02 Sensor Heater

Wondering if anyone could help me out. I got a check engine light and I took it to Auto Palace and had them run the diags on it and the error code is p0155 "02 Sensor Heater Circuit Malfunction bank 2 Sensor 1."

How diffucult it is to change out this part and if it's not that difficult what's a good reference manual.

This is on a 2002 Kia Sodona LX, 35,000 miles. Would like to do it myself. I am the orginal owner of the Kia don't think it's covered under warenty. Thanks inadvance for any advice.

you are still covered under factory warranty.

5/60000 miles bumper to bumper