One of the reason I’m able to flip for other cars of higher value than mine is that the cars I’m trying to get have some issue that current owner doesn’t want to deal with. It could be a costly fix or maybe the registration tags are coming up and a required smog cycle is due. This is where I come in, I fairly good at smog, electrical, climate controller issues. These are the achilles heel for a lot of folks and at some point they don’t want to deal with their troublesome car.
This is the reading I was getting when I did a OBD2 scan.
After replacing Bank 2, Sensor 1 02 sensor and doing a reset the monitors required reset after going through the GM specific drive cycles.