I replaced all four of my O2 sensors on my 2001 Trans Am and after doing so codes p1153 and p1133 popped up. The original codes that I had for the reason of me replacing the O2 sensors were P0171 and p0174 which I did find a major vacuum leak , a bolt missing from my catalytic converter flange and a leak to my pvc hose nipple on passenger side valve cover. The car does have a vortech supercharger kit and shorty headers. These codes popped up right after I put in the new sensors but p1153 has fell off after driving the car a few times but p1133 remains. Is there any chance that I got a bad sensor right out of the box? The new O2 sensors are stock ACDelco replacements and I know people will say to switch bank1 with bank2 and see what will happen but I was just curious if anybody had any input. Any help would be greatly appreciated thank you.

 

You might have gotten a defective one. It does happen.

 

By any chance do you have any other thoughts on this? I did have my scan tool hooked up to the car while I was driving it to check the short-term fuel trims and was thinking that maybe me having the scanner hooked up was interfering with the O2 sensors but then I cleared the codes and only the p1133 is showing up.