My trusted mechanic indicated that on other forum discussions yrs 2000 & 2001 had problems with the NAV and that is why it was changed in yr 2002. The dealer has acknowledged that software upgrades helped these problems and that mine is different. The real question may be and you may have answered it....is it rare to have the computer malfuntion completely? Or is this computer malfuntion a common occurence in my model and yr?