Should I contact the dealer if I feel that a car salesman committed fraud when I bought a car?

You may be required to do so. In many states, you (or your attorney) must contact the auto dealer and give them an opportunity to correct the problem to your satisfaction, before taking any legal action for possible auto dealer fraud. This contact should be in writing, and should clearly illustrate both the problem (i.e. the dealer’s failure to disclose certain financing charges), and what steps you would like the dealer to take to resolve the problem (i.e. a partial refund of the vehicle purchase price).