The worst problem I faced in my car was the fuel pump issue. The life of the fuel pump of my car almost died, and without caring about it, I use to travel on highway. And because of the fuel pump issue, my car use to stop in the middle of the road and it was really difficult for me to ignite it again. My faced lot of problems because of that. And I suppose it happened because I did not give my car for servicing for more than 7 months. When I got stuck at the highway, somehow I managed to drive back to the city and first thing I did was to give my car for servicing. And I learned that its really important to maintain your car otherwise your car can even ditch you at the highway.