Was driving home tonight and noticed that I was bouncing down the road, when the STOP FAULT RUNNING GEAR appeared, and I pulled over. I turned the vehicle off, then let it sit, then restarted and continued to drive and everything seemed OK, then the error came up again, and when I got home a few minutes later, I noticed the rear of my car was LOW. I did a VAGCOM and P0100 and 01772 came up. Should I not drive my vehicle? Not sure what to do and worried that the cost to fix will be $$$$$.