I had been having sputtering issues in my 2004 2.4l TJ for quite some time. I finally changed the O2 sensor, and that fixed the problem for a few days. RevCo666 let me know about the problems with Bosch, and shortly after learning about these issues I began to experience them. My Bosch sensor threw a CEL 2 weeks after I installed it. Buy NTK!!!!!! In case those discount codes are expired or will expire soon, I have this one: 1574541712895315. Enter it the same way, in the "how did you hear about us" blank, then press Apply. Thanks education by the way RevCo.