This happened once on the highway. The car just lost power. I had to cross over several lanes of traffic.. luckily no one was too close to me.

Then yesterday I came upon a stoplight in town and it just died.. battery light and oil can light came on. Luckily I was on a small incline so I was able to coast backwards to the safety of the shoulder.

My mechanic had taken it home to see if it would do it again.. drove it back to the shop the next morning. All is fine. But it isn't. When will this happened again. Why doesn't this show up on any of the diagnosis? My battery is new. What is wrong with my car?!