Recent content by James Frazier

I'm having the same issue with the COBB catted downpipe. First I got a P0421 CEL code, so I tried the O2 extender with no luck (now I have a P0137 CEL code "O2 Sensor Circuit Low Voltage"). I have also replaced the bank 2 O2 sensor twice. Still the same codes with/without the O2 extender. I've...