Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSFORD2009FUSION SEL, 3.0 1, FWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID)DTC DIAGNOSISDTC P2195: - O2 SENSOR SIGNAL BIASED/STUCK LEAN - BANK 1, SENSOR 1

2009 Ford Fusion SEL, 3.0 1, FWD

DTC P2195: - O2 Sensor Signal Biased/Stuck Lean - Bank 1, Sensor 1

2009 Ford Fusion SEL, 3.0 1, FWDSECTION DTC P2195: - O2 Sensor Signal Biased/Stuck Lean - Bank 1, Sensor 1

DTC P2195: - O2 SENSOR SIGNAL BIASED/STUCK LEAN - BANK 1, SENSOR 1

Description:	A heated oxygen sensor (HO2S) indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.
Possible Causes:	Electrical: Short to VPWR in the harness or HO2S Water in the harness connector Open/shorted HO2S circuit Open UO2SPC circuit Corrosion or incorrect harness connections Damaged HO2S Damaged powertrain control module (PCM) Fuel System: Excessive fuel pressure Leaking/contaminated fuel injectors Leaking fuel pressure regulator Low fuel pressure or running out of fuel Vapor recovery system Intake Air System: Air leaks after the mass air flow (MAF) sensor Vacuum leaks Positive crankcase ventilation (PCV) system is leaking or the valve is stuck open Incorrectly seated engine oil dipstick Exhaust Gas Recirculation (EGR) System: Leaking gasket Stuck EGR valve Leaking diaphragm or EGR vacuum regulator Base Engine: Oil overfill Camshaft timing Cylinder compression Exhaust leaks before or near the HO2S
Diagnostic Aids:
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	-	GO to Pinpoint Test H .	GO to Pinpoint Test H .

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.