Here's what happened to me. Anyone who can offer some help, it's much appreciated.
I started fooling around with anti-lag through openecu tools. Lots of pops and bangs.
Then, I get a CEL. Code said some missfires and whatnot (expected) and I also got the P0171 lean conndition. I then immediately deactived the ALS map and I cleared the codes. Now I only have P0037 (rear O2 sensor). The car seems to work fine other than it's a little lumpy at idle.
Oh BTW, I am catless. In Enginuity, I also have the P0037 CEL box UNCHECKED but for some reason I am still getting that code... front O2 sensor gone perhaps? If so, why would I be getting the rear O2 code?