The 4th generation of Jettas was the most popular model, and is probably the most popular used Jetta wagon today. Its popularity was due to an improved appearance and the inclusion of full length side air bags. The 4th generation Jetta wagon, which was manufactured from 2001-2005, is generally considered to be a good buy in the used car market if it has a clean service record. Checking a car history through CARFAX or AutoCheck is a good idea. Though, whenever you are looking into a used car purchase. This generation of Jettas was sold from 1999-2005 as a sedan, and the sedan version is considered to be among the most popular used Jettas, as well.