My 05 cobalt ss/sc keeps resetting the codes for O2 sensor... P0133 - B1S1, P0172 - Fuel system rich, P1133 - Insufficent switching. I have replaced the O2 sensor with OEM three times and replaced the pigtail with OEM. Any ideas why or what could be causing this? I have also replaced MAF, MAP, and almost all the evap sensors, also I have replaced all 4 injectors with OEM parts. In desperate need of advise!!!