I have in front of me a brand new maf sensor for a vag 1.8, the part number is 06A 906 461L. I don't know which model 1.8 it is from but the housing is a little smaller in diameter.
So I took the sensor out and found out the bosch number on the sensor is F 00C 2G2 049. That's the same number as the S3 sensor.
Think this could be a mistake from the factory?