DTC : P0161: General Description
A heater for the zirconia element is embedded in the front secondary heated oxygen sensor (secondary HO2S (bank 2, sensor 2)), and it is controlled by the powertrain control module (PCM). When activated, it heats the sensor to stabilize and speed up the detection of oxygen content when the exhaust gas temperature is cold. If the front secondary HO2S (bank 2, sensor 2) heater draws other than a specified amperage, the PCM detects a malfunction and stores a DTC.