Obd2 reader not reading trouble codes
A couple days ago I got a check engine light so I read them with my obd2 reader. It said there was a misfire and a couple o2 sensor errors. So checked the spark plugs and ignition coils and filled up with better gas. Then I also checked the upper o2 sensor. Unplugged it and tested power. All seemed fine. Plugged back in cleared the codes. All was fine for a week then got check engine light back on today. Tried to check engine codes again and it won’t load them! Does it have something to do with unplugging thre o2 sensor?