car's done 60k, (last 1800 miles with revo)
its 2 screws, a hoseclip, and a plug.. thats it ! 20 minute job to replace at most.
diagnosing the fault probably takes longer. however.. if vw tell you your maf sensor needs replacing, ask them for a refurb'd one ! ?75 is a lot easier on the wallet than ?250 and still comes with full warranty.