First, this may or may not be a fraud case. It could just be a breach of contract or breach of warranty case. To prevail on any type of case, you will have to show that the mechanic did not repair the car correctly. That will take an expert. You should call Hyung Choi 480.517.1400. He can help you understand where you are and what you need to do.
The information provided should not be considered legal advice. I am not licensed to practice in any State other than SC. The results of your case will depend on the presentation of evidence, the law and other factors that may change depending on an in depth analysis of the facts of the case. Please see an attorney before making legal decisions.