Your vehicle is made up of so many different parts necessary for it to run properly. One of the parts you need to be aware of is the mass flow sensor. The mass flow sensor is part of the fuel injection system, and it is generally located right next to the air filter. Its job is to measure the air going into the engine and ensure that the air-to-fuel ratio is correct so that your vehicle's engine functions as it should.   

This small part plays a significant role in the overall effective operation of your vehicle. You need to be aware of a few signs that will let you know that the mass airflow sensor isn't working right.   

1. Trouble Starting Your Engine  

It should turn over smoothly when you put your key in your engine. It shouldn't be difficult to start. If it is difficult to start, and you have a fully charged battery and a working alternator, the chances are that your mass airflow sensor isn't working right. If the air-to-fuel ratio is off, your vehicle will not get the fuel and air mixture it needs even to start up. Your car may start after a few tries, or it may fail to start at all. In this case, you need to take your vehicle into an auto repair shop and get the mass airflow sensor replaced.  

2. Misfiring  

If your vehicle starts up but seems to be misfiring or running rough, that is because your mass airflow sensor doesn't isn't just working when you start your engine. It is constantly working and adjusting the airflow ratio to create the right mix with the fuel and allow your engine to run smoothly.   

This is a process that occurs throughout the time you are driving. Your vehicle will misfire because, without the air information from the sensor, the powertrain module doesn't know the right amount of fuel to release, creating uneven combustion, and resulting in what is known as a misfire.   

3. Black Exhaust   

You shouldn't notice your exhaust because it should typically be clear to a light grey color. If you suddenly notice that you have a trail of black smoke behind your vehicle, then you are going to want to get your vehicle into an auto repair shop as soon as possible. Black smoke trailing your vehicle is never a good sign.   

4. Check Engine Light  

The mass airflow sensor is one of the many sensors that can trigger your check engine light. If your check engine light comes on, head to your mechanic right away. They can pull the code that is triggering the check engine light and let you know what is most likely wrong with your vehicle.   

The mass airflow sensor is a small but essential part of your fuel injection system, and your fuel injection system is an integral part of your engine. If you notice any warning signs above, it is essential to see a mechanic and get the auto repair right away.