OK, so I had a split vaccum hose, and the reader said the MAF was faulty. It is unplugged, so I kinda knew it would bring up the fault, however I want to buy a MAF just in case it has gone faulty after I cleaned it. Rang audi and they quoted £160 for one, then went on ebay to see if there were any cheaper and theres loads ranging from £20 to £50 with 12 month warranties. Are these suitable for a replacement, as mine is an AUM engine, and the MAFs on ebay are for AGU. Will there be a difference with the MAF or do I need a AUM part? Any advice appreciated.