DTC P0150: Ho2S Circuit Malfunction - Bank 2, Sensor 1: Description

PCM supplies a bias voltage of about 450 mV between Heated Oxygen Sensor (HO2S) high signal circuit and HO2S low signal circuit. When measured with a 10-megohm DVOM, this may display as low as 350 mV. Oxygen sensor signal varies from about 1000 mV when exhaust is rich, to about 100 mV when exhaust is lean. If HO2S 1 voltage remains at or near 450 mV bias for an extended period of time, DTC P0154 is set. If signal amplitude of HO2S bank 1 sensor exceeds lack of activity thresholds, such as DTC P0134, but will not allow closed loop operation, DTC P0150 will set.