Having trouble burning a cd (not a newb, what so ever)?

sup guys. ive been burning for years but up until maybe a week ago i would try to burn a cd. i use limewire to download the songs and windows media burns them for me. i use high quality sony discs but for some reason they wont' play in my vehicle's cd player?? i dont kno why i always play burned cd's in it. all the time. and sumtimes i'll burn a cd and then try to play it else where, but it will appear to not have the data on it? whats up with this thing.