How many miles on it? At that age it's likely a bad downstream o2 sensor as the p0138 suggests. How does it run otherwise?
103,000 miles and your right it was the O2 sensor downstream it's already fixed. Posted via the PriusChat mobile app.
Why not do readers a favour, google the codes and post the associated info? P0138 = Oxygen Sensor P0607 = Control Model
Also, I like it when people post images of parts that they have issues with too, some thread, people just describe the part but no pictures to help them out with