehicles, which facilitates the selection of parts based on catalog numbers and the sensor manufacturer's markings. This allows for precise matching to the specific configuration of the M119 engine in the C140 body, without the need to use replacements with uncertain specifications.

When selecting a mass air flow sensor, it is worth paying attention to compatibility with the factory part number and the list of interchangeable numbers to ensure that the sensor will work with the existing engine control unit and wiring harness. This selection method minimizes the risk of diagnostic errors, adaptation problems, and incorrect air flow readings.

Performance characteristics and advantages of use

As a component from the Air and fuel intake sensors category, this mass air flow sensor has been designed to operate in the demanding thermal and mechanical conditions of the engine bay. The sensor's design enables stable reading of flow parameters even under large load changes, which translates into predictable vehicle behavior during acceleration and steady-speed driving.

• maintaining the correct air-fuel ratio across the entire rev range,
• reducing the risk of mixture-related warning lights,
• better cooperation with the ignition and exhaust systems,
• more repeatable computer diagnostic results.

For the user, this means more predictable operation, easier diagnosis of potential faults, and the ability to maintain engine performance parameters close to factory specifications.

Condition, installation, and practical aspects

The offered mass air flow sensor is a used component, which allows for an economical repair of the intake system while maintaining compliance with factory specifications. In practice, installation involves replacing the existing sensor in the intake housing, while maintaining the correct air flow orientation and properly connecting the electrical connector.

Before installation, it is recommended to verify the condition of the intake hoses, air filter, and the tightness of the entire system so that the new component operates in stable conditions. After installation, it is worth performing an adaptation of parameters in the engine control unit (if the service procedure provides for it) and a control reading of error codes, which will allow confirming the correct cooperation of the sensor with the vehicle's electronics.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as mass air flow sensors, air temperature sensors, or manifold pressure sensors, check the available parts in the Mercedes Air and fuel intake sensors category.

Technical support and knowledge about used electronics

Selecting the right MAF sensor for a specific engine and control unit configuration can be demanding, which is why it is worth using verification by numbers and the experience of specialists dealing with automotive electronics. Proper matching reduces the risk of hardware and software compatibility problems and speeds up the repair process.

If you want to deepen your knowledge about the selection and operation of used sensors and control modules, check out the guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?