This is important for two reasons, the first is that they are expensive, and the second is that it only takes a few minutes to test one with a multimeter.
Here’s a video on how to test one without pulling it. MAF Sensor Failure– While it is very likely that the MAF sensor itself could be the problem, it’s absolutely necessary to test it before you replace it.Here’s a great article on exactly how to clean one from Family Handyman.
They can be cleaned, but it’s easy to mess one up by handling it wrong, and you don’t want to use a wire brush.
MAF Sensor Dirty– Over the course of its life, the MAF sensor will often get so covered in grime that it’ll no longer get an accurate reading. They are presented loosely in order from most to least likely: Here are the most common causes of P0102 in the Mazda 6. Usually, one or more of these symptoms will occur, but it’s not uncommon to have no symptoms other than the check engine light. Since P0102 has to do with the Mass Airflow Sensor, which is a huge part of the 6’s engine combustion process metering, it is going to cause noticeable symptoms. Related: Mazda 6 P0101 Diagnosis: MAF Sensor When it is not getting the proper reading, it can really cause issues with your 6. The engine’s computer uses this reading to determine the exact amount of fuel that it needs for optimal combustion. It measures the air density and volume between the air filter and the intake manifold. It’s important to understand what the MAF sensor does. It should be considered a high priority to fix, as the MAF sensor not reading properly can really make an impact on the performance of the vehicle. We will cover exactly what that means and potential fixes for it below. It means the the Mass Air Flow (MAF) circuit is low, and that it is not performing within its specified operating range. 
P0102 is a very common trouble code with the Mazda 6.
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