Initially I did not think this was too critical, keeping in mind how thin the screen is. However having replaced my MAF only last Friday I still have the faulty unit and decided to examine just how it is setup.Even though it is fairly open weave, it WILL affect the air distribution pattern, downstream of the mesh.
This is not logical. More air will not pass the sensor! The engine will STILL only draw in the amount of air it needs. The displacement of air or the distribution pattern may change slightly, but there will not be an increase in air mass.If your mesh is partially missing, then more air will bypass the central sensing tube and the MAF reading will be incorrect.
From my limited, though recent venture into the realm of MAF sensors I would not recommend the adaptive reset. I chose to do this adaptive reset during my MAF foray and it made the already poorly running engine MUCH worse. It partly recovered after a few kilometres of driving, but due to the faulty MAF sensor, the values could not recover properly. Replacing the sensor IMMEDIATELY improved the engine operation and I did not have to do anything with the RCL (Rovacom Lite) to "adjust" the running conditions - it just adapted.I would remove the mesh and run an adaptive-reset in the ECM