Ill try and keep it short.....
ME - Called VW up, can you check when I purchased a MAF sensor from you
VW - it was less than 2 years ago so still under warranty
ME - Ok, do I just bring the unit in?
VW - No we need the car and to test the unit
ME - test it with what, VAGCOM?
VW - Yes
ME - I have tested it with VAGCOM and the MAF doesn't throw up a fault code, but if you unplug the electrical connector the car improves massively (so logic would suggest the MAF sensor is at fault, started to get a bit annoyed by now)
VW - Well if we scan it and there are no faults relating to the MAF, we will charge £65 then VAT
ME - But I have said there are no MAF related fault codes.
VW - Well bring it in and we will scan it
ME - are you not listening to what I am saying, repeated above.
VW - but if it does show a MAF fault we wont charge the £65 and get the part replaced.
ME - banging head against brick wall - I'll call tomorrow
Called another VW and they said bring the unit in and we will send it to VW and they will test it, if they find its faulty they will replace the unit if not they will return it and I can collect it.
MADNESS!