o2 sensor

Hello guys, I have a 2013 Kizashi. I has a 'service engine' and a check engine light, so I went to a local mechanic and got the codes checked. It turns out the codes are: P0037 - HO2S Heater Control Circuit Low (Bank1 Sensor2) & P0138 - O2 Sensor Circuit High Voltage (Bank1 Sensor2) What part...