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If one bank is running lean it usually means that you have a vacuum leak somewhere on that side. Check for broken hoses that connect to that side or possibly broken gaskets. changed all hoses what gasket
Bank 2 running too lean.
P0171 System too Lean (Bank 1)
System Too Lean On (cylinder Bank No.1)
How to fix bank 1to lean on a 3100 v6
Just had this problem. I replaced the oxygen sensor and it appears to be running fine.
Bank one is "LEAN" - get a good bottle of Fuel Injector Cleaner and see if that helps.
Trouble code P0171 means:System too lean (Bank 1)
Trouble code P0174 means: Fuel System Too Lean (Cylinder Bank 2)
That code is telling you that bank two is running too lean. For some reason the fuel mixture is too lean. Possibly an o2 sensor is malfunctioning.
P0174 - SYSTEM TOO LEAN ( Bank 2 - drivers side of engine )
Computer getting signal from oxygen sensor that bank 1 is running too lean. System has reached the limits of it's fuel enrichment capabilities. Many possible reasons; vacuum leaks, defective or coated sensor, etc. Easily searched: p codes Lincoln