Bought a brand new 2013 Honda Civic few days ago and whenever I drive for awhile (20 miles or more) and turn off the engine, a loud clunking noise starts coming from the engine compartment. It goes away after about 5 seconds.

What could this noise be? Do I need to take it to the dealer for repairs or is it normal with Civics?

It would really suck if I bought a lemon!!!!!

 

its brand new, take it in and tell them.