Trouble code P0171 means:System too lean (Bank 1)
P1131 = Insufficient switching O2 Bank 1 Sensor 1 Sensor/lean. Could be a B1 S1 O2 sensor going bad.
Fuel system lean bank number 2Fuel system lean bank number 2
what does system to Lean Bank 1 on 740iL 2001 means
Check your EGR valve or see if there are any vacuum leaks. Other than that, no special ideas.
P0171-system too lean bank 1 and P0174-system too lean bank 2
Bank #2 fuel system lean.
P0171 System too Lean (Bank 1)
P0171, system too lean (bank 1). P0174, system too lean (bank 2). Start with checking for a vacuum leak.
Trouble code P0171 means: Fuel Trim System Lean (Bank 1) Trouble code P0174 means: Fuel Trim System Lean (Bank 2)
How to fix bank 1to lean on a 3100 v6
PO171 = system adaptive fuel too lean (bank 1) PO174 = system adaptive fuel too lean (bank 2)