P0131 Code – O2 Sensor Circuit Low Voltage Bank 1 Sensor 1

Code P0131 Possible Causes
Front Heated Oxygen Sensor Bank 1 harness is open or shorted
Fuel contamination
Low or high fuel system pressure
Engine vacuum leaks
Exhaust gas leaks
Faulty fuel injectors
Faulty Heated Oxygen Sensor HO2S Bank 1 Sensor 1
Fuel contamination

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