I had a Cali spec 00 max throwing a CEL ...according to autozone the precat was throwing the CEL... I bought a used bank 2 exhaust manifold and a O2 simulator in case removing the precat was going to give me problems. Turns out replacing the precat was a headache and I finally got the thing off and replaced it after busting 3 of my knuckles, plus I'm not very good at splicing sooo... 25 dollars and free shipping to whoever needs a O2 Simulator. I know my story was long, but hard work pays off and I proved it! Just that this makes the hard work much much easier! -$25 + 0.00 S&H= a deal! goes for 25.99 + 2.50 S&H on ebay