the MAF is the little black box just behind your filter box.... undo the 2 screws and lift it out ...
looks like 2 light bulb filerment if there snapped its fooked but like mine they just had some crud on them...
dont touch them there fragile...spray with carbon cleaner and leave for 10mins so the carb cleaner evaperates...
if theres some crud stuck on them gently clean them with a soft tooth brush or try and blow the crap of.
be careful but it worked a treat and saved my at least £70
Dave