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DearCustomer- It is illegal to lie on any loan application so you can report this to the lender if you wish. If you file joint tax returns I would presume that you have a copy of last year's filing that you could send to the lender as proof. Whether or not this would help you in a divorce action I have no idea. The fact that he committed fraud in obtaining a loan could cause him some problems but I can't see how it would work to your advantage other than to show that he can't be trusted.
Maybe, depending on what the lender wanted to do. Usually all they care about is selling cars so it's not like a home mortgage.