This week on Car Talk, Denise's European friend is coming to the U.S., and bringing his Citroen with him. (We don't know if it will fit in the overhead luggage bin, or if he'll have to check it.) He's hoping to drive it from New York to Minnesota, but will the lack of French mechanics and parts leave him uttering, "Mon Dieu!" if he breaks down? Elsewhere, Jann's wondering how to get a dealer to let her test-drive a new car with a 77-pound dog that's prone to car sickness; Keller is preparing to sell his VW Bug, but there's that pesky matter of the missing floor on the passenger side; and Steve's Check Engine light comes on, only when he parks his Civic at the Pentagon. Has his car cracked a classified code? All this, and lots more, this week on Car Talk.