A quick search finds that those codes are "O2 Sensor 1/1 Slow Response (High Frequency)" and "O2 Sensor 2/1 Slow Response (High Frequency)". I believe that is the two upstream O2 sensors.

Can't really find any more about those codes, except this technical set of slides from some presentation, which doesn't seem to spell it out in plain English at any point: http://www.sae.org/events/training/s...alzatorski.pdf