DTC P0172, P0175: Notes

DTC P0172  : Rear Bank (Bank 1) Fuel System Too Rich DTC P0175  : Front Bank (Bank 2) Fuel System Too Rich

Special Tools Required 

Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000B or equivalent, commercially available 

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.