A stolen car in most cases denotes that you are going to face identity related problems in the future.
It may be personal or related to your profession, but you may be affected in your personality. It may affect your reputation, the trust someone has in you, a close affectionate relationship, a finance based foundation, an employment related negotiation or an expenses related issues.
As a conclusion, a stolen car symbolizes something negative or unfavorable regarding your life.
But, if you think and act wisely, there is every reason that you will have the solutions for your problems. Sweet dreams!