A code P0102 may mean that one or more of the following has happened:
The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:
Since you have replaced the maf already you will need a scanner to watch live data stream for the mass air flow sensor. While watching the data assuming the parameters are correct(maf reading correctly). Watch the maf reading while you wiggle the connector, wiggle it slightly,hard, pull the wires but not so hard that you rip them out , while watching for an erratic reading. If nothing then you will need to follow the sensor wires while watching the data and looking for any exposed wire. The most common problem besides the sensor itself is the connector.