The DTC codes do not show codes up nothing like a fault reader can.

P103 relates to a MAF sensor, these get clogged up and need cleaning, although be careful when do so as they are delicate and are made up of thin wires, check the wiring connector while here and make sure it hasen't been "Knocked"

I do not see why the starter and battery were replaced if there was nothing wrong with them as these are not servicable items other than checking the electrolyte in the battery, checking connections for corrosion etc?

Martin