http://www.aa1car.com/library/ford_lean_codes.htm
It's an O2 sensor code
Trouble code P0171 means: System Too Lean (Bank 1)
Trouble code P0171 means:System too lean (Bank 1)
Trouble code P0171 means: Fuel Trim Lean (Bank 1)
Trouble code P0171 means: Fuel Trim System Lean (Bank 1
dtccode.com : Evaporative Emission Control System Pressure Sensor High Input
evap leak small check gas cap may not be tight
dtccode.com : Evaporative Emission Control System Pressure Sensor High Input
If you get DTC code P0171 or P0172 then It could be Mass Air Flow sensor gone BAD. Clean it or repalce it.
P2195 - stall at idle after a cold start P2195 - front HO2S signal stuck lean P2195 - may be displayed in case of " stuck rich "
usually that code is a hose off or cracked
The DTC code P2195 indicates a problem with the air-fuel ratio sensor, typically related to the upstream oxygen sensor on bank 1. To fix this issue on a Ford Explorer, start by inspecting the wiring and connectors for any damage or corrosion. If everything looks fine, consider replacing the air-fuel ratio sensor. Additionally, check for any vacuum leaks in the intake system and ensure that the engine is running properly, as these can also affect sensor readings.