I own a 06 A4Q 2.0t. 40,000miles. Its been to the dealer for some sensor I dont even remember for 12 days, valve cover gasket for 4 days, vibration in the front end, (all new motor mounts) 12 days, 2 other visits for the vibration, but still a problem. Vibrates in the steering wheel and lower panels and seats. Brand new tires, stock rims, balanced 3 times to ensure they were right. But still vibrates. I dont know what to do. Still under factory warrenty. Is it a lemon? I would really appriciate any advice.