[Bigdrumma22]

Originally Posted by 96greengt

Ford's 02 sensors have a tendency to learn lean and rich conditions which lead to slow/lazy readings and ultimately failed sensors. The above poster obviously did a copy and paste from a google search I imagine and is correct in a sense for factory tables and stock applications, however, when you change things that modify air flow in and out (along with other supporting mods) the PCM can only compensate for so much, that is when the custom tunning comes into play.

If it is worth anything to you, my MIL will turn on on occasion (giving me a lean code for bank 2). I know there are no vacuum leaks, much less over filled oil, exhaust leaks or failed/lazy 02 sensors (in fact, mine are quite active).

Running with it untuned may or may not result in a failed 02 sooner or later, but then again, many repair shops will recommend replacing them every 30-60k miles, depending on applications.

Yeah, that's basically what I replied to him. All that stuff on a stock engine I'm more likely to look for, but since it has all the bolt-ons I would easily look past those things, especially since it all occured when I added the final pieces to the bolt-on puzzle. It came on that first time after the install and it went away on it's own, but this time it stayed on, so I guess it had enough. I'm pretty sure I have no vacuum leaks, at least no obvious ones. Oil is fine. You said there were no exhaust leaks, so I'll trust you on that, because you have an ear for it. How can it cause o2 failure? And you don't have the luxury of the genesis anymore, right??