Today my CEL came on. When I got home I read the codes P0174 to lean bank 2, P0153 o2 sensor slow response bank 2 sensor 1. I erased the codes and drove about 10 miles and light has not come back on. Is this anything to be concerned about?

 

does the driver side of the engine have an exhaust leak? could be a slight vacuum leak on that side, or could be a lazy 02 sensor. kind of hard to nail down over the internet