How Do MAF Sensors Work in a Vehicle?

Role of Sensors in Your Vehicle

Critical to ensuring engine performance and vehicle safety, sensors are responsible for monitoring the various systems and components of the vehicle. Sensors send the information that they collect to the vehicle’s brain, the electronic control unit (ECU), and using the data, the ECU makes changes to ensure vehicle safety or that the engine runs smoothly.

What is a MAF Sensor?

The mass air flow (MAF) sensor is responsible for measuring the air mass coming into the engine intake in internal combustion engines with fuel injection. MAF sensors tell the ECU how much air is coming in so the right amount of fuel is injected into the engine, ensuring that it completes an efficient combustion process. The MAF has a direct impact on the engine’s efficiency and power.

Located between the air filter and the intake manifold, the MAF sensor operates in real time to help the ECU adjust the fuel injection. This ability to adjust as needed means the engine can dynamically make changes when the driver accelerates, decelerates or is idling.

What Vehicles Use MAF Sensors?

As fuel-injection systems came into widespread use in the 1980s, MAF sensors started to appear on vehicles. While mass air flow sensors are found on many vehicles on the road today, some use a mass absolute pressure (MAP) sensor rather than a MAF sensor to measure the amount of air going into the intake manifold. Still other vehicles use both a MAF sensor and a MAP sensor. 

How Long Does a MAF Sensor Last?

MAF sensors typically last up to 100,000 miles, even when subjected to high heat in the engine.

What are the Signs of a Bad MAF Sensor?

A properly functioning MAF sensor ensures optimal engine performance and maximizes gas mileage. When the MAF sensor is malfunctioning, the ECU doesn’t know how much fuel to give the engine which can result in poor engine performance and increased gas consumption. Learn to recognize the symptoms of a bad MAF sensor:

If you notice any of these symptoms, have your auto technician examine the vehicle to make a diagnosis.

What Causes a MAF Sensor to Fail?

Contamination is a common cause for MAF sensor failure. With the large volume of air passing through the sensor, dirt, dust and other debris can get into the sensor. A clean engine air filter helps ensure the longevity of the MAF sensor. The air filter prevents contaminants from reaching the MAF sensor.

Can You Drive with a Failing MAF Sensor?

Driving with a bad MAF sensor can cause many drivability issues like misfires, stalling, rough idling or poor acceleration and can contribute to reduced gas mileage. For those who live in a state that does emissions inspections, a failing MAF sensor can result in a failed emissions test. To ensure that your vehicle runs in top condition, you should avoid driving with a faulty MAF sensor. If you suspect there is a problem with your MAF sensor, have your auto technician check it out.

Learn more about quality brakes, find your car part, or find where to buy your auto part today.

The content in this article is for informational purposes only. You should consult with a certified technician or mechanic if you have questions relating to any of the topics covered herein. DRiV and its affiliates (including Federal-Mogul Motorparts LLC) will not be liable for any loss or damage caused by your reliance on any content.