Most of the times this is a result of a dirty mass air flow sensor. It is located in the air inlet hose at the air filter housing and has a connector with 3 wires on it. Clean it with brake cleaner or electronics cleaner.
Trouble code P0171 means: Fuel Trim System Lean (Bank 1) Trouble code P0174 means: Fuel Trim System Lean (Bank 2)
Trouble code P0171 means: System Too Lean (Bank 1)
P0171 - system too lean ( Bank 1 ) - passenger side of engine P0174 - system too lean ( Bank 2 ) - drivers side of engine
broken MAF sensor, easy fix... it's on the intake right after air filter... second option is that the engine gets false air through broken hose...
Trouble code P0174 means:System too lean (Bank 2)
Trouble code P0174 means: System too lean (Bank 2)
Trouble code P0174 means:System too lean (Bank 2)
Trouble code P0174 means: System too lean (Bank 2)
Trouble code P0174 means: System too lean (Bank 2)
Trouble code P0171 means:System too lean (Bank 1)
Trouble code P0171 means: Fuel Trim System Lean (Bank 1)
Trouble code P0174 means: Fuel System Too Lean (Cylinder Bank 2)