One problem related to sway bar has been reported for the 2009 Chevrolet Impala. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Chevrolet Impala based on all problems reported for the 2009 Impala.
There appears to be many issues related to brakes and suspension for the chevy Impala. After only 10k miles, the brakes began to pulsate. The dealership resurfaced them. They were fine for a bit longer but then the issue reoccured. I am not sure if its a overheating issue or what but it has had other brake and suspension issues as well. There is under 30k miles on the car and it has already had: left front tensioner replaced, rear left sway bar removed/reinstalled, rotors refinish, and a whole new set of tires now. We have had many other gm vehicles over the years from both chevy and Buick. No other vehicle has given us as many issues in such a short period of ownership that this car has. It all appears to be related to the brakes and suspension. Based on online searches, we are not alone as many Impala owners have had similar brake related issues/complaints.