Check Engine Light and/or Engine Overheating Due to Failed Thermostat on Audi S4

The thermostat may erratically stick open or closed. The can result in illumination of the Check Engine Light and/or engine overheating.

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Average mileage: 44,556 (12,700–62,000)
8 model years affected: 2004, 2005, 2006, 2007, more2008, 2009, 2010, 2011
15 people reported this problem
6 people shared problem details
2010 Audi S412,700
Car indicated that it was overheating and to stop the engine. Took to dealership under warranty and they've indicated that it was a problem with the thermostat.
2010 Audi S452,000
car ovearheating, loud fan sound.
2011 Audi S440,500
Thermostat on my 2011 Audi S4 failed. It got stuck in the close position and the car overheated. Since it was outside the warrantee, it was a very expensive repair.
2011 Audi S443,254
Thermostat failure, water pump and thermostat replaced. Front part of the engine needs to be torn down to make repair. $$ labor charge.
2010 Audi S451,000
Overheating, warning to shut car off due to low coolant. My coolant is fine and fans are too. Thermostat is the culprit.
2010 Audi S462,000
Front fans come on full blast, AC shuts off. Temp gauge climbs up.
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