Mass Air Flow (MAF) Sensor

What is a Mass Air Flow (MAF) Sensor?

The Mass Air Flow (MAF) sensor measures the amount of air that enters the intake system of the internal combustion engine. There are multiple types of Mass Air Flow sensors but the most popular type is hot wire sensors. Often times, an internal air temperature (IAT) sensor is also installed within the MAF sensor.

How Does a Mass Air Flow Sensor Work?

The mass air flow sensor sits inside of the intake snorkel connected to the air intake box. Inside of the MAF sensor is a very hot wire. The air flowing through the intake snorkel from the air intake box cools that hot wire down. The more air that flows through, the more electric current the hot wire needs to stay at its correct temperature. Why does this matter? The amount of electrical current that is going through the wire is sent to the Power Control Module and used to calculate the amount of fuel that is required to maintain an optimal air/fuel ratio. Not only does this air flow sensor optimize the air/fuel ratio but also to determine the shift points in the transmission and also lowers the amount of exhaust emission.

Was this post helpful?

Comments 4

LEON F GUYOT

August 15, 2018

Good Advice

Amber

November 11, 2018

I have changed it twice and still i get this reading, why?

Alisa

May 23, 2019

Is GREAT! Very helpful my 7 year old knew exactly what to do to fix it. The group of you dissing this product want a mechanic to come with it, an fix it for free. Really have must try for yourself. Thanks awesome help.

Brian Johnson

October 20, 2019

I know my 2013 Chevy Cruze has a bad PCV, which is built into the valve cover. It was replaced a year ago. The shop said it is still under warranty and they will change it free. But the codes say nothing about PCV. One is Mass Air Flow Sensor, another is Fuel Trim System Lean Bank 1, and Oxygen Sensor Delayed Response Lean to Rich Bank 1. Are these a function of the PCV being bad?

en English
X