These sensors use both a hot wire and a cold wire, where the cold wire functions as a reference for the hot wire. The engine control module (ECM) measures this change and alters the tune accordingly. As the air passes over the hot wire, it is cooled, decreasing the wire’s resistance to voltage. A hot wire MAF sensor uses a platinum wire located in the path of air flow, which is heated using specific voltage. There are two main types MAF sensors- hot wire and cold wire. Inside the sensor box is the hot wire, which is inside the post sticking out into the center of the housing. Here’s how to clean your MAF sensor for better performance and better overall engine health. It is best to get ahead of any problems by giving your MAF sensor a little attention. This is a very important sensor that typically does its job consistently without issues, but that doesn’t mean it can be ignored forever. Air density changes with temperature, altitude and forced induction (supercharger/turbo applications), making density more important than air volume flow rate. While the MAF sensor does not directly measure the actual flow rate of air, it measures the density. This is the device that measures how much air is coming into the engine so that the computer can determine how much fuel it needs to inject. Most modern EFI engines have a Mass Air Flow (MAF) sensor located in the air intake of the engine.
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