I think the OBD parasite issue I ran into was because it was a wireless OBD that I left in the port and forgot by mistake. The port is always live and that's how you can take readings from that port with the car turned off. So, if you have a wireless OBD plugged into it, it is always trying to send a signal to a reading device and is drawing constant power... Not a lot of power but I think mine was pulling about 100 millivolts on top of the typical 50-60 millivolts that are being pulled all the time. So when I found the OBD parasite I had forgotten about and pulled it my parasitic draw went back to within the normal range for these cars.