Let's go one further on outside air. I know there has been at least one owner whose air spring was found to have a small hole in it. From what I've read, the system would attempt to maintain the air spring via a closed loop reservoir. Eventually that reservoir would exhaust what reserve it has, so what happens then? Does the whole system shut down with error messages to the EVIC? Just wondering out loud and yes, I know there have been minimal reports of problems, but nothing lasts forever so just putting it out there.This is a screenshot from the WiTech the dealers use. The system is sealed, it doesn't use outside air.
I have a suspicion that techs may be using shop air instead of nitrogen to add to these systems causing problems. Even if the shop runs an air drier, it's still has a bunch of moisture in it compared to nitrogen. There is a refill tool needed to use nitrogen, basically just a pressure regulator.