My check engine light just came on. I checked the error code with a scanner and it said:

P2240 O2 Sensor Positive Current Control Circuit Open - Bank 2 Sensor 1

I was wondering if someone could tell me what this meant. Is it likely that I need a new sensor or could something else be wrong. If I need a new sensor, is it something I can change myself, and where can I find instructions for how to change it?

Thanks.