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Okay so I took the air filter out and used a inspection mirror to inspect the MAF sensor housing from the air box, what I found was that the honey comb mesh screen is half missing and the other half is very dirty and mostly clogged, and it happens on the MAF sensor hot film side blocking the air flow. I remember someone said in the forum that he found a cigarette pack and some other stuff stuck there causing his car throwing those fuel mixture codes, this might also be the reason that I got these codes.
I will remove it from the car when I have time and see if I can savage the MAF sensor housing. Besides to prevent foreign objects to get into the intake tube, does that honey comb mesh screen has any other purpose? I mean it certainly can reduces amount of air into the intake tube comparing without it, correct? So if I remove the half remaining screen, would also cause more air into the intake than the design?
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