Not finding where you parked is read as losing track of your own direction or drive. Dream books link it to a period of distraction or to feeling cut off from what moves you forward.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.