The car is less than 6 years old. It's high mileage and has a diagnosed manifold leak and possibly other problems. It was smogged in January, but that's irrelevant now. In good condition at its mileage it's worth around $5,200 per Kelly Blue Book. In fair condition, around $4,300.
Dealers must have this problem every day. They have no idea when a car is traded in if it will pass the smog test, yet they take title. There should be a way to transfer title that allows the buyer to fix the car and get it smogged before registering and operating it.