One problem related to manifold/header/muffler/tail pipe has been reported for the 2006 Chevrolet Cobalt. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Chevrolet Cobalt based on all problems reported for the 2006 Cobalt.
I purchased a 2006 chevy Cobalt ss w/ 2. 4 liter non-supercharged engine. At about 5,000 miles the car began shaking while braking. I took the car to the dealership and they informed me that the front rotors were delaminated and they machined them down smooth again. This fixed the problem for about another 5-600 miles, then the shaking started again. My car had to go back to the dealer again and they machined them down again without replacing the rotors-they said they just pass inspection. Also, they informed me that the head gasket, the valve covers and the exhaust manifold all needed to be replaced. This is the sixth day they had my car and everyday it is something else they find wrong with it. My car only has 15,000 miles on it and is well taken care of. I feel that the braking power of the car is decreased, even after the rotors are "fixed", I fear I may get into an accident because of this and no one at denoyer Chevrolet on wolf rd in albany, NY tele#518-458-7700 cares. The person that is updating me with information on my car is jeff winne and he is very rude. I hope this matter can be further investigated to prevent any further injury.