Hey guys was wondering if some one could help me out.I recently got my lt1 swap finished and on the road,now the engine light came on.I had it checked and it said low o2 reading bank 1 sensor 2.Now I only have the front o2 sensors hooked up and the computer was set up to ignore the back two after the cat.Does bank 1 sensor 2 mean before or after the cat?

 

"bank 1 sensor 2 " means o2 sensor downstream or 2nd sensor after the cat.."bank 1 sensor 1" means before the cat.............even if your light is on due to the 2nd O2..don't worry its not a big deal..sensor 2 is only there of catalytic efficiency..its does not have any effect on air/fuel ratio..hopefully this answers your question