I have a 2012 ford focus and the rear driver side tire loses air to the point where it's flat when driving at 70mph. The tire never did this before. One day I went on the freeway like I always do and was driving at 70mph, and suddenly I got a low tire pressure warning and about 15 minutes later I stopped at a gas station and the tire was flat. I filled it up with air and drove on it on normal streets (not the freeway) at about 45-55 mph and it didn't lose any air, the car is currently parked and it still hasn't lost any air since then. What could the problem be?
Read more: What causes a tire to lose air only when driving at 70mph?
