It means system too lean, this is usually a vaccum leak, but could be a faulty MAF (mass air flow) sensor. This code is for Bank #1, right side of engine. I removed intake plenum and found oil in sparkplug tube and bad spark plugs. this fixed problem.
Trouble code P0171 means:System too lean (Bank 1)
Trouble code P0171 means:System too lean (bank 1)
Trouble code P0171 means:System too lean (Bank 1)
Trouble code P0171 means: System Too Lean (Bank 1)
Start with looking for a vacuum leak.
P0171 = System too Lean (Bank 1). I would start by looking for a vacuum leak under the hood.
Trouble code P0171 means: Fuel System Too Lean (Cylinder Bank 1)
Trouble code P0171 means:System too lean (Bank 1)
po171--- system to lean (bank # 1)
Trouble code P0171 means: System too lean (Bank 1)
Trouble code P0171 means:System too lean (Bank 1)
Trouble code P0171 means: Fuel System Lean (Bank 1)