Today while driving ~65-70mph, 5th gear, kind of noticed/felt a roughness and maybe a slight change in exhaust rumble...then RED warning triangle lights and flashes 3-4 times accompanied with chime, then stops. Everything was fine rest of the way home...(maybe 4-5 miles of varying speeds and gear changes). Is there any way that I can check a "code" from the car or do I need to have it hooked up to the diagnostic at the dealership?? I am getting ready to drive this thing to Arizona in a couple weeks and need her in top condition!! (4400 miles on car)

 

You can check the codes if you have a scan tool. Just plug it into the OBD port. But since your car is still under warranty, I'd take it to the dealership and see if they find anything that needs to be addressed.