Dream about someone taking my car is an indication for your passive aggressive tendencies. You may be trying to fulfill some emotional need. You are trying to avoid confrontation and arguments. The dream is a clue for your lack of sensitivity. Some aspects will not be denied any longer and must be dealt with on a conscious level.
Someone taking my car dream symbolises an aspect of yourself that you need to get rid of. You do not like to deviate from your plans, even if it is monotonous. You may need to get down to the core of a situation before proceeding. This is unfortunately a warning for underdeveloped emotions. You will hold your own ground and overcome minor difficulties and problems.
If you dreamt about someone taking my car:
Your natural impulse is to bring conflicting people or issues into some kind of harmonious agreement, as disagreement is something you find hard to stomach. You just need to take the first step.