My RS6 showed a yellow check engine light a month or so ago and, at the same time, I noticed that the fan(s) would run for several minutes after I shut of the car, even if the car had barely been driven. I also smelled some strong exhaust odor and the smell of gasoline. I took the car to the dealer and they said they couldn't find anything wrong with the car and the check engine light had gone out. Now, a month or so later, the car is doing it again...yellow check engine light and fan(s) running for many minutes after shutting off the car. I do not have the exhaust or gas smell this time though. Has anyone ever experienced these set of symptoms before? I am going to take the car back to the dealer but wanted to have as much information as I can before I take it.