A dealer or an agent or employee of a dealer may not permit any individual to road test a motor vehicle if he knows that the other individual does not have a license to drive of the appropriate class. A dealer or an agent or employee of a dealer may not make any material misrepresentation in obtaining a vehicle sales contract. A dealer or an agent or employee of a dealer may not commit any fraud in the execution of or any material alteration of a contract, power of attorney, or other document incident to a sales transaction. A dealer or an agent or employee of a dealer may not prepare or accept any promissory note or other evidence of indebtedness on a vehicle sales contract knowing that it requires the debtor to pay an amount greater than that agreed on in the written contract for the sale of the vehicle. A dealer or an agent or employee of a dealer may not willfully fail to perform, without justification, any vehicle sales contract. A dealer or an agent or employee of a dealer may not materially deviate from or disregard, without the consent of the buyer, any of the original terms of the contract. A dealer or an agent or employee of a dealer may not willfully fail to comply with the terms of a warranty or guarantee. A dealer or an agent or employee of a dealer may not rent a dealer registration plate issued by the Administration. A person convicted of a violation of this section is subject to imprisonment not exceeding 2 months or a fine not exceeding $500 or both.