02 SENSOR LOW O2 CONCENTRATION

SYMPTOM
P2091 - 02 SENSOR LOW O2 CONCENTRATION

POSSIBLE CAUSES
- CHECKING CIRCUIT INTEGRITY
- ECM
- O2 SENSOR
- O2 SENSOR CIRCUIT SHORT TO GROUND
- O2 SENSOR CIRCUIT SHORT TO VOLTAGE
- O2 SENSOR CIRCUIT SHORT TOGETHER
- O2 SENSOR OPEN CIRCUIT
- POWER SUPPLY OPEN
- INTERMITTENT CONDITION
- TEST ACTION