O2 Sensor Issue/dilema

mercredi 19 août 2015

So recently my 04 (54k) started having the stalling issue while driving. I drove it home, parked it, and started tearing it apart. It is bone stock (except for sohn) with what i would assume are the original coils. So, I 86ed those in favor of new BHRs, MAF is cleaner than a whistle, so next would be the Cat.
The screen (header side) apears to be fine, the cat has no broken peices inside( no rattle while shaking it) but light will not shine through it. I know there is a bend after the cat, but i figured i should still see SOME light. Either way, BHR Midpipe it is!!!

So my question is, the stock 02 sensor is welded to the cat... Is the 02 sensor needed? Ill get a CEL with one, but what would happen if there was nothing there? Plug the hole in the midpipe, then what would happen?


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