P2195 - O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 1)

WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 2021 Lincoln Navigator, 2021 Lincoln Nautilus, 2021 Lincoln Corsair, 2021 Lincoln Aviator, and 2021 Ford Transit-350 HD. However, it is still accessible from the selected car via links, so may be relevant.

DTC DESCRIPTION P2195 - O2 SENSOR SIGNAL BIASED/STUCK LEAN (BANK 1 SENSOR 1)

Description:	A heated oxygen sensor bank 1, sensor 1 (HO2S11) indicating lean at the end of a test is trying to correct for an over lean condition. This DTC sets when the fuel control system no longer detects switching for a calibrated amount of time.
Possible Causes:	Water in the harness connector UO2SPC11 circuit open (if equipped) HO2S11 circuit open (if equipped) Corrosion Incorrect connections Low fuel pressure or running out of fuel EVAP purge valve stuck open Biased MAP sensor signal (if equipped) Incorrect learned ethanol content Air leaks after the mass airflow (MAF) sensor (if equipped) Contaminated MAF sensor (if equipped) Vacuum leaks Positive crankcase ventilation (PCV) system is leaking Incorrectly seated engine oil level indicator Leaking gasket Camshaft timing Exhaust leaks before or near the universal HO2S11 (if equipped) Exhaust leaks before or near the HO2S11 (if equipped) Damaged universal HO2S11 (if equipped) Damaged HO2S11 (if equipped)
Diagnostic Aids:
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to Pinpoint Test H.