DTC P2195: O2 Sensor Signal Biased/Stuck Lean - Bank 1, Sensor 1
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. This DTC sets when the fuel control system no longer detects switching for a calibrated amount of time. |
Possible Causes:
Electrical:
- HO2S harness short to voltage
- Water in the harness connector
- HO2S circuit open
- UO2SPC circuit open
- Corrosion
- Incorrect connections
- Damaged HO2S
- Damaged PCM
Fuel System:
- Excessive fuel pressure
- Leaking or contaminated fuel injectors
- Leaking fuel pressure regulator
- Low fuel pressure or running out of fuel
Evaporative Emission (EVAP) system:
- EVAP purge valve stuck open
- Air leaks after the mass airflow (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
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| Diagnostic Aids: |
| Application |
Key On Engine Off |
Key On Engine Running |
Continuous Memory |
| All |
GO to PINPOINT TEST H
. |