A car’s MAF (Mass Airflow Sensor) sensor is an essential component in internal combustion engines, whether petrol or diesel.
In short, the primary function of an air mass sensor is to measure the amount of air flowing into an engine and provide the accurate information required to control your car’s engine.
Interested in finding out the symptoms of a faulty MAF sensor or how to diagnose any problems with your sensor? Then read on!
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What is a MAF Sensor?
A MAF sensor is a component used in internal combustion engines to measure the amount of air entering the engine in order to adjust the amount of fuel injected.
Using the information obtained and sent to the engine control unit (ECU), it is possible to calculate the amount of fuel that needs to be injected into the cylinders.
What is the purpose of a MAF Sensor?
With a basis on MAF sensor data, the ECU can dynamically adjust fuel injection to optimise engine efficiency under different conditions, such as when a driver accelerates and decelerates, and depending on a car’s engine load and the altitude driven at.
As such, it allows for smoother driving, fuel savings, and the emission of fewer polluting gases.
Where is a car’s Mass Airflow Sensor Located?
This component is located between a car’s air filter and throttle body. In some models, the sensor is located inside the air filter housing.
If you are unable to locate the MAF sensor in your car, refer to your owner’s manual.
How does a MAF Sensor work?
Mass airflow sensors contain a small wire that is electrically heated (hot filament) and a temperature sensor to measure air temperature.
When your car engine is rough idling, a small amount of air flows around the filament, so a small amount of electric current is required to heat it.
When you accelerate, the air around the hot filament increases, cooling it.
The higher the airflow, the greater the electric current required to keep it warm.
When sent this information by the MAF sensor, the electronic control unit calculates the amount of fuel to inject for the most efficient use of the engine.
What types of MAF Sensor Are There?
There are currently two types of mass airflow sensors:
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Digital MAF Sensors
Digital MAF sensors are powered by the Electronic Control Unit (ECU), requiring a voltage of 5V;
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Analogue MAF Sensors
Analogue MAF sensors contain a tube that deviates to two sensors: one which is at room temperature and the other which is heated to 200° at the point at which it enters the engine. The airflow cools the hot film, causing a variation in the electrical resistance and voltage sent to the ECU.
Are MAF Sensors Compatible with All Types of Vehicles?
Mass airflow sensor compatibility depends on several factors, such as engine type, engine control system, as well as vehicle model, brand, and manufacturer.
Each manufacturer may use different engine management technologies, influencing MAF sensor specifications.
Sensors may also differ in size, electrical connections, or communication protocols.
What Care and Maintenance Does a MAF Sensor Require?
Proper maintenance is required to extend the life of a MAF sensor. As such, you should replace the air filter regularly to prevent particles from sticking to the filament. When cleaning this component, always do so using the recommended products.
How Should you Clean your MAF Sensor?
Simply open the MAF sensor cover and clean the resistors with a suitable product.
Though it is possible to clean a MAF sensor at home, it is recommended that this service is carried out at a car garage, as you may risk damaging this component if you mishandle it.
How do you know if your Mass Airflow Sensor is Broken?
A faulty MAF sensor will produce symptoms such as:
- Low acceleration;
- Engine splutters;
- Lack of engine power;
- Increased fuel consumption;
- Difficulties in starting the engine.
In addition, you may notice a light or indicator on your dashboard, such as a “Check Engine” or “Service Engine Soon” light.
How can you Test a MAF Sensor?
To determine whether your car’s mass airflow sensor is faulty, you should perform a thorough diagnostic using the appropriate tools.
If you experience any instability, such as engine splutters or a lack of power, it may mean your MAF is malfunctioning.
What products related to a MAF Sensor are available in the KROFtools Catalogue?
If your diagnosis points to this component being faulty, it’s best to replace it immediately. To help you, the KROFtools catalogue contains the tool you’ll need to remove the MAF VAG/Porsche connector.
MAF Connector Removal Tool for the VAG/Porsche
This tool allows you to safely remove most VAG “Push & Pull” Connectors, such as the MAF electrical connector, pressure sensor (MAP), or ignition coil pack.
This tool is compatible with VW, Audi, Skoda, Seat, and Porsche cars.
Click on the image to find out more about our MAF Connector Removal Tool for the VAG/Porsche (ref. 0812).
How much does a MAF Sensor cost?
Prices of mass airflow sensors range from tens to hundreds of euros, depending on the type of MAF, model, and manufacturer.
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