FU: PSA: OBD II dongles draw power when the vehicle is off.

[M A V I C]

I found that, depending on what I'm doing, I need to turn the car off, on then off again after I disconnect my app. Otherwise the ECUs don't completely shutdown when the car is off after certain tasks are run. So it's not the OBDII adapter that does the drain, but the car's ECUs after you've fiddled with them.