I changed the o2sensor but the code comes back

Question

The p0053 code is on my actron pocket scan twice but the second one has a symbol of some sort

Answer 1

P0053 H02S heater resistance circuit Bank 1 Sensor 1

The second symbol that the Actron scanner has is Pd Or PD which means it is pending, Even if a code is set it can still pend, What the ECM does is look for open circuits, grounded circuits, rationality, when P0053 set it due to the ECM detecting that the heater voltage is 9- 18 volts for more than a predetermined time.