A cracked exhaust manifold can cause an exhaust leak. This is extremely dangerous! Anyone inside the car can start getting carbon monoxide poisoning without knowing it. You should always stay on top of this specific part of the car; make sure it's working properly. Because carbon monoxide is odorless and colorless, making it even that much more hazardous. Some things to look for include smoke
. coming out of the engine and a loud sound. Now, if you bought your car after 1996, the Check Engine light will also notify you when there's a crack in the exhaust manifold.
