Yes, codes 44 and 45 are O2 sensor codes. I think code 45 is drivers side, but I wouldn't swear to it. Keep in mind that 14CUX is a very basic fuel management system that needs some interpretation. A code 45 means that the ECU could not adjust the fueling to it's liking on that bank. It does not necessarily mean a bad O2 sensor, there could be an ignition misfire, air leak, exhaust leak, etc. that can trip the fault. I would look closely at the ignition system for any sign of misfiring as well as tightening the connector pins in the O2 sensor plugs...they are known to get loose and cause intermittent connections.