My 02 A4 1.9 TDI has developed a problem with the fuel gauge, at first it started to show intermittant false readings ie. full when half full but apart from the odd occasion the needle is now past the full mark, as I use fuel it does go down slightly but is showing much more than is actually in the tank. The dash comp appears to be showing the correct amount in miles available before the tank needs filling, any ideas please? Im thinking faulty sender but Im guessing.

Dave