View Single Post
      01-07-2014, 12:25 PM   #37
robertm
Major
450
Rep
1,358
Posts

Drives: 2020 M2 Comp
Join Date: Oct 2007
Location: dfw

iTrader: (0)

I just edited the post I made last year. Figured I'd copy paste in a new post so that people don't miss it.



After speaking with Terry and others I've discovered that over time the O2 simulator will throw the fuel trims out of sinc. This is really just supposed to be a temporary solution (ie get you past emissions testing then take it off). After several months on the car the pre cat sensors will use the post cat sensor signal to recalibrate itself. Since the post cat signal is faked it ends up slowly getting things out of whack. So, I recommend installing for emissions testing, then removing. After that live with the service engine light or go with an after market tune solution to fix the issue. Mechanical O2 spacers would probably work too but I haven't gotten around to trying it.

Last edited by robertm; 01-09-2014 at 09:31 AM..
Appreciate 0