02 ss 45,000 miles just did motor mounts and pacesetters. heres the problem i'm not running cats and have no sims or a tune for the rear 02s. i have no check engine light nothing drives mint. if i hook up my scanner it shows both rear 02s not working?????? when my air pump was disconnected again no check engine light car ran mint. i have no clue??? everything lights up with the key on the light is working. please help