Hello guys I just bought a 87 Regal with a Grand National swap. I took it in for emissions and it failed. The scanmasters is throwing a code 45. Were should I start with this? Also on my scanmaster i didnt see a 02 section so im not sure what the o2 sensor is reading. I pulled the o2 sensor out and it was pretty black. Im gonna clean and see if that helps, until I can get a new one. I believe its a Bosch and from what Ive been reading they are crap on these cars and I should find a AC Delco or Denso for it. Any help will be a appreciated.