Of course, the thing to do is bring it to a competent mechanic for a diagnosis - which is what your husband SHOULD HAVE done before shelling out seven grand on a used car sold "as is".
Then tell them to your attorney.
If you have been charged criminally you should not be talking about your case on the Internet - you need professional legal counsel.
No one here can predict what will happen or answer your questions.
I'm constantly amazed at people who HAVE ATTORNEYS and yet choose to ignore that fact and go asking a bunch of strangers on the Internet questions that they cannot possibly answer.
ASK YOUR ATTORNEY.
If you don't like him then...