The code interpretation in the generic reference book was bank 2 sensor 2
high and low voltage malfunction. I repalced the o2 sensor adjacent to the front passenger wheel well. I think it was on the Y-pipe. It matched the sensor I was given by the dealership. Did not seem to help though. Every 50 miles or so I get these two codes reappearing p0138, p0139. What could this be? Thanks.