DTC P0130: Ho2S Circuit Malfunction - Bank 1, Sensor 1: Description

PCM supplies bias voltage of about 450 millivolts (mV) between HO2S high and low signal circuits. The HO2S voltage ranges from about 1000 mV when exhaust is rich to about 100 mV when exhaust is lean. PCM monitors and stores sensor voltage information and evaluates voltage samples to determine amount of time sensor voltage is out of range. If signal amplitude of HO2S bank 1 sensor exceeds lack of activity thresholds but will not allow closed loop operation, DTC P0130 will set.