The "PBT-GF30" designation is not a part number but rather the designation of the material used according to
Where can you get the “PBT-GF30″ airflow meter? — Air Mass Meter-Blog.
Gosh only knows where that MAF came from and it is certainly not surprising that the ECU should be confused by its signals. I don't suppose you have any idea if the engine has been tuned to run a program that interprets the signals from this part do you? I ask because one approach is installing the correct MAF part but that will only work if the ECU program is also original...or is flashed back to its "correct" state.
If you Google "PBT-GF30 MAF" you'll see all sorts of car makes complaining about what must be a part having that part number ... VW, Alfa, Ford, etc. My guess it is from someone who buys plastic parts and attempts to duplicate what Bosch does but with suspect quality control.
Look at the bottom of
checkenginelightcausedbymassairflowsensor - mikefocke2 to see what a real one should look like. Note all the extra lettering, the Bosch name, part #, etc.