This is the second time this has happened in similar circumstances in the last two years to my wife. The temperature was under 4 degrees and extremely windy and snowing. She warmed the car up for 15 minutes before driving it. The engine temperature gauge was a little bit off cold. The heat was on and working fine. The car did not want to go, and hesitated during acceleration. She drove a mile to the interstate with no issues and the car warmed up. Once on the interstate, she drove about a half mile accelerating to about 65. When she tried to pass, and began accelerating the throttle froze. The rpms increased quickly and significantly. She tried to brake, but the brake pedal was not effective. She downshifted using the tiptronic, the car went faster. She put it into neutral and the rpms revved out. The car approximately was going 90 miles an hour or greater at the apex of my speed. She got off the interstate by using my E-brake, and turned the car off at the stop light because she feared it would not stay stopped. She drove about a half mile to work using the E-brake and brake to slow down, and nearly hit a tree trying to stop. She turned the car on again after she parked to see if the throttle was still stuck, it was. Three hours later I arrived, started the car, and the throttle was no longer stuck. I called the dealer that day, explained the issue, and they wouldn't take the car until 6 days later. They told us that it was the car mat stuck under the pedals, and it was necessary to keep the appointment. I took the car to get looked at anyway, they inspected to find egr valve clogged causing moisture buildup and throttle to ice over. They replaced the egr valve, air pump and vacuum hose and cleaned the throttle body. This totaled $546.30. There is a recall on the A6 throttle body for the same year, engine, transmission and the exact same part number! but Audi corporate told us it did not apply because we have the A4 not the A6 and was not concerned or willing to help.

- Clifton Park, NY, USA