Cleaning the Mass Air Flow Sensor?

I have a 2004 Ford Freestar. The check engine light came on. I had the problem code read and received a P0171 and P0174 readout. I was told to either replace or clean the Mass Air Flow sensor. The Freestar has the 3.9 liter engine and I'm not sure where the MAF sensor is located.

171/174 indicates lean condition in engine. the mass air flow sensor is located in the rubber tube going to throttlebody. you can try to clean it. using mild carb cleaner safe for sensors, remove sensor from tube. spray clean the tiny wires located in the cylinder. do not touch them, they are very delicate. these engines are also notorious for leaking intake gaskets and faulty pcv valves. these will all set these 2 codes. feel free with anymore questions.