Gramdacious

iTrader: (1)

I just put on a Warpspeed Y pipe, bpipe, and rear section. Now I got a "rear heated O2 sensor" code, and a knock sensor code. I determined that my stock cat is bad. so does this explain the rear heated O2 sensor code? I've pulled the knock sensor code before but I can't notice a difference in driving. Anyone had this code before?