JNguyen_TTS09

It has probably been a week now since I noticed my temperature gauge stays at cold the entire time. It doesn't rise at all, even when the engine is definitely warmed up from driving. This issue happened all of a sudden, the day before it happened it was working perfectly fine. I check the oil temperature on the digital menu and oil temperature is normal. I also don't have a check engine light on or any other lights on, but can it still be a sensor? It's an '09 TTS that just hit 40k miles. Does anyone know what it could be? I really hope it's not the instrument cluster because I heard they're expensive.

JNguyen_TTS09

Bump

BSullivan

Wife had the same problem in her TT. Turned out to be the temp sensor failed and the thermostat had stuck open. I had not expected both failures at once. Had dealer replace and all is well.

JNguyen_TTS09

I ordered a new sensor which should be here by Wednesday. My check engine light also recently turned on which indicated a P2181 fault code which is "cooling system performance". My uncles who are mechanics checked the car and determined that it's the sensor that's bad since the car isn't overheating, no coolant leaks, and fans are working fine. Hopefully when they change the sensor all will be well again. I do have one question though, how much did the dealer charge to do the thermostat if you paid out of pocket? I got a quote from a shop that specializes in European cars for $400, does that seem about right?

JNguyen_TTS09

My sensor that I had ordered from Amazon did the trick! Replaced the old sensor and cleared the code, next thing you know the sensor moves straight to the middle like it's supposed to.

JNguyen_TTS09

Looks like I'm going to have to replace the thermostat as well afterall. This morning when I got to work I noticed my temperature gauge stay on cold again. Kind of a bummer since its only been 4 days since the coolant temperature sensor replacement, but at least I know that is has to be the thermostat... I'm going go call Audi and see how much they charge, if not I might bring it to a shop that specializes on European vehicles that previously quoted me $400 for the whole thermostat job. Sound reasonable?

BSullivan

Been busy but in my wife's case, the car was still under warranty. No out of pocket cost. It is interesting that sensors and thermostats tend to fail at the same time