A car that breaks down on the way is read as a plan or a body of effort that has stalled. It is often linked to tiredness and a need to stop and tend to what carries you.
Has this come up in your dreams before? What was going on in your life then?
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.