Driving home from work, all of a sudden my vehicle was revving while it was idle and at low speed, making it very difficult and dangerous to steer the car and keep it under control. Upon inspection, it was found that the timing chain tensioner had failed and had caused serious engine damage, causing the pistons to fire prematurely. Previously the tensioner was replaced in 2014 by Audi when the car had ~50K miles and was reported as a "weak tensioner". my car currently has 92K miles. I believe that no replacement tensioner should only last 40K miles and cause catastrophic engine failure and put consumers at risk of not being able to control their cars.

- Nashville, TN, USA

I was just parking the car and was about 5 mph and suddenly car got accelerated unintentionally to higher RPM and hit the curb and above cement wall. Even applying brakes hadn't slowed down the vehicle because it was just few feet away.

- Nashua, NH, USA

On two occasions, April 3, 2012 and April 9, 2012, while traveling with the cruise control set at 78 mph, without touching the control or accelerator, the control setting jumped to 90 mph and the vehicle began to rapidly accelerate. When the brake was applied, the cruise control disengaged.

- Baton Rouge, LA, USA