I just bought a 06 gto A4 about 3 weeks ago.This morning all of the sudden computer screen started flashing and making a warning sound. It said traction control off, engine in reduced power mode. The car would barely go. Thank God I was close to home. It barely had enough power to make it into my driveway and sounded like it was running on on one or two cylinders. It shut off and now will not crank. It will not even turn over! Check engine light is on! Thank God I am still under carmax 30 day warranty. I also bought extended warranty. I guess that was a good decision. Car has 74K on it and has run awesome until this happened. Any ideas?