The front crash mitigation system called Audi presence does not work on my car. I bought an Audi certified preowned vehicle that was supposed to have original windshield to find out 6 months after I own car that windshield was replaced and presence does not work. This is a required safety system in my car and will cost 1700 to repair. Audi of America refuses to fix this under warranty despite this being a faulty system. They will not even return my calls or emails. The presence system stops the car so an accident does not occur.

- Wheaton, IL, USA

This is a tire complaint about Continental contiprocontact 245/40/R18 79H tires. Audi prestige A4 was purchased from dealer, fletcher jones Audi in Chicago, on 12/29/17. It had been a dealer demonstrator and had very low mileage. It is used mostly for city low speed driving. On 4/25/18 all 4 tires had multiple bubbles in sidewalls and required replacement. New tires with warranty were purchased from dealer. On 7/6/18 one tire was replaced under warranty. On 1/18/19 one tire was replaced with bubbles. On 3/24/19 3 tires were replaced with multiple bubbles in sidewalls. On 4/24/19 another tire was replaced with bubbles in sidewall. As a scientist I have difficulty believing that this is just bad luck. This looks to me like poor engineering or a manufacturing defect. My tires were covered under warranty, and to this point my personal expense has been low. We have not had an actual blowout or accident. Nevertheless, I have safety concerns for myself and the general public. There must be something defective in these tires -- and before another person gets injured or killed from a blowout

- Chicago, IL, USA

While driving 35 mph on a well-paved roadway, my sunroof exploded. I was not hit by a rock or anything else. The only sound I heard was the pop when the explosion happened. Thankfully, my sun shade was closed and the glass did not enter the vehicle.

- Westwood, MA, USA

I had two tire side wall defects that resulted in "ballooning" of the side of the tire. The tires are pirelli 245/40/ R-18. The car has 12,500 miles only. I found out the first big balloon at home and next day noticed the second one smaller but growing.

- Burien, WA, USA

After parking my car, my daughter, the passenger in the right back seat, opened the door to get out of the car. She suddenly felt acute pain on the top of her foot and saw blood gushing out of it. I went to her side of the car and saw an avulsion of the skin on the top right of the foot, and blood all over the floor of the car and the door. A sharp piece of metal trim labeled "bang & olufson" (see photo) had semi-detached from the door panel and lacerated her foot, piercing through her foot and coming out between her toes. This metal trim piece looked like a sharp knife blade, and had come out of its glued spot on the door, sticking out at a 25-30 degree angle. I put pressure on the wound and removed the piece from the car to prevent further injury, cutting myself in the process. It was covered with blood. I immediately drove her to the er at mercy hospital. Dr. miller, a plastic surgeon, spent 2 hours cleaning the wound, pulling the flayed skin back to its original position, and stitching tendons and blood vessels that were affected in the injury. He placed continuous absorbable sutures the length of the wound. (see photo) she was discharged with orders not to walk or put any weight on the foot, except to go to the bathroom, for at least 3 weeks. The doctor told her she may lose the skin on the foot and may have to receive skin grafts to repair the wound. My daughter was in excruciating pain and it is still unknown whether she will have permanent scarring or pain, or if she will regain full functioning of the foot. She has undergone a course of antibiotics and remained on bed rest for 30 days since the incident. The sharp metal blade was only glued on the door surface, with no screws to attach it to the door. This is what appeared to cause this blade to detach from the door and stab into my daughter's foot.

- Miami, FL, USA

While driving on san mateo bridge around 5pm the sun roof suddenly exploded with a huge bang sound. The car was moving at about 70 mph.

- Fremont, CA, USA

I was driving on the highway in rainy conditions. (driving according to speed limit) and I suddenly lost control. The car wouldn't turn when I turned the wheel and started veering out of the lane. It then turned into the opposite direction into traffic and eventually spun to a stop.

- Burlington, MA, USA