Hello All,
Been searching, researching... beating my head against this!!!
Basic info
2002 Z06
LG long tube headers, no cats (installed 3 years ago...)
Vararam (installed 3 years ago)
Replaced O2 sensors today ... (previously replaced o2s 4 months ago)
The problem started off as the passenger OS2 flat-lining voltage at 5ish mV all the time... closed or open loop. The car ran terrible obviously when in closed-loop, but runs fine in open-loop.
Since the o2s were only 4 months old I thought it was the LG flat-to-square o2 adapters (see pic1)... so I replaced them. After replacing them I kept blowing the o2 fuse (#15). SO I unplugged the the o2s from their wiring and the fuse stopped blowing. Now I thought one or both of the o2s had shorted. I bought new o2s again and installed them today. The fuse stopped blowing... BUT now my car won't go into closed-loop and the o2 voltages stay right on 450ish mV. I also have DTCp0134 and p0154 (02 circuit no activity detected) errors.
I have tried flashing back to the factory tune... and even doing a write all (scary...). Nothing works. Again the car runs fine in open-loop.
Any advice would be greatly appreciated, I am losing my mind over this.
pic1.png3-7-2022.hpl