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. The test fails when the fuel control system no longer detects switching for a calibrated amount of time. |
Possible Causes:
Electrical:
- Short to voltage in the harness or HO2S
- Water in the harness connector
- Open UO2SPC circuit
- Corrosion or incorrect harness connections
- Damaged universal HO2S
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
Base Engine:
- Oil overfill
- Camshaft timing
- Cylinder compression
- Exhaust leaks before or near the HO2S(s)
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| Diagnostic Aids: |
| Application |
Key On Engine Off |
Key On Engine Running |
Continuous Memory |
| All |
GO to PINPOINT TEST H
. |