Anna 
2004 Nissan Sentra Sedan 1.8 4dr Sedan (1.8L 4cyl 5M)
Nissan Sentra 2004
 A couple of times the car would just not start after it would sit in the garage for a week or so after a vacation.  There was a constant squeaky noise which the Nissan service guys could not figure out, then later on it turned out that the crank shaft (or whatever) was loose.  Had to replace belt a few times.  I was very disappointed because of these problems, because they all happened within the first 33,000 miles of usage of the car.