Just bought a used 01 maxima, check engine light was on for bad 02 sensor bank 2 sensor 1. I replaced it, then got the code for etc sensor was bad and replaced it. Now I'm getting the same etc sensor code and a ignition code, almost everytime I drive it while driving it will start stumbling like it's going to die and sometimes does those codes will pop up. Took it to the mechanic he says it needs a new engine wire harness and possible computer. Any other thoughts out there. Sorry for the long post