This is one of the most commonly reported recurring dreams, and it has a fairly consistent, reassuring interpretation: since a car represents personal direction and momentum, not being able to find it reflects a temporary, usually minor, loss of a clear sense of direction.
Wandering a car park unable to remember where you parked
The classic version of this dream — this usually appears during ordinary periods of mild overwhelm or distraction, not major life crises. It's less "I've lost my way in life" and more "I have too many small things on my mind right now to feel oriented."
Finding your car has been moved or stolen
A slightly more anxious version, this can reflect a sense that your usual sense of direction has been disrupted by something outside your control — a change in plans or circumstances you didn't choose.
Finding the wrong car that looks similar
Can point to pursuing a direction that seemed right at first but, on closer inspection, isn't actually yours — worth checking if a recent decision felt initially right but increasingly off on reflection.