Hey Scotty my name is Layna.
I have a question for you about an O2 sensor. I just replaced the bank 1 sensor 1 on a customers 2007 Hyundai Tucson and it's coded again. Any ideas as to what is going on?
Thanks so much!

many things can trip that code besides a bad sensor. Rich fuel, lean fuel, misfire, oil burning engine, exhaust system air leak, weak fuel pump. Now comes the hard part, figuring out which one. Good luck