Well, I have over 16,000 miles on it now, and about a week and a half ago my engine light came on. I brought it into the dealership and they replaced some sensor in the engine. Well, 3 days ago, the light came on again. Onstar ran a diagnostic check and found that I am having combustion problems. It is now in the dealership again, so hopefully it will be fixed....I am driving a Enterprise grand prix as a loaner....nothing like the good ol' HHR