P0131 O2 Sensor Circuit Low Input (Bank 1/Sensor 1): DTC Detecting Condition

Item	Detecting Condition	Possible Cause
DTC Strategy	Voltage Range check	Short to ground in signal harness Contact resistance in connectors. Faulty Heated O2 Sensor (HO2S).
Enable Conditions	Lambda regulation on Maximum Limit (50%) Canister Purge valve closed Battery voltage > 10V No relevant failure
Threshold Value	Sensor voltage < 0,02 V and resistance < 30 Ω
Diagnostic Time	60 sec.
Fail Safe	Reset lambda adaptation and fuel trim adaptation. Front HO2S heater is controlled in open loop control. EVAP. Emission control function is controlled in minimum operation mode.
Mil On Condition	2 Driving Cycles