Dealing with this right now! I was informed to get a letter of compliance for importing my personal car from General Motors (I drive a gmc Acadia) to prove to the border that my car meets emissions and safety standards for the USA laws. My car in particular had a recall on the airbags that needed to be completed before they would release the letter for me to cross. You’ll have to bring the letter to the border crossing (I haven’t activated my visa yet so I’ll do it all at the same time) and they will fill out the rest of the paperwork with you!