try clean it like in your other post - theres 1 or 2 screws on the AFM which will let you remove the actual sensor unit.
Youll see the sensor, kinda like a bit of wire, spray the cleaner on this and the air will evaporate it all..
Clean it a couple times, let it dry then put it back in and try

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MY02 WRX STi - sold :(
'12 Golf GTI