I was recently trying to swap my exhaust but after a figment issue I had to put the old one back on. I have an air due ration gauge that worked fine until I put the exhaust back on and now it sits at 14.8 and never moves. I unplugged the o2 sensor obviously when I took the pipes out but it never cracked loose. It’s plugged in tight but now the car stalls out a little while warming up (when it’s almost warm it’ll kinda just die unless I tap the gas every now and then but it just warmed up fully and seems fine now). I don’t have a check engine light though it was flashing here and there before but the lights not on. The exhaust isn’t perfectly fitted in the rear more so I don’t think that would do it, I’m just using it until I get new headers for my new exhaust. I fee like I need to reset something or have it relearn the sensor somehow