what recourse can be taken against a preditory lender in regards to automobile financing.

It depends on the particular kind of misconduct in which the lender has engaged. If the conduct in question is authorized by law, you may have a difficult time obtaining a legal remedy, regardless of the characterization of the lender as "predatory." An attorney may be able to discuss this situation with you. Specific facts are required. You should not discuss them in a public forum.