Its actually a serious problem in a car. And take my suggestion, don't waste too much time and take your car to the service center as soon as possible. Frankly, I faced the same problem but i was really lazy to take my car to the service center. It all started with absence of coolant in my car. And when I actually took my car to the center, i ended up loosing my pocket. And yes, as Humair advised, don't try to fix it on your own. I tried that, and my hand got burned badly. So my friend, before the exhaust gets completely damaged, take your car to the service center.