Check Engine Light and/or Engine Overheating Due to Failed Thermostat on Audi A6 Quattro

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: 87,221 (44,250–120,500)
Engines affected: 3.0L V6, 3.2L V6, 4.2L V8
8 model years affected: 2004, 2005, 2006, 2007, more2008, 2009, 2010, 2011
17 people reported this problem
7 people shared problem details
2009 Audi A6 Quattro- 3.0L V679,587
Just starting to hear odd..humming noise on and off. The temperature gauge will move beyond 1/2 mark..and move up to H mark..and say " turn engine off Immediately". Some days its okay, other days its not. Pump failing and/or thermostat sticking. I cant think of anything else.
2011 Audi A6 Quattro- 3.0L V644,250
Replaced by dealership. Hefty price: $1500. Not covered by extended warranty!!!
overheating and drive bad sometime white smoke come from the tail pipe.
2010 Audi A6 Quattro- 3.0L V687,000
Thermostat is faulty. Was replaced three years ago as part of a factory recall. Problem has resurfaced. Cost is ~ $1,000 because thermostat is located beneath the supercharger and replacement is "labor intensive."
2009 Audi A6 Quattro- 3.0L V647,103
While driving the thermostat sign appeared on my dashboard and smoke started to be seen on my hood. Had to park and have it towed to the nearest Audi dealer. The following day the dealer replaced a failing thermostat free of charge covered by my warranty. Just a hassle getting the fixed in between work.
Not overheating, yet... engine light on... shop says need new thermostat...$940 because so labor intensive. Help!!
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