Ok, an o2 and a air/fuel sensor are not the same. a p1155 will only appear on a CALI spec es300 which has air/fuel sensors. Heater circuit malf codes 99% of the time need a new sensor.. im not sure about the p1153. Bank 1 and bank 2 are each of the heads, so youre getting codes for both the front and rear head sensors. and yes they are the ones in the exhaust manifolds.