DTC P0171, P0174: Notes

DTC P0171  : Rear Bank (Bank 1) Fuel System Too Lean DTC P0174  : Front Bank (Bank 2) Fuel System Too Lean

How to use this manual .

NOTICE:  

Before you troubleshoot, review the How to Troubleshoot .

NOTE: 

• Do not clear the DTC or reset the PCM before beginning this troubleshooting procedure until instructed to clear it. Clearing the DTC or resetting the PCM can delete valuable diagnostic information, even if the on-board snapshot is saved.
• Inspect for aftermarket fuel system and engine components before beginning troubleshooting.