the engine computer (PCM) turns the "Check Engine" light (MIL) ON and sets the trouble code P0171 - System Too Lean for Bank 1 and (or) P0174 - System Too Lean Bank 2, depending on which cylinder bank is affecte
The Check Engine light with the code P0101 could be caused by a dirty or badmass airflow sensor. The code P0171 could also be present. Other possible causes include avacuum leakfrom a ripped intake manifold boot, cracked PCV hose or bad PCV valve. The repair will depend on the diagnosis...