Guys I need help, I'm retarded.
My upstream O2 sensors were plugged in downstream because the idiot that I bought the headers off of welded a cap thread to the upstream bungs. I can't find any adapter that fits...
Do I just saw the bastard off or what, I don't have any welding tools...
if the sensor is before the cat its still upstream, that port is for emissions controls. headers commonly have the upstream bungs in the collectors so it is reading an average of all cylinders in that bank instead of getting data from one.
yep the ports in the primary tubes are for air injection and egr.
do you have a graphing or datastream capabhle scan tool? compare maf/map readings with o2 sensor voltage and stft. if it the engine is getting unmetered air (vacuum leak, leaking gasket in intake tract etc) the ecu might interpret this as a faulty o2 because the o2 sensor output is conflicting with the other sensors data and fuel map.