P0174 lean bank 2 it was both now just 2?

I replaced both o2 sens, pcv and hose, MAF.

WHAT is m.o.o.t.

It pretty much means STOP replacing parts , until the CAUSE of the code(s) are PROPERLY diagnosed. CODES DO NOT=PARTS. go back to my first reply. Need scanner.

Well Found it Just turned into here we go again. Its back to PO174 and PO171. Its been checked with smoke ( no leaks ) and the code tester and it just passed smog just before the codes came back and the lite came back on. Im lost now.