Check Engine Light Due to Faulty Torque Converter on Audi S4

A problem with the torque converter can cause the Check Engine Light to illuminate.

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Average mileage: 123,000 (80,000–172,000)
Drive Train affected: Automatic Transmission
10 model years affected: 2000, 2001, 2002, 2004, more2005, 2006, 2007, 2008, 2009, 2010
15 people reported this problem
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2006 Audi S4 - Automatic Transmission 172,000 mi,
I just bought the car several days ago and it was driving beautifully and all of a sudden after the fourth the engine light comes on after i got off the highway but it was driving ok.