So my car just threw this light as I was backing in my garage...its the cat inefficiency code. yea I have a catless Hpipe..but brenspeed told me they turned off the rear sensors..So i am wondering why this is coming up. has anyone else got this code with rear o2's turned off. I am having the 2 small cats welded in tomorrow so hopefully that will keep it from ever coming back but just find it odd.

 

I had high flow cats put on mine and it still through a code. Said my cats temp was like 1200 degrees which is redic high so i got them turned off

 

I drove it 3 days with the new pipe before the check engine light came on