I have a 2007 Audi A4 sedan. One day, while I was driving, the warning light Low Oil Pressure flashed on. I thought maybe I needed oil. I checked it and added a quart. The next morning after driving a couple of miles, it came back on. So, I drove it back to the house. It didn't make it. It shut off and warning beeps started sounding off. What is the problem. Never experienced this before.