I have a '98 explorer with a 5.0 engine (112K miles) and the check engine light keeps coming on. I check the codes and it says 1/2 and 2/2 catalyst on left bank. I talked to someone in the auto parts store and they said it was the catalytic converters were going bad. I replaced them and the code still keeps coming up. Can it be the oxygen sensors are bad? Also, I hope I replaced the correct side of catalytic converters. What side is the left bank? Thanks for any help you can give.