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: 46,545 (12,700–65,000)
8 model years affected: 2004, 2005, 2006, 2007, more2008, 2009, 2010, 2011
18 people reported this problem
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problem details
2010 Audi S4 12,700 mi,
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 S4 65,000 mi,
Usual plastic bs thermostat on the new 3.0L engines snapping and getting stuck in closed position. Audi replaced it after fighting with AOA about it, since it's a common failure and they refuse to make a proper metal thermostat that won't just snap off because it's plastic and brittle after being in hot coolant for thousands of miles.
2010 Audi S4 44,000 mi,
Driving normally and warning light came on. Well maintained, dealer certified car that was purchased as CPO and I'm glad I was covered under warranty. Dealer said its a common problem and knew exactly what was up. Also replaced my fans but I didn't know why the fans broke down. Cost me only $75 because I was covered.
2010 Audi S4 52,000 mi,
car ovearheating, loud fan sound.
2011 Audi S4 40,500 mi,
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 S4 43,254 mi,
Thermostat failure, water pump and thermostat replaced. Front part of the engine needs to be torn down to make repair. $$ labor charge.
2010 Audi S4 51,000 mi,
Overheating, warning to shut car off due to low coolant. My coolant is fine and fans are too. Thermostat is the culprit.
2010 Audi S4 62,000 mi,
Front fans come on full blast, AC shuts off. Temp gauge climbs up.