vag codes help!

so i threw the same code again today (twice)

17536 - Fuel Trim: Bank 1 (Mult): System too Lean
P1128 - 35-00 -

this one i always get every couple days or so


theres a couple other random ones that have come up besides these but i need to know what would be causing these...

im thinking possibly a bad maf as ive been told before. As I stated in a different thread if i run a full bov i dont get the system lean code because im obviously getting rid of the air and theres extra fuel for it already. Its getting annoying to keep getting these so help plz lol...