not saying the same thing will happen to you but when i brought a maf from VW - it went faulty after 5 months and they woudnt exchange it as they would have to do diagnostic checks on the car - and as its not a VW - they wouldnt touch it -

went to seat and brought a new one but they wouldnt take the old maf(and take money off) as the last letter was different -
 
just a quick question when you say maf do you mean the air mass meter by the air box or is it something else