Got the info here from that link
P0155.02 Sensor Heater Circuit (Bank 2, Sensor 1)
P0141.02 Sensor Heater Circuit (Bank 1, Sensor 2)
Bank 1 = Rear (cylinder 1-3)
Bank 2 = Front (cylinder 4-6)
Sensor 1 = Primany, before cat
Sensor 2 = Secondary, after cat
So I need rear stream of Primary...