DTC P0171 System Too Lean (Bank 1)
WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Refer to DTC P0172 for diagnostic procedure. < Refer to DTC P0172 SYSTEM TOO RICH (BANK 1) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >