Adding to my other thread, my o2 sensor died and I got the heater cel and some bad circuit cel already...so to prevent anything from grounding out for a few days until I can get a new one or do the simulator will my car go into limp mode if I unplug the rear o2 sensor harness?

 

No.

 

Nope. I removed the entire rear 02 on my car. Took me a couple tries to get everything right on the 02 and heater simulation resistance but once i did no more CEL and never went into limp.