My 2006 A3 thermostat works on and off. At times, thermostat gauge doesn't move at all. I am thinking thermostat sensor or faulty thermostat. As anyone come accross this? Is thermostat replacement something than can be done as DIY? any advice is appreciated.

 

I am having the same problem myself is your engine light on by any chance ?

 

You'll need to replace it with one of these... Audi A3 FWD 2.0T > Search > Thermostat > ES#252671 Thermostat - 06F121111F

I've got the same problem at the moment, some dyas its working, some days it's not. It also a real PITA to replace.

 

I am not sure about this but you might want to try calling an Audi dealership and ask for updates. Im almost sure that there is one for the thermostat.