The heater coil is probably gone bad in your O2. You can check it be disconnecting the O2 and checking for resistance.

There should be four wires, two for the ECM(power and ground) then the other two for the heater. Unplug the O2 and put an ohm meter on the two pins for the heater on the O2 sensor. Compare your resistance to what Acura says is good. If you see out of range or no resistance at all then you know it's the O2 and not the wiring.

A p1457 is for the electrical circuit that controls the purge or vacuum vent valve. Here you would disconnect the connector and see if you have power and ground through the wires. Also check for continuity between the connector and the ECU.