If your vehicle has an internal combustion engine, it depends on two things to make propulsion power for you to be able to motor on down the road: fuel and air.  The engine mixes the two in just the right proportion so that they can be ignited, creating a series of tiny explosions that are coordinated in such a way that your vehicle moves steadily ahead.

One of the key parts to making sure that mixture of air and fuel is correct is a little tube that measures the amount of air that’s coming into the engine.  It’s called a Mass Air Flow sensor, or MAF sensor.  There are two wires in this tube, one of which is heated up with electricity and the other isn’t.  When the air flows over the heated wire, it cools.  When the temperature of the two sensing wires is different, the MAF sensor either increases or decreases the current to the heated wire to try to make it the same as the other wire. That’s sent to a small computer that tells the engine to change the amount of air going into the engine.

Some signs of an MAF sensor problem?  Your vehicle doesn’t have as much power as it used to, or your fuel economy might drop.  Your vehicle may not start,   and the Check Engine light may come on.

If you spot these signs, it’s important to bring your vehicle in so we can check things out.  At the same time a technician looks at the MAF sensor, they’ll also check the connector that runs to the engine’s computer and replace it if necessary. They’ll also inspect other parts of the system, such as hoses, for problems.  

By the way, one way to minimized MAF sensor problems is make sure your vehicle’s engine air filter is regularly changed. That can help you be sure that the air that gets to your vehicle’s engine is clean.

Tuffy Bloomington
1505 East Vernon Avenue
Bloomington, Illinois 61701
309.662.0537