What plastic access port for the drain plug? Are you referring to this?
I believe that is a vent for the PTU. There are no removal oil drain plug access panels in the stock FX4 skid plate.
Repair shops already exist that can perform repairs poorly and use aftermarket components, either of which might lead to an accident. The manufacturer of the vehicle is not liable for such actions.
That legal protection exists in the fact that they are not responsible.
Agree with this. The way to get rid of that error is to keep a running total of both miles traveled and fuel added to the tank. It doesn't matter if it's full or not. The more readings you get, the less the error.
Keep two columns (spreadsheet makes it easy) one labeled "Miles Traveled Since...